JP2013110727A - Radio communication system, radio terminal device, communication control method and communication control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system, radio terminal device, a communication control method and a communication control program, capable of obtaining stable communication by detecting an inappropriate handover operation.SOLUTION: The radio communication system determines an inappropriate transfer operation by a radio terminal device 202 or adjusts transfer operation timing by the radio terminal device, on the basis of base station identification information of a radio base station device 101, the coincidence of terminal identification information, which is added to the radio terminal device 202 from the radio base station device 101, with identification information proper to the radio terminal device 202, and the residence time of the radio terminal device 202.

Description

  The present invention relates to a radio communication system, a radio terminal device, a communication control method, and a communication control program, and in particular, a radio communication system in a communication system in which a radio terminal device can communicate with a plurality of radio base station devices by performing a moving operation, The present invention relates to a wireless terminal device, a communication control method, and a communication control program.

  Conventionally, in a mobile communication system, a communication service is provided by a radio base station apparatus (hereinafter also referred to as a macro base station) that forms an area in which a cell having a radius of several hundred meters to several tens of kilometers, that is, a radio terminal apparatus can communicate. It was.

  In recent years, due to a dramatic increase in the number of subscribers of mobile communication services and an increase in the amount of communication traffic due to data communication, subscribers and communication traffic are distributed by forming smaller radius cells, and a certain level of communication It is desirable to provide speed to users in a stable manner. In addition, in order to deal with dead zones associated with the increase in the number of buildings, it is desired to install radio base station devices on the corporate floor and in ordinary households.

  Together with these demands, the processing capability of various devices used in the radio base station apparatus has been dramatically improved, and the miniaturization of the radio base station apparatus has progressed. Collecting.

  Since the radius of the femto cell (Femto Cell) formed by this small base station (hereinafter also referred to as a femto base station) is as small as about 10 meters, the femto base station is the macro cell (Macro Cell) formed by the macro base station. It may be used in places such as indoors and underground malls where it is out of service area and it is difficult to install macro base stations.

  In addition, since many femto base stations are installed in a specific area, it is difficult to connect the femto base stations directly to the core network. For this reason, it is conceivable that a large number of femto base stations installed in a specific area are once connected to a gateway device such as a HeNB-GW, and the femto base station and the core network are connected via the HeNB-GW.

  In addition to the femto base station, a pico base station that forms a pico cell having a radius of 100 to 200 meters, for example, has been developed based on a macro base station.

  In a heterogeneous network that is a communication system in which such femto base stations, pico base stations, and macro base stations are mixed, for example, a plurality of femto cells or pico cells are formed in a macro cell. For this reason, handover of a radio terminal device is likely to occur, and the situation of handover is complicated, so that an inappropriate handover operation is performed such as the timing of handover being too early or too late (For example, see 3GPP TR 36.902 V9.3.1 2011.3 (Non-Patent Document 1)).

3GPP TR 36.902 V9.3.1 2011.3

  When an inappropriate handover operation as described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system. A technique for suppressing such an inappropriate handover operation and constructing a good communication system is desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless communication system, a wireless terminal device, and a wireless terminal device capable of stabilizing communication by detecting an inappropriate handover operation. A communication control method and a communication control program are provided.

  (1) In order to solve the above-described problem, a wireless communication system according to an aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the wireless terminal device performs a handover operation as described above. A wireless communication system capable of communicating with a plurality of wireless base station devices, wherein the wireless base station device gives terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal device Among the plurality of radio base station apparatuses, when performing a handover operation from the first radio base station apparatus to the second radio base station apparatus, the base station identification information of the first radio base station apparatus, and the first Terminal identification information given from one radio base station apparatus is held, and the radio terminal apparatus newly communicates with the radio base station apparatus after the handover operation to the second radio base station apparatus is completed. To when performing handover operation in the case or to the newly wireless base station device resumes the held the base station identification information and the terminal identification information is notified to the wireless base station apparatus.

  With such a configuration, the first radio base station apparatus that has established a communication connection two times before the radio terminal apparatus that caused an inappropriate handover operation has established a communication connection with itself. It is possible to identify which radio terminal apparatus has a problem in the handover operation among the existing radio terminal apparatuses. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (2) Preferably, even when the handover operation of the wireless terminal device that selects itself as a communication destination to the second wireless base station device is completed, the first wireless base station device completes the wireless terminal device. The terminal identification information given to the is held.

  With such a configuration, the first radio base station apparatus can easily collate the terminal identification information provided by itself with the terminal identification information notified by the radio terminal apparatus.

  (3) More preferably, the first radio base station apparatus further holds a type of a handover operation from itself to the second radio base station apparatus by the radio terminal apparatus.

  With such a configuration, the first radio base station apparatus can easily recognize the type of the handover operation in which there is a problem. Processing can be performed more appropriately. Further, since the type of handover operation is held in the radio terminal apparatus and it is not necessary to notify the radio base station apparatus, the configuration and processing of the radio terminal apparatus can be simplified.

  (4) More preferably, the first radio base station apparatus further moves the radio terminal apparatus when a handover operation from the radio terminal apparatus to the second radio base station apparatus is performed. Hold speed.

  With such a configuration, the first wireless base station device can easily recognize the moving speed of the wireless terminal device during the problematic handover operation, and therefore analyzes the inappropriate handover operation in more detail. In addition, the optimization process of the handover operation can be performed more appropriately. In addition, since the wireless terminal device does not need to maintain the moving speed and notify the wireless base station device, the configuration and processing of the wireless terminal device can be simplified.

  (5) Preferably, when performing the handover operation from the first radio base station device to the second radio base station device, the radio terminal device further holds the type of the handover operation, When the wireless terminal device resumes communication with the radio base station device after the completion of the handover operation to the second radio base station device or performs a new handover operation to the radio base station device, Further, the type of the held handover operation is notified to the radio base station apparatus.

  With such a configuration, the first radio base station apparatus can easily recognize the type of the handover operation in which there is a problem. Processing can be performed more appropriately. In addition, since it is not necessary to hold the type of handover operation in the radio base station apparatus, the configuration and processing of the radio base station apparatus can be simplified.

  (6) Preferably, when performing the handover operation from the first radio base station apparatus to the second radio base station apparatus, the radio terminal apparatus further performs self-handling when the handover operation is performed. The wireless terminal device may resume communication with the wireless base station device after completion of the handover operation to the second wireless base station device or newly to the wireless base station device. Further, when the handover operation is performed, the mobile base station apparatus is notified of the held moving speed.

  With such a configuration, the first wireless base station device can easily recognize the moving speed of the wireless terminal device during the problematic handover operation, and therefore analyzes the inappropriate handover operation in more detail. In addition, the optimization process of the handover operation can be performed more appropriately. Further, since it is not necessary to maintain the moving speed in the radio base station apparatus, the configuration and processing of the radio base station apparatus can be simplified.

  (7) A radio communication system according to another aspect of the present invention includes a radio terminal device and a plurality of radio base station devices, and the plurality of radio base station devices when the radio terminal device performs a handover operation. The wireless terminal device can perform a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The type of the handover operation is retained, and the wireless terminal device newly restarts communication with the wireless base station device after completion of the handover operation to the second wireless base station device or When performing a handover operation to the station device, the type of the held handover operation is notified to the radio base station device.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (8) Preferably, the first radio base station apparatus performs the handover operation even when the handover operation of the radio terminal apparatus selecting itself as a communication destination to the second radio base station apparatus is completed. Holds the type.

  With such a configuration, in the first radio base station apparatus, it is possible to easily perform a comparison between the type of handover operation that the mobile terminal apparatus has made a determination of in the past and the type of handover operation notified by the radio terminal apparatus.

  (9) Preferably, when the radio terminal apparatus performs a handover operation from the first radio base station apparatus to the second radio base station apparatus, the base station of the first radio base station apparatus Station identification information is held, and when the wireless terminal device newly resumes communication with the wireless base station device after completion of the handover operation to the second wireless base station device, or newly to the wireless base station device When the handover operation is performed, the stored base station identification information is further notified to the radio base station apparatus.

  With such a configuration, in the first radio base station apparatus, it is possible to further easily compare the type of handover operation that the mobile terminal apparatus has determined to execute in the past with the type of handover operation notified by the radio terminal apparatus. .

  (10) A radio communication system according to another aspect of the present invention includes a radio terminal device and a plurality of radio base station devices, and the radio terminal devices perform a handover operation to perform the plurality of radio base station devices. The wireless terminal device can perform a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The mobile terminal device maintains its own moving speed when the handover operation is performed, and the wireless terminal device newly communicates with the wireless base station device after the handover operation to the second wireless base station device is completed. When resuming or when performing a new handover operation to the radio base station apparatus, the mobile base station apparatus is notified of the held moving speed.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (11) Preferably, the first radio base station apparatus performs the handover operation even when the handover operation of the radio terminal apparatus that selects itself as the communication destination to the second radio base station apparatus is completed. The moving speed of the wireless terminal device when performed is maintained.

  With such a configuration, in the first radio base station apparatus, it is easy to collate the movement speed of the radio terminal apparatus and the movement speed notified by the radio terminal apparatus at the time of the handover operation in which the self has determined execution in the past. Therefore, it is possible to easily recognize the type of handover operation that has a problem.

  (12) Preferably, when the wireless terminal device performs a handover operation from the first wireless base station device to the second wireless base station device, the base station of the first wireless base station device further Station identification information is held, and when the wireless terminal device newly resumes communication with the wireless base station device after completion of the handover operation to the second wireless base station device, or newly to the wireless base station device When the handover operation is performed, the stored base station identification information is further notified to the radio base station apparatus.

  With such a configuration, the first radio base station apparatus can further easily collate the movement speed of the radio terminal apparatus and the movement speed notified by the radio terminal apparatus during the handover operation in which the self-execution determination has been made in the past. Therefore, it is possible to more easily recognize the type of handover operation that has a problem.

  (13) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless base station device provides terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal device includes the plurality of wireless base station devices. Of the first radio base station apparatus and the first radio base station apparatus when performing a moving operation from the first radio base station apparatus to the second radio base station apparatus. The first radio base station apparatus holds the terminal identification information given by the mobile station from the timing of the moving operation of the radio terminal apparatus selected as the communication destination to the second radio base station apparatus. When When the wireless terminal device resumes communication with the wireless base station device after completion of the moving operation to the second wireless base station device, or the mobile terminal device newly moves to the wireless base station device. When the base station identification information and the terminal identification information held is notified to the radio base station device, the first radio base station device receives the notification from the radio terminal device, The base station identification information notified from the wireless terminal device matches its own identification information, the terminal identification information notified from the wireless terminal device matches the terminal identification information given by itself, and If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or Wireless terminal equipment By adjusting the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (14) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless base station device provides terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal device includes the plurality of wireless base station devices. Of the first radio base station apparatus and the first radio base station apparatus when performing a moving operation from the first radio base station apparatus to the second radio base station apparatus. The first radio base station apparatus holds the terminal identification information given by the mobile station from the timing of the moving operation of the radio terminal apparatus selected as the communication destination to the second radio base station apparatus. When When the wireless terminal device resumes communication with the wireless base station device after completion of the moving operation to the second wireless base station device, or the mobile terminal device newly moves to the wireless base station device. And when the held base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, the held terminal Identification information is notified to the radio base station apparatus, and the first radio base station apparatus receives the notification from the radio terminal apparatus, and the terminal identification information notified from the radio terminal apparatus When the given terminal identification information matches and the elapsed time is less than a predetermined value, the wireless terminal device moves from the first wireless base station device to the second wireless base station device. Is inappropriate Judging that either or to adjust the timing of the movement operation from the wireless terminal device according to the first radio base station apparatus to the second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted.

  (15) Preferably, even if the first radio base station apparatus completes the moving operation of the radio terminal apparatus selecting itself as a communication destination to the second radio base station apparatus, the radio terminal apparatus The terminal identification information given to the terminal is held, and the terminal identification information is erased when the elapsed time exceeds the predetermined value.

  With such a configuration, the radio base station apparatus can appropriately hold and release the identification information given to the radio terminal apparatus.

  (16) Preferably, the radio terminal apparatus notifies the radio base station apparatus of the base station identification information and the terminal identification information, or timing of a movement operation of the radio terminal apparatus to the second radio base station apparatus. After a predetermined time elapses, the stored base station identification information and terminal identification information are deleted.

  With such a configuration, the wireless terminal device can release the identification information of the wireless base station device and the identification information given from the wireless base station device at an appropriate timing.

  (17) Preferably, the wireless terminal device notifies the terminal identification information to the wireless base station device, or after a predetermined time elapses from the timing of the moving operation to the second wireless base station device. The stored base station identification information and terminal identification information are erased.

  With such a configuration, the wireless terminal device can release the identification information of the wireless base station device and the identification information given from the wireless base station device at an appropriate timing.

  (18) Preferably, the radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a connection operation to the radio base station apparatus or immediately after completion of the connection operation.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device, specifically, Performed during connection operation or immediately after completion of connection operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  (19) Preferably, the radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a reconnection operation to the radio base station apparatus or immediately after completion of the reconnection operation.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device. Performed during reconnection operation or immediately after completion of reconnection operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  (20) Preferably, the radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a handover operation to the radio base station apparatus or immediately after completion of the handover operation.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device, specifically, This is performed during the handover operation or immediately after the completion of the handover operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  (21) Preferably, the radio terminal apparatus transmits the terminal identification information to the radio base station apparatus in response to a request from the radio base station apparatus.

  Depending on the installation location of the radio base station apparatus, the handover operation parameters may be fixedly set according to the surrounding geographical information and the like. As described above, the wireless terminal device transmits the terminal identification information only when it is requested from the wireless base station device. Information that prompts adjustment can be prevented from being wastedly transmitted from the wireless terminal device.

  (22) Preferably, when the elapsed time is less than a predetermined value, the first radio base station apparatus gives the terminal identification information given to the radio terminal apparatus that newly selects itself as a communication destination. The same terminal identification information is not given.

  If the same identification information is given to a plurality of wireless terminal devices in the wireless base station device, it will not be understood which handover operation should be referred to even if the wireless terminal device transmits the terminal identification information. . As described above, the configuration is such that terminal identification information assigned in the past is not assigned to a new wireless terminal device within a predetermined time, so that the elapsed time to be used is correctly obtained, and inappropriate handover operation is more accurately performed. It becomes possible to detect.

  (23) Preferably, the wireless terminal device has a predetermined number of handover operations, a connection operation, and a reconnection operation, or a combination of at least any two of them. When the number of times is exceeded, the held terminal identification information is deleted.

  If the terminal identification number assigned by the radio base station apparatus is stored every time of the connection operation, the reconnection operation, and the handover operation, the usable memory area of the radio terminal apparatus is greatly reduced. As described above, the configuration in which the terminal identification information is erased when the specified number of times is exceeded makes it possible to prevent a significant decrease in the usable memory area of the wireless terminal device.

  (24) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A wireless communication system capable of communicating with the wireless base station, wherein the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information of the first radio base station apparatus is held, and the radio terminal apparatus measures an elapsed time from the timing of the movement operation of the first radio base station apparatus to the second radio base station apparatus, and After the completion of the moving operation to the second radio base station device, the terminal device holds when resuming communication with the radio base station device or starting a new moving operation to the radio base station device. The first radio base When the base station identification information of the device matches the base station identification information of the radio base station device newly selected as the communication destination and the elapsed time is less than a predetermined value, the predetermined information is transferred to the radio base station The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and receives the second information from the first radio base station apparatus by the radio terminal apparatus. It is determined that the movement operation to the radio base station apparatus is inappropriate, or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted .

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (25) Preferably, the wireless terminal apparatus deletes the stored base station identification information when the predetermined information is notified to the wireless base station apparatus or when the elapsed time becomes equal to or greater than the predetermined value.

  With such a configuration, the radio terminal apparatus can release the identification information of the radio base station apparatus at an appropriate timing.

  (26) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A wireless communication system capable of communicating with the wireless base station, wherein the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information of the first radio base station apparatus is held, and the radio terminal apparatus measures an elapsed time from the timing of the movement operation of the first radio base station apparatus to the second radio base station apparatus, and When the terminal device resumes communication with the radio base station device after the completion of the movement operation to the second radio base station device or starts a new movement operation to the radio base station device, The elapsed time is less than the predetermined value The first radio base station apparatus receives the notification from the radio terminal apparatus and notifies the radio base station apparatus of the stored base station identification information. When the received base station identification information matches its own identification information, the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate. Or the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (27) Preferably, the wireless terminal device erases the stored base station identification information when the base station identification information is notified to the wireless base station device or when the elapsed time is equal to or greater than the predetermined value. .

  With such a configuration, the radio terminal apparatus can release the identification information of the radio base station apparatus at an appropriate timing.

  (28) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A first wireless base station device that acquires terminal identification information of the wireless terminal device that selects itself as a communication destination from a device other than the first wireless base station device; The station device measures an elapsed time from the timing of the moving operation of the wireless terminal device that has been selected as the communication destination to the second wireless base station device, and the wireless terminal device performs the first wireless When resuming communication with the radio base station apparatus after completion of the movement operation from the base station apparatus to the second radio base station apparatus or when performing a new movement operation to the radio base station apparatus, Self terminal knowledge Information is notified to the radio base station apparatus, the first radio base station apparatus receives the notification from the radio terminal apparatus, and the terminal identification information notified from the radio terminal apparatus is acquired If it matches the terminal identification information and the elapsed time is less than a predetermined value, the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate Or the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, with the configuration in which a matching condition of identification information unique to the wireless terminal device is used as a detection condition, the elapsed time for each wireless terminal device can be acquired in the wireless base station device, thereby enabling more accurate detection of inappropriate movement operations. Become. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (29) Preferably, even if the first radio base station apparatus completes the movement operation of the radio terminal apparatus selecting itself as a communication destination to the second radio base station apparatus, the radio terminal apparatus The terminal identification information is stored, and the terminal identification information is deleted when the elapsed time exceeds the predetermined value.

  With such a configuration, the radio base station apparatus can appropriately hold and release identification information unique to the radio terminal apparatus.

  (30) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless base station device provides terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal that has selected itself as the communication destination. The elapsed time from the timing of the moving operation from the device itself to another wireless base station device is measured, and the wireless terminal device performs the base station identification information of the wireless base station device selected by itself as the communication destination, and the wireless The terminal identification information given from the base station apparatus is retained for a predetermined period, and the wireless terminal apparatus receives a second message from the first wireless base station apparatus among the plurality of wireless base station apparatuses. When the communication with the radio base station apparatus is newly resumed after the movement operation to the base station apparatus is completed, or when the movement operation to the radio base station apparatus is newly performed, the retained base station identification information and the above Terminal identification information is notified to the radio base station apparatus, and the first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus If the terminal identification information notified from the wireless terminal device matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the wireless terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the first radio base station apparatus by the radio terminal apparatus 2 Adjusting the timing of the moving operation of the radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (31) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless base station device provides terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal that has selected itself as the communication destination. The elapsed time from the timing of the moving operation from the device itself to another wireless base station device is measured, and the wireless terminal device is the base station identification information of the wireless base station device selected by itself as the communication destination, The terminal identification information given from the base station apparatus is retained for a predetermined period, and the wireless terminal apparatus receives a second message from the first wireless base station apparatus among the plurality of wireless base station apparatuses. When the communication with the radio base station apparatus is resumed after completion of the movement operation to the base station apparatus or when the movement operation to the radio base station apparatus is newly performed, the held first radio base When the base station identification information of the station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, the held terminal identification information is notified to the radio base station apparatus, and the first The wireless base station device receives the notification from the wireless terminal device, the terminal identification information notified from the wireless terminal device matches the terminal identification information provided by itself, and the elapsed time. If it is less than the predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or by the radio terminal apparatus Up From the first wireless base station apparatus for adjusting the timing of the movement operation to said second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted. Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  (32) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless terminal device holds base station identification information of a wireless base station device that it has selected as a communication destination for a predetermined period, and transmits it to another wireless base station device The elapsed time from the timing of the moving operation is measured, and the wireless terminal device completes the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. Later, when the communication with the radio base station apparatus is newly resumed or when the moving operation to the radio base station apparatus is newly started, the stored base station identification information and the radio base station newly selected as the communication destination If the base station identification information of the mobile station matches the base station identification information and the elapsed time from the timing of the mobile operation to the second radio base station apparatus is less than a predetermined value, the predetermined information is stored in the radio base station apparatus. The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and receives the second radio from the first radio base station apparatus by the radio terminal apparatus. It is determined that the movement operation to the base station apparatus is inappropriate, or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (33) A wireless communication system according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. The wireless terminal device holds base station identification information of a wireless base station device that it has selected as a communication destination for a predetermined period, and transmits it to another wireless base station device The elapsed time from the timing of the moving operation is measured, and the wireless terminal device completes the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. Later, when communication with the radio base station apparatus is resumed or when a movement operation to the radio base station apparatus is newly started, progress from the timing of the movement operation to the second radio base station apparatus itself time If it is less than a predetermined value, the base station identification information held is notified to the radio base station apparatus, and the first radio base station apparatus receives the notification from the radio terminal apparatus and receives the radio When the base station identification information notified from the terminal device matches its own identification information, the moving operation from the first radio base station device to the second radio base station device by the radio terminal device is performed. It is determined that it is inappropriate or the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (34) In order to solve the above problem, a radio terminal apparatus according to an aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, wherein the radio base station The apparatus gives terminal identification information to a radio terminal apparatus that selects itself as a communication destination, and the self-apparatus from the first radio base station apparatus to the second radio base station apparatus among the plurality of radio base station apparatuses The base station identification information of the first radio base station apparatus and the terminal identification information given from the first radio base station apparatus to its own radio terminal apparatus when a handover operation of the radio terminal apparatus is performed And when the communication with the radio base station apparatus is newly resumed in the own radio terminal apparatus after the completion of the handover operation to the second radio base station apparatus. In the case of performing the handover operation to the radio base station apparatus, and a notification section for notifying the base station identification information and the terminal identification information held by the holding unit in the radio base station apparatus.

  With such a configuration, the first radio base station apparatus that has established a communication connection two times before the radio terminal apparatus that caused an inappropriate handover operation has established a communication connection with itself. It is possible to identify which radio terminal apparatus has a problem in the handover operation among the existing radio terminal apparatuses. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (35) A radio terminal apparatus according to another aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, and among the plurality of radio base station apparatuses, A holding unit for holding the type of the handover operation when the handover operation of the own radio terminal device from the first radio base station device to the second radio base station device is performed; and the second radio After completion of the handover operation to the base station apparatus, when the communication with the radio base station apparatus is newly resumed in the own radio terminal apparatus or when a new handover operation to the radio base station apparatus is performed, the holding unit A notification unit configured to notify the radio base station apparatus of the type of the handover operation held by the mobile station.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (36) A radio terminal apparatus according to another aspect of the present invention is a radio terminal apparatus capable of communicating with a plurality of radio base station apparatuses by performing a handover operation, and among the plurality of radio base station apparatuses, When the handover operation of its own radio terminal device from the first radio base station device to the second radio base station device is performed, the moving speed of the own radio terminal device when the handover operation is performed is maintained And when the communication with the radio base station apparatus is newly resumed in the own radio terminal apparatus after completion of the handover operation to the second radio base station apparatus or a new radio base station apparatus A notifying unit for notifying the radio base station apparatus of the moving speed held by the holding unit when performing a handover operation to.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (37) In order to solve the above-described problem, a communication control method according to an aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the wireless terminal device performs a handover operation as described above. A communication control method in a wireless communication system capable of communicating with a plurality of wireless base station devices, wherein the wireless terminal device includes a second wireless base station from a first wireless base station device among the plurality of wireless base station devices. A step of holding base station identification information of the first radio base station apparatus and terminal identification information given from the first radio base station apparatus when performing a handover operation to the station apparatus; and the radio terminal When the apparatus resumes communication with the radio base station apparatus after completion of the handover operation to the second radio base station apparatus, or when a new handover is performed to the radio base station apparatus In the case of performing work, the held the base station identification information and the terminal identification information and a step of notifying to the wireless base station apparatus.

  With such a configuration, the first radio base station apparatus that has established a communication connection two times before the radio terminal apparatus that caused an inappropriate handover operation has established a communication connection with itself. It is possible to identify which radio terminal apparatus has a problem in the handover operation among the existing radio terminal apparatuses. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (38) A communication control method according to another aspect of the present invention includes a radio terminal device and a plurality of radio base station devices, and the radio terminal devices perform a handover operation to perform the plurality of radio base station devices. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device performs a handover operation from a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices When performing the handover operation, the wireless terminal device newly resumes communication with the radio base station device after the handover operation to the second radio base station device is completed. A case of notifying the radio base station apparatus of the type of the held handover operation when performing a handover operation to the radio base station apparatus Including.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (39) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the wireless terminal devices perform a handover operation to perform the plurality of wireless base station devices. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device performs a handover operation from a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices When the handover operation is performed, the wireless terminal device newly establishes a wireless base station after completing the handover operation to the second wireless base station device. When resuming communication with the station apparatus or when performing a new handover operation to the radio base station apparatus, the mobile base station apparatus is notified of the held movement speed. And a step.

  With such a configuration, the first radio base station apparatus in which the radio terminal apparatus has established a communication connection two times ago, which has caused an inappropriate handover operation, performs handover with itself as the handover destination. Among the operations, it can be specified which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  (40) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device moves from a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices The base station identification information of the first radio base station apparatus and the terminal identification information given from the first radio base station apparatus, and the first radio base station apparatus Measuring the elapsed time from the timing of the moving operation of the wireless terminal device that has been selected as a communication destination to the second wireless base station device; and the wireless terminal device Base When the communication with the radio base station apparatus is newly resumed after completion of the movement operation to the station apparatus, or when the movement operation to the radio base station apparatus is newly performed, the retained base station identification information and the terminal identification A step of notifying the radio base station apparatus of the information; and the first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus If the terminal identification information notified from the wireless terminal device matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the wireless terminal It is determined that the movement operation from the first radio base station device to the second radio base station device by the device is inappropriate, or the mobile terminal device has moved up from the first radio base station device. And adjusting the timing of the movement of the second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (41) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control method in a wireless communication system capable of communicating with the wireless base station device, wherein the wireless base station device gives terminal identification information to the wireless terminal device that selects itself as a communication destination, and the wireless terminal device Among the plurality of radio base station apparatuses, when performing a moving operation from the first radio base station apparatus to the second radio base station apparatus, the base station identification information of the first radio base station apparatus, and the first Holding the terminal identification information given from one radio base station apparatus; and the second radio base station of the radio terminal apparatus selected by the first radio base station apparatus as a communication destination Measuring the elapsed time from the timing of the moving operation to the device, and restarting the communication with the radio base station device after the wireless terminal device completes the moving operation to the second radio base station device The base station identification information of the held first radio base station apparatus and the base of the radio base station apparatus to be newly selected as the communication destination When the station identification information matches, the step of notifying the held terminal identification information to the radio base station apparatus, and the first radio base station apparatus receives the notification from the radio terminal apparatus, When the terminal identification information notified from the wireless terminal device matches the terminal identification information given by the wireless terminal device and the elapsed time is less than a predetermined value, the first non-transmission by the wireless terminal device is performed. It is determined that the movement operation from the base station apparatus to the second radio base station apparatus is inappropriate, or the radio terminal apparatus moves from the first radio base station apparatus to the second radio base station apparatus. Adjusting the timing of the moving operation.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted.

  (42) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device moves from a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices The base station identification information of the first radio base station apparatus is retained, and the elapsed time from the timing when the radio terminal apparatus moves to the second radio base station apparatus. And when the radio terminal device resumes communication with the radio base station device after the completion of the movement operation to the second radio base station device, or when the radio terminal device newly communicates with the radio base station device. Move motion When starting, the stored base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, and the elapsed time is less than a predetermined value If it is, the step of notifying the wireless base station device of predetermined information, and the first wireless base station device receiving the notification including the predetermined information from the wireless terminal device, the wireless terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the first radio base station apparatus by the radio terminal apparatus Adjusting the timing of the movement operation to the two radio base station apparatuses.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (43) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device moves from a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices The base station identification information of the first radio base station apparatus is retained, and the elapsed time from the timing when the radio terminal apparatus moves to the second radio base station apparatus. And when the radio terminal device resumes communication with the radio base station device after the completion of the movement operation to the second radio base station device, or when the radio terminal device newly communicates with the radio base station device. Move motion When starting, if the elapsed time is less than a predetermined value, notifying the stored base station identification information to the radio base station apparatus, and the first radio base station apparatus When the base station identification information notified from the radio terminal device matches the self-identification information in response to the notification from the radio terminal device, the second radio base station device sends the second information from the first radio base station device. It is determined that the moving operation to the radio base station apparatus is inappropriate, or the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted Including the step of.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (44) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control method in a wireless communication system capable of communicating with the first wireless base station device, wherein the first wireless base station device acquires terminal identification information of the wireless terminal device that selects itself as a communication destination from a device other than itself, The first radio base station apparatus measuring an elapsed time from the timing of the moving operation of the radio terminal apparatus selected as a communication destination to the second radio base station apparatus; and the radio terminal When the apparatus restarts communication with the radio base station apparatus after completion of the moving operation from the first radio base station apparatus to the second radio base station apparatus, or newly to the radio base station apparatus When performing the moving operation, the step of notifying the radio base station apparatus of its own terminal identification information, and the first radio base station apparatus receiving the notification from the radio terminal apparatus, the radio terminal If the terminal identification information notified from the device matches the acquired terminal identification information and the elapsed time is less than a predetermined value, the wireless terminal device from the first radio base station device It is determined that the movement operation to the second radio base station apparatus is inappropriate, or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus Adjusting.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, with the configuration in which a matching condition of identification information unique to the wireless terminal device is used as a detection condition, the elapsed time for each wireless terminal device can be acquired in the wireless base station device, thereby enabling more accurate detection of inappropriate movement operations. Become. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (45) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with the wireless base station device, wherein the wireless base station device selects the mobile device itself as a communication destination, and the timing of the moving operation from the wireless terminal device to another wireless base station device Measuring the elapsed time from the base station identification information of the radio base station device that the radio terminal device has selected as a communication destination, and the terminal identification information given from the radio base station device for a predetermined period And the step of holding, after the wireless terminal device completes the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, When the communication with the radio base station apparatus is resumed or when a new moving operation to the radio base station apparatus is performed, the held base station identification information and the terminal identification information are notified to the radio base station apparatus. And when the first radio base station apparatus receives the notification from the radio terminal apparatus, the base station identification information notified from the radio terminal apparatus matches its own identification information, and the radio terminal When the terminal identification information notified from the device matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station device by the radio terminal device From the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is judged that the movement operation from the first radio base station apparatus to the second radio base station apparatus is inappropriate And adjusting the timing.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (46) A communication control method according to another aspect of the present invention includes a radio terminal device and a plurality of radio base station devices, and the plurality of radio base station devices when the radio terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with the wireless base station device, wherein the wireless base station device assigns terminal identification information to the wireless terminal device that selects itself as a communication destination and selects itself as a communication destination A step of measuring an elapsed time from the timing of the moving operation from the wireless terminal device to another wireless base station device, and a base station of the wireless base station device that the wireless terminal device has selected as a communication destination A step of holding identification information and terminal identification information given from the radio base station apparatus for a predetermined period; and the radio terminal apparatus comprises the plurality of radio base station apparatuses Among them, after completing the movement operation from the first radio base station apparatus to the second radio base station apparatus, when resuming communication with the radio base station apparatus or newly moving to the radio base station apparatus If the stored base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, the held terminal identification A step of notifying the radio base station apparatus of the information; and the first radio base station apparatus receives the notification from the radio terminal apparatus, and the terminal identification information notified from the radio terminal apparatus And when the elapsed time is less than a predetermined value, the wireless terminal device moves from the first wireless base station device to the second wireless base station device. Inoperable Or it is determined that a switching or from the first radio base station apparatus by the wireless terminal and adjusting the timing of the movement operation to said second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted. Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  (47) A communication control method according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device holds base station identification information of a wireless base station device selected by itself as a communication destination for a predetermined period of time and A step of measuring an elapsed time from the timing of the moving operation to the base station device, and the wireless terminal device is a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices. When the communication with the radio base station apparatus is newly resumed or the movement operation to the radio base station apparatus is newly started after the completion of the movement operation to the radio base station apparatus, the stored base station identification information and the new communication destination If the base station identification information of the radio base station device to be selected matches and the elapsed time from the timing of the moving operation to the second radio base station device is less than a predetermined value, A step of notifying the radio base station device of predetermined information; and the first radio base station device receives the notification including the predetermined information from the radio terminal device, and receives the first notification by the radio terminal device. It is determined that the movement operation from the radio base station apparatus to the second radio base station apparatus is inappropriate, or the radio terminal apparatus moves from the first radio base station apparatus to the second radio base station apparatus Adjusting the timing of the moving operation.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (48) A communication control method according to another aspect of the present invention includes a radio terminal device and a plurality of radio base station devices, and the radio terminal devices perform a moving operation so that the plurality of radio base station devices are operated. Control method in a wireless communication system capable of communicating with a wireless communication system, wherein the wireless terminal device holds base station identification information of a wireless base station device selected by itself as a communication destination for a predetermined period of time and A step of measuring an elapsed time from the timing of the moving operation to the base station device, and the wireless terminal device is a first wireless base station device to a second wireless base station device among the plurality of wireless base station devices. When the communication with the radio base station apparatus is newly resumed or the movement operation to the radio base station apparatus is newly started after completion of the movement operation to the radio base station apparatus, the mobile station moves to the second radio base station apparatus. Movement When the elapsed time from the timing is less than a predetermined value, the held base station identification information is notified to the radio base station device, and the first radio base station device In response to the notification, when the base station identification information notified from the wireless terminal device matches its own identification information, the first wireless base station device to the second wireless base station by the wireless terminal device Determining that the movement operation to the station apparatus is inappropriate or adjusting the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus; Including.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (49) In order to solve the above-described problem, a communication control program according to an aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the wireless terminal device performs a moving operation to perform the above operation. A communication control program used in a wireless communication system capable of communicating with a plurality of wireless base station devices, wherein the wireless terminal device is connected to a computer from a first wireless base station device among the plurality of wireless base station devices. A step of holding the base station identification information of the first radio base station apparatus and the terminal identification information given from the first radio base station apparatus when performing a moving operation to the second radio base station apparatus; And when the first radio base station apparatus has elapsed from the timing of the moving operation of the radio terminal apparatus selected as the communication destination to the second radio base station apparatus. And when the wireless terminal device restarts communication with the wireless base station device after the completion of the moving operation to the second wireless base station device, or a new connection to the wireless base station device. A step of notifying the radio base station apparatus of the stored base station identification information and the terminal identification information when the mobile operation is performed; and the first radio base station apparatus transmits the notification from the radio terminal apparatus. In response, the base station identification information notified from the wireless terminal device matches its own identification information, and the terminal identification information notified from the wireless terminal device matches the terminal identification information given by itself. If the elapsed time is less than a predetermined value, whether the wireless terminal device determines that the movement operation from the first wireless base station device to the second wireless base station device is inappropriate Or a program for executing a step of adjusting the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the wireless terminal.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (50) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program in a wireless communication system capable of communicating with a computer, wherein the wireless base station device gives terminal identification information to the wireless terminal device that selects itself as a communication destination; Is a base station identification information of the first radio base station device when performing a moving operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices, And holding the terminal identification information given from the first radio base station apparatus, and the radio terminal that the first radio base station apparatus has selected as its communication destination A step of measuring an elapsed time from the timing of the movement operation of the device to the second radio base station device; and after the wireless terminal device completes the movement operation to the second radio base station device, When resuming communication with the radio base station apparatus or when newly moving to the radio base station apparatus, the stored base station identification information of the first radio base station apparatus and a new communication destination When the base station identification information of the radio base station device to be selected matches, the step of notifying the radio base station device of the held terminal identification information; and the first radio base station device If the terminal identification information notified from the wireless terminal device matches the terminal identification information provided by itself and the elapsed time is less than a predetermined value, It is determined that the movement operation from the first radio base station device to the second radio base station device by the terminal device is inappropriate, or the first radio base station device by the radio terminal device And a step of adjusting the timing of the moving operation to the radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted.

  (51) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with a computer, wherein the wireless terminal device is connected to a second wireless base station from a first wireless base station device among the plurality of wireless base station devices. A step of holding the base station identification information of the first radio base station device when the mobile terminal performs a movement operation to the device, and the wireless terminal device performs a movement operation of the first radio base station device to the second radio base station device. A step of measuring an elapsed time from the timing, and when the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device Or, when starting a new moving operation to the radio base station apparatus, the stored base station identification information of the first radio base station apparatus and the base station identification information of the radio base station apparatus to be newly selected as a communication destination And when the elapsed time is less than a predetermined value, the step of notifying the radio base station device of predetermined information, and the first radio base station device Upon receiving the notification including the predetermined information, it is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or the radio terminal apparatus For adjusting the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (52) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with a computer, wherein the wireless terminal device is connected to a second wireless base station from a first wireless base station device among the plurality of wireless base station devices. A step of holding the base station identification information of the first radio base station device when the mobile terminal performs a movement operation to the device, and the wireless terminal device performs a movement operation of the first radio base station device to the second radio base station device. A step of measuring an elapsed time from the timing, and when the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device Or, when starting the moving operation to the radio base station device newly, if the elapsed time is less than a predetermined value, the step of notifying the radio base station device of the held base station identification information, When the first radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal apparatus It is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus is inappropriate by the first radio base station apparatus or the second radio base station apparatus performs the second operation from the first radio base station apparatus And a step of adjusting a timing of a moving operation to the radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized.

  (53) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with a computer, wherein the first wireless base station device selects terminal identification information of the wireless terminal device selected by itself as a communication destination from a device other than itself. A step of acquiring, and a step of measuring an elapsed time from the timing of the moving operation of the wireless terminal device that has been selected as the communication destination to the second wireless base station device by the first wireless base station device And after the wireless terminal device completes the moving operation from the first wireless base station device to the second wireless base station device, communication with the wireless base station device is newly resumed. In the case of performing or moving to the radio base station device, the step of notifying the radio base station device of its own terminal identification information, and the first radio base station device When the terminal identification information notified from the wireless terminal device is received from the wireless terminal device matches the acquired terminal identification information and the elapsed time is less than a predetermined value, the wireless terminal device It is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus is inappropriate by the first radio base station apparatus or the second radio base station apparatus performs the second operation from the first radio base station apparatus And a step of adjusting a timing of a moving operation to the radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, with the configuration in which a matching condition of identification information unique to the wireless terminal device is used as a detection condition, the elapsed time for each wireless terminal device can be acquired in the wireless base station device, thereby enabling more accurate detection of inappropriate movement operations. Become. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, the movement operation can be controlled more accurately and the movement operation can be further optimized.

  (54) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with a computer, from the self by the wireless terminal device selected as the communication destination by the wireless base station device to another wireless base station device Measuring the elapsed time from the timing of the mobile operation, the base station identification information of the radio base station apparatus that the radio terminal apparatus has selected as the communication destination, and the terminal identification given from the radio base station apparatus A step of holding information for a predetermined period, and the wireless terminal device receives a second from the first wireless base station device among the plurality of wireless base station devices. When the communication with the radio base station apparatus is newly resumed after the completion of the movement operation to the line base station apparatus or when the movement operation to the radio base station apparatus is newly performed, the stored base station identification information and Notifying the radio base station apparatus of the terminal identification information; and the base station identification notified from the radio terminal apparatus when the first radio base station apparatus receives the notification from the radio terminal apparatus. When the information matches its own identification information, the terminal identification information notified from the wireless terminal device matches the terminal identification information given by itself, and the elapsed time is less than a predetermined value, It is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or whether the first radio base station apparatus by the radio terminal apparatus is the first radio base station apparatus Is a program for executing a step of adjusting the timing of the movement operation to said second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. It is possible to acquire and more accurately detect inappropriate movement. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (55) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. Is a communication control program in a wireless communication system capable of communicating with a computer, wherein the wireless base station device gives terminal identification information to the wireless terminal device for selecting itself as a communication destination, and uses itself as a communication destination. A step of measuring an elapsed time from the timing of the moving operation from the self to another radio base station by the selected radio terminal, and the radio base station selected by the radio terminal as a communication destination The base station identification information and the terminal identification information given from the radio base station apparatus for a predetermined period, and the radio terminal apparatus When the communication operation with the radio base station apparatus is newly resumed after completion of the movement operation from the first radio base station apparatus to the second radio base station apparatus among the plurality of radio base station apparatuses or newly In the case of performing a movement operation to the radio base station apparatus, the held base station identification information of the first radio base station apparatus and the base station identification information of the radio base station apparatus to be newly selected as a communication destination are If they match, the step of notifying the wireless base station device of the held terminal identification information, and the first wireless base station device receiving the notification from the wireless terminal device and notifying from the wireless terminal device When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus 2 nothing Determining that the movement operation to the base station apparatus is inappropriate, or adjusting the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus; Is a program for executing

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation. Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation. In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted. Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  (56) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with the computer, wherein the wireless terminal device holds base station identification information of a wireless base station device selected as a communication destination by itself for a predetermined period, A step of measuring an elapsed time from the timing of the movement operation of the mobile station to another radio base station device; and the radio terminal device is connected to a second radio base station device from the first radio base station device among the plurality of radio base station devices. After the completion of the moving operation to the radio base station device, when the communication with the radio base station device is resumed or when the moving operation to the radio base station device is newly started, The base station identification information and the base station identification information of the radio base station apparatus to be newly selected as the communication destination match, and the elapsed time from the timing of the mobile operation to the second radio base station apparatus Is less than a predetermined value, the step of notifying the radio base station apparatus of predetermined information and the first radio base station apparatus receiving the notification including the predetermined information from the radio terminal apparatus The mobile terminal determines that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or the first radio base station apparatus by the radio terminal apparatus To adjust the timing of the moving operation from the mobile station to the second radio base station apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an improper movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  (57) A communication control program according to another aspect of the present invention includes a wireless terminal device and a plurality of wireless base station devices, and the plurality of wireless base station devices when the wireless terminal device performs a moving operation. A communication control program used in a wireless communication system capable of communicating with the computer, wherein the wireless terminal device holds base station identification information of a wireless base station device selected as a communication destination by itself for a predetermined period, A step of measuring an elapsed time from the timing of the movement operation of the mobile station to another radio base station device; and the radio terminal device is connected to a second radio base station device from the first radio base station device among the plurality of radio base station devices. After completing the movement operation to the radio base station apparatus, when resuming communication with the radio base station apparatus or starting a new movement operation to the radio base station apparatus, When the elapsed time from the timing of the movement operation to the second radio base station apparatus is less than a predetermined value, the held base station identification information is notified to the radio base station apparatus, and the first When the radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal apparatus It is determined that the moving operation from one radio base station apparatus to the second radio base station apparatus is inappropriate, or the first radio base station apparatus to the second radio base station by the radio terminal apparatus And a step for adjusting the timing of the moving operation to the apparatus.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate movement operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic. Then, the radio base station apparatus detects an inappropriate movement operation, for example, and can adjust the parameter for controlling the movement operation to suppress the inappropriate movement operation, thereby constructing a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate movement operation. Furthermore, the configuration of measuring the elapsed time in the wireless terminal device enables more accurate detection of an inappropriate movement operation. Then, the movement operation can be controlled more accurately in the radio base station apparatus, and the movement operation can be further optimized. In addition, when performing a movement operation to a new radio base station apparatus, the identification information of the past movement-source radio base station apparatus and the identification information given from the radio base station apparatus are only for one radio base station apparatus. Compared with the configuration in which the image is held, inappropriate movement can be detected in a wider range.

  According to the present invention, communication can be stabilized by detecting an inappropriate handover operation.

It is a figure which shows the structure of the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the sequence of the hand-over operation | movement in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 3 is a diagram illustrating an example of a situation in which an inappropriate handover operation (Too Late HO) has occurred in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows an example of the sequence of an improper handover operation (Too Late HO) and its detection process in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 3 is a diagram illustrating an example of a situation in which an inappropriate handover operation (Too Early HO) has occurred in the wireless communication system according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating an example of a situation in which an inappropriate handover operation (Too Early HO) has occurred in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows an example of the sequence of the improper handover operation (Too Early HO) and its detection process in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 3 is a diagram illustrating an example of a situation in which an inappropriate handover operation (HO to Wron Cell) has occurred in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows an example of the sequence of the improper handover operation (HO to Wong Cell) and its detection process in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows the simulation result of the reception quality of the radio | wireless terminal apparatus in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. In the radio | wireless communications system which concerns on the 1st Embodiment of this invention, it is a figure which shows event A1 in which a radio | wireless terminal apparatus transmits a notification of a measurement result. FIG. 7 is a diagram illustrating an event A2 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. FIG. 7 is a diagram illustrating an event A3 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows event A4 which a radio | wireless terminal apparatus transmits a measurement result notification in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 7 is a diagram illustrating an event A5 in which a wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows the timing control of the hand-over operation by adjustment of hysteresis HS in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows the timing control of the hand-over operation by adjustment of TTT in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 5 is a diagram illustrating timing control of a handover operation by adjusting an offset OST in the wireless communication system according to the first embodiment of the present invention. It is a figure which shows the structure of the radio base station apparatus which concerns on the 1st Embodiment of this invention. FIG. 6 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Too Early HO” detection process. FIG. 6 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Too Early HO” detection process. FIG. 6 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Too Early HO” detection process. FIG. 6 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Too Early HO” detection process. FIG. 6 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Too Early HO” detection process. It is a figure which shows an example of the RLF report which a radio | wireless terminal apparatus transmits in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. FIG. 7 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process. FIG. 7 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process. FIG. 7 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process. FIG. 7 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process. FIG. 7 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process. It is a figure which shows an example of the PingPong report which a radio | wireless terminal apparatus transmits in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the scenario assumed in the radio | wireless communications system which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of the scenario assumed in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of the sequence of the detection process of the inappropriate handover operation (HO to Wong Cell), and the optimization process of a handover operation in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the radio | wireless terminal apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows the structure of the control part in the radio | wireless terminal apparatus which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of the content of the RLF report in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of the content of the RLF notification in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of the content of the handover report in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention. It is a figure which shows an example of the sequence of the detection process of the inappropriate handover operation (HO to Wong Cell), and the optimization process of a handover operation in the radio | wireless communications system which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The radio base station apparatus notifies the radio terminal apparatus of information about the cell and the neighboring cell that it forms, that is, the frequency of the radio signal and the ID (identification) of the neighboring cell. The wireless terminal device detects and measures neighboring cells based on information notified from the wireless base station device. The wireless terminal device starts moving to the neighboring cell based on the measurement result. Here, “movement” of the wireless terminal device means not only handover but also through which cell the wireless terminal device in an idle state starts communication in the future, that is, when a call or data communication is started. This means selecting whether to perform communication.

  For example, when the wireless terminal device is communicating with the wireless base station device, the destination of the wireless terminal device is determined by the wireless base station device or a higher-level device in the core network. For example, when the wireless terminal device is not communicating with the wireless base station device, the wireless terminal device determines the destination of the wireless terminal device.

  In addition, handover means that a radio base station apparatus that is a communication partner of a radio terminal apparatus during a call or data communication is switched.

  The wireless terminal device is located in a cell means that the wireless terminal device selects a wireless base station device forming the cell as a communication destination and can communicate with the wireless base station device. This means that communication is in progress.

  The femtocell and access mode are described in 3GPP (Third Generation Partnership Project) SPEC TS 22.22 as follows. That is, a femto base station is a customer premises apparatus that connects a wireless terminal device connected via a wireless interface to a mobile communication carrier network using an IP backhaul.

  Further, in the femtocell access mode, the femto base station in the closed access mode provides a service only to related CSG (Closed Subscriber Group) members. The hybrid mode femto base station also provides services to the associated CSG members and CSG non-members. The femto base station in the open access mode operates as a normal base station.

  Such a 3GPP definition may also be applied to the wireless communication system according to the embodiment of the present invention.

  Further, the following definitions can be applied together with or separately from the above definitions.

  The macro base station and the pico base station are wireless base station devices that are under the management of the operator and can communicate with the wireless base station device that has contracted with the operator. Further, it is considered that the macro base station and the pico base station are basically not turned off.

  A femto base station is a radio base station apparatus that is installed mainly in an individual or corporate building and may move or be turned off depending on the circumstances of the user.

  Further, the femto base station operates in one of open / hybrid / closed access modes. When the femto base station operates in the closed access mode, only registered members (terminals) can be connected. When operating in the closed access mode, the service is provided only to registered members. When operating in the hybrid mode, the service is provided to both registered members and unregistered members, that is, non-members. When operating in the open access mode, the same operation as that of the macro base station and the pico base station is performed.

<First Embodiment>
[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 1, the radio communication system is a mobile communication system according to LTE (Long Term Evolution) standardized by, for example, 3GPP (Third Generation Partnership Project), and includes radio base station apparatuses 101A and 101B. In FIG. 1, two radio base station apparatuses are representatively shown, but a larger number of radio base station apparatuses may be provided.

  Radio base station apparatuses 101A and 101B are, for example, femto base stations, pico base stations, or macro base stations.

  The radio base station apparatus 101A can communicate with the radio terminal apparatus 202 by forming a cell CA and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CA. The radio base station apparatus 101B can communicate with the radio terminal apparatus 202 by forming a cell CB and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CB.

  Here, the direction from the wireless terminal device to the core network is referred to as an uplink direction, and the direction from the core network to the wireless terminal device is referred to as a downlink direction.

  The radio base station apparatus and the radio terminal apparatus in the radio communication system according to the first embodiment of the present invention read and execute a program including each step of the following sequences from a memory (not shown). This program can be installed externally. The installed program is distributed in a state stored in a recording medium, for example.

  FIG. 2 is a diagram showing an exemplary sequence of a handover operation in the wireless communication system according to the first embodiment of the present invention.

  Here, as shown in FIG. 1, it is assumed that the wireless terminal device 202 is located in the cell CA and is in communication with the wireless base station device 101A, and moves to an overlapping area of the cell CA and the cell CB. To do.

  Referring to FIG. 2, first, radio base station apparatus 101A sets a frequency to be measured by radio terminal apparatus 202 in communication with itself and another radio base station apparatus that transmits a radio signal of the frequency. (Step S1).

  Next, the wireless base station device 101A sends a measurement start request (Measurement Configuration) to the wireless terminal device 202 to cause the wireless terminal device 202 to measure the reception level of the wireless signal transmitted from the other wireless base station device that has been set. Send. This measurement start request includes neighboring cell information, that is, the cell ID of the radio base station apparatus to be measured. Further, the measurement start request includes the transmission frequency of each radio base station device (step S2).

  Next, the wireless terminal device 202 receives the measurement start request from the wireless base station device 101A and starts the power measurement process (Measurement), that is, the wireless indicated by the measurement start request at the frequency indicated by the received measurement start request. The received power of the radio signal transmitted from the base station apparatus is measured (step S3).

  Next, the wireless terminal device 202 transmits a measurement result notification (Measurement Report) indicating the measurement result of the received power to the wireless base station device 101A. For example, the wireless terminal device 202 periodically measures the received power, when the communication state with the wireless base station device 101A deteriorates, and with other wireless base station devices other than the wireless base station device 101A When the state becomes better, a measurement result notification is transmitted to the radio base station apparatus 101A (step S4).

  Next, 101 A of radio base station apparatuses acquire the measurement information which shows the measurement result for every cell ID based on the measurement result notification received from the radio | wireless terminal apparatus 202, and preserve | save it in the memory | storage part which is not shown in figure (step S5).

  Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. For example, the radio base station apparatus 101B is determined as a handover destination with reference to the information (step S6).

  Next, the radio base station device 101A transmits a handover request indicating the radio base station device 101B to the higher-level device (step S7).

  Next, the host device receives the handover request from the radio base station device 101A and transmits the handover request to the radio base station device 101B (step S8).

  Next, the radio base station device 101B receives the handover request from the higher-level device and transmits a handover response to the handover request to the higher-level device (step S9).

  Next, the higher-level apparatus receives a handover response from the radio base station apparatus 101B, and transmits a handover instruction to the radio base station apparatus 101A (step S10).

  Next, the radio base station apparatus 101A receives a handover instruction from the host apparatus and transmits an RRC (Radio Resource Control) connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal apparatus 202 (step S11).

  Next, the radio base station apparatus 101A transmits a status notification indicating its own communication status and the like to the higher level apparatus (step S12).

  Next, the higher-level device receives the state notification from the wireless base station device 101A, and transmits a state notification indicating the communication contents and the like with the wireless terminal device 202 to the wireless base station device 101B (step S13).

  Further, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101B ( Step S14).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202 and transmits a handover completion notification to the higher-level apparatus (step S15).

  Next, the higher-level apparatus receives a handover completion notification from the radio base station apparatus 101B, and transmits a terminal information release instruction to the radio base station apparatus 101A (step S16).

  Next, the wireless base station device 101A receives a terminal information release instruction from the higher-level device, releases information related to the wireless terminal device 202, and transmits a terminal information release completion notification to the higher-level device (step S17).

[Example of inappropriate handover operation]
Hereinafter, a radio base station apparatus communicating with the radio terminal apparatus 202 or a handover source radio base station apparatus is also referred to as a serving base station, and a handover destination radio base station apparatus is also referred to as a neighboring base station.

  FIG. 3 is a diagram illustrating an example of a situation where an inappropriate handover operation (Too Late HO) occurs in the wireless communication system according to the first embodiment of the present invention.

  FIG. 4 is a diagram showing an example of an inappropriate handover operation (Too Late HO) and its detection processing sequence in the wireless communication system according to the first embodiment of the present invention.

  “Too Late HO” refers to the following cases, for example. That is, before the handover starts or during the handover process, a radio link failure (RLF) occurs in the handover source radio base station apparatus, and a radio base station other than the handover source radio base station apparatus. This is a case where connection re-establishment of the wireless terminal device 202 to the device has occurred.

  The detection method of “Too Late HO” is as follows, for example. That is, when the radio terminal device 202 reestablishes the radio link to the radio base station device 101B after causing the RLF for the radio base station device 101A, the radio base station device 101B notifies the radio base station device 101A of the RLF. Send. Thereby, the wireless base station device 101A detects “Too Late HO”.

  Here, as shown in FIG. 3, it is assumed that radio terminal apparatus 202 is located in cell CA and is communicating with radio base station apparatus 101A.

  Referring to FIG. 3 and FIG. 4, first, radio terminal apparatus 202 measures the received power of a radio signal transmitted from each radio base station apparatus, and wirelessly sends a measurement result notification indicating the measured result of the received power. It transmits to base station apparatus 101A (step S51).

  Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When it is determined that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S52).

  Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an inter-base station interface (step S53).

  Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S54).

  Here, while preparing for handover on the network side, that is, while the radio base station apparatuses 101A and 101B are transmitting and receiving a message for handover as described above, the radio terminal apparatus 202 is out of service area of the cell CA, and Move to within the cell CB (step S55).

  Due to the movement of the wireless terminal device 202, the RRC connection reconfiguration instruction (step S56) for instructing the handover transmitted from the wireless base station device 101A does not reach the wireless terminal device 202, and RLF is generated (step S56). S57).

  Next, when the radio terminal apparatus 202 detects the occurrence of RLF, the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101B. A connection re-establishment request (RRC Connection Reestablishment Request) is transmitted (step S58).

  Next, the radio base station apparatus 101B receives the RRC connection re-establishment request from the radio terminal apparatus 202, and transmits an RRC connection re-establishment response to the radio terminal apparatus 202 (step S59). Thereby, an RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B.

  Next, the wireless terminal device 202 transmits an RRC connection reestablishment completion notification (RRC Connection Reestablishment Complete) to the wireless base station device 101B (step S60).

  This RRC connection re-establishment completion notification includes, for example, a parameter “rlf-InfoAvailable”. The wireless terminal device 202 sets this parameter and transmits an RRC connection re-establishment completion notification. Thereby, the radio base station apparatus 101B recognizes that an RLF has occurred in the radio terminal apparatus 202. The radio base station apparatus 101B transmits a terminal information request (UE Information Request) to the radio terminal apparatus 202 in order to acquire detailed information of the RLF (step S61).

  Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101B, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101B (step S62). The RLF report includes the PCI (Physical Cell ID) of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI (E-UTRAN Cell Global Identifier) of the radio base station apparatus in which the RRC connection has been reestablished, and the own radio terminal apparatus 202. C-RNTI (Cell Radio Network Temporary Identifier) and the like. Here, the PCI of the RLF occurrence is the ID of the radio base station apparatus 101A, the PCI and ECGI of the RRC connection re-establishment occurrence are the ID of the radio base station apparatus 101B, and the C-RNTI is assigned by the radio base station apparatus 101A ID.

  Next, the radio base station apparatus 101B recognizes that RLF has occurred in the radio base station apparatus 101A by referring to the PCI indicated by the RLF report received from the radio terminal apparatus 202. Then, the radio base station apparatus 101B transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101A via the X2 interface in order to notify that it is “Too Late HO” ( Step S63).

  Next, the radio base station apparatus 101A recognizes that “Too Late HO” has occurred to the cell CB by referring to the PCI, ECGI, and C-RNTI of the RLF notification received from the radio base station apparatus 101B. (Step S64).

  Next, the radio base station apparatus 101A performs a handover operation optimization process so as to suppress the occurrence of “Too Late HO” in the cell CB (step S65).

  5 and 6 are diagrams illustrating an example of a situation in which an inappropriate handover operation (Too Early HO) has occurred in the wireless communication system according to the first embodiment of the present invention.

  5 and 6, cell CB formed by radio base station apparatus 101B includes cell CB1 including the installation area of radio base station apparatus 101B, and radio base station apparatus 101B formed in cell CA. The cell CB2 does not include an installation area.

  FIG. 7 is a diagram showing an example of an inappropriate handover operation (Too Early HO) and its detection processing sequence in the wireless communication system according to the first embodiment of the present invention.

  “Too Early HO” refers to the following case, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and the wireless terminal device 202 is reconnected to the handover source wireless base station device. This is the case when establishment occurs.

  The detection method of “Too Early HO” is as follows, for example. That is, when the handover destination radio base station apparatus 101B receives the RLF report from the handover source radio base station apparatus 101A, the handover to the radio terminal apparatus 202 itself is performed within a predetermined time from the reception timing. When the terminal information release instruction due to the completion of is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “Too Early HO”.

  Here, the radio base station apparatus 101B uses a timer to measure the predetermined time. Thereby, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to “Too Early HO” of the radio base station apparatus 101A. Can be determined.

  Here, as shown in FIG. 5, a case is assumed in which radio terminal apparatus 202 moves into cell CB2 from a state where it is located in cell CA and is communicating with radio base station apparatus 101A (step S70). .

  5 to 7, first, radio terminal apparatus 202 measures the reception power of a radio signal transmitted from a radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured reception power to radio base station. It transmits to station apparatus 101A (Source eNB, Serving eNB) (step S71).

  Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When determining that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S72).

  Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an inter-base station interface (step S73).

  Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S74).

  Next, the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal apparatus 202 (step S75).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification to the wireless base station device 101B. (Step S76).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A (step S77).

  Further, the radio base station apparatus 101B starts a timer in order to measure the stay time in the cell CB of the radio terminal apparatus 202 (step S78).

  Next, the radio base station apparatus 101A receives a terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) on the radio terminal apparatus 202 (step S79).

  Thus, the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101B is completed (step S80).

  Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101B, the radio terminal apparatus 202 moves out of the cell CB and into the cell CA (step S81).

  Then, since the wireless terminal device 202 cannot communicate with the wireless base station device 101B, RLF occurs (step S83).

  Next, when the radio terminal apparatus 202 detects the occurrence of RLF, the radio terminal apparatus 202 searches for a neighboring radio base station apparatus by measuring the reception power of the radio signal and reconnects to the searched radio base station apparatus 101A. A connection reestablishment request (RRC Connection Reestablishment Request) is transmitted (step S84).

  Next, since the wireless base station device 101A has released and does not hold the information (UE Context) regarding the wireless terminal device 202, the wireless base station device 101A can accept the RRC connection re-establishment request from the wireless terminal device 202. If it is not possible (step S85), an RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S86).

  Next, when receiving the RRC connection re-establishment rejection from the radio base station apparatus 101A, the radio terminal apparatus 202 starts a normal connection procedure with the radio base station apparatus 101A (step S87).

  That is, first, the wireless terminal device 202 transmits an RRC connection request to the wireless base station device 101A (step S88).

  Next, the wireless base station device 101A receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S89).

  Next, the wireless terminal device 202 receives RRC connection information from the wireless base station device 101A, and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S90).

  Next, the wireless base station device 101A receives the RRC connection completion notification from the wireless terminal device 202, and transmits security information (Security Mode Command) to the wireless terminal device 202 (step S91).

  Next, the wireless terminal device 202 receives the security information from the wireless base station device 101A, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101A (step S92).

  Next, the radio base station apparatus 101A transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal apparatus 202 (step S93).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101A, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101A. (Step S94).

  Here, the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”. The wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification. As a result, the radio base station apparatus 101A recognizes that an RLF has occurred in the radio terminal apparatus 202. The wireless base station device 101A transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S95).

  Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101A, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101A (step S96). The RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF generation is the ID of the radio base station apparatus 101B, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101A, and the C-RNTI is assigned by the radio base station apparatus 101B ID.

  Next, the radio base station apparatus 101A recognizes that the RLF has occurred in the radio base station apparatus 101B by referring to the PCI indicated by the RLF report received from the radio terminal apparatus 202, and performs “Too Late” to the cell CA. It is determined that HO "has occurred (step S97).

  Next, the radio base station apparatus 101A transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface in order to notify that it is “Too Late HO”. (Step S98).

  Next, when the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101A, the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” for the cell CA but “Too Early HO” for the cell CB. When the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101A and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CA And “Too Late HO”.

  If the radio base station apparatus 101B determines that it is “Too Early HO” to the cell CB (step S99), it transmits a handover report to the radio base station apparatus 101A (step S100). The handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101B notifies the radio base station apparatus 101A of “Too Early HO” by setting this parameter to a predetermined value.

  Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “Too Early HO” has occurred to the cell CB (step S101), and performs “Too Early HO”. A handover operation optimization process is executed so as to suppress the occurrence of (step S102).

  FIG. 8 is a diagram illustrating an example of a situation where an inappropriate handover operation (HO to Wron Cell) occurs in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 8, the radio communication system further includes radio base station apparatus 101C as compared with the radio communication system shown in FIG. Radio base station apparatus 101C is, for example, a femto base station, a pico base station, or a macro base station.

  The radio base station apparatus 101C can communicate with the radio terminal apparatus 202 by forming a cell CC and transmitting and receiving radio signals to and from the radio terminal apparatus 202 existing in the cell CC.

  FIG. 9 is a diagram illustrating an example of an improper handover operation (HO to Wong Cell) and its detection processing sequence in the wireless communication system according to the first embodiment of the present invention.

  “HO to Wong Cell” refers to the following case, for example. That is, after the wireless terminal device 202 has successfully connected to the handover destination wireless base station device, RLF occurs in a short time, and wireless communication is performed with respect to wireless base station devices other than the handover source and handover destination wireless base station devices. This is a case where the connection re-establishment of the terminal device 202 occurs.

  The detection method of “HO to Wong Cell” is, for example, as follows. That is, when the radio base station apparatus 101B that is the handover destination receives the RLF report from the radio base station apparatus 101C other than the radio base station apparatus 101A that is the handover source, the radio terminal is traced back from the reception timing within a predetermined time. When the terminal information release instruction due to the completion of the handover of the apparatus 202 to itself is transmitted to the radio base station apparatus 101A, the radio base station apparatus 101A is notified that “HO to Wong Cell”.

  Here, the radio base station apparatus 101B uses a timer to measure the predetermined time. Thereby, when the radio base station apparatus 101B receives the RLF report, whether the RLF has occurred due to its own “Too Late HO” or whether the RLF has occurred due to the “HO to Wong Cell” of the radio base station apparatus 101A Can be determined.

  Here, as shown in FIG. 8, when the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A, the wireless terminal device 202 moves to the overlapping area of the virtual cell CBV and the cell CA ( Assume step S110). The virtual cell CBV is a virtual cell expanded from the cell CB in accordance with the offset OST that is a parameter in order to promote handover from the radio base station apparatus 101A to the radio base station apparatus 101B. In this case, the offset OST is a parameter held by the radio base station apparatus 101A.

  With reference to FIG. 8 and FIG. 9, first, the radio terminal apparatus 202 measures the received power of the radio signal transmitted from the radio base station apparatus, and sends a measurement result notification indicating the measurement result of the measured received power to the radio base station. Transmit to the station apparatus 101A (step S111).

  Next, based on the measurement result notification received from the wireless terminal device 202, the wireless base station device 101A determines whether or not the wireless terminal device 202 should be handed over. When it is determined that the radio terminal apparatus 202 should be handed over, the radio base station apparatus 101A refers to the neighboring cell information and determines, for example, the radio base station apparatus 101B as a handover destination (step S112).

  Next, the radio base station apparatus 101A transmits a handover request indicating the radio base station apparatus 101B to the radio base station apparatus 101B via the X2 interface that is an inter-base station interface (step S113).

  Next, the radio base station apparatus 101B receives the handover request from the radio base station apparatus 101A, and transmits a handover response to the handover request to the radio base station apparatus 101A via the X2 interface (step S114).

  Next, the radio base station apparatus 101A receives a handover response from the radio base station apparatus 101B, and transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the radio terminal apparatus 202 (step S115).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification to the wireless base station device 101B. (Step S116).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A (step S117).

  Also, the radio base station apparatus 101B starts a timer in order to measure the stay time in the cell CB of the radio terminal apparatus 202 (step S118).

  Next, the wireless base station device 101A receives the terminal information release instruction from the wireless base station device 101B, and releases information (UE Context) on the wireless terminal device 202 (step S119).

  Thus, the handover of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101B is completed (step S120).

  Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101B, the radio terminal apparatus 202 moves outside the cell CB and within the virtual cell CBV and cell CC (step S121).

  Then, the radio terminal apparatus 202 has a large interference of radio signals transmitted from the radio base station apparatus 101C (Other eNB), and cannot communicate with the radio base station apparatus 101B, so that RLF occurs (step S123). .

  Next, when detecting the occurrence of RLF, the wireless terminal device 202 searches for nearby wireless base station devices by measuring the reception power of the wireless signal or the like. In this case, since the reception power of the radio signal from the radio base station apparatus 101C is maximized, the radio terminal apparatus 202 is requested to reestablish an RRC connection reestablishment request (RRC Connection) in order to reconnect to the searched radio base station apparatus 101C. Reestablishment Request) is transmitted to the radio base station apparatus 101C (step S124).

  Next, since the wireless base station device 101C does not hold information (UE Context) regarding the wireless terminal device 202, the wireless base station device 101C cannot accept the RRC connection re-establishment request from the wireless terminal device 202 (step S125). ), RRC connection re-establishment rejection is transmitted to the wireless terminal device 202 (step S126).

  Next, the radio terminal apparatus 202 receives the RRC connection re-establishment rejection from the radio base station apparatus 101C, and starts a normal connection procedure with the radio base station apparatus 101C (step S127).

  That is, first, the wireless terminal device 202 transmits an RRC connection request to the wireless base station device 101C (step S128).

  Next, the wireless base station device 101C receives the RRC connection request from the wireless terminal device 202, and transmits RRC connection information (RRC Connection Setup) to the wireless terminal device 202 (step S129).

  Next, the wireless terminal device 202 receives the RRC connection information from the wireless base station device 101C, and transmits an RRC connection completion notification (RRC Connection Setup Complete) (step S130).

  Next, the wireless base station device 101C receives the RRC connection completion notification from the wireless terminal device 202, and transmits security information (Security Mode Command) to the wireless terminal device 202 (step S131).

  Next, the wireless terminal device 202 receives security information from the wireless base station device 101C, and transmits a security completion notification (Security Mode Complete) to the wireless base station device 101C (step S132).

  Next, the wireless base station device 101C transmits an RRC connection reconfiguration instruction (RRC Connection Reconfiguration) to the wireless terminal device 202 (step S133).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101C. (Step S134).

  Here, the RRC connection completion notification and the RRC connection reconfiguration completion notification include, for example, a parameter “rlf-InfoAvailable”. The wireless terminal device 202 sets this parameter and transmits an RRC connection completion notification and an RRC connection reconfiguration completion notification. Thereby, the radio base station apparatus 101C recognizes that an RLF has occurred in the radio terminal apparatus 202. The wireless base station device 101C transmits a terminal information request (UE Information Request) to the wireless terminal device 202 in order to acquire detailed information of the RLF (step S135).

  Next, the wireless terminal device 202 receives a terminal information request from the wireless base station device 101C, and transmits a terminal information response (UE Information Response) including an RLF report to the wireless base station device 101C (step S136). The RLF report includes the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF occurrence is the ID of the radio base station apparatus 101B, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101C, and the C-RNTI is assigned by the radio base station apparatus 101B ID.

  Next, the radio base station apparatus 101C recognizes that the RLF has occurred in the radio base station apparatus 101B by referring to the PCI indicated by the RLF report received from the radio terminal apparatus 202, and performs “Too Late” to the cell CC. It is determined that “HO” has occurred (step S137).

  Next, the radio base station apparatus 101C transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101B via the X2 interface in order to notify that it is “Too Late HO”. (Step S138).

  Next, when the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101C, the radio base station apparatus 101B checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” to the cell CC, and further, since the RLF notification is received from the radio base station apparatus 101C other than the radio base station apparatus 101A, It is determined that it is not “Too Early HO” but “HO to Wron Cell” to the cell CB. When the radio base station apparatus 101B receives the RLF notification from the radio base station apparatus 101C and the timer is not operating, that is, when the predetermined time has elapsed since the timer was started, the cell CC And “Too Late HO”.

  If the radio base station apparatus 101B determines that it is “HO to Wron Cell” to the cell CB (step S139), it transmits a handover report to the radio base station apparatus 101A (step S140). The handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101B notifies the radio base station apparatus 101A of “HO to Wron Cell” by setting this parameter to a predetermined value.

  Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101B, recognizes that “HO to Wong Cell” has occurred in the cell CB (step S141), and performs “HO to Wong”. The optimization process of the handover operation is executed so that the occurrence of “Cell” is suppressed (step S142).

  In addition to the above “Too Late HO”, “Too Early HO”, and “HO to Wong Cell”, there is “Ping Pong HO” as an inappropriate handover operation.

  This is a case where two radio base station apparatuses determine a handover to another radio base station apparatus for a certain radio terminal apparatus. When this “Ping Pong HO” occurs, the connection between the wireless terminal device and the wireless base station device is not disconnected, but the processing for the handover operation is repeated for the wireless terminal device, and the call and data communication Cannot be performed, and the load on the upper network side increases.

[Control parameters for handover operation]
FIG. 10 is a diagram illustrating a reception quality simulation result of the wireless terminal device in the wireless communication system according to the first embodiment of the present invention.

  FIG. 10 shows RSSI (Received Signal Strength Indication) of the wireless terminal device 202 for 100 seconds until the wireless terminal device 202 passes near the pico base station at a speed of 30 km per hour and passes near the macro base station.

  In FIG. 10, graphs G1 and G3 indicate RSSIs of radio signals transmitted from the macro base station, and graphs G2 and G4 indicate RSSIs of radio signals transmitted from the pico base station. The graphs G1 and G2 take into account the temporal change in the received power of the radio signal in the radio terminal device 202 caused by shadowing, that is, the relative position change between the radio terminal device 202 and other objects. Simulation results, and graphs G3 and G4 are simulation results that do not consider shadowing.

  Referring to FIG. 10, the ideal position for handover from the pico base station to the macro base station of wireless terminal apparatus 202 is the vicinity of the intersection of the graph, that is, the position where the movement time is about 17 seconds. However, in practice, it is difficult to grasp the future communication environment of the wireless terminal device 202 in the wireless communication system. Therefore, it is possible to optimize the handover operation by adjusting the timing of the handover operation based on various measurement results. It is important to make it easier.

  In addition, since the radio signal from each radio base station apparatus is intricate during the movement time of 15 to 20 seconds, for example, “Too Early HO” or “Ping Pong HO” is likely to occur. Also, near the timing at which the moving time is 20 seconds, the received power of the radio signal from the pico base station suddenly decreases, the received power of the radio signal from the macro base station suddenly increases, and SINR (Signal to Interference) Since “-plus-Noise Ratio” deteriorates rapidly, “Too Late HO” is likely to occur.

  Here, if an evaluation function of MRO (Mobility Robustness Optimization) that optimizes handover specified in 3GPP is Y = MRO (X), Y is, for example, the occurrence frequency of “Too Late HO”, “Too Early HO” "Occurrence frequency", "HO to Wrong Cell" occurrence frequency, unnecessary ping occurrence frequency such as "Ping Pong HO", or immediately after transmitting the RRC connection information, that is, the radio terminal apparatus 202 connects to the radio base station apparatus This is the frequency of occurrence of handover immediately after being performed.

  Further, for example, X is a parameter for power measurement processing (Measurement), and hysteresis HS: 0 dB to +15 dB, TTT (Time to Trigger): 0 ms to 5120 ms, or offset OST (Cell Individual Offset): −24 dB to +24 dB It is. Alternatively, X is a parameter for cell reselection processing.

  For example, the hysteresis HS and TTT can be set for each event described later, and the offset OST can be set for each serving cell formed by the serving base station and each neighboring cell.

  Here, it is assumed that, in order to reduce the uplink transmission load of radio terminal apparatus 202, the radio base station apparatus determines handover when receiving a measurement result notification (Measurement Report). That is, the transmission timing of the measurement result notification corresponds to the handover timing.

  Hereinafter, the relationship between various events for transmitting the measurement result notification and the parameters of the power measurement process will be described.

  FIG. 11 is a diagram illustrating an event A1 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. In FIG. 11, the horizontal axis is time, the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202, and the SVC is the reception power or SINR of the serving cell, that is, the reception power of the radio signal transmitted by the serving base station or SINR.

  Referring to FIG. 11, at event A1, hysteresis HS is set in a positive or negative direction with respect to threshold value Th.

  When the reception power or SINR of the serving cell becomes larger than (Th + HS), the wireless terminal device 202 transitions to the report on state (timing T1).

  Then, when TTT elapses from timing T1 in a state where the condition that the received power or SINR is larger than (Th-HS) is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T2).

  Next, when TTT elapses from timing T2 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T3).

  Next, when the condition is not satisfied before TTT elapses from timing T3, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T4).

  Here, the wireless terminal device 202 performs power measurement processing periodically, for example, regardless of the transition between the report-on state and the report-off state, and transmits the latest measurement result as a measurement result notification. Further, for example, radio terminal apparatus 202 performs transition between the report-on state and the report-off state independently for each of received power and SINR. That is, the wireless terminal device 202 transmits a measurement result notification if a condition is satisfied for one of the received power and SINR.

  FIG. 12 is a diagram illustrating an event A2 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. The way of viewing the figure is the same as in FIG.

  Referring to FIG. 12, at event A2, hysteresis HS is set in a positive or negative direction with respect to threshold value Th.

  When the reception power or SINR of the serving cell becomes smaller than (Th-HS), the wireless terminal device 202 transitions to the report on state (timing T11).

  Then, when TTT elapses from timing T11 in a state where the condition that the received power or SINR is smaller than (Th + HS) is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T12).

  Next, when TTT elapses from timing T12 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T13).

  Next, when the condition is not satisfied before TTT elapses from timing T13, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T14).

  FIG. 13 is a diagram illustrating an event A3 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. In FIG. 13, the horizontal axis is time, the vertical axis is the reception power or SINR of the radio signal in the wireless terminal device 202, SVC is the reception power or SINR of the serving cell, and NBC is the reception power or SINR of the neighboring cell, that is, This is the reception power or SINR of a radio signal transmitted by a neighboring base station.

  Referring to FIG. 13, at event A3, offset OST1 is set in the positive direction with respect to the reception power or SINR of the serving cell, and hysteresis HS is set in the positive and negative directions. Also, the offset OST2 is set in the positive direction with respect to the reception power or SINR of the neighboring cells.

  When {(reception power or SINR of neighboring cells) + OST2} becomes larger than {(reception power or SINR of serving cell) + OST1 + HS}, the wireless terminal device 202 transitions to a report-on state (timing T21).

  Then, the wireless terminal device 202 performs the processing from timing T21 to TTT in a state where {(neighboring cell received power or SINR) + OST2} is larger than {(serving cell received power or SINR) + OST1-HS}. When the time has elapsed, a measurement result notification is transmitted (timing T22).

  Next, when TTT elapses from timing T22 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T23).

  Next, when the condition is not satisfied before TTT elapses from timing T23, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T24).

  FIG. 14 is a diagram illustrating an event A4 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. The way of viewing the figure is the same as in FIG.

  Referring to FIG. 14, at event A4, offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cells, and hysteresis HS is set in the positive and negative directions with respect to threshold value Th.

  When {(reception power or SINR of the neighboring cell) + OST} becomes larger than (Th + HS), the wireless terminal device 202 transitions to a report-on state (timing T31).

  The wireless terminal device 202 transmits a measurement result notification when TTT elapses from the timing T31 in a state where {(peripheral cell received power or SINR) + OST} is larger than (Th−HS). (Timing T32).

  Next, when TTT elapses from timing T32 in a state where the condition is satisfied, the wireless terminal device 202 transmits a measurement result notification (timing T33).

  Next, when the condition is not satisfied before TTT elapses from timing T33, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T34).

  FIG. 15 is a diagram illustrating an event A5 in which the wireless terminal device transmits a measurement result notification in the wireless communication system according to the first embodiment of the present invention. The way of viewing the figure is the same as in FIG.

  Referring to FIG. 15, at event A5, the offset OST is set in the positive direction with respect to the reception power or SINR of the neighboring cell, and the hysteresis HS1 is set in the positive and negative direction with respect to the threshold Th1. Hysteresis HS2 is set in the positive and negative directions with respect to Th2.

  When the received power or SINR of the serving cell becomes smaller than (Th1-HS1) and {(reception power or SINR of the neighboring cell) + OST} becomes larger than (Th2 + HS2), the wireless terminal device 202 transitions to the report-on state. (Timing T41).

  The wireless terminal apparatus 202 satisfies the condition that the reception power or SINR of the serving cell is smaller than (Th1 + HS1) and {(reception power or SINR of the neighboring cell) + OST} is larger than (Th2-HS2). When TTT elapses from timing T41 in a state where it is in a measured state, a measurement result notification is transmitted (timing T42).

  Next, when the condition is not satisfied before TTT elapses from timing T42, the wireless terminal device 202 does not transmit a measurement result notification and transitions to a report off state (timing T43).

  As described above, the timing of the handover operation of the wireless terminal apparatus 202 can be controlled by adjusting the parameters described in the events A1 to A5, that is, the hysteresis HS, TTT, and the offset OST.

  FIG. 16 is a diagram illustrating timing control of the handover operation by adjusting the hysteresis HS in the wireless communication system according to the first embodiment of the present invention. FIG. 16 shows the case of event A3.

  Referring to FIG. 16, when hysteresis HS is set to zero, a transition is made to the report on state at timing T51, a measurement result notification is transmitted at timing T53, and a transition to the report off state is made at timing T55.

  On the other hand, when the hysteresis HS is set to be greater than zero, the state transits to the report on state at a timing T52 after the timing T51, and a measurement result notification is transmitted at a timing T54 after the timing T53. At a later timing T56, the state transits to the report off state.

  That is, if the hysteresis HS is increased, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed.

  FIG. 17 is a diagram illustrating timing control of the handover operation by adjusting the TTT in the wireless communication system according to the first embodiment of the present invention. FIG. 17 shows the case of event A3.

  Referring to FIG. 17, when TTT is set to be small, a measurement result notification is transmitted at timing T62.

  On the other hand, when TTT is set large, a measurement result notification is transmitted at timing T63 after timing T61.

  That is, if the TTT is increased, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed.

  FIG. 18 is a diagram illustrating timing control of the handover operation by adjusting the offset OST in the wireless communication system according to the first embodiment of the present invention. FIG. 18 shows the case of event A3.

  Referring to FIG. 18, when offset OST is set to zero, a transition is made to the report on state at timing T71, a measurement result notification is transmitted at timing T73, and a transition to the report off state is made at timing T76.

  On the other hand, when the offset OST is set to be smaller than zero, the state transits to the report on state at timing T72 after timing T71, the measurement result notification is transmitted at timing T74 after timing T73, and timing T76. Transition to the report-off state at an earlier timing T75.

  That is, if the offset OST is reduced, the transmission timing of the measurement result notification, that is, the timing of the handover operation can be delayed. Further, the transition from the report off state to the report on state is delayed, and the transition from the report on state to the report off state is accelerated.

  As described above, the timing of the handover operation is delayed by increasing the hysteresis HS, increasing the TTT, or decreasing the offset OST. That is, since the time for which the wireless terminal device 202 is connected to the serving base station becomes longer, the occurrence frequency of “Too Early HO”, “HO to Wong Cell” and “Ping Pong HO” is reduced, and “Too Late HO” The frequency of occurrence will increase.

  Here, the difference in the effect of adjusting the hysteresis HS, TTT, and offset OST will be considered.

  Even if any parameter is adjusted, the timing of handover can be adjusted, but these effects differ depending on the terrain including interference, the moving speed of the wireless terminal device, and the like.

  Adjusting the hysteresis HS and the offset OST corresponds to adjusting the position where the handover is performed by virtually increasing or decreasing the cell. For example, by increasing the hysteresis HS of the serving cell, the received power of the radio signal is increased and the handover to another cell is difficult to be performed. Also, by setting the offset OST of the neighboring cell to a negative value, the received power of the radio signal from the neighboring cell appears to be small, and handover to another cell is difficult to be performed.

  The hysteresis HS and the offset OST are parameters that are not easily influenced by the moving speed of the wireless terminal device.

  Here, in the measurement start request (Measurement Configuration) and the RRC connection reconfiguration instruction (RRC Connection Reconfiguration) transmitted from the radio base station apparatus to the radio terminal apparatus 202, for example, an offset OST is set for each neighboring cell, and the event At least one of A1 to A5 is set, and hysteresis HS and TTT corresponding to the set event are set.

[Radio base station equipment]
FIG. 19 is a diagram illustrating a configuration of the radio base station apparatus according to the first embodiment of the present invention.
Referring to FIG. 19, radio base station apparatus 101 includes an antenna 91, a circulator 92, a radio reception unit 93, a radio transmission unit 94, a signal processing unit 95, and a control unit 98. The signal processing unit 95 includes a reception signal processing unit 96 and a transmission signal processing unit 97. The signal processing unit 95 and the control unit 98 are realized by a CPU (Central Processing Unit) or a DSP (Digital Signal Processor).

  The circulator 92 outputs the radio signal from the radio terminal device 202 received by the antenna 91 to the radio reception unit 93 and outputs the radio signal received from the radio transmission unit 94 to the antenna 91.

  Radio receiving section 93 converts the radio signal received from circulator 92 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to received signal processing section 96.

  The received signal processing unit 96 performs signal processing such as despreading in the CDMA (Code Division Multiple Access) method on the digital signal received from the wireless receiving unit 93, and part or all of the digital signal after this signal processing is performed. It is converted into a predetermined frame format and transmitted to the core network side.

  The transmission signal processing unit 97 performs IFFT (Inverse Fast Fourier Transform) in an OFDM (Orthogonal Frequency Division Multiplex) method on communication data obtained by converting communication data received from the core network side into a predetermined frame format or communication data generated by itself. The digital signal after the signal processing is output to the wireless transmission unit 94.

  The radio transmission unit 94 converts the digital signal received from the transmission signal processing unit 97 into an analog signal, converts the frequency of the converted analog signal into a radio signal, and outputs the radio signal to the circulator 92.

  The control unit 98 exchanges various types of information with each unit and the core network in the radio base station apparatus 101.

  3 to 9, the inappropriate handover operation and its detection process have been described. In these detection processes, an inappropriate handover operation is detected by exchanging information between the radio base station apparatuses via the X2 interface.

  However, in a wireless communication system, a wireless base station device having an X2 interface is not always provided, and information may not be exchanged between the wireless base station devices. Even in such a case, a configuration capable of detecting an inappropriate handover operation is desired.

  Therefore, in the radio communication system according to the first embodiment of the present invention, “Too Early HO” and “Ping Pong HO” can be detected by a single radio base station apparatus by the following operation.

[Too Early HO detection process]
Here, the operation when the radio base station apparatus according to the first embodiment of the present invention performs the “Too Early HO” detection process will be described in detail.

  FIG. 20 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Too Early HO” detection process.

  Referring to FIG. 20, in this example, the radio base station apparatus gives terminal identification information such as C-RNTI to radio terminal apparatus 202 that selects itself as a communication destination. First, similarly to the handover operation illustrated in FIG. 2, after the radio base station device 101A determines the radio base station device 101B as the handover destination, the radio base station device 101A includes an RRC including a handover instruction to the radio base station device 101B. A connection reconfiguration instruction is transmitted to the wireless terminal device 202 (step S201).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S202).

  Here, the radio terminal apparatus 202 holds the ECGI of the radio base station apparatus 101A that is the handover source and the C-RNTI assigned from the radio base station apparatus 101A (step S203).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the higher-level apparatus (steps S204 and S205).

  Next, the radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, but holds information (UE Context) on the radio terminal apparatus 202 such as C-RNTI without releasing it (step S206). ).

  Next, the radio base station apparatus 101A starts a timer for measuring the elapsed time from the handover operation of the radio terminal apparatus 202 to the radio base station apparatus 101B (step S207). The wireless base station device 101A can measure the elapsed time for each wireless terminal device 202.

  Next, the wireless terminal device 202 cannot communicate with the wireless base station device 101B, and RLF is generated (step S209).

  Next, when RLF occurs, the wireless terminal device 202 searches for a wireless base station device to be a communication destination. More specifically, the radio terminal apparatus 202 measures the received power of radio signals transmitted from the radio base station apparatus corresponding to the cell in which the RLF has occurred and the radio base station apparatus corresponding to the neighboring cell. And the radio | wireless terminal apparatus 202 selects the radio base station apparatus which should be a communication destination based on a measurement result (step S210).

  Next, when it is determined that the wireless base station device 101A should be selected as the communication destination, the wireless terminal device 202 transmits the stored ECGI and C-RNTI (step S211), that is, the information about them. Is transmitted in the RRC connection re-establishment request to the radio base station apparatus 101A (step S212).

  Next, the radio base station apparatus 101A receives the RRC connection re-establishment request from the radio terminal apparatus 202, confirms the timer that has been started, and the ECGI indicated by the RLF report included in the RRC connection re-establishment request. Comparison is made with its own ECGI, and C-RNTI indicated by the RLF report is compared with C-RNTI assigned by itself. The radio base station apparatus 101A detects “Too Early HO” from the cell CA to the cell CB when the value of the timer is less than the predetermined threshold and both the ECGI and the C-RNTI match. . For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Too Early HO” (step S213).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so that the occurrence of “Too Early HO” in the cell CB is suppressed (step S214). Note that the wireless base station device 101A can communicate with the wireless terminal device 202 using the information related to the wireless terminal device 202 that has been held without being released.

  In addition, when the value of the timer exceeds a predetermined threshold, the radio base station device 101A releases the information related to the held radio terminal device 202 (step S208).

  In addition, when the radio terminal apparatus 202 notifies ECGI and C-RNTI to the radio base station apparatus, or after a predetermined time has elapsed from the timing of the handover operation to its own radio base station apparatus 101B, the held ECGI and C-RNTI Is deleted (step S215).

  As described above, in the example illustrated in FIG. 20, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  When the radio terminal apparatus 202 resumes communication with the radio base station apparatus due to the occurrence of RLF or the like after completion of the handover operation to the radio base station apparatus 101B, for example, when performing a reconnection operation to the radio base station apparatus In this case, the stored base station identification information and terminal identification information are notified to the reconnection destination radio base station apparatus, in the above example, the radio base station apparatus 101A.

  Upon receiving the above notification from the wireless terminal device 202, the wireless base station device 101A matches the base station identification information notified from the wireless terminal device 202 with its own identification information, and the terminal identification notified from the wireless terminal device 202 When the information matches the terminal identification information given by itself and the elapsed time is less than the predetermined value, the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is not possible. Judge that it was appropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  In addition, the wireless base station device 101A holds the terminal identification information given to the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the elapsed time exceeds the predetermined value, the terminal identification information is deleted.

  FIG. 21 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Too Early HO” detection process.

  Referring to FIG. 21, the operations in steps S341 to S350 are the same as the operations in steps S201 to S210 shown in FIG.

  Next, when determining that the wireless base station device 101A should be selected as the communication destination, the wireless terminal device 202 acquires the ECGI of the wireless base station device 101A (step S351).

  Next, the wireless terminal device 202 compares the acquired ECGI with the held ECGI. If both ECGIs match, the wireless terminal device 202 transmits the stored C-RNTI (step S352), that is, includes an RLF report indicating this information in the RRC connection re-establishment request, It transmits to the station apparatus 101A (step S353).

  Next, the radio base station apparatus 101A receives the RRC connection re-establishment request from the radio terminal apparatus 202, confirms the timer that has been started, and the C-L indicated by the RLF report included in the RRC connection re-establishment request. The RNTI is compared with the C-RNTI assigned by itself. The radio base station apparatus 101A detects “Too Early HO” from the cell CA to the cell CB when the value of the timer is less than the predetermined threshold and both C-RNTIs match. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Too Early HO” (step S354).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so that the occurrence of “Too Early HO” in the cell CB is suppressed (step S355). Note that the wireless base station device 101A can communicate with the wireless terminal device 202 using the information related to the wireless terminal device 202 that has been held without being released.

  Also, when the value of the timer exceeds a predetermined threshold, the radio base station device 101A releases the information related to the held radio terminal device 202 (step S348).

  Also, the wireless terminal device 202 deletes the held ECGI and C-RNTI when the C-RNTI is notified to the wireless base station device or after a predetermined time has elapsed from the timing of the handover operation to the wireless base station device 101B. (Step S356).

  As described above, in the example illustrated in FIG. 21, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  When the radio terminal apparatus 202 resumes communication with the radio base station apparatus due to the occurrence of RLF or the like after completion of the handover operation to the radio base station apparatus 101B, for example, when performing a reconnection operation to the radio base station apparatus If the base station identification information of the held radio base station apparatus 101A matches the base station identification information of the radio base station apparatus newly selected as the communication destination, the held terminal identification information is changed to the reconnection destination radio. The base station apparatus, in the above example, is notified to the radio base station apparatus 101A.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the terminal identification information provided by itself, and the elapsed time is a predetermined value. If it is less than this, it is determined that the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  In addition, the wireless base station device 101A holds the terminal identification information given to the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the elapsed time exceeds the predetermined value, the terminal identification information is deleted.

  FIG. 22 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Too Early HO” detection process.

  22, first, similarly to the handover operation shown in FIG. 2, after the radio base station apparatus 101A determines the radio base station apparatus 101B as the handover destination, the radio base station apparatus 101A An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S161).

  Next, the wireless terminal device 202 starts a timer for measuring the elapsed time from the handover operation to its own wireless base station device 101B (step S162).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S163). Note that the wireless terminal device 202 may start the timer after transmitting the RRC connection reconfiguration completion notification.

  Here, the wireless terminal device 202 holds the ECGI of the wireless base station device 101A that is the handover source (step S164).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the host apparatus. The radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (steps S165 and S166).

  Next, the wireless terminal device 202 cannot communicate with the wireless base station device 101B, and RLF is generated (step S167).

  Next, when RLF occurs, the wireless terminal device 202 searches for a wireless base station device to be a communication destination. More specifically, the radio terminal apparatus 202 measures the received power of radio signals transmitted from the radio base station apparatus corresponding to the cell in which the RLF has occurred and the radio base station apparatus corresponding to the neighboring cell. Then, the wireless terminal device 202 selects a wireless base station device to be a communication destination based on the measurement result (step S168).

  Next, when determining that the radio base station apparatus 101A should be selected as the communication destination, the radio terminal apparatus 202 acquires the ECGI of the radio base station apparatus 101A (step S169).

  Next, the wireless terminal device 202 checks the timer that has been started, and compares the acquired ECGI with the held ECGI. If the value of the timer is less than a predetermined threshold value and the two ECGIs match, the wireless terminal device 202 uses the predetermined information, specifically, the wireless base station device 101A as a communication destination until a short time ago. Information indicating that it has been selected is transmitted (step S170). That is, the radio terminal apparatus 202 includes an RLF report indicating predetermined information in the RRC connection re-establishment request and transmits the RLF report to the radio base station apparatus 101A (step S171). This predetermined information includes, for example, a timer value.

  Next, since the radio base station apparatus 101A receives the RRC connection re-establishment request from the radio terminal apparatus 202 and the RRC connection re-establishment request includes predetermined information, the radio base station apparatus 101A transmits the RRC connection re-establishment request from the cell CA to the cell CB. “Too Early HO” is detected. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Too Early HO” (step S172).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so that the occurrence of “Too Early HO” in the cell CB is suppressed (step S173).

  Further, when the wireless terminal device 202 notifies the wireless base station device of the predetermined information, or when the elapsed time becomes equal to or greater than the predetermined value, the wireless terminal device 202 deletes the held ECGI (step S174).

  As described above, in the example illustrated in FIG. 22, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, when the radio terminal apparatus 202 resumes communication with the radio base station apparatus due to the occurrence of RLF or the like, for example, the radio terminal apparatus 202 performs a reconnection operation to the radio base station apparatus. When performing, when the stored base station identification information of the radio base station apparatus 101A matches the base station identification information of the radio base station apparatus newly selected as the communication destination, and the elapsed time is less than a predetermined value , The predetermined information is notified to the reconnection destination radio base station apparatus, in the above example, the radio base station apparatus 101A.

  Upon receiving the notification including the predetermined information from the wireless terminal device 202, the wireless base station device 101A determines that the handover operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is inappropriate. To do. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  FIG. 23 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs “Too Early HO” detection processing.

  Referring to FIG. 23, first, similarly to the handover operation shown in FIG. 2, after radio base station apparatus 101A determines radio base station apparatus 101B as a handover destination, radio base station apparatus 101A An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S181).

  Next, the wireless terminal device 202 starts a timer for measuring the elapsed time from the handover operation to its own wireless base station device 101B (step S182).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S183). Note that the wireless terminal device 202 may start the timer after transmitting the RRC connection reconfiguration completion notification.

  Here, the wireless terminal device 202 holds the ECGI of the wireless base station device 101A that is the handover source (step S184).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the host apparatus. The radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (steps S185 and S186).

  Next, the wireless terminal device 202 cannot communicate with the wireless base station device 101B, and RLF is generated (step S187).

  Next, when RLF occurs, the wireless terminal device 202 searches for a wireless base station device to be a communication destination. More specifically, the radio terminal apparatus 202 measures the received power of radio signals transmitted from the radio base station apparatus corresponding to the cell in which the RLF has occurred and the radio base station apparatus corresponding to the neighboring cell. Then, the wireless terminal device 202 selects a wireless base station device to be a communication destination based on the measurement result (step S188).

  Next, when the wireless terminal device 202 determines that the wireless base station device 101A should be selected as a communication destination, the wireless terminal device 202 checks the timer that has been started, and if the value of the timer is less than a predetermined threshold value Transmits the held ECGI (step S189). That is, the radio terminal apparatus 202 includes the RLF report indicating the ECGI of the radio base station apparatus 101A in the RRC connection re-establishment request and transmits the RLF report to the radio base station apparatus 101A (step S190). This RLF report includes a timer value, for example.

  Next, the radio base station apparatus 101A receives the RRC connection re-establishment request from the radio terminal apparatus 202, compares the ECGI indicated by the RLF report included in the RRC connection re-establishment request with its own ECGI, Since they match, “Too Early HO” from the cell CA to the cell CB is detected. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Too Early HO” (step S191).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so that the occurrence of “Too Early HO” in the cell CB is suppressed (step S192).

  In addition, when the radio terminal apparatus 202 notifies the radio base station apparatus of ECGI or when the elapsed time becomes equal to or greater than the predetermined value, the radio terminal apparatus 202 deletes the held ECGI (step S193).

  As described above, in the example illustrated in FIG. 23, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, when the radio terminal apparatus 202 resumes communication with the radio base station apparatus due to the occurrence of RLF or the like, for example, the radio terminal apparatus 202 performs a reconnection operation to the radio base station apparatus. When performing, if the elapsed time is less than the predetermined value, the stored base station identification information is notified to the reconnection-destination radio base station apparatus, in the above example, the radio base station apparatus 101A.

  The wireless base station device 101A receives the above notification from the wireless terminal device 202, and when the base station identification information notified from the wireless terminal device 202 matches its own identification information, the wireless base station device 101A It is determined that the handover operation from the station apparatus 101A to the radio base station apparatus 101B is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  FIG. 24 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Too Early HO” detection process.

  Referring to FIG. 24, first, similarly to the handover operation shown in FIG. 2, after radio base station apparatus 101A determines radio base station apparatus 101B as a handover destination, radio base station apparatus 101A performs radio base station apparatus 101B. An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S221).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S222).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the higher-level apparatus (steps S223 and S224).

  Next, the wireless base station device 101A receives the terminal information release instruction from the wireless base station device 101B. For example, when starting communication with the wireless terminal device 202, the wireless base station device 101A acquires the wireless terminal device 202 obtained from the wireless terminal device 202. The unique ID is retained. Alternatively, the wireless base station device 101A acquires the unique ID of the wireless terminal device 202 from the host device and holds it (step S225). The wireless base station device 101A can uniquely identify the wireless terminal device 202 by this unique ID.

  Next, the radio base station apparatus 101A starts a timer for measuring the elapsed time from the handover operation of the radio terminal apparatus 202 to the radio base station apparatus 101B (step S226). The wireless base station device 101A can measure the elapsed time for each wireless terminal device 202.

  Next, the wireless terminal device 202 cannot communicate with the wireless base station device 101B, and RLF is generated (step S228).

  Next, when RLF occurs, the wireless terminal device 202 searches for a wireless base station device to be a communication destination. More specifically, the radio terminal apparatus 202 measures the received power of radio signals transmitted from the radio base station apparatus corresponding to the cell in which the RLF has occurred and the radio base station apparatus corresponding to the neighboring cell. Then, the wireless terminal device 202 selects a wireless base station device to be a communication destination based on the measurement result (step S229).

  Next, when determining that the wireless base station device 101A should be selected as the communication destination, the wireless terminal device 202 transmits its own unique ID (step S230), that is, sends an RLF report indicating the unique ID to the RRC connection. It is included in the re-establishment request and transmitted to the radio base station apparatus 101A (step S231).

  Next, the radio base station apparatus 101A receives the RRC connection re-establishment request from the radio terminal apparatus 202, confirms the timer that has been started, and the unique ID indicated by the RLF report included in the RRC connection re-establishment request And the stored unique ID are compared. The radio base station apparatus 101A detects “Too Early HO” from the cell CA to the cell CB when the value of the timer is less than the predetermined threshold value and the two unique IDs match. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Too Early HO” (step S232).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so that the occurrence of “Too Early HO” in the cell CB is suppressed (step S233).

  In addition, when the value of the timer exceeds a predetermined threshold, the radio base station apparatus 101A releases the held unique ID (step S227).

  In this way, in the example shown in FIG. 24, the radio base station apparatus 101A obtains the terminal identification information, that is, the unique ID of the radio terminal apparatus 202 that selects itself as the communication destination from an apparatus other than itself, such as the radio terminal apparatus 202 or the host apparatus get. Also, the radio base station apparatus 101A measures the elapsed time from the timing of the handover operation to the radio base station apparatus 101B of the radio terminal apparatus 202 that has selected itself as the communication destination.

  When the radio terminal apparatus 202 resumes communication with the radio base station apparatus due to the occurrence of RLF or the like after completion of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B, for example, for the radio base station apparatus When the reconnection operation is performed, its own terminal identification information is notified to the reconnection destination radio base station apparatus, in the above example, the radio base station apparatus 101A.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the acquired terminal identification information, and the elapsed time is less than a predetermined value. In some cases, it is determined that the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  Also, the wireless base station device 101A retains the terminal identification information of the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the time exceeds the predetermined value, the terminal identification information is deleted.

  FIG. 25 is a diagram illustrating an example of an RLF report transmitted by the wireless terminal device in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 25, this RLF report includes the result of the power measurement process performed last for each serving cell formed by the serving base station by wireless terminal apparatus 202 and each neighboring cell. The result of this power measurement process is, for example, the received power of a radio signal from the serving base station or SINR (Signal to Interference-plus-Noise Ratio).

  Also, the RLF report shows the EGCI, carrier frequency, PCI of the radio base station apparatus selected as the communication destination when RLF occurs, and the stay time of the radio terminal apparatus 202 in the cell formed by the radio base station apparatus. Including. This staying time is a timer value in the wireless terminal device 202 described above.

  Further, the RLF report includes the EGCI of the radio base station apparatus that is the last handover source of the radio terminal apparatus 202, the C-RNTI assigned from the radio base station apparatus, and the radio in the cell formed by the radio base station apparatus. The stay time of the terminal device 202 is included.

  The RLF report includes the unique ID of the wireless terminal device 202. 20 to 24, the RLF report does not have to include unused information.

  With the configuration in which the C-RNTI or the unique ID is notified to the radio base station apparatus, the radio base station apparatus can identify the radio terminal apparatus that is the notification source of the C-RNTI or the unique ID. Therefore, for example, CQI (Channel Quality Indication) ) And the like, it is possible to perform more accurate handover control and further optimize the handover operation.

[Ping Pong HO detection process]
Next, the operation when the radio base station apparatus according to the first embodiment of the present invention performs the “Ping Pong HO” detection process will be described in detail.

  FIG. 26 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Ping Pong HO” detection process.

  Referring to FIG. 26, in this example, the radio base station apparatus gives terminal identification information such as C-RNTI to radio terminal apparatus 202 that selects itself as a communication destination. First, similarly to the handover operation illustrated in FIG. 2, after the radio base station device 101A determines the radio base station device 101B as the handover destination, the radio base station device 101A includes an RRC including a handover instruction to the radio base station device 101B. A connection reconfiguration instruction is transmitted to the wireless terminal device 202 (step S301).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S302).

  Here, the radio terminal apparatus 202 holds the ECGI of the radio base station apparatus 101A that is the handover source and the C-RNTI assigned from the radio base station apparatus 101A (step S303).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the higher-level apparatus (steps S304 and S305).

  Next, the radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, but holds information (UE Context) on the radio terminal apparatus 202 such as C-RNTI without releasing it (step S306). ).

  Next, the radio base station apparatus 101A starts a timer for measuring the elapsed time from the handover operation of the radio terminal apparatus 202 to the radio base station apparatus 101B (step S307). The wireless base station device 101A can measure the elapsed time for each wireless terminal device 202.

  Next, the radio base station apparatus 101B determines the radio base station apparatus 101A as a handover destination, and transmits an RRC connection reconfiguration instruction including a handover instruction to the radio base station apparatus 101A to the radio terminal apparatus 202 (step S308). .

  Next, the wireless terminal device 202 receives the RRC connection reconfiguration instruction from the wireless base station device 101B, and transmits the stored ECGI and C-RNTI to the handover destination wireless base station device (step S310). That is, a PingPong report indicating these pieces of information is included in the RRC connection reconfiguration completion notification and transmitted to the radio base station apparatus 101A (step S311).

  Next, the radio base station apparatus 101A receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, confirms the started timer, and indicates the PingPong report included in the RRC connection reconfiguration completion notification The ECGI is compared with its own ECGI, and the C-RNTI indicated by the PingPong report is compared with the C-RNTI assigned by itself. The radio base station apparatus 101A detects “Ping Pong HO” between the cell CA and the cell CB when the value of the timer is less than the predetermined threshold and both the ECGI and the C-RNTI match. . For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Ping Pong HO” (step S312).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so as to suppress the occurrence of “Ping Pong HO” between the cell CA and the cell CB (step S313). Note that the wireless base station device 101A can communicate with the wireless terminal device 202 using the information related to the wireless terminal device 202 that has been held without being released.

  Also, when the value of the timer exceeds a predetermined threshold, the radio base station device 101A releases the information related to the held radio terminal device 202 (step S309).

  In addition, when the radio terminal apparatus 202 notifies ECGI and C-RNTI to the radio base station apparatus, or after a predetermined time has elapsed from the timing of the handover operation to its own radio base station apparatus 101B, the held ECGI and C-RNTI Is deleted (step S314).

  As described above, in the example illustrated in FIG. 26, the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B among the plurality of radio base station apparatuses in the radio communication system. The base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  When the wireless terminal device 202 newly performs a handover operation to the wireless base station device after completing the handover operation to the wireless base station device 101B, the wireless terminal device 202 uses the stored base station identification information and terminal identification information as the handover destination wireless device. The base station apparatus, in the above example, is notified to the radio base station apparatus 101A.

  Upon receiving the above notification from the wireless terminal device 202, the wireless base station device 101A matches the base station identification information notified from the wireless terminal device 202 with its own identification information, and the terminal identification notified from the wireless terminal device 202 When the information matches the terminal identification information given by itself and the elapsed time is less than the predetermined value, the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is not possible. Judge that it was appropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  In addition, the wireless base station device 101A holds the terminal identification information given to the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the elapsed time exceeds the predetermined value, the terminal identification information is deleted.

  FIG. 27 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Ping Pong HO” detection process.

  Referring to FIG. 27, the operations in steps S361 to S369 are the same as the operations in steps S301 to S309 shown in FIG.

  Next, the wireless terminal device 202 receives the RRC connection reconfiguration instruction from the wireless base station device 101B, and acquires the ECGI of the wireless base station device 101A that is the handover destination (step S370).

  Next, the wireless terminal device 202 compares the acquired ECGI with the held ECGI. If both ECGIs match, the radio terminal apparatus 202 transmits the stored C-RNTI to the handover destination radio base station apparatus (step S371), that is, sends a PingPong report indicating these pieces of information to the RRC. It is included in the connection reconfiguration completion notification and transmitted to the radio base station apparatus 101A (step S372).

  Next, the radio base station apparatus 101A receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, confirms the started timer, and indicates the PingPong report included in the RRC connection reconfiguration completion notification The C-RNTI is compared with the C-RNTI assigned by itself. The radio base station apparatus 101A detects “Ping Pong HO” between the cell CA and the cell CB when the value of the timer is less than the predetermined threshold and both C-RNTIs match. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Ping Pong HO” (step S373).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so as to suppress the occurrence of “Ping Pong HO” between the cell CA and the cell CB (step S374). Note that the wireless base station device 101A can communicate with the wireless terminal device 202 using the information related to the wireless terminal device 202 that has been held without being released.

  Also, when the value of the timer exceeds a predetermined threshold, the radio base station device 101A releases the information related to the held radio terminal device 202 (step S369).

  Also, the wireless terminal device 202 deletes the held ECGI and C-RNTI when the C-RNTI is notified to the wireless base station device or after a predetermined time has elapsed from the timing of the handover operation to the wireless base station device 101B. (Step S375).

  As described above, in the example illustrated in FIG. 27, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  Radio terminal apparatus 202 performs a new handover operation to radio base station apparatus after the completion of the handover operation to radio base station apparatus 101B. The radio terminal apparatus 202 newly performs the handover operation to radio base station apparatus 101A. When the base station identification information of the radio base station apparatus selected as the communication destination matches, the held terminal identification information is notified to the handover destination radio base station apparatus, in the above example, the radio base station apparatus 101A.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the terminal identification information provided by itself, and the elapsed time is a predetermined value. If it is less than this, it is determined that the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  In addition, the wireless base station device 101A holds the terminal identification information given to the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the elapsed time exceeds the predetermined value, the terminal identification information is deleted.

  FIG. 28 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Ping Pong HO” detection process.

  Referring to FIG. 28, first, similarly to the handover operation shown in FIG. 2, after radio base station apparatus 101A determines radio base station apparatus 101B as a handover destination, radio base station apparatus 101A An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S241).

  Next, the wireless terminal device 202 starts a timer for measuring the elapsed time from the handover operation to its own wireless base station device 101B (step S242).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S243).

  Here, the wireless terminal device 202 holds the ECGI of the wireless base station device 101A that is the handover source (step S244).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the host apparatus. The radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (steps S245 and S246).

  Next, the radio base station apparatus 101B determines the radio base station apparatus 101A as a handover destination, and transmits an RRC connection reconfiguration instruction including a handover instruction to the radio base station apparatus 101A to the radio terminal apparatus 202 (step S247). .

  Next, the wireless terminal device 202 receives the RRC connection reconfiguration instruction from the wireless base station device 101B, and acquires the ECGI of the wireless base station device 101A that is the handover destination (step S248).

  Next, the wireless terminal device 202 checks the timer that has been started, and compares the acquired ECGI with the held ECGI. If the value of the timer is less than a predetermined threshold value and the two ECGIs match, the wireless terminal device 202 uses the predetermined information, specifically, the wireless base station device 101A as a communication destination until a short time ago. Information indicating that it has been selected is transmitted (step S249). That is, the wireless terminal device 202 includes a PingPong report indicating predetermined information in the RRC connection reconfiguration completion notification and transmits it to the wireless base station device 101A (step S250).

  Next, since the radio base station apparatus 101A receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and the RRC connection reconfiguration completion notification includes predetermined information, the radio base station apparatus 101A is connected between the cell CA and the cell CB. "Ping Pong HO" is detected. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Ping Pong HO” (step S251).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so as to suppress the occurrence of “Ping Pong HO” between the cell CA and the cell CB (step S252).

  In addition, when the wireless terminal device 202 notifies the wireless base station device of the predetermined information, or when the elapsed time exceeds the predetermined value, the wireless terminal device 202 deletes the held ECGI (step S253).

  As described above, in the example illustrated in FIG. 28, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, the radio terminal apparatus 202 newly starts the handover operation to the radio base station apparatus, and the newly stored base station identification information of the radio base station apparatus 101A and the new If the base station identification information of the radio base station apparatus to be selected as the communication destination matches and the elapsed time is less than the predetermined value, the predetermined information is notified to the handover destination radio base station apparatus.

  Upon receiving the notification including the predetermined information from the wireless terminal device 202, the wireless base station device 101A determines that the handover operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is inappropriate. To do. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  FIG. 29 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs the “Ping Pong HO” detection process.

  Referring to FIG. 29, first, similarly to the handover operation shown in FIG. 2, after radio base station apparatus 101A determines radio base station apparatus 101B as a handover destination, radio base station apparatus 101A An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S261).

  Next, the wireless terminal device 202 starts a timer for measuring the elapsed time from the handover operation to its own wireless base station device 101B (step S262).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S263).

  Here, the radio terminal apparatus 202 holds the ECGI of the radio base station apparatus 101A that is the handover source (step S264).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the host apparatus. The radio base station apparatus 101A receives the terminal information release instruction from the radio base station apparatus 101B, and releases information (UE Context) regarding the radio terminal apparatus 202 (steps S265 and S266).

  Next, the radio base station apparatus 101B determines the radio base station apparatus 101A as a handover destination, and transmits an RRC connection reconfiguration instruction including a handover instruction to the radio base station apparatus 101A to the radio terminal apparatus 202 (step S267). .

  Next, the radio terminal apparatus 202 receives the RRC connection reconfiguration instruction from the radio base station apparatus 101B, confirms the timer that has been started, and if the value of the timer is less than a predetermined threshold value, The held ECGI is transmitted to the handover destination radio base station apparatus (step S268). That is, the radio terminal apparatus 202 includes a PingPong report indicating the ECGI of the radio base station apparatus 101A in the RRC connection reconfiguration completion notification and transmits it to the radio base station apparatus 101A (step S269).

  Next, the wireless base station device 101A receives the RRC connection reconfiguration completion notification from the wireless terminal device 202, compares the ECGI indicated by the PingPong report included in the RRC connection reconfiguration completion notification with its own ECGI, Since both match, “Ping Pong HO” between the cell CA and the cell CB is detected. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Ping Pong HO” (step S270).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so as to suppress the occurrence of “Ping Pong HO” between the cell CA and the cell CB (step S271).

  Further, when the radio terminal apparatus 202 notifies the radio base station apparatus of ECGI, or when the elapsed time becomes equal to or greater than the predetermined value, the radio terminal apparatus 202 deletes the held ECGI (step S272).

  As described above, in the example illustrated in FIG. 29, the wireless terminal device 202 performs, for example, a handover operation from the wireless base station device 101A to the wireless base station device 101B among a plurality of wireless base station devices in the wireless communication system. The base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, the radio terminal apparatus 202 retains the elapsed time when the elapsed time is less than a predetermined value when starting a handover operation to the radio base station apparatus. The received base station identification information is notified to the handover destination radio base station apparatus.

  The wireless base station device 101A receives the above notification from the wireless terminal device 202, and when the base station identification information notified from the wireless terminal device 202 matches its own identification information, the wireless base station device 101A It is determined that the handover operation from the station apparatus 101A to the radio base station apparatus 101B is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  FIG. 30 is a sequence diagram defining an example of an operation procedure when the radio base station apparatus according to the first embodiment of the present invention performs a “Ping Pong HO” detection process.

  Referring to FIG. 30, first, similarly to the handover operation shown in FIG. 2, after radio base station apparatus 101A determines radio base station apparatus 101B as a handover destination, radio base station apparatus 101A An RRC connection reconfiguration instruction including a handover instruction to is transmitted to the wireless terminal device 202 (step S321).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101B, the wireless terminal device 202 transmits an RRC connection reconfiguration completion notification including a handover completion notification to the wireless base station device 101B ( Step S322).

  Next, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, and transmits a terminal information release instruction to the radio base station apparatus 101A via the higher-level apparatus (steps S323 and S324).

  Next, the wireless base station device 101A receives the terminal information release instruction from the wireless base station device 101B. For example, when starting communication with the wireless terminal device 202, the wireless base station device 101A acquires the wireless terminal device 202 obtained from the wireless terminal device 202. The unique ID is retained. Alternatively, the wireless base station device 101A acquires the unique ID of the wireless terminal device 202 from the host device and holds it (step S325). The wireless base station device 101A can uniquely identify the wireless terminal device 202 by this unique ID.

  Next, the radio base station apparatus 101A starts a timer for measuring the elapsed time from the handover operation of the radio terminal apparatus 202 to the radio base station apparatus 101B (step S326). The wireless base station device 101A can measure the elapsed time for each wireless terminal device 202.

  Next, the radio base station apparatus 101B determines the radio base station apparatus 101A as a handover destination, and transmits an RRC connection reconfiguration instruction including a handover instruction to the radio base station apparatus 101A to the radio terminal apparatus 202 (step S328). .

  Next, the radio terminal apparatus 202 receives the RRC connection reconfiguration instruction from the radio base station apparatus 101B, and transmits its own unique ID to the handover destination radio base station apparatus (step S329). The PingPong report shown is included in the RRC connection reconfiguration completion notification and transmitted to the radio base station apparatus 101A (step S330).

  Next, the radio base station apparatus 101A receives the RRC connection reconfiguration completion notification from the radio terminal apparatus 202, confirms the timer that has been started, and the uniqueness indicated by the PingPong report included in the RRC connection re-establishment request. The ID is compared with the held unique ID. The radio base station apparatus 101A detects “Ping Pong HO” between the cell CA and the cell CB when the value of the timer is less than the predetermined threshold value and the two unique IDs match. For example, the radio base station apparatus 101A determines that the handover from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 was “Ping Pong HO” (step S331).

  Next, the radio base station apparatus 101A executes a handover operation optimizing process so as to suppress the occurrence of “Ping Pong HO” between the cell CA and the cell CB (step S332).

  In addition, when the value of the timer exceeds a predetermined threshold, the radio base station apparatus 101A releases the held unique ID (step S327).

  In this way, in the example shown in FIG. 30, the radio base station apparatus 101A receives the terminal identification information, that is, the unique ID of the radio terminal apparatus 202 that selects itself as a communication destination from an apparatus other than itself, such as the radio terminal apparatus 202 or the host apparatus. get. Also, the radio base station apparatus 101A measures the elapsed time from the timing of the handover operation to the radio base station apparatus 101B of the radio terminal apparatus 202 that has selected itself as the communication destination.

  When completing a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B, when the radio terminal apparatus 202 performs a new handover operation to the radio base station apparatus, the radio terminal apparatus 202 transmits its own terminal identification information to the handover destination. The radio base station apparatus, in the above example, is notified to the radio base station apparatus 101A.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the acquired terminal identification information, and the elapsed time is less than a predetermined value. In some cases, it is determined that the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate. Then, the radio base station apparatus 101A adjusts the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202. Specifically, for example, hysteresis HS, TTT, offset OST, etc. Adjust the parameters.

  Also, the wireless base station device 101A retains the terminal identification information of the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101B is completed, When the time exceeds the predetermined value, the terminal identification information is deleted.

  Note that, in the radio communication system according to the first embodiment of the present invention, the radio base station apparatus determines “Too Early HO” and “Ping Pong HO” when a predetermined condition is satisfied, and determines that these are inappropriate. The handover operation is optimized so that the occurrence of the handover operation is suppressed, that is, the timing control of the handover operation is executed. However, the present invention is not limited to this. The radio base station apparatus does not execute the timing control of the handover operation, for example, stores the detection results of “Too Early HO” and “Ping Pong HO” or notifies the management apparatus of the detection results. Also good. Further, the radio base station apparatus may perform a timing control of the handover operation when the predetermined condition is satisfied without executing the step of determining “Too Early HO” and “Ping Pong HO”. Good.

  FIG. 31 is a diagram illustrating an example of a PingPong report transmitted by the wireless terminal device in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 31, this PingPong report includes the result of the power measurement process performed last by the wireless terminal apparatus 202 on the serving cell formed by the serving base station and each neighboring cell. The result of this power measurement process is, for example, the received power of a radio signal from the serving base station or SINR (Signal to Interference-plus-Noise Ratio).

  In addition, the PingPong report includes the EGCI of the radio base station apparatus that is the last handover source of the radio terminal apparatus 202, the C-RNTI assigned from the radio base station apparatus, and the radio in the cell formed by the radio base station apparatus. The stay time of the terminal device 202 is included.

  Also, the PingPong report is formed by the EGCI of the radio base station apparatus that is the second handover source from the end of the radio terminal apparatus 202, the C-RNTI assigned by the radio base station apparatus, and the radio base station apparatus The stay time of the wireless terminal device 202 in the cell is included. This staying time is a timer value in the wireless terminal device 202 described above.

  Further, the PingPong report includes the unique ID of the wireless terminal device 202. In each sequence shown in FIGS. 26 to 30, the PingPong report may not include unused information.

  With the configuration in which the C-RNTI or the unique ID is notified to the radio base station apparatus, the radio base station apparatus can identify the radio terminal apparatus that is the notification source of the C-RNTI or the unique ID. Therefore, for example, CQI (Channel Quality Indication) ) And the like, it is possible to perform more accurate handover control and further optimize the handover operation.

  By the way, when an inappropriate handover operation as described in Non-Patent Document 1 is performed, various problems such as communication interruption and increase in communication traffic occur in the communication system.

  On the other hand, in the wireless communication system according to the first embodiment of the present invention, the wireless terminal device 202 includes, for example, the wireless base station device 101A to the wireless base station among a plurality of wireless base station devices in the wireless communication system. When performing a handover operation to the apparatus 101B, the base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  The wireless terminal device 202 holds when the communication with the wireless base station device is newly resumed or the handover operation to the wireless base station device is newly performed after the handover operation to the wireless base station device 101B is completed. The received base station identification information and terminal identification information are notified to the radio base station apparatus.

  Upon receiving the above notification from the wireless terminal device 202, the wireless base station device 101A matches the base station identification information notified from the wireless terminal device 202 with its own identification information, and the terminal identification notified from the wireless terminal device 202 When the information matches the terminal identification information given by itself and the elapsed time is less than the predetermined value, the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is not possible. The wireless terminal device 202 determines that it is appropriate, or adjusts the timing of the handover operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to.

  Therefore, in the wireless communication system according to the first embodiment of the present invention, communication can be stabilized by detecting an inappropriate handover operation.

  Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved.

  Also, in the radio communication system according to the first embodiment of the present invention, the radio base station apparatus 101A has completed the handover operation of the radio terminal apparatus 202 that selects itself as the communication destination to the radio base station apparatus 101B. Also, the terminal identification information given to the wireless terminal device 202 is held, and the terminal identification information is erased when the elapsed time is equal to or greater than the predetermined value.

  With such a configuration, the radio base station apparatus can appropriately hold and release identification information such as C-RNTI assigned to the radio terminal apparatus. Particularly, in the femto base station, since the number of wireless terminal devices connected simultaneously is smaller than that of the macro base station and the pico base station, the configuration in which the wireless base station device retains information on the wireless terminal device even after handover Is advantageous and more effective in femto base stations.

  Also, in the radio communication system according to the first embodiment of the present invention, radio terminal apparatus 202 notifies base station identification information and terminal identification information to the radio base station apparatus, or own radio base station apparatus 101B. After a predetermined time has elapsed from the timing of the handover operation to, the held base station identification information and terminal identification information are deleted.

  With such a configuration, the radio terminal apparatus can release the identification information such as ECGI of the radio base station apparatus and the identification information such as C-RNTI given from the radio base station apparatus at an appropriate timing.

  Further, in the radio communication system according to the first embodiment of the present invention, radio terminal apparatus 202, for example, from radio base station apparatus 101A to radio base station apparatus 101B among a plurality of radio base station apparatuses in the radio communication system. When performing the handover operation, the base station identification information such as ECGI of the radio base station apparatus 101A and the terminal identification information such as C-RNTI assigned from the radio base station apparatus 101A are held.

  The wireless base station device 101A measures the elapsed time from the timing of the handover operation to the wireless base station device 101B of the wireless terminal device 202 that has selected itself as the communication destination.

  Radio terminal apparatus 202 performs a new handover operation to radio base station apparatus after the completion of the handover operation to radio base station apparatus 101B. The radio terminal apparatus 202 newly performs the handover operation to radio base station apparatus 101A. When the base station identification information of the radio base station apparatus selected as the communication destination matches, the held terminal identification information is notified to the handover destination radio base station apparatus.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the terminal identification information provided by itself, and the elapsed time is a predetermined value. If it is less than that, it is determined that the handover operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is inappropriate, or the wireless terminal device 202 wirelessly transmits from the wireless base station device 101A to the wireless base station device 101B. The timing of the handover operation to the base station apparatus 101B is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to.

  Therefore, in the wireless communication system according to the first embodiment of the present invention, communication can be stabilized by detecting an inappropriate handover operation.

  Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved.

  In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted.

  Also, in the radio communication system according to the first embodiment of the present invention, the radio base station apparatus 101A has completed the handover operation of the radio terminal apparatus 202 that selects itself as the communication destination to the radio base station apparatus 101B. Also, the terminal identification information given to the wireless terminal device 202 is held, and the terminal identification information is erased when the elapsed time is equal to or greater than the predetermined value.

  With such a configuration, the radio base station apparatus can appropriately hold and release identification information such as C-RNTI assigned to the radio terminal apparatus. Particularly, in the femto base station, since the number of wireless terminal devices connected simultaneously is smaller than that of the macro base station and the pico base station, the configuration in which the wireless base station device retains information on the wireless terminal device even after handover Is advantageous and more effective in femto base stations.

  In the radio communication system according to the first embodiment of the present invention, the radio terminal apparatus 202 notifies the radio base station apparatus of the terminal identification information, or performs a handover operation to its own radio base station apparatus 101B. After a predetermined time has elapsed from the timing, the stored base station identification information and terminal identification information are deleted.

  With such a configuration, the radio terminal apparatus can release the identification information such as ECGI of the radio base station apparatus and the identification information such as C-RNTI given from the radio base station apparatus at an appropriate timing.

  Further, in the radio communication system according to the first embodiment of the present invention, radio terminal apparatus 202, for example, from radio base station apparatus 101A to radio base station apparatus 101B among a plurality of radio base station apparatuses in the radio communication system. When performing the handover operation, the base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, the radio terminal apparatus 202 newly restarts communication with the radio base station apparatus or starts a new handover operation to the radio base station apparatus. If the stored base station identification information of the radio base station apparatus 101A matches the base station identification information of the radio base station apparatus that is newly selected as the communication destination, and the elapsed time is less than the predetermined value, the predetermined information To the radio base station apparatus.

  Upon receiving the notification including the predetermined information from the wireless terminal device 202, the wireless base station device 101A determines that the handover operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is inappropriate. Or the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to.

  Therefore, in the wireless communication system according to the first embodiment of the present invention, communication can be stabilized by detecting an inappropriate handover operation.

  Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an inappropriate handover operation. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  Further, in the wireless communication system according to the first embodiment of the present invention, the wireless terminal device 202 retains when the predetermined information is notified to the wireless base station device or when the elapsed time is equal to or greater than the predetermined value. Delete base station identification information.

  With such a configuration, the radio terminal apparatus can release identification information such as ECGI of the radio base station apparatus at an appropriate timing.

  Further, in the radio communication system according to the first embodiment of the present invention, radio terminal apparatus 202, for example, from radio base station apparatus 101A to radio base station apparatus 101B among a plurality of radio base station apparatuses in the radio communication system. When performing the handover operation, the base station identification information such as ECGI of the radio base station apparatus 101A is held. Also, the wireless terminal device 202 measures the elapsed time from the timing of the handover operation to its own wireless base station device 101B.

  Then, after completing the handover operation to the radio base station apparatus 101B, the radio terminal apparatus 202 newly restarts communication with the radio base station apparatus or starts a new handover operation to the radio base station apparatus. When the elapsed time is less than the predetermined value, the stored base station identification information is notified to the radio base station apparatus.

  The wireless base station device 101A receives the above notification from the wireless terminal device 202, and when the base station identification information notified from the wireless terminal device 202 matches its own identification information, the wireless base station device 101A It is determined that the handover operation from the station apparatus 101A to the radio base station apparatus 101B is inappropriate, or the timing of the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to.

  Therefore, in the wireless communication system according to the first embodiment of the present invention, communication can be stabilized by detecting an inappropriate handover operation.

  Further, the configuration in which the elapsed time is measured in the wireless terminal device enables more accurate detection of an inappropriate handover operation. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  Further, in the wireless communication system according to the first embodiment of the present invention, when the wireless terminal device 202 notifies the wireless base station device of the base station identification information, or when the elapsed time is equal to or greater than the predetermined value, Delete the stored base station identification information.

  With such a configuration, the radio terminal apparatus can release identification information such as ECGI of the radio base station apparatus at an appropriate timing.

  In the wireless communication system according to the first embodiment of the present invention, the wireless base station device 101A obtains terminal identification information, that is, a unique ID of the wireless terminal device 202 that selects itself as a communication destination from devices other than itself. To do. Also, the radio base station apparatus 101A measures the elapsed time from the timing of the handover operation to the radio base station apparatus 101B of the radio terminal apparatus 202 that has selected itself as the communication destination.

  The wireless terminal device 202, when the handover operation from the wireless base station device 101A to the wireless base station device 101B is completed, resumes communication with the wireless base station device or newly performs a handover operation to the wireless base station device. When performing, it notifies the radio base station apparatus of its own terminal identification information.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the acquired terminal identification information, and the elapsed time is less than a predetermined value. In some cases, it is determined that the handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate, or the radio terminal apparatus 202 performs a radio base station operation from the radio base station apparatus 101A to the radio base station. The timing of the handover operation to the apparatus 101B is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to.

  Therefore, in the wireless communication system according to the first embodiment of the present invention, communication can be stabilized by detecting an inappropriate handover operation.

  Furthermore, with the configuration in which the identification information unique to the wireless terminal device is a detection condition, the wireless base station device can acquire the elapsed time for each wireless terminal device and more accurately detect an inappropriate handover operation. Become. Further, since the radio terminal apparatus can be specified in the radio base station apparatus, more accurate handover control can be performed, and further optimization of the handover operation can be achieved.

  Also, in the radio communication system according to the first embodiment of the present invention, the radio base station apparatus 101A has completed the handover operation of the radio terminal apparatus 202 that selects itself as the communication destination to the radio base station apparatus 101B. Also, the terminal identification information of the wireless terminal device 202 is held, and the terminal identification information is erased when the elapsed time exceeds the predetermined value.

  With such a configuration, the radio base station apparatus can appropriately hold and release identification information unique to the radio terminal apparatus. Particularly, in the femto base station, since the number of wireless terminal devices connected simultaneously is smaller than that of the macro base station and the pico base station, the configuration in which the wireless base station device retains information on the wireless terminal device even after handover Is advantageous and more effective in femto base stations.

  In the sequences shown in FIGS. 20, 21, 26, and 27, the radio base station device and the radio terminal device may perform the following operations.

  That is, the radio terminal apparatus 202 transmits terminal identification information to the radio base station apparatus during the connection operation to the radio base station apparatus or immediately after completion of the connection operation. Specifically, for example, the terminal identification information is transmitted to the RRC. It is included in connection information (RRC Connection Setup) and transmitted to the radio base station apparatus.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device, specifically, Performed during connection operation or immediately after completion of connection operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  Alternatively, the radio terminal apparatus 202 transmits the terminal identification information to the radio base station apparatus during the reconnection operation to the radio base station apparatus or immediately after the completion of the reconnection operation. Specifically, for example, the terminal identification information Is included in the RRC connection reestablishment request and transmitted to the radio base station apparatus.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device. Performed during reconnection operation or immediately after completion of reconnection operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  Alternatively, the radio terminal device 202 transmits the terminal identification information to the radio base station device during the handover operation to the radio base station device or immediately after the completion of the handover operation.

  In this way, notification of terminal identification information from the wireless terminal device to the wireless base station device is as early as possible after information can be transmitted and received between the wireless terminal device and the wireless base station device, specifically, This is performed during the handover operation or immediately after the completion of the handover operation. With such a configuration, since the occurrence of an inappropriate handover operation can be grasped at an early stage and the parameters of the handover operation can be adjusted, the recurrence of the inappropriate handover operation can be prevented more effectively.

  Alternatively, the wireless terminal device 202 transmits terminal identification information to the wireless base station device in response to a request from the wireless base station device.

  Depending on the installation location of the radio base station apparatus, the handover operation parameters may be fixedly set according to the surrounding geographical information and the like. As described above, the wireless terminal device 202 transmits the terminal identification information only when requested from the wireless base station device. Information that prompts parameter adjustment can be prevented from being wasted from the wireless terminal device.

  In addition, when the elapsed time from the handover operation from itself to another radio base station apparatus by the radio terminal apparatus 202 is less than a predetermined value, the radio base station apparatus transmits the terminal identification information given to the radio terminal apparatus 202 and The same terminal identification information is not given to the wireless terminal device 202 that newly selects itself as a communication destination.

  If the same identification information is given to a plurality of wireless terminal devices 202 in the wireless base station device, which handover operation should be referred to even if the wireless terminal device 202 transmits the terminal identification information? I don't know. As described above, with the configuration in which terminal identification information assigned in the past is not assigned to the new wireless terminal device 202 within a predetermined time, the elapsed time to be used is correctly acquired, and inappropriate handover operation is more accurately performed. Can be detected.

  The radio terminal device 202 is one of the number of executions of the handover operation, the number of executions of the connection operation for the radio base station device, and the number of times of the reconnection operation for the radio base station device, or a combination of at least any two When the total exceeds a predetermined number of times, the held terminal identification information is deleted.

  If the terminal identification number given from the radio base station apparatus is stored for each of the connection operation, the reconnection operation, and the handover operation, the usable memory area of the radio terminal apparatus 202 is greatly reduced. As described above, the configuration in which the terminal identification information is erased when the specified number of times has been exceeded makes it possible to prevent a significant decrease in the usable memory area of the wireless terminal device 202.

  In the first embodiment of the present invention, the handover operation of the radio terminal apparatus has been specifically described. However, inter-base station movement (inter-cell movement) performed by the radio terminal apparatus communicating with the radio base station apparatus. The present invention is applied not only to handover as an operation but also to movement between base stations (movement between cells) performed by an idle wireless terminal device. That is, in the first embodiment of the present invention, the present invention is also applied to a configuration and operation in which “handover” is replaced with “movement”.

  Further, the radio communication system according to the first embodiment of the present invention has a configuration in which an elapsed time from the timing of the handover operation of the radio terminal apparatus is obtained by a timer. This “handover operation timing” is not limited to the timing exemplified in each of the above sequences, and may be any timing in the handover operation. That is, any timing immediately before, during, and immediately after the handover operation, such as a timing for deciding to perform handover, may be used.

  Further, although the radio communication system according to the first embodiment of the present invention is configured to use ECGI in order to confirm matching of radio base station apparatuses, the present invention is not limited to this. A configuration using PCI instead of ECGI may also be used.

  Further, in the wireless communication system according to the first embodiment of the present invention, the wireless terminal device predetermines the base station identification information of the handover source wireless base station device and the terminal identification information given from the wireless base station device. The base station identification information and the list of terminal identification information in the predetermined period may be used for matching determination in the wireless terminal device or the wireless base station device.

  That is, similar to the sequences shown in FIG. 20 and FIG. 26, the radio base station apparatus gives terminal identification information to the radio terminal apparatus 202 that selects itself as the communication destination, and the radio that has selected itself as the communication destination. The elapsed time from the timing of the moving operation from the terminal device 202 to itself to another radio base station device is measured.

  The wireless terminal device 202 holds the base station identification information of the wireless base station device selected by itself as the communication destination and the terminal identification information given from the wireless base station device for a predetermined period.

  In addition, the wireless terminal device 202 restarts communication with the wireless base station device after completion of the moving operation from the wireless base station device 101A to the wireless base station device 101B among the plurality of wireless base station devices or When newly moving to the radio base station apparatus, the held base station identification information and terminal identification information are notified to the radio base station apparatus.

  Then, upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the base station identification information notified from the wireless terminal device 202 with its own identification information, and is notified from the wireless terminal device 202. When the terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the wireless terminal device 202 moves from the wireless base station device 101A to the wireless base station device 101B. Or the timing of the moving operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation.

  Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  That is, similar to the sequences shown in FIG. 21 and FIG. 27, the radio base station apparatus gives terminal identification information to the radio terminal apparatus 202 that selects itself as the communication destination and the radio that has selected itself as the communication destination. The elapsed time from the timing of the moving operation from the terminal device 202 to itself to another radio base station device is measured.

  The wireless terminal device 202 holds the base station identification information of the wireless base station device selected by itself as the communication destination and the terminal identification information given from the wireless base station device for a predetermined period.

  In addition, the wireless terminal device 202 restarts communication with the wireless base station device after completion of the moving operation from the wireless base station device 101A to the wireless base station device 101B among the plurality of wireless base station devices or When newly starting the moving operation to the radio base station apparatus, if the held base station identification information matches the base station identification information of the radio base station apparatus newly selected as the communication destination, the held terminal identification Information is notified to the radio base station apparatus.

  Upon receiving the notification from the wireless terminal device 202, the wireless base station device 101A matches the terminal identification information notified from the wireless terminal device 202 with the terminal identification information given by itself, and the elapsed time. If it is less than the predetermined value, it is determined that the movement operation from the radio base station apparatus 101A to the radio base station apparatus 101B by the radio terminal apparatus 202 is inappropriate, or the radio base station apparatus 101A by the radio terminal apparatus 202 The timing of the moving operation from the mobile station to the radio base station apparatus 101B is adjusted.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation.

  Furthermore, in addition to the match of the base station identification information, the configuration in which the match of the terminal identification information given by the radio base station device to the radio terminal device is used as a detection condition. Obtaining and enabling more accurate detection of inappropriate handover operations. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  In addition, the wireless terminal device transmits the base station identification information to the wireless base station device in vain due to the configuration in which the wireless terminal device notifies the terminal identification information only to the wireless base station device that has been selected as a communication partner in the past. In addition, the operation of the radio base station apparatus determining whether the base station identification information notified from the radio terminal apparatus matches the base station identification information of itself can be omitted.

  Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  Alternatively, similarly to the sequences shown in FIGS. 22 and 28, the wireless terminal device 202 holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and the other wireless base device itself. The elapsed time from the timing of the moving operation to the station device is measured.

  In addition, the wireless terminal device 202 restarts communication with the wireless base station device after completion of the moving operation from the wireless base station device 101A to the wireless base station device 101B among the plurality of wireless base station devices or When newly starting the moving operation to the radio base station apparatus, the stored base station identification information matches the base station identification information of the radio base station apparatus to be newly selected as the communication destination, and the own radio base station apparatus When the elapsed time from the timing of the moving operation to 101B is less than a predetermined value, the wireless base station apparatus is notified of the predetermined information.

  Then, the wireless base station device 101A receives the notification including the predetermined information from the wireless terminal device 202, and the moving operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is inappropriate. The wireless terminal device 202 adjusts the timing of the moving operation from the wireless base station device 101A to the wireless base station device 101B.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation.

  Furthermore, the configuration of measuring the elapsed time and confirming the coincidence of the base station identification information in the wireless terminal device enables more accurate detection of an inappropriate handover operation. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  Alternatively, similarly to the sequences shown in FIG. 23 and FIG. 29, the wireless terminal device 202 holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period of time and The elapsed time from the timing of the moving operation to the station device is measured.

  In addition, the wireless terminal device 202 restarts communication with the wireless base station device after completion of the moving operation from the wireless base station device 101A to the wireless base station device 101B among the plurality of wireless base station devices or When a new movement operation to the radio base station apparatus is started, if the elapsed time from the timing of the movement operation to its own radio base station apparatus 101B is less than a predetermined value, the stored base station identification information is Notify the base station device.

  Then, the wireless base station device 101A receives the above notification from the wireless terminal device 202, and when the base station identification information notified from the wireless terminal device 202 matches its own identification information, the wireless base station device 202A It is determined that the moving operation from the wireless base station device 101A to the wireless base station device 101B is inappropriate, or the timing of the moving operation from the wireless base station device 101A to the wireless base station device 101B by the wireless terminal device 202 is adjusted. To do.

  With such a configuration, “Too Early HO” in which the timing of handover by the radio terminal apparatus is too early and “Ping Pong HO” in which handover by the radio terminal apparatus is repeated between radio base station apparatuses are detected by the radio base station apparatus alone. It becomes possible to do. That is, even when information cannot be exchanged between radio base station apparatuses, an inappropriate handover operation can be detected. In addition, since there is no need to exchange information between radio base station apparatuses, it is possible to simplify the processing in the core network and reduce communication traffic.

  Then, the radio base station apparatus detects an inappropriate handover operation, for example, can adjust a parameter for controlling the handover operation to suppress the inappropriate handover operation, and thus constructs a good communication system. be able to. Therefore, it is possible to stabilize communication by detecting an inappropriate handover operation.

  Further, the configuration in which the elapsed time is measured in the wireless terminal device enables more accurate detection of an inappropriate handover operation. Then, more accurate handover control can be performed in the radio base station apparatus to further optimize the handover operation.

  Also, when handing over to a new radio base station apparatus, the identification information of the past handover source radio base station apparatus and the identification information given from the radio base station apparatus are retained for one radio base station apparatus. Compared to the configuration, the inappropriate handover operation can be detected in a wider range.

  The “predetermined period” in which the wireless terminal device holds the base station identification information or the terminal identification information can be variously considered. For example, the wireless terminal device may hold the base station identification information or the terminal identification information until a predetermined time has elapsed after acquiring the base station identification information or the terminal identification information. The base station identification information or the terminal identification information acquired a predetermined time before the timing of the new handover operation may be held.

  Next, another embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Second Embodiment>
The present embodiment relates to a radio communication system that assumes a case different from the radio communication system according to the first embodiment. The contents other than those described below are the same as those of the wireless communication system according to the first embodiment.

  FIG. 32 is a diagram illustrating an example of a scenario assumed in the wireless communication system according to the first embodiment of the present invention.

  Referring to FIG. 32, a cell CB formed by radio base station apparatus 101B includes a cell CB1 including an installation area of radio base station apparatus 101B and a radio cell formed in cell CA formed by radio base station apparatus 101A. The cell CB2 does not include an installation area of the base station device 101B. Cell CA and cell CB partially overlap.

  In the radio communication system according to the first embodiment of the present invention, in a situation where there is no X2 interface between radio base station apparatus 101A and radio base station apparatus 101B, radio base station apparatus 101A to radio base station apparatus 101B It detects that the handover of the wireless terminal device 202 is “Too Early HO”, for example.

  Specifically, the wireless terminal device 202 moves to the cell CB2 from a state where the wireless terminal device 202 is located in the cell CA and is communicating with the wireless base station device 101A, and further moves out of the cell CB2 to the cell CA. In this case, a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101B is performed as the cell CA moves to the cell CB2. The wireless terminal device 202 holds the C-RNTI and the like given from the handover destination wireless base station device 101B. Then, after the RLF due to the movement from the cell CB2 to the cell CA, an RLF report indicating the C-RNTI or the like is transmitted to the radio base station apparatus 101A to the radio base station apparatus 101A to be the communication destination. With this RLF report, “Too Early HO” can be detected.

  In this operation, the wireless terminal device 202 only holds the C-RNTI assigned from the wireless base station device 101B that has established the RRC connection immediately before.

  Therefore, the radio base station apparatus 101 that has caused the occurrence of “Too Early HO” or “HO to Wron Cell”, that is, the radio base station apparatus in which the radio terminal apparatus 202 has established a communication connection two times before 101A cannot identify which wireless terminal device 202 has a problem with the handover operation.

  The radio base station apparatus 101 does not always perform a handover operation with the same execution criteria for all radio terminal apparatuses 202. For example, the handover operation execution reference may be changed according to the load adjustment between the radio base station apparatuses and the moving speed of the radio terminal apparatus 202.

  Therefore, in the radio communication system according to the second embodiment of the present invention, it is possible to perform a detailed analysis of an inappropriate handover operation and an appropriate timing control of the handover operation and the like by the following operations. To do.

  FIG. 33 is a diagram illustrating an example of a scenario assumed in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 33, for example, radio base station apparatus 101A and radio base station apparatus 101B are macro base stations, and radio base station apparatus 101C is a pico base station. The cell CA formed by the radio base station apparatus 101A and the cell CB formed by the radio base station apparatus 101B partially overlap, and most of the cells CC formed by the radio base station apparatus 101C are included in this overlapping area. It is.

  Here, it is assumed that the wireless terminal device 202 is located in the cell CA and is in communication with the wireless base station device 101A, moves to the cell CC, then leaves the cell CC and moves to the cell CB.

  FIG. 34 is a diagram illustrating an example of a sequence of an improper handover operation (HO to Wong Cell) detection process and a handover operation optimization process in the wireless communication system according to the second embodiment of the present invention. . In FIG. 34, for the sake of simplicity, detailed information transmission / reception is not shown, but for example, various types of information shown in FIG. 9 are transmitted / received.

  Referring to FIG. 34, in the handover operation from radio base station apparatus 101A to radio base station apparatus 101C performed as radio terminal apparatus 202 moves from cell CA to cell CC, radio base station apparatus 101A An RRC connection reconfiguration instruction (RRC Connection Reconfiguration) is transmitted to the terminal device 202 (step S401).

  Next, radio base station apparatus 101A retains, for example, No. 1 C-RNTI (hereinafter referred to as C-RNTI (1)) assigned to radio terminal apparatus 202 and handover type information indicating the type of the handover operation. (Step S402).

  Here, the handover type information is, for example, a number from 0 to 7, and the contents of the handover operation can be determined by this number. Specifically, for example, a handover operation for the wireless terminal device 202 with a low moving speed, a handover operation for the wireless terminal device 202 with a medium moving speed, a handover operation for the wireless terminal device 202 with a high moving speed, A handover operation for load adjustment between station apparatuses and a handover operation for cell radius expansion are associated with different numbers. Here, “handover operation for expanding cell radius” means a handover operation in which an offset OST or the like is adjusted in order to promote a handover operation to a small base station.

  Further, even when the radio terminal apparatus 202 receives the RRC connection reconfiguration instruction, the radio terminal apparatus 202 holds the ECGI of the radio base station apparatus 101A that is the handover source and the C-RNTI (1) given by the radio base station apparatus 101A. (Step S403).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101C. (Step S404).

  Next, the radio base station apparatus 101C starts a timer in order to measure the stay time in the cell CC of the radio terminal apparatus 202 (step S405).

  Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101C, the radio terminal apparatus 202 moves out of the cell CC and into the cell CB. Then, the radio terminal apparatus 202 has a large interference of radio signals transmitted from the radio base station apparatus 101B and cannot communicate with the radio base station apparatus 101C, so that RLF occurs (step S406).

  Next, when detecting the occurrence of RLF, the wireless terminal device 202 searches for nearby wireless base station devices by measuring the reception power of the wireless signal or the like. In this case, since the reception power of the radio signal from the radio base station apparatus 101B is maximized, the radio terminal apparatus 202 receives an RRC connection reestablishment request (RRC Connection) in order to reconnect to the searched radio base station apparatus 101B. Reestablishment Request) is transmitted to the radio base station apparatus 101B (step S407).

  Next, as in the sequence shown in FIG. 9 for example, RRC connection re-establishment rejection is transmitted from the radio base station apparatus 101C to the radio terminal apparatus 202, and the normal connection procedure with the radio base station apparatus 101C by the radio terminal apparatus 202 is performed. After that, an RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C.

  Then, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification including “rlf-InfoAvailable” from the radio terminal apparatus 202, recognizes that an RLF has occurred in the radio terminal apparatus 202, and performs RLF In order to acquire the detailed information, a terminal information request (UE Information Request) is transmitted to the wireless terminal device 202.

  Next, the wireless terminal device 202 receives the terminal information request from the wireless base station device 101B, and transmits a terminal information response (UE Information Response) including the RLF report to the wireless base station device 101B (step S408).

  Here, the RLF report includes, for example, the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF generation is the ID of the radio base station apparatus 101C, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101B, and the C-RNTI is assigned by the radio base station apparatus 101B ID. Further, the RLF report is transmitted from the wireless base station apparatus 101A, which is the connection destination two previous to the wireless terminal apparatus 202, that is, the wireless base station apparatus 101A in which the wireless terminal apparatus 202 established the RRC connection before the wireless base station apparatus 101C. The C-RNTI assigned to the wireless base station apparatus 101A and the PCI and ECGI of the wireless base station apparatus 101A.

  Next, the radio base station apparatus 101B recognizes that RLF has occurred in the radio base station apparatus 101C by referring to the PCI of the radio base station apparatus 101C indicated by the RLF report received from the radio terminal apparatus 202, and the cell It is determined that “Too Late HO” has occurred to the CB. Then, the radio base station apparatus 101B transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101C via the X2 interface in order to notify that it is “Too Late HO” ( Step S409).

  Next, upon receiving the RLF notification from the radio base station apparatus 101B, the radio base station apparatus 101C checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” to the cell CB, and since the RLF notification is received from the radio base station apparatus 101B other than the radio base station apparatus 101A, It is determined that it is not “Too Early HO” but “HO to Wron Cell” to the cell CC. When the radio base station apparatus 101C receives the RLF notification from the radio base station apparatus 101B, if the timer is not operating, that is, if the predetermined time has elapsed since the timer was started, the cell CB And “Too Late HO”.

  If the radio base station apparatus 101C determines that it is “HO to Wong Cell” for the cell CC, the radio base station apparatus 101C transmits a handover report including the contents of the RLF notification to the radio base station apparatus 101A. The handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101C notifies the radio base station apparatus 101A of “HO to Wron Cell” by setting this parameter to a predetermined value (step S410).

  Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101C, recognizes that “HO to Wong Cell” has occurred in the cell CC, and generates “HO to Wong Cell”. In order to be suppressed, the optimization process of the handover operation is executed.

  More specifically, the radio base station apparatus 101A is assigned to the PCI and ECGI of the radio base station apparatus 101 to which the radio terminal apparatus 202 is connected immediately before the radio terminal apparatus 202 and the radio terminal apparatus 202 included in the handover report. The C-RNTI is collated with its own PCI and ECGI, and the information held therein, that is, the C-RNTI (1) that the self gives to the wireless terminal device 202 in the past.

  Then, since the content of the handover report matches the held content, the radio base station apparatus 101A determines that the C-RNTI is based on the handover type information corresponding to the held C-RNTI (1). An optimization process for the type of handover operation corresponding to (1), for example, a handover operation execution standard is corrected. That is, the radio base station apparatus 101A sets parameters so that the timing of the handover operation is delayed. Specifically, for example, the hysteresis HS is increased, the TTT is increased, or the offset OST is decreased (step S411).

  In the operation illustrated in FIG. 9, the radio base station apparatus 101 can detect “HO to Wong Cell”, and which radio terminal among the radio terminal apparatuses 202 that have established an RRC connection with itself. It cannot be recognized whether the handover operation of the device 202 is “HO to Wong Cell”.

  On the other hand, in the wireless communication system according to the second embodiment of the present invention, the wireless terminal device 202 holds information such as C-RNTI included in the last received RRC connection reconfiguration instruction, and RLF Is reported to the radio base station apparatus 101 by an RLF report. That is, with the configuration in which the RLF report includes information related to the radio base station apparatus 101 to which the radio terminal apparatus 202 is connected immediately before the radio terminal apparatus 202, the radio base station apparatus 101 performs a handover operation of “HO to Wong Cell”. It becomes possible to recognize whether it was "."

  FIG. 35 is a diagram illustrating a configuration of a wireless terminal apparatus according to the second embodiment of the present invention.

  Referring to FIG. 35, radio terminal apparatus 202 includes antenna 81, circulator 82, radio receiver 83, radio transmitter 84, signal processor 85, controller 88, and input / output unit 89. Prepare. The signal processing unit 85 includes a reception signal processing unit 86 and a transmission signal processing unit 87. The signal processing unit 85 and the control unit 88 are realized by a CPU (Central Processing Unit), a DSP (Digital Signal Processor), or the like.

  Circulator 82 outputs the radio signal received from antenna 81 from radio base station apparatus 101 to radio reception unit 83, and outputs the radio signal received from radio transmission unit 84 to antenna 81.

  Radio receiving section 83 converts the radio signal received from circulator 82 into a baseband signal or IF (Intermediate Frequency) signal, converts the frequency-converted signal into a digital signal, and outputs the digital signal to received signal processing section 86.

  The received signal processing unit 86 performs signal processing such as FFT (Fast Fourier Transform) in the OFDM (Orthogonal Frequency Division Multiplex) method on the digital signal received from the wireless receiving unit 83, and outputs one of the digital signals after the signal processing. Part or all of the data is output to the control unit 88.

  The control unit 88 converts the digital signal received from the reception signal processing unit 86 into, for example, audio data and video data, and converts it into an analog signal as necessary. And the control part 88 outputs to the input-output part 89 containing a speaker, a microphone, a display, a key input device, etc.

  Further, the control unit 88 receives, for example, voice data and a control signal for controlling the wireless terminal device 202 received by the key input device from the input / output unit 89. Control unit 88 performs predetermined signal processing on the audio data and control signal received from input / output unit 89 to generate communication data, and outputs the communication data to transmission signal processing unit 87.

  The transmission signal processing unit 87 performs signal processing such as spreading processing in the CDMA (Code Division Multiple Access) system on the communication data received from the control unit 88 or communication data generated by itself, and the digital signal after this signal processing Is output to the wireless transmission unit 84.

  The wireless transmission unit 84 converts the digital signal received from the transmission signal processing unit 87 into an analog signal, converts the frequency of the converted analog signal into a wireless signal, and outputs the radio signal to the circulator 82.

  FIG. 36 is a diagram illustrating a configuration of a control unit in the wireless terminal device according to the second embodiment of the present invention.

  Referring to FIG. 36, control unit 88 includes a holding unit 11 and a notification unit 12.

  As described with reference to FIG. 34, the holding unit 11 performs the ECGI and the like of the radio base station apparatus 101A when the handover operation of the own radio terminal apparatus 202 from the radio base station apparatus 101A to the radio base station apparatus 101C is performed. The base station identification information and terminal identification information such as C-RNTI assigned to the wireless terminal apparatus 202 from the wireless base station apparatus 101A are held.

  Then, when the communication unit 12 restarts communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C, for example, When performing the reconnection operation, the base station identification information and the terminal identification information held by the holding unit 11 are notified to the radio base station apparatus 101.

  For example, the wireless base station device 101A retains the terminal identification information given to the wireless terminal device 202 even when the handover operation of the wireless terminal device 202 that selects itself as the communication destination to the wireless base station device 101C is completed. . Further, for example, the radio base station apparatus 101A holds the type of handover operation from the radio terminal apparatus 202 to the radio base station apparatus 101C.

  Then, the radio base station apparatus 101A acquires the base station identification information and the terminal identification information notified by the radio terminal apparatus 202, collates the held terminal identification information with the acquired terminal identification information, and its own base station identification information And the acquired base station identification information.

  Note that the notification unit 12 performs a new handover operation to the radio base station apparatus 101 after the handover operation to the radio base station apparatus 101C is completed in its own radio terminal apparatus 202, for example, as shown in FIG. When performing, the base station identification information and the terminal identification information held by the holding unit 11 may be notified to the radio base station apparatus 101.

  In the sequence shown in FIG. 34, the radio terminal apparatus 202 may hold handover type information and include it in the RLF report instead of the radio base station apparatus 101 or together with the radio base station apparatus 101.

  That is, the holding unit 11 holds the type of the handover operation when the handover operation of its own wireless terminal device 202 is performed from the wireless base station device 101A to the wireless base station device 101C.

  Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When performing the handover operation to, the radio base station apparatus 101 is notified of the type of the handover operation held by the holding unit 11.

  Also, in the sequence shown in FIG. 34, a configuration in which the radio terminal apparatus 202 maintains its own moving speed during the handover operation and is included in the RLF report instead of the radio base station apparatus 101 or together with the radio base station apparatus 101. It may be.

  That is, when the handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed, the holding unit 11 performs the wireless terminal device 202 of the wireless terminal device 202 when the handover operation is performed. Keep the moving speed of.

  Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When the handover operation to is performed, the radio base station apparatus 101 is notified of the moving speed held by the holding unit 11.

  Also, the radio base station apparatus 101A may be configured to hold the moving speed of the radio terminal apparatus 202 when the radio terminal apparatus 202 performs a handover operation from itself to the radio base station apparatus 101C.

  Also, in the sequence shown in FIG. 34, the radio base station apparatus 101A determines the degree of control of the timing of the handover operation using “timeConnFailure-r10” described later included in the handover report received from the radio base station apparatus 101C. May be.

  The radio base station apparatus 101 is not limited to the configuration that acquires the base station identification information and the terminal identification information notified from the radio terminal apparatus 202 to the other radio base station apparatus 101 from the other radio base station apparatus 101, Base station identification information and terminal identification information notified to itself by the wireless terminal device 202 that has returned to itself, that is, the wireless terminal device 202 that performs the reconnection operation or the handover operation to itself, and the base station that is held A case where the identification information and the terminal identification information are collated is also conceivable.

  FIG. 37 is a diagram illustrating an example of the contents of the RLF report in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 37, this RLF report is obtained by adding new information to the RLF report in LTE.

  Specifically, the parameter “previousPCellRnti” is added, and the C-RNTI included in the RRC connection reconfiguration instruction received last by the wireless terminal device 202 is set (PL2).

  Also, the parameter “timeConnFailure-r10” is set with a time until RLF is generated in the wireless terminal device 202 that has established the RRC connection with the wireless base station device 101 (PL1).

  FIG. 38 is a diagram illustrating an example of the content of the RLF notification in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 38, this RLF notification has the same contents as the RLF notification in LTE, for example.

  The content of the RLF report is stored in “UE RLF Report Container” in the RLF notification. That is, since “previousPCellRnti” is included in the existing RLF notification, the RLF notification in LTE can also be used in the radio communication system according to the second embodiment of the present invention.

  FIG. 39 is a diagram illustrating an example of the content of a handover report in the wireless communication system according to the second embodiment of the present invention.

  Referring to FIG. 39, this handover report is obtained by adding new information to the handover report in LTE.

  Specifically, the parameter “C-RNTI” is added, and the C-RNTI indicated by “previousPCellRnti” in the RLF report is set (PL11).

  In addition, a parameter “Time Of Stay” is added, and a time indicated by “timeConnFailure-r10” in the RLF report is set (PL12).

  In FIGS. 33 to 39, an example of performing a detailed analysis of an inappropriate handover operation using C-RNTI has been described, but not limited to C-RNTI, if the type of handover operation can be identified, Any information may be used. For example, handover identification information itself may be used instead of C-RNTI.

  FIG. 40 is a diagram illustrating an example of a sequence of an improper handover operation (HO to Wong Cell) detection process and a handover operation optimization process in the wireless communication system according to the second embodiment of the present invention. . FIG. 40 does not show transmission / reception of detailed information for the sake of simplicity, but various information shown in FIG. 9, for example, is transmitted / received. The scenario assumed here is the scenario shown in FIG. 33 as in FIG.

  Referring to FIG. 40, in the handover operation from radio base station apparatus 101A to radio base station apparatus 101C performed as radio terminal apparatus 202 moves from cell CA to cell CC, radio base station apparatus 101A An RRC connection reconfiguration instruction (RRC Connection Reconfiguration) is transmitted to the terminal device 202. This RRC connection reconfiguration instruction includes handover type information indicating the type of the handover operation (step S421).

  Next, the radio base station apparatus 101A holds handover type information (step S422).

  In addition, after receiving the RRC connection reconfiguration instruction, the radio terminal apparatus 202 holds the ECGI of the radio base station apparatus 101A that is the handover source and handover type information (step S423).

  Next, when the RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C, the wireless terminal device 202 transmits an RRC connection reconfiguration complete notification (RRC Connection Reconfiguration Complete) to the wireless base station device 101C. (Step S424).

  Next, 101 C of radio base station apparatuses start a timer in order to measure the residence time in the cell CC of the radio | wireless terminal apparatus 202 (step S425).

  Here, before transmitting the measurement result notification (Measurement Report) to the radio base station apparatus 101C, the radio terminal apparatus 202 moves out of the cell CC and into the cell CB. Then, the radio terminal apparatus 202 has a large interference of radio signals transmitted from the radio base station apparatus 101B, and cannot communicate with the radio base station apparatus 101C, so that RLF occurs (step S426).

  Next, when detecting the occurrence of RLF, the wireless terminal device 202 searches for nearby wireless base station devices by measuring the reception power of the wireless signal or the like. In this case, since the reception power of the radio signal from the radio base station apparatus 101B is maximized, the radio terminal apparatus 202 receives an RRC connection reestablishment request (RRC Connection) in order to reconnect to the searched radio base station apparatus 101B. Reestablishment Request) is transmitted to the radio base station apparatus 101B (step S427).

  Next, as in the sequence shown in FIG. 9 for example, RRC connection re-establishment rejection is transmitted from the radio base station apparatus 101C to the radio terminal apparatus 202, and the normal connection procedure with the radio base station apparatus 101C by the radio terminal apparatus 202 is performed. After that, an RRC connection is established between the wireless terminal device 202 and the wireless base station device 101C.

  Then, the radio base station apparatus 101B receives the RRC connection reconfiguration completion notification including “rlf-InfoAvailable” from the radio terminal apparatus 202, recognizes that an RLF has occurred in the radio terminal apparatus 202, and performs RLF In order to acquire the detailed information, a terminal information request (UE Information Request) is transmitted to the wireless terminal device 202.

  Next, the wireless terminal device 202 receives the terminal information request from the wireless base station device 101B, and transmits a terminal information response (UE Information Response) including the RLF report to the wireless base station device 101B (step S428).

  Here, the RLF report includes, for example, the PCI of the radio base station apparatus in which the RLF has occurred, the PCI and ECGI of the radio base station apparatus in which the RRC connection re-establishment has occurred, and the C-RNTI of the own radio terminal apparatus 202. Here, the PCI of the RLF generation is the ID of the radio base station apparatus 101C, the PCI and ECGI of the RRC connection re-establishment are the ID of the radio base station apparatus 101B, and the C-RNTI is assigned by the radio base station apparatus 101B ID. Further, the RLF report is transmitted from the radio base station apparatus 101A, which is the connection destination two previous to the radio terminal apparatus 202, that is, the radio terminal apparatus 202 established the RRC connection before the radio base station apparatus 101C. This includes handover type information of a handover operation to 101C, and PCI and ECGI of the radio base station apparatus 101A.

  Next, the radio base station apparatus 101B recognizes that RLF has occurred in the radio base station apparatus 101C by referring to the PCI of the radio base station apparatus 101C indicated by the RLF report received from the radio terminal apparatus 202, and the cell It is determined that “Too Late HO” has occurred to the CB. Then, the radio base station apparatus 101B transmits an RLF notification (RLF INDICATION) including the contents of the RLF report to the radio base station apparatus 101C via the X2 interface in order to notify that it is “Too Late HO” ( Step S429).

  Next, upon receiving the RLF notification from the radio base station apparatus 101B, the radio base station apparatus 101C checks the timer that has been started. If the timer is operating, that is, a predetermined time has elapsed since the timer was started. If not, it is determined that it is not “Too Late HO” to the cell CB, and since the RLF notification is received from the radio base station apparatus 101B other than the radio base station apparatus 101A, It is determined that it is not “Too Early HO” but “HO to Wron Cell” to the cell CC. When the radio base station apparatus 101C receives the RLF notification from the radio base station apparatus 101B, if the timer is not operating, that is, if the predetermined time has elapsed since the timer was started, the cell CB And “Too Late HO”.

  If the radio base station apparatus 101C determines that it is “HO to Wong Cell” for the cell CC, the radio base station apparatus 101C transmits a handover report including the contents of the RLF notification to the radio base station apparatus 101A. The handover report includes, for example, a parameter “Handover Report Type”. The radio base station apparatus 101C notifies the radio base station apparatus 101A of “HO to Wron Cell” by setting this parameter to a predetermined value (step S410).

  Next, the radio base station apparatus 101A receives the handover report from the radio base station apparatus 101C, recognizes that “HO to Wong Cell” has occurred in the cell CC, and generates “HO to Wong Cell”. In order to be suppressed, the optimization process of the handover operation is executed.

  More specifically, the radio base station apparatus 101A performs handover of the PCI and ECGI of the connection destination radio base station apparatus 101 immediately before the radio terminal apparatus 202 and the radio base station apparatus 101, which are included in the handover report. The handover type information of the original handover operation is collated with its own PCI and ECGI, and the held handover type information.

  Then, since the content of the handover report matches the held content, the radio base station apparatus 101A optimizes the handover operation of the type indicated by the held handover type information, for example, executes the handover operation Correct the reference. That is, the radio base station apparatus 101A sets parameters so that the timing of the handover operation is delayed. Specifically, for example, the hysteresis HS is increased, the TTT is increased, or the offset OST is decreased (step S431).

  As described above, in the example illustrated in FIG. 40, the radio base station apparatus 101 transmits the RRC connection reconfiguration instruction including the handover type information indicating the type of the handover operation, and the radio terminal apparatus 202 transmits the handover type information and the relevant information. The identification information of the radio base station apparatus 101 is held, and when the RLF occurs, it is reported to the radio base station apparatus 101 by an RLF report. That is, the radio base station has a configuration in which the identification information of the radio base station apparatus 101 that is the connection destination immediately before the radio terminal apparatus 202 and the type of handover operation that uses the radio base station apparatus 101 as a handover source are included in the RLF report. In the device 101, it is possible to recognize what type of handover operation is “HO to Wron Cell”.

  That is, in the example shown in FIG. 40, the holding unit 11 holds the type of the handover operation when the handover operation of its own radio terminal device 202 is performed from the radio base station device 101A to the radio base station device 101C. .

  Then, when the communication unit 12 restarts communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C, for example, When the reconnection operation is performed, the radio base station apparatus 101 is notified of the type of the handover operation held by the holding unit 11.

  Further, for example, when the handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed, the holding unit 11 performs base station identification information such as ECGI of the wireless base station device 101A. Hold.

  Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When performing a handover operation to the base station, the base station identification information held by the holding unit 11 is notified to the radio base station apparatus 101.

  Also, for example, even when the radio base station apparatus 101A that selects itself as the communication destination completes the handover operation to the radio base station apparatus 101C, the radio base station apparatus 101A retains the type of the handover operation.

  Then, the wireless base station device 101A acquires the base station identification information and the type of handover operation notified by the wireless terminal device 202, collates its own base station identification information with the acquired base station identification information, and matches. In this case, the type of the handover operation is used for timing control of the handover operation.

  In the configuration using the type of handover operation as described above, handover type information is stored in each message shown in FIGS. 37 to 39 instead of C-RNTI.

  Note that the notification unit 12 performs a new handover operation to the radio base station apparatus 101 after the handover operation to the radio base station apparatus 101C is completed in its own radio terminal apparatus 202, for example, as shown in FIG. When performing, it may be configured to notify the radio base station apparatus 101 of the type of handover operation held by the holding unit 11.

  Moreover, the radio | wireless terminal apparatus 202 may be the structure which hold | maintains C-RNTI with handover classification information, and includes it in a RLF report.

  Further, since the wireless terminal device 202 notifies the handover type information to the wireless base station device 101A, the wireless base station device 101A is configured not to hold the handover type information of the handover operation after the handover operation is performed. May be.

  In the example illustrated in FIG. 40, a configuration may be used in which the moving speed of the wireless terminal device 202 during the handover operation is used instead of the handover type information.

  That is, when the handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed, the holding unit 11 performs the wireless terminal device 202 of the wireless terminal device 202 when the handover operation is performed. Keep the moving speed of.

  Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When the handover operation to is performed, the radio base station apparatus 101 is notified of the moving speed held by the holding unit 11.

  Further, for example, when the handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed, the holding unit 11 performs base station identification information such as ECGI of the wireless base station device 101A. Hold.

  Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When performing a handover operation to the base station, the base station identification information held by the holding unit 11 is notified to the radio base station apparatus 101.

  Further, for example, even when the wireless base station device 101A completes a handover operation to the wireless base station device 101C of the wireless terminal device 202 that selects itself as a communication destination, the wireless terminal at the time when the handover operation is performed The moving speed of the device 202 is maintained.

  Then, the wireless base station device 101A acquires the base station identification information and the moving speed notified by the wireless terminal device 202, collates its own base station identification information with the acquired base station identification information, and if they match, The moving speed is used for timing control of the handover operation.

  In the configuration using the moving speed as described above, the moving speed is stored in each message shown in FIGS. 37 to 39 instead of the C-RNTI.

  As described above, in the radio communication system according to the second embodiment of the present invention, when the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101C, the radio base station It holds base station identification information such as ECGI of the device 101A and terminal identification information such as C-RNTI assigned from the radio base station device 101A. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. In addition, the base station identification information and terminal identification information held are notified to the radio base station apparatus 101. More specifically, in the wireless terminal device 202, the holding unit 11 performs the handover operation of its own wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C. It holds base station identification information such as ECGI and terminal identification information such as C-RNTI given from the wireless base station device 101A to its own wireless terminal device 202. Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When performing the handover operation to, the base station identification information and the terminal identification information held by the holding unit 11 are notified to the radio base station apparatus 101.

  With such a configuration, the wireless base station device 101A that had established a communication connection two times before the wireless terminal device 202 that caused an inappropriate handover operation has established a communication connection with itself. Among the wireless terminal devices 202, which wireless terminal device 202 has a problem in the handover operation can be specified. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  Also, in the radio communication system according to the second embodiment of the present invention, radio base station apparatus 101A has completed the handover operation to radio base station apparatus 101C of radio terminal apparatus 202 that selects itself as the communication destination. Also, the terminal identification information given to the wireless terminal device 202 is held.

  With such a configuration, the radio base station apparatus 101A can easily collate the terminal identification information provided by itself with the terminal identification information notified by the radio terminal apparatus 202.

  In the radio communication system according to the second embodiment of the present invention, radio base station apparatus 101A further holds the type of handover operation from self to radio base station apparatus 101C by radio terminal apparatus 202.

  With such a configuration, since the radio base station apparatus 101A can easily recognize the type of the handover operation in which the problem occurred, the inappropriate handover operation is analyzed in more detail, and the optimization process of the handover operation is performed. It can be done more appropriately. Further, since the wireless terminal device 202 does not need to hold the type of handover operation and notify the wireless base station device 101, the configuration and processing of the wireless terminal device 202 can be simplified.

  Further, in the wireless communication system according to the second embodiment of the present invention, the wireless base station device 101A further performs the handover operation when the wireless terminal device 202 performs a handover operation from itself to the wireless base station device 101C. The moving speed of the wireless terminal device 202 is held.

  With such a configuration, the radio base station apparatus 101A can easily recognize the moving speed of the radio terminal apparatus 202 during the problematic handover operation, so that an inappropriate handover operation can be analyzed in more detail. Therefore, the optimization process of the handover operation can be performed more appropriately. In addition, since the wireless terminal device 202 does not need to maintain the moving speed and notify the wireless base station device 101, the configuration and processing of the wireless terminal device 202 can be simplified.

  Further, in the radio communication system according to the second embodiment of the present invention, when the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101C, the handover operation is further performed. Holds the type. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. In addition, the radio base station apparatus 101 is notified of the type of the held handover operation.

  With such a configuration, since the radio base station apparatus 101A can easily recognize the type of the handover operation in which the problem occurred, the inappropriate handover operation is analyzed in more detail, and the optimization process of the handover operation is performed. It can be done more appropriately. In addition, since it is not necessary to hold the type of handover operation in the radio base station apparatus 101, the configuration and processing of the radio base station apparatus 101 can be simplified.

  In the radio communication system according to the second embodiment of the present invention, when the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101C, the handover operation is further performed. Maintains your speed of movement when done. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. In addition, the mobile base station apparatus 101 is notified of the held moving speed.

  With such a configuration, the radio base station apparatus 101A can easily recognize the moving speed of the radio terminal apparatus 202 during the problematic handover operation, so that an inappropriate handover operation can be analyzed in more detail. Therefore, the optimization process of the handover operation can be performed more appropriately. In addition, since it is not necessary to maintain the moving speed in the radio base station apparatus 101, the configuration and processing of the radio base station apparatus 101 can be simplified.

  In the radio communication system according to the second embodiment of the present invention, when the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101C, the type of the handover operation is set. Hold. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. In addition, the wireless base station apparatus 101 is notified of the type of the retained handover operation. More specifically, in the wireless terminal device 202, the holding unit 11 determines the type of handover operation when a handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed. Hold. Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When performing the handover operation to, the radio base station apparatus 101 is notified of the type of the handover operation held by the holding unit 11.

  With such a configuration, the radio base station apparatus 101A in which the radio terminal apparatus 202 has established a communication connection two times ago, which caused an inappropriate handover operation, performs handover operation with itself as the handover destination. It is possible to specify which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  Also, in the radio communication system according to the second embodiment of the present invention, radio base station apparatus 101A has completed the handover operation to radio base station apparatus 101C of radio terminal apparatus 202 that selects itself as the communication destination. Also holds the type of the handover operation.

  With such a configuration, the radio base station apparatus 101A can easily collate the type of handover operation that it has determined to execute in the past with the type of handover operation notified by the radio terminal apparatus 202.

  Further, in the radio communication system according to the second embodiment of the present invention, when radio terminal apparatus 202 performs a handover operation from radio base station apparatus 101A to radio base station apparatus 101C, radio base station apparatus It holds base station identification information such as 101A ECGI. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. Further, the radio base station apparatus 101 is notified of the stored base station identification information.

  With such a configuration, the radio base station apparatus 101A can more easily collate the type of handover operation that it has made a determination of in the past with the type of handover operation notified by the radio terminal apparatus 202.

  In the radio communication system according to the second embodiment of the present invention, when the radio terminal apparatus 202 performs a handover operation from the radio base station apparatus 101A to the radio base station apparatus 101C, the handover operation is performed. Maintains its own movement speed when hitting. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. In addition, the mobile base station apparatus 101 is notified of the held moving speed. More specifically, in the wireless terminal device 202, the holding unit 11 performs the handover operation when the handover operation of the wireless terminal device 202 from the wireless base station device 101A to the wireless base station device 101C is performed. The moving speed of its own wireless terminal device 202 is maintained. Then, the notification unit 12 restarts the communication with the radio base station apparatus 101 in its own radio terminal apparatus 202 after completion of the handover operation to the radio base station apparatus 101C or newly establishes the radio base station apparatus 101. When the handover operation to is performed, the radio base station apparatus 101 is notified of the moving speed held by the holding unit 11.

  With such a configuration, the radio base station apparatus 101A in which the radio terminal apparatus 202 has established a communication connection two times ago, which caused an inappropriate handover operation, performs handover operation with itself as the handover destination. It is possible to specify which type of handover operation has a problem. As a result, detailed analysis of an inappropriate handover operation, appropriate timing control of the handover operation using the analysis result, and the like can be performed, and communication can be stabilized.

  Also, in the radio communication system according to the second embodiment of the present invention, radio base station apparatus 101A has completed the handover operation to radio base station apparatus 101C of radio terminal apparatus 202 that selects itself as the communication destination. In addition, the moving speed of the wireless terminal device 202 when the handover operation is performed is held.

  With such a configuration, the radio base station apparatus 101A can easily collate the movement speed of the radio terminal apparatus 202 and the movement speed notified by the radio terminal apparatus 202 during the handover operation in which the self-determined execution has been performed. Therefore, it is possible to easily recognize the type of handover operation that has a problem.

  Further, in the radio communication system according to the second embodiment of the present invention, when radio terminal apparatus 202 performs a handover operation from radio base station apparatus 101A to radio base station apparatus 101C, radio base station apparatus It holds base station identification information such as 101A ECGI. Then, after completing the handover operation to the radio base station apparatus 101C, the radio terminal apparatus 202 newly resumes communication with the radio base station apparatus 101 or newly performs a handover operation to the radio base station apparatus 101. Further, the radio base station apparatus 101 is notified of the stored base station identification information.

  With such a configuration, the radio base station apparatus 101A can further easily collate the movement speed of the radio terminal apparatus 202 and the movement speed notified by the radio terminal apparatus 202 during the handover operation in which the self-execution has been determined in the past Therefore, it is possible to more easily recognize the type of handover operation that has a problem.

  In the radio communication system according to the second embodiment of the present invention, the radio terminal apparatus 202 is configured to acquire the handover type information from the radio base station apparatus 101. However, the present invention is not limited to this. . The radio terminal apparatus 202 may be configured to create and hold handover type information indicating the type of its own handover operation and report it to the radio base station apparatus 101 by including it in the RLF report.

  Further, in the wireless communication system according to the second embodiment of the present invention, the wireless terminal apparatus 202 is configured to acquire its own moving speed from the wireless base station apparatus 101, but the present invention is not limited to this. Absent. The radio terminal apparatus 202 may be configured to measure and hold its own moving speed and report it to the radio base station apparatus 101 in an RLF report.

  Since other configurations and operations are the same as those of the wireless communication system according to the first embodiment, detailed description thereof will not be repeated here.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 11 Holding part 12 Notification part 81 Antenna 82 Circulator 83 Wireless receiving part 84 Wireless transmission part 85 Signal processing part 86 Reception signal processing part 87 Transmission signal processing part 88 Control part 89 Input / output part 91 Antenna 92 Circulator 93 Wireless receiving part 94 Wireless transmission Unit 95 signal processing unit 96 reception signal processing unit 97 transmission signal processing unit 98 control unit 101A, 101B, 101C radio base station apparatus 202 radio terminal apparatus

Claims (57)

A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination,
The radio terminal device performs base operation of the first radio base station device when performing a handover operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices. Holding station identification information and terminal identification information given from the first radio base station apparatus,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus A radio communication system for notifying the radio base station apparatus of the held base station identification information and the terminal identification information.   The first radio base station apparatus selects the terminal identification given to the radio terminal apparatus even when a handover operation of the radio terminal apparatus that selects itself as a communication destination to the second radio base station apparatus is completed The wireless communication system according to claim 1, which retains information.   The radio communication system according to claim 2, wherein the first radio base station apparatus further holds a type of a handover operation from the radio terminal apparatus to the second radio base station apparatus.   The first radio base station apparatus further maintains a moving speed of the radio terminal apparatus when a handover operation from the radio terminal apparatus to the second radio base station apparatus is performed by the radio terminal apparatus. A wireless communication system according to claim 2 or claim 3. When the wireless terminal device performs a handover operation from the first wireless base station device to the second wireless base station device, the wireless terminal device further holds the type of the handover operation,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus Furthermore, the radio | wireless communications system of any one of Claims 1-4 which notifies the classification of the said hold | maintained operation | movement to the said radio base station apparatus. When performing a handover operation from the first radio base station apparatus to the second radio base station apparatus, the radio terminal apparatus further maintains its own moving speed when the handover operation is performed. ,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus Furthermore, the radio | wireless communications system of any one of Claims 1-5 which notifies the said movement speed hold | maintained to the said radio base station apparatus. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
The wireless terminal device holds a type of the handover operation when performing a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus A radio communication system that notifies the radio base station apparatus of the type of the held handover operation.   The first radio base station apparatus retains a type of the handover operation even when a handover operation of the radio terminal apparatus that selects itself as a communication destination to the second radio base station apparatus is completed. Item 8. The wireless communication system according to Item 7. When performing a handover operation from the first radio base station apparatus to the second radio base station apparatus, the radio terminal apparatus further holds base station identification information of the first radio base station apparatus ,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus Furthermore, the radio | wireless communications system of Claim 7 or Claim which notifies the said base station identification information hold | maintained to the said radio base station apparatus. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
The wireless terminal device, when performing a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, Keeps moving speed of
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus A radio communication system that notifies the radio base station apparatus of the movement speed that is held.   The first radio base station apparatus selects the self-communication destination as a communication destination even when a handover operation to the second radio base station apparatus is completed, the handover is performed when the handover operation is performed. The wireless communication system according to claim 10, wherein the moving speed of the wireless terminal device is maintained. When performing a handover operation from the first radio base station apparatus to the second radio base station apparatus, the radio terminal apparatus further holds base station identification information of the first radio base station apparatus ,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completing the handover operation to the second radio base station apparatus, or when performing a new handover operation to the radio base station apparatus Furthermore, the radio | wireless communications system of Claim 10 or Claim which notifies the said base station identification information hold | maintained to the said radio base station apparatus. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination,
When the radio terminal device performs a moving operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices, the base station of the first radio base station device Holding station identification information and terminal identification information given from the first radio base station apparatus,
The first radio base station apparatus measures an elapsed time from the timing of the movement operation of the radio terminal apparatus that has been selected as a communication destination to the second radio base station apparatus,
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or when performing a new moving operation to the wireless base station device Notifies the stored base station identification information and the terminal identification information to the radio base station device,
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted A wireless communication system. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination,
When the radio terminal device performs a moving operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices, the base station of the first radio base station device Holding station identification information and terminal identification information given from the first radio base station apparatus,
The first radio base station apparatus measures an elapsed time from the timing of the movement operation of the radio terminal apparatus that has been selected as a communication destination to the second radio base station apparatus,
The wireless terminal device may newly resume communication with the wireless base station device after completion of the moving operation to the second wireless base station device or perform a moving operation to the wireless base station device. When the held base station identification information of the first radio base station apparatus and the base station identification information of the radio base station apparatus to be newly selected as a communication destination match, the held terminal identification information is Notify the radio base station device,
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and the If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio A radio communication system for adjusting a timing of a moving operation from the first radio base station apparatus to the second radio base station apparatus by a terminal device.   The first radio base station apparatus selects the terminal identification assigned to the radio terminal apparatus even when the movement operation of the radio terminal apparatus selecting itself as a communication destination to the second radio base station apparatus is completed The wireless communication system according to claim 13 or 14, wherein the information is retained and the terminal identification information is erased when the elapsed time exceeds the predetermined value.   The wireless terminal device, when notifying the base station identification information and the terminal identification information to the wireless base station device, or after elapse of a predetermined time from the timing of the mobile operation to the second wireless base station device, The radio communication system according to claim 13, wherein the held base station identification information and terminal identification information are erased.   The wireless terminal apparatus holds the base station identification when the terminal identification information is notified to the wireless base station apparatus or after a predetermined time has elapsed from the timing of the moving operation to the second wireless base station apparatus. The wireless communication system according to claim 14, wherein the information and the terminal identification information are erased.   18. The radio terminal apparatus according to claim 13, wherein the radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a connection operation to the radio base station apparatus or immediately after completion of the connection operation. The wireless communication system according to 1.   The radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a reconnection operation to the radio base station apparatus or immediately after completion of the reconnection operation. The wireless communication system according to item 1.   The radio terminal apparatus transmits the terminal identification information to the radio base station apparatus during a handover operation to the radio base station apparatus or immediately after the handover operation is completed. The wireless communication system according to item.   The radio communication system according to any one of claims 13 to 17, wherein the radio terminal device transmits the terminal identification information to the radio base station device in response to a request from the radio base station device.   When the elapsed time is less than a predetermined value, the first radio base station device sends the same terminal identification information as the assigned terminal identification information to a radio terminal device that newly selects itself as a communication destination. The wireless communication system according to any one of claims 13 to 21, which is not provided.   The wireless terminal device retains when one of the number of executions of the handover operation, the number of executions of the connection operation and the number of executions of the reconnection operation, or the total of a combination of at least any two exceeds a predetermined number of times. The wireless communication system according to any one of claims 13 to 22, wherein the terminal identification information is deleted. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
When the radio terminal device performs a moving operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices, the base station of the first radio base station device Holds station identification information,
The wireless terminal device measures an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device,
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or starts a new moving operation to the wireless base station device When the stored base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, and the elapsed time is less than a predetermined value To notify the wireless base station device of predetermined information,
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus and the second radio base station apparatus by the radio terminal apparatus A wireless communication system that determines that the moving operation of the wireless terminal device is inappropriate or adjusts the timing of the moving operation from the first wireless base station device to the second wireless base station device by the wireless terminal device.   The radio terminal apparatus according to claim 24, wherein the radio terminal apparatus deletes the stored base station identification information when the radio base station apparatus is notified of the predetermined information, or when the elapsed time exceeds the predetermined value. Communications system. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
When the radio terminal device performs a moving operation from the first radio base station device to the second radio base station device among the plurality of radio base station devices, the base station of the first radio base station device Holds station identification information,
The wireless terminal device measures an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device,
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or starts a new moving operation to the wireless base station device In the case where the elapsed time is less than a predetermined value, the stored base station identification information is notified to the radio base station device,
The first radio base station apparatus receives the notification from the radio terminal apparatus, and when the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal A radio communication system that determines that a movement operation from the first radio base station apparatus to the second radio base station apparatus by an apparatus is inappropriate.   27. The radio terminal apparatus according to claim 26, wherein the radio terminal apparatus deletes the held base station identification information when the base station identification information is notified to the radio base station apparatus or when the elapsed time is equal to or greater than the predetermined value. Wireless communication system. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The first radio base station apparatus acquires terminal identification information of the radio terminal apparatus that selects itself as a communication destination from apparatuses other than the self,
The first radio base station apparatus measures an elapsed time from the timing of the moving operation of the radio terminal apparatus that has been selected as a communication destination to the second radio base station apparatus,
The wireless terminal device newly restarts communication with the wireless base station device after the completion of the movement operation from the first wireless base station device to the second wireless base station device, or a new wireless base station When performing a movement operation to the device, notify the wireless base station device of its own terminal identification information,
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the acquired terminal identification information, and the elapsed time Is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or the radio terminal apparatus A radio communication system that adjusts the timing of a moving operation from the first radio base station device to the second radio base station device according to the above.   The first radio base station apparatus selects the terminal identification information of the radio terminal apparatus even when the movement operation of the radio terminal apparatus that selects itself as a communication destination to the second radio base station apparatus is completed. 29. The wireless communication system according to claim 28, wherein the terminal identification information is deleted when the elapsed time exceeds the predetermined value. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination, and from the self by the radio terminal apparatus that has selected itself as a communication destination to another radio base station apparatus Measure the elapsed time from the timing of the movement movement of
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination, and the terminal identification information given from the wireless base station device for a predetermined period,
The wireless terminal device resumes communication with the wireless base station device after completion of the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. In the case of performing or newly moving to the radio base station device, the held base station identification information and the terminal identification information is notified to the radio base station device,
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted A wireless communication system. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination, and from the self by the radio terminal apparatus that has selected itself as a communication destination to another radio base station apparatus Measure the elapsed time from the timing of the movement movement of
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination, and the terminal identification information given from the wireless base station device for a predetermined period,
The wireless terminal device resumes communication with the wireless base station device after completion of the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information of the held first radio base station apparatus and the base station of the radio base station apparatus to be newly selected as the communication destination. When the station identification information matches, notify the radio base station apparatus of the held terminal identification information,
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and the If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio A radio communication system for adjusting a timing of a moving operation from the first radio base station apparatus to the second radio base station apparatus by a terminal device. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to the other wireless base station device. And
The wireless terminal device resumes communication with the wireless base station device after completion of the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information that has been held coincides with the base station identification information of the radio base station device that is newly selected as a communication destination, If the elapsed time from the timing of the movement operation to the second radio base station apparatus is less than a predetermined value, the predetermined information is notified to the radio base station apparatus,
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus and the second radio base station apparatus by the radio terminal apparatus A wireless communication system that determines that the moving operation of the wireless terminal device is inappropriate or adjusts the timing of the moving operation from the first wireless base station device to the second wireless base station device by the wireless terminal device. A wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can perform a moving operation to communicate with the plurality of wireless base station devices,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to the other wireless base station device. And
The wireless terminal device resumes communication with the wireless base station device after completion of the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. Held when the elapsed time from the timing of the moving operation to the second radio base station apparatus is less than a predetermined value when starting the moving operation to the radio base station apparatus Notifying the base station identification information to the radio base station device,
The first radio base station apparatus receives the notification from the radio terminal apparatus, and when the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the second radio terminal apparatus performs the second operation from the first radio base station apparatus. A wireless communication system that adjusts the timing of the moving operation to the wireless base station device. A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
The radio base station apparatus gives terminal identification information to a radio terminal apparatus that selects itself as a communication destination,
Among the plurality of radio base station apparatuses, when a handover operation of the own radio terminal apparatus from the first radio base station apparatus to the second radio base station apparatus is performed, the first radio base station apparatus A holding unit for holding base station identification information and terminal identification information given from the first radio base station apparatus to its own radio terminal apparatus;
After completion of the handover operation to the second radio base station apparatus, when the communication with the radio base station apparatus is newly resumed or the handover operation to the radio base station apparatus is newly performed in the own radio terminal apparatus And a notifying unit for notifying the radio base station device of the base station identification information and the terminal identification information held by the holding unit. A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
To hold the type of the handover operation when a handover operation of its own radio terminal device from the first radio base station device to the second radio base station device is performed among the plurality of radio base station devices A holding part,
After completion of the handover operation to the second radio base station apparatus, when the communication with the radio base station apparatus is newly resumed or the handover operation to the radio base station apparatus is newly performed in the own radio terminal apparatus And a notification unit for notifying the radio base station apparatus of the type of the handover operation held by the holding unit. A wireless terminal device capable of communicating with a plurality of wireless base station devices by performing a handover operation,
Among the plurality of radio base station devices, when the handover operation of the own radio terminal device from the first radio base station device to the second radio base station device is performed, the handover operation is performed. A holding unit for holding the moving speed of its own wireless terminal device;
After completion of the handover operation to the second radio base station apparatus, when the communication with the radio base station apparatus is newly resumed or the handover operation to the radio base station apparatus is newly performed in the own radio terminal apparatus And a notifying unit for notifying the radio base station device of the moving speed held by the holding unit. A communication control method in a wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
When the radio terminal apparatus performs a handover operation from the first radio base station apparatus to the second radio base station apparatus among the plurality of radio base station apparatuses, the base of the first radio base station apparatus Holding station identification information and terminal identification information given from the first radio base station apparatus;
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completion of the handover operation to the second radio base station apparatus or newly performs a handover operation to the radio base station apparatus And notifying the stored base station identification information and terminal identification information to the radio base station apparatus. A communication control method in a wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
Holding the type of the handover operation when the wireless terminal device performs a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices; ,
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completion of the handover operation to the second radio base station apparatus or newly performs a handover operation to the radio base station apparatus And a step of notifying the radio base station apparatus of the type of the held handover operation. A communication control method in a wireless communication system comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a handover operation,
When the wireless terminal device performs a handover operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the wireless terminal device performs self-handling when the handover operation is performed. Maintaining a moving speed of
When the radio terminal apparatus newly resumes communication with the radio base station apparatus after completion of the handover operation to the second radio base station apparatus or newly performs a handover operation to the radio base station apparatus And a step of notifying the wireless base station device of the held moving speed. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information and terminal identification information given from the first radio base station apparatus;
The first radio base station apparatus measuring an elapsed time from the timing of the movement operation of the radio terminal apparatus that has selected itself as a communication destination to the second radio base station apparatus;
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or when performing a new moving operation to the wireless base station device Notifying the stored base station identification information and the terminal identification information to the radio base station device;
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted A communication control method. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The wireless base station device giving terminal identification information to the wireless terminal device selecting itself as a communication destination;
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information and terminal identification information given from the first radio base station apparatus;
The first radio base station apparatus measuring an elapsed time from the timing of the movement operation of the radio terminal apparatus that has selected itself as a communication destination to the second radio base station apparatus;
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or when performing a new moving operation to the wireless base station device. When the held base station identification information of the first radio base station apparatus and the base station identification information of the radio base station apparatus to be newly selected as a communication destination match, the held terminal identification information is Notifying the radio base station device;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio Adjusting a timing of a moving operation from the first radio base station apparatus to the second radio base station apparatus by a terminal device. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information;
The wireless terminal device measuring an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device;
When the radio terminal device newly resumes communication with the radio base station device after the completion of the move operation to the second radio base station device or starts a new move operation to the radio base station device When the stored base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, and the elapsed time is less than a predetermined value A step of notifying the radio base station apparatus of predetermined information;
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus Determining that the moving operation of the wireless terminal device is inappropriate or adjusting the timing of the moving operation from the first wireless base station device to the second wireless base station device by the wireless terminal device. Control method. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information;
The wireless terminal device measuring an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device;
When the radio terminal device newly resumes communication with the radio base station device after the completion of the move operation to the second radio base station device or starts a new move operation to the radio base station device When the elapsed time is less than a predetermined value, notifying the stored base station identification information to the radio base station device,
When the first radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the second radio terminal apparatus performs the second operation from the first radio base station apparatus. Adjusting the timing of the moving operation to the radio base station apparatus. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The first radio base station apparatus acquires terminal identification information of the radio terminal apparatus selecting itself as a communication destination from an apparatus other than the self;
The first radio base station apparatus measuring an elapsed time from the timing of the moving operation of the radio terminal apparatus that has been selected as a communication destination to the second radio base station apparatus;
When the radio terminal device newly resumes communication with the radio base station device after completion of the movement operation from the first radio base station device to the second radio base station device, or a new radio base station In the case of performing a movement operation to the device, the step of notifying the radio base station device of its own terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the acquired terminal identification information, and the elapsed time Is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or the radio terminal apparatus Adjusting the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus according to the above. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The wireless base station device measuring the elapsed time from the timing of the moving operation from self to another wireless base station device by the wireless terminal device that has been selected as a communication destination;
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination and the terminal identification information given from the wireless base station device for a predetermined period;
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. In the case of performing or newly performing a moving operation to the radio base station apparatus, notifying the radio base station apparatus of the held base station identification information and the terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted A communication control method. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination, and from the self by the radio terminal apparatus that has selected itself as a communication destination to another radio base station apparatus Measuring the elapsed time from the timing of the moving movement of
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination and the terminal identification information given from the wireless base station device for a predetermined period;
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information of the held first radio base station apparatus and the base station of the radio base station apparatus to be newly selected as the communication destination. When the station identification information matches, the step of notifying the radio base station apparatus of the held terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio Adjusting a timing of a moving operation from the first radio base station apparatus to the second radio base station apparatus by a terminal device. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to another wireless base station device. And steps to
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information that has been held coincides with the base station identification information of the radio base station device that is newly selected as a communication destination, If the elapsed time from the timing of the moving operation to the second radio base station apparatus is less than a predetermined value, the step of notifying the radio base station apparatus of predetermined information;
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus Determining that the moving operation of the wireless terminal device is inappropriate or adjusting the timing of the moving operation from the first wireless base station device to the second wireless base station device by the wireless terminal device. Control method. A communication control method in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device performs a moving operation and can communicate with the plurality of radio base station devices,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to another wireless base station device. And steps to
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. Held when the elapsed time from the timing of the moving operation to the second radio base station apparatus is less than a predetermined value when starting the moving operation to the radio base station apparatus Notifying the base station identification information to the radio base station device,
When the first radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the second radio terminal apparatus performs the second operation from the first radio base station apparatus. Adjusting the timing of the moving operation to the radio base station apparatus. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information and terminal identification information given from the first radio base station apparatus;
The first radio base station apparatus measuring an elapsed time from the timing of the movement operation of the radio terminal apparatus that has selected itself as a communication destination to the second radio base station apparatus;
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or when performing a new moving operation to the wireless base station device Notifying the stored base station identification information and the terminal identification information to the radio base station device;
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted And a communication control program for executing the step. A communication control program in a wireless communication system, comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a movement operation, ,
The wireless base station device giving terminal identification information to the wireless terminal device selecting itself as a communication destination;
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information and terminal identification information given from the first radio base station apparatus;
The first radio base station apparatus measuring an elapsed time from the timing of the movement operation of the radio terminal apparatus that has selected itself as a communication destination to the second radio base station apparatus;
When the wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation to the second wireless base station device, or when performing a new moving operation to the wireless base station device. When the held base station identification information of the first radio base station apparatus and the base station identification information of the radio base station apparatus to be newly selected as a communication destination match, the held terminal identification information is Notifying the radio base station device;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio A communication control program for causing a terminal device to execute a step of adjusting a timing of a moving operation from the first radio base station device to the second radio base station device. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information;
The wireless terminal device measuring an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device;
When the radio terminal device newly resumes communication with the radio base station device after the completion of the move operation to the second radio base station device or starts a new move operation to the radio base station device When the stored base station identification information of the first radio base station apparatus matches the base station identification information of the radio base station apparatus newly selected as the communication destination, and the elapsed time is less than a predetermined value A step of notifying the radio base station apparatus of predetermined information;
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus To adjust the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus. Communication control program. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
When the wireless terminal device performs a moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices, the base of the first wireless base station device Holding station identification information;
The wireless terminal device measuring an elapsed time from the timing of the movement operation of the wireless terminal device to the second wireless base station device;
When the radio terminal device newly resumes communication with the radio base station device after the completion of the move operation to the second radio base station device or starts a new move operation to the radio base station device When the elapsed time is less than a predetermined value, notifying the stored base station identification information to the radio base station device,
When the first radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the second radio terminal apparatus performs the second operation from the first radio base station apparatus. The communication control program for executing the step of adjusting the timing of the moving operation to the radio base station apparatus. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
The first radio base station apparatus acquires terminal identification information of the radio terminal apparatus selecting itself as a communication destination from an apparatus other than the self;
The first radio base station apparatus measuring an elapsed time from the timing of the moving operation of the radio terminal apparatus that has been selected as a communication destination to the second radio base station apparatus;
When the radio terminal device newly resumes communication with the radio base station device after completion of the movement operation from the first radio base station device to the second radio base station device, or a new radio base station In the case of performing a movement operation to the device, the step of notifying the radio base station device of its own terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the acquired terminal identification information, and the elapsed time Is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or the radio terminal apparatus And a step of adjusting the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
The wireless base station device measuring the elapsed time from the timing of the moving operation from self to another wireless base station device by the wireless terminal device that has been selected as a communication destination;
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination and the terminal identification information given from the wireless base station device for a predetermined period;
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. In the case of performing or newly performing a moving operation to the radio base station apparatus, notifying the radio base station apparatus of the held base station identification information and the terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, and the base station identification information notified from the radio terminal apparatus matches its own identification information, and is notified from the radio terminal apparatus. When the received terminal identification information matches the terminal identification information given by itself and the elapsed time is less than a predetermined value, the first radio base station apparatus by the radio terminal apparatus It is determined that the movement operation to the second radio base station apparatus is inappropriate or the timing of the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is adjusted And a communication control program for executing the step. A communication control program in a wireless communication system, comprising a wireless terminal device and a plurality of wireless base station devices, wherein the wireless terminal device can communicate with the plurality of wireless base station devices by performing a movement operation, ,
The radio base station apparatus gives terminal identification information to the radio terminal apparatus that selects itself as a communication destination, and from the self by the radio terminal apparatus that has selected itself as a communication destination to another radio base station apparatus Measuring the elapsed time from the timing of the moving movement of
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination and the terminal identification information given from the wireless base station device for a predetermined period;
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information of the held first radio base station apparatus and the base station of the radio base station apparatus to be newly selected as the communication destination. When the station identification information matches, the step of notifying the radio base station apparatus of the held terminal identification information;
The first radio base station apparatus receives the notification from the radio terminal apparatus, the terminal identification information notified from the radio terminal apparatus matches the terminal identification information provided by itself, and If the elapsed time is less than a predetermined value, it is determined that the movement operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus is inappropriate, or radio A communication control program for causing a terminal device to execute a step of adjusting a timing of a moving operation from the first radio base station device to the second radio base station device. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to another wireless base station device. And steps to
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. The base station identification information that has been held coincides with the base station identification information of the radio base station device that is newly selected as a communication destination, If the elapsed time from the timing of the moving operation to the second radio base station apparatus is less than a predetermined value, the step of notifying the radio base station apparatus of predetermined information;
The first radio base station apparatus receives the notification including the predetermined information from the radio terminal apparatus, and the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus To adjust the timing of the moving operation from the first radio base station apparatus to the second radio base station apparatus by the radio terminal apparatus. Communication control program. A communication control program used in a radio communication system comprising a radio terminal device and a plurality of radio base station devices, wherein the radio terminal device can communicate with the plurality of radio base station devices by performing a moving operation, On the computer,
The wireless terminal device holds the base station identification information of the wireless base station device selected by itself as a communication destination for a predetermined period, and measures the elapsed time from the timing of the moving operation to another wireless base station device. And steps to
The wireless terminal device newly resumes communication with the wireless base station device after completing the moving operation from the first wireless base station device to the second wireless base station device among the plurality of wireless base station devices. Held when the elapsed time from the timing of the moving operation to the second radio base station apparatus is less than a predetermined value when starting the moving operation to the radio base station apparatus Notifying the base station identification information to the radio base station device,
When the first radio base station apparatus receives the notification from the radio terminal apparatus and the base station identification information notified from the radio terminal apparatus matches its own identification information, the radio terminal It is determined that the moving operation from the first radio base station apparatus to the second radio base station apparatus by the apparatus is inappropriate, or the second radio terminal apparatus performs the second operation from the first radio base station apparatus. The communication control program for executing the step of adjusting the timing of the moving operation to the radio base station apparatus.

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