JP2012050039A - Radio communication system, base station device, radio communication method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio communication system capable of detecting proximity of a second terminal device whose connection is not permitted to a first base station device to which only a first terminal device previously having received permission for connection can be connected.SOLUTION: A first base station device includes a handoff control unit that transmits a message rejecting a handoff request to a second base station device when it receives the handoff request requesting connection with a second terminal device from the second base station device; and a proximity determination unit that detects the number of the message transmission by the handoff control unit during the latest predetermined period, and determines that the second terminal device is located in a communication area of the own device when the detected transmission number is equal to or more than a predetermined threshold value, and that the second terminal device is not located in the communication area when the detected transmission number is less than the threshold value.

Description

  The present invention relates to a wireless communication system, a base station apparatus, a wireless communication method, and a program.

  Standardization organizations for wireless interfaces such as 3GPP (3rd Generation Partnership Project), 3GPP2 (3rd Generation Partnership Project 2), and IEEE 802.16 cover general macro base stations that cover a wide communication area, and cover a small amount of transmission power. Covered by micro base stations and pico base stations as well as micro base stations and pico base stations (hereinafter collectively referred to as macro base station devices (Macro e-Node B)). A femto base station that has a small communication area and a small capacity but is small and inexpensive has been studied (Non-Patent Documents 1, 2, and 3).

  The femto base station is assumed to be installed in a home, a store, an office, or the like, like a wireless LAN access point. While the communication carrier installs and manages the line between the macro base station device and the cellular network, the installer who installs the femto base station contracts between the femto base station and the cellular network. It is characterized in that it is connected to a network provider via a fixed access line and is installed and managed by a person other than the telecommunications carrier.

  In addition, in the femto base station, there is a mechanism in which only a terminal device (hereinafter referred to as a CSG (Closed Subscriber Group) terminal device) approved by the owner of the base station is permitted to connect to the base station. Terminal devices that are not recognized by the Femto base station (hereinafter referred to as non-CSG terminal devices) are not connected to the femto base station even if they are within the communication area (femto cell coverage area) covered by the femto base station. Since there is a base station that can perform such settings, hereinafter, a base station capable of such settings is referred to as a CSG base station apparatus (CSG e-Node B; CSG eNB).

3GPP TS36.331, “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC)” 3GPP TS36.413, “Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 Application Protocol (S1AP)” 3GPP TS36.423, “Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)”

  Since the CSG base station apparatus as described above is operated using the same frequency band as the macro base station apparatus, when a non-CSG terminal apparatus connected to the macro base station apparatus is close to the CSG base station apparatus, The non-CSG terminal apparatus may not be handed off to the CSG base station apparatus, but may receive strong interference from the CSG base station apparatus and cause a disconnection with the macro base station apparatus.

In order to avoid the disconnection of communication as described above, first, it is detected that a non-CSG terminal apparatus is in proximity to the CSG base station apparatus but cannot be handed off, and the macro base to which the non-CSG terminal apparatus is connected is detected. It is necessary to notify the station apparatus and the CSG base station apparatus.
That is, it is necessary to detect that a terminal device that is not permitted to connect is close to a base station device that can be connected only to a specific terminal device that is permitted in advance.

  The present invention has been made to solve the above problems, and its purpose is that a terminal device that is not permitted to be connected is close to a base station device that can be connected only to a specific terminal device that is permitted in advance. A radio communication system, a radio base station apparatus, a radio communication method, and a program can be detected.

  (1) In order to solve the above problem, the present invention provides a first base station apparatus, a first terminal apparatus that is permitted to connect to the first base station apparatus, and a connection to the first base station apparatus. And a second base station connected to the second terminal apparatus using the same frequency band as the first base station apparatus used for connection to the first terminal apparatus. When the first base station apparatus receives a handoff request for requesting connection with the second terminal apparatus from the second base station apparatus, the second base station apparatus A hand-off control unit that transmits a message rejecting the hand-off request, and the number of times the hand-off control unit has transmitted the message within the most recent predetermined period, and the number of detected transmissions is predetermined. When the threshold is exceeded When the second terminal apparatus determines that the second terminal apparatus is located within the communication area of the own apparatus and the detected number of transmissions is less than the threshold value, the second terminal apparatus is located within the communication area. And a proximity determination unit that determines that the wireless communication system is not present.

  (2) Further, in the present invention described in the above, the first base station device further includes a connection non-permission list storage unit that stores an index for identifying the second terminal device, and the proximity determination When the unit determines that the second terminal device is located within the communication area of the own device, the unit stores the index of the second terminal device in the connection disapproval list storage unit, and the handoff control unit issues a handoff request Each time a message rejecting the message is transmitted, it is determined whether or not the index of the second terminal device whose handoff is rejected by the message is stored in the connection disapproval list storage unit, and the index of the second terminal device is determined. Is stored in the connection rejection list storage unit, it is determined that the second terminal device is located within the communication area of the own device.

  (3) Further, the present invention provides a base station apparatus, a first terminal apparatus that is previously permitted to connect to the base station apparatus, a second terminal apparatus that is not permitted to connect to the base station apparatus, A base station apparatus in a wireless communication system comprising a first base station apparatus connected to the second terminal apparatus using the same frequency band as the base station apparatus used for connection to the first terminal apparatus. When receiving a handoff request for requesting connection with the second terminal device from the first base station device, a handoff control unit for transmitting a message rejecting the handoff request to the first base station device; Within a predetermined period, the number of times the handoff control unit transmits the message is detected, and when the detected number of transmissions is equal to or greater than a predetermined threshold, the second terminal device communicates with its own communication area. A proximity determination unit that determines that the second terminal apparatus is not located within the communication area when the number of transmissions detected is less than the threshold value. This is a base station apparatus.

  (4) Further, the present invention provides a first base station apparatus, a first terminal apparatus that is previously permitted to connect to the first base station apparatus, and a first terminal that is not permitted to connect to the first base station apparatus. A radio comprising: 2 terminal apparatus; and a second base station apparatus connected to the second terminal apparatus using the same frequency band as the first base station apparatus used for connection to the first terminal apparatus A wireless communication method in a communication system, wherein when the first base station apparatus receives a handoff request for requesting connection with the second terminal apparatus from the second base station apparatus, the first base station apparatus performs handoff to the second base station apparatus. A hand-off control step of transmitting a message rejecting the request; and detecting the number of times the first base station apparatus has transmitted the message in the hand-off control step within the most recent predetermined period. If the number of times is equal to or greater than a predetermined threshold, it is determined that the second terminal device is located in the communication area of the own device, and the number of detected transmissions is less than the threshold, A wireless communication method comprising: a proximity determination step for determining that the second terminal device is not located within the communication area.

  (5) Further, the present invention provides a first base station apparatus, a first terminal apparatus that is previously permitted to connect to the first base station apparatus, and a first terminal that is not permitted to connect to the first base station apparatus. A radio comprising: 2 terminal apparatus; and a second base station apparatus connected to the second terminal apparatus using the same frequency band as the first base station apparatus used for connection to the first terminal apparatus When the first base station apparatus receives a handoff request for requesting connection with the second terminal apparatus from the second base station apparatus to the computer provided in the first base station apparatus in the communication system, the first base station apparatus 2 a handoff control step of transmitting a message rejecting the handoff request to the base station device, and the first base station device has transmitted the message in the handoff control step within the latest predetermined period. If the number of detected transmissions is equal to or greater than a predetermined threshold value, it is determined that the second terminal device is located in the communication area of the own device, and the detected number of transmissions is And a proximity determination step for determining that the second terminal device is not located within the communication area when the threshold value is less than the threshold value.

  According to the present invention, it is possible to detect that a terminal device that is not permitted to connect is in proximity to a base station device to which only a specific terminal device permitted in advance can be connected.

1 is a schematic diagram illustrating a configuration example of a wireless communication system 1 in a first embodiment. It is a schematic block diagram which shows the structure of the CSG base station apparatus 100 in the embodiment. It is a schematic block diagram which shows the structure of the macro base station apparatus 200 in the embodiment. FIG. 6 is a sequence diagram showing an operation example of the wireless communication system 1 of the same embodiment. It is a schematic block diagram which shows the structure of the CSG base station apparatus 110 in 2nd Embodiment.

  Hereinafter, a radio communication system, a radio base station apparatus, a radio communication method, and a program according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic diagram illustrating a configuration example of a wireless communication system 1 according to the first embodiment. The wireless communication system 1 will be described using an example in which the LTE system of Non-Patent Documents 1 to 3 is applied. As shown in the figure, the wireless communication system 1 is connected to a non-CSG (closed subscriber group) terminal device 300, a CSG terminal device 301, a non-CSG terminal device 300, and a CSG terminal device 301 to communicate with each other. It includes a station apparatus 200, a CSG base station apparatus 100 that communicates with and communicates with a CSG terminal apparatus 301, and a network 5 that connects the CSG base station apparatus 100 and the macro base station apparatus 200 with wires.

In the figure, communication areas 100A and 200A indicated by broken lines indicate communication areas of the CSG base station apparatus 100 and the macro base station apparatus 200. Further, the CSG base station apparatus 100 is arranged in the communication area of the macro base station apparatus 200.
The CSG base station apparatus 100 communicates with the CSG terminal apparatus 301 using the same frequency band as that used by the macro base station apparatus 200 for communication with the non-CSG terminal apparatus 300 and the CSG terminal apparatus 301.
The CSG base station apparatus 100 is, for example, a pico base station or a femto base station with a small transmission power and a small communication area. Moreover, the macro base station apparatus 200 is a macro base station that covers a wide communication area, for example.

The non-CSG terminal device 300 communicates with other terminal devices by connecting to the macro base station device 200. Further, the non-CSG terminal apparatus 300 is a terminal apparatus that is not permitted to connect to the CSG base station apparatus 100.
The CSG terminal device 301 communicates with other terminal devices by connecting to the CSG base station device 100 or the macro base station device 200. The CSG terminal device 301 is different from the non-CSG terminal device 300 in that connection to the CSG base station device 100 is permitted.

    Hereinafter, a specific configuration for detecting that the non-CSG terminal apparatus 300 connected to the macro base station apparatus 200 is close to the CSG base station apparatus 100 and notifying the macro base station apparatus 200, and Processing will be described.

  FIG. 2 is a schematic block diagram showing the configuration of the CSG base station apparatus 100 in the present embodiment. The CSG base station apparatus 100 includes a connection permission list storage unit 101, a handoff control unit 102, a communication log storage unit 103, a non-CSG terminal apparatus proximity determination unit 104, and a wireless communication unit 105, as shown in FIG.

The connection permission list storage unit 101 stores in advance a list (white list) of indexes of terminal devices that are permitted to connect to the own device. The index of the terminal device is an identifier that is assigned to the terminal device in advance and uniquely identifies the terminal device.
The handoff control unit 102 receives, from the other base station device, a message including an index for identifying the terminal device and a handoff request (HO (Hand-Off) Request) of the terminal device to the own device via the network 5. Then, it is determined whether or not the index included in the received message is stored in the connection permission list storage unit 101.

  Then, when the index of the terminal device is stored in the connection permission list storage unit 101, the handoff control unit 102 transmits a message corresponding to the handoff request to the own device to the transmission source of the handoff request via the network 5. When the index of the terminal device is not stored in the connection permission list storage unit 101, a message (HO Preparation Failure) rejecting the handoff request to the own device is transmitted to the transmission source of the handoff request via the network 5. In addition, the handoff control unit 102 stores the transmitted message in the communication log storage unit 103.

The communication log storage unit 103 stores a message transmitted by the handoff control unit 102.
Based on the message history stored in the communication log storage unit 103, the non-CSG terminal device proximity determination unit 104 determines whether the non-CSG terminal device 300 that is not permitted to connect to the own device is in proximity to the own device. Determine whether or not. Further, if the non-CSG terminal apparatus proximity determination unit 104 determines that the non-CSG terminal apparatus 300 is close to the own apparatus, the non-CSG terminal apparatus proximity determination unit 104 notifies the macro base station apparatus 200 to which the non-CSG terminal apparatus 300 is connected via the network 5.

  Here, the non-CSG terminal device 300 is close to the own device means that in the non-CSG terminal device 300, the received power of the signal transmitted by the own device is greater than the received power of the signal transmitted by another base station device. This means that the non-CSG terminal device 300 is located at a position (in the communication area 100A) that becomes a larger state. In other words, it means that the non-CSG terminal apparatus 300 is located in the communication area 100A formed by the CSG base station apparatus 100.

The determination as to whether or not the non-CSG terminal device 300 that is not permitted to connect to the own device is in proximity is performed as follows. The non-CSG terminal device proximity determination unit 104 detects the number of messages rejected from the handoff transmitted within the latest predetermined period from the messages stored in the communication log storage unit 103, and the detected number Is determined to be greater than or equal to a predetermined threshold value.
And the non-CSG terminal device proximity determination part 104 determines with the non-CSG terminal device 300 adjoining to an own apparatus, when the detected number is more than a threshold value. On the other hand, when the detected number is less than the threshold value, the non-CSG terminal device proximity determination unit 104 does not have the non-CSG terminal device 300 in proximity to the own device, that is, the non-CSG terminal device 300 has moved from the own device. Determine that you are away.

  The wireless communication unit 105 performs wireless communication with the CSG terminal device 301 located within the communication area of the own device. Moreover, the radio | wireless communication part 105 reduces the interference with respect to the non-CSG terminal device 300, when the non-CSG terminal device proximity determination part 104 determines with the non-CSG terminal device 300 approaching an own apparatus. For example, transmission to the connected CSG terminal device 301 is performed with the minimum transmission power that can maintain communication.

FIG. 3 is a schematic block diagram showing the configuration of the macro base station apparatus 200 in the present embodiment. The macro base station apparatus 200 includes a handoff control unit 202 and a wireless communication unit 205 as shown in FIG.
When the handoff control unit 202 receives the information indicating the deterioration of the radio quality from the non-CSG terminal device 300 and the CSG terminal device 301 connected to the own device via the wireless communication unit 205, Send a handoff request message. This handoff request message is a message including an index of a terminal device whose radio quality that is a target of handoff is degraded and a handoff request of the terminal device, and is transmitted to the base station device in which the terminal device is in proximity. This is a message sent to the user.

  The wireless communication unit 205 performs wireless communication with the non-CSG terminal device 300 and the CSG terminal device 301 located within the communication area of the own device. Further, when the wireless communication unit 205 is notified from the CSG base station device 100 that the non-CSG terminal device 300 connected to the wireless communication unit 205 is close to the CSG base station device 100, the non-CSG terminal Transmission is performed so as to improve the wireless quality of the apparatus 300. For example, in order to improve radio quality, the radio communication unit 205 transmits a signal with a lower coding rate so that an error rate of a received signal is reduced, or widens a frequency bandwidth used for transmission. Or send a signal.

Subsequently, after the non-CSG terminal apparatus 300 connected to the macro base station apparatus 200 approaches the CSG base station apparatus 100 and is positioned in the communication area 100A of the CSG base station apparatus 100, the communication area 100A is moved out. Processing in the CSG base station apparatus 100 and the macro base station apparatus 200 when moving is described.
FIG. 3 is a sequence diagram illustrating an operation example of the wireless communication system 1 of the present embodiment.

When the non-CSG terminal apparatus 300 approaches the CSG base station apparatus 100, the signal transmitted from the connected macro base station apparatus 200 is interfered by the signal transmitted from the CSG base station apparatus 100, and the non-CSG terminal The wireless quality of the device 300 deteriorates (step S10).
The non-CSG terminal apparatus 300 transmits a message indicating that the radio quality has deteriorated to the macro base station apparatus 200 (step S15).

  This message is, for example, TriggerA3 or TriggerA5 of Measurement Report. TriggerA3 is transmitted based on the magnitude relationship between the received power from the connected macro base station apparatus 200 (serving sector) and the received power from the approaching CSG base station apparatus 100 (neighbor sector). In TriggerA5, the received power from the connected macro base station apparatus 200 (serving sector) is less than the threshold, and the received power from the approaching CSG base station apparatus 100 (neighbor sector) is greater than or equal to the threshold. Sent when

When the macro base station apparatus 200 receives a message indicating that the radio quality is deteriorated from the connected non-CSG terminal apparatus 300, the macro base station apparatus 200 receives the message indicating that the non-CSG terminal apparatus 300 is approaching. A message including the index of the non-CSG terminal apparatus 300 and the handoff request of the non-CSG terminal apparatus 300 is transmitted (step S20).
The handoff control unit 102 of the CSG base station apparatus 100 determines that the index included in the message received from the macro base station apparatus 200 is not stored in the connection permission list storage unit 101, and sends a message to reject the handoff to the macro base station. It transmits to the apparatus 200 (step S25).

  When the non-CSG terminal apparatus 300 continues to approach the macro base station apparatus 200, the processes of steps S15, S20, and S25 described above are repeated. That is, the handoff control unit 102 provided in the CSG base station apparatus 100 continues to transmit a message (HO Preparation Failure) rejecting the handoff request. As a result, the number of messages rejecting the handoff stored in the communication log storage unit 103 of the CSG base station apparatus 100 increases.

  Then, in the CSG base station apparatus 100, the number of messages rejecting the handoff stored in the communication log storage unit 103 within the most recent predetermined period exceeds the threshold value, and the non-CSG terminal apparatus 300 is in proximity If it is, the non-CSG terminal device proximity determination unit 104 determines (step S30), and the wireless communication unit 105 reduces interference with the non-CSG terminal device 300.

  Further, the non-CSG terminal apparatus proximity determination unit 104 notifies the macro base station apparatus 200 that the non-CSG terminal apparatus 300 is close (step S35). The radio communication unit 205 provided in the macro base station apparatus 200 receives the notification from the CSG base station apparatus 100 and improves the radio quality for the non-CSG terminal apparatus 300 connected to the own apparatus.

When the non-CSG terminal apparatus 300 leaves the CSG base station apparatus 100 and goes out of the communication area 100A, the radio quality is recovered. Then, the non-CSG terminal apparatus 300 does not transmit a message indicating that the radio quality has deteriorated to the macro base station apparatus 200 (step S40).
The macro base station apparatus 200 does not transmit a handoff request message (HO Preparation Failure) to the CSG base station apparatus 100. As a result, the number of messages rejecting the handoff stored in the communication log storage unit 103 of the CSG base station apparatus 100 in the latest predetermined period decreases.

In the CSG base station apparatus 100, the number of messages in the latest predetermined period among the messages rejecting the handoff stored in the communication log storage unit 103 becomes less than the threshold, and the non-CSG terminal apparatus 300 Are not in proximity, the non-CSG terminal device proximity determination unit 104 determines (step S45).
The non-CSG terminal apparatus proximity determination unit 104 notifies the macro base station apparatus 200 that the non-CSG terminal apparatus 300 is not in proximity (step S50).

(Second Embodiment)
Since the configuration of the CSG base station apparatus in the wireless communication system in the second embodiment is different from that of the wireless communication system 1 in the first embodiment described above, the CSG base station apparatus will be described below, and the description of other configurations will be omitted. To do.
FIG. 5 is a schematic block diagram showing the configuration of the CSG base station apparatus 110 in the present embodiment. The CSG base station apparatus 110 is different from the CSG base station apparatus 100 of the first embodiment in that the CSG base station apparatus 110 includes a connection non-permission list storage unit 106 and a non-CSG terminal apparatus proximity determination unit 107, as shown in FIG. . Further, in the CSG base station apparatus 110, the same components as those of the CSG base station apparatus 100 of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The connection disapproval list storage unit 106 stores an index of the non-CSG terminal device 300.
Similar to the non-CSG terminal apparatus proximity determining unit 104 of the first embodiment, the non-CSG terminal apparatus proximity determining unit 107 permits connection to the own apparatus based on the history of messages stored in the communication log storage unit 103. It is determined whether or not the non-CSG terminal device 300 that is not connected is close to the own device. If the non-CSG terminal device proximity determining unit 107 determines that the device is close to the own device, the non-CSG terminal device proximity determining unit 107 notifies the macro base station device 200 to which the non-CSG terminal device 300 is connected via the network 5.

Further, the non-CSG terminal apparatus proximity determining unit 107 stores the index of the non-CSG terminal apparatus 300 that is located in the communication area of the own apparatus and determined to be close to the connection non-permission list storage unit 106.
Further, every time a message for rejecting handoff is newly stored, the non-CSG terminal proximity determination unit 107 stores the index of the non-CSG terminal device 300 rejected by the message in the connection disapproval list storage unit 106. It is determined whether or not it has been done. Then, the non-CSG terminal apparatus proximity determination unit 107 determines that the non-CSG terminal apparatus 300 is close to the own apparatus when the index of the non-CSG terminal apparatus 300 is stored in the connection disapproval list storage unit 106. . That is, the non-CSG terminal device proximity determining unit 107 generates a list (black list) of non-CSG terminal devices 300 that are not permitted to connect to the own device in the connection non-permitted list storage unit 106, and the handoff control unit 101 Each time a message rejecting handoff is transmitted, it is determined whether or not the non-CSG terminal apparatus 300 is close to the own apparatus based on the list.

  In the wireless communication systems of the first and second embodiments described above, the fact that the non-CSG terminal apparatus 300 connected to the macro base station apparatus 200 is in proximity to the CSG base station apparatus 100 indicates that the CSG base station apparatus 100 The non-CSG terminal apparatus proximity determination unit 104 can detect and notify the macro base station apparatus 200 that the non-CSG terminal apparatus 300 is close to the own apparatus.

  In addition, by detecting that the non-CSG terminal apparatus 300 is close to its own apparatus, the CSG base station apparatus 100 and the macro base station apparatus 200 operate to suppress deterioration of radio quality of the non-CSG terminal apparatus 300. Can do. For example, the non-CSG base station apparatus 100 can perform operations such as reducing the transmission power to the CSG terminal apparatus 301 and narrowing the frequency bandwidth used for transmission. Moreover, the macro base station apparatus 200 can perform operations such as lowering the coding rate of signals transmitted to the non-CSG terminal apparatus 300 and increasing the frequency bandwidth used for transmission.

  In addition, the CSG base station apparatus 100 according to the second embodiment includes the connection non-permission list storage unit 106, so that when the non-CSG terminal apparatus 300 that has approached the own apparatus approaches again, the process of step S35 is performed. It is possible to promptly notify the macro base station apparatus 200 that the non-CSG terminal apparatus 300 is close to the own apparatus.

  In the present embodiment, the case where each of the CSG base station device 100, the macro base station device 200, the non-CSG terminal device 300, and the CSG terminal device 301 is one has been described. It may be the above. At this time, whether or not a plurality of non-CSG terminal apparatuses 300 are close to the CSG base station apparatus 100 is determined for each non-CSG terminal apparatus 300 using a UE index that identifies each non-CSG terminal apparatus 300. . Further, a plurality of CSG base station devices 100 may be arranged in the communication area 200A of one macro base station device 200. Also, there may be a plurality of CSG terminal devices 301 that are permitted to connect to the CSG base station device 100.

  In addition, the non-CSG terminal device proximity determination unit 104 (107) has described a configuration in which it is determined that the non-CSG terminal device 300 is close when the number of messages rejecting handoff exceeds a threshold value. . Here, by setting the threshold value to “1”, it may be determined that the non-CSG terminal apparatus 300 is close when a message rejecting handoff is detected. Thereby, when the non-CSG terminal apparatus proximity determination unit 104 (107) approaches the own apparatus, the non-CSG terminal apparatus proximity determination unit 104 (107) can quickly execute the process of step S35, and the wireless quality of the non-CSG terminal apparatus 300 is improved. The deterioration time can be shortened.

  In addition, the connection non-permission list storage unit 106 stores in advance an index of the non-CSG terminal device 300 that is a target of rejection of connection and handoff, and the non-CSG terminal device regardless of the number of messages that reject the handoff. The proximity determination unit 107 may determine that the non-CSG terminal apparatus 300 is close.

  Moreover, although the CSG base station apparatus 100 demonstrated the structure provided with the connection permission list | wrist memory | storage part 101 in which the UE index of the CSG terminal device 301 in which the connection is permitted was demonstrated, it is not restricted to this, CSG base station A server device that manages a list of indexes of CSG terminal devices 301 that are permitted to connect to the device 100 may be provided. In this case, the handoff control unit 102 provided in the CSG base station apparatus 100 may use the UE index received together with the handoff request to make an inquiry to the server apparatus to determine whether connection is possible.

  The CSG base station apparatus 100 described above may have a computer system inside. In that case, the processes of the above-described connection permission list storage unit, handoff control unit, communication log storage unit, non-CSG terminal device proximity determination unit, and wireless communication unit are stored in a computer-readable recording medium in the form of a program. The above processing is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

DESCRIPTION OF SYMBOLS 1 ... Radio | wireless communications system 5 ... Network 100,110 ... CSG base station apparatus 101 ... Connection permission list memory | storage part 102,202 ... Handoff control part 103 ... Communication log memory | storage part 104,107 ... Non-CSG terminal device proximity determination part 105,205 ... Wireless communication unit 106 ... Connection disapproval list storage unit 200 ... Macro base station apparatus 300 ... Non-CSG terminal apparatus 301 ... CSG terminal apparatus

Subsequently, after the non-CSG terminal apparatus 300 connected to the macro base station apparatus 200 approaches the CSG base station apparatus 100 and is positioned in the communication area 100A of the CSG base station apparatus 100, the communication area 100A is moved out. Processing in the CSG base station apparatus 100 and the macro base station apparatus 200 when moving is described.
FIG. 4 is a sequence diagram illustrating an operation example of the wireless communication system 1 of the present embodiment.

Claims (5)

A first base station apparatus; a first terminal apparatus that is previously permitted to connect to the first base station apparatus; a second terminal apparatus that is not permitted to connect to the first base station apparatus; and the first base station A radio communication system comprising: a second base station apparatus connected to the second terminal apparatus using the same frequency band as a station apparatus used for connection to the first terminal apparatus,
The first base station apparatus
When a handoff request for requesting connection with the second terminal device is received from the second base station device, a handoff control unit that transmits a message rejecting the handoff request to the second base station device;
In the most recent predetermined period, the number of times the handoff control unit has transmitted the message is detected, and when the detected number of transmissions is equal to or greater than a predetermined threshold, the second terminal device A proximity determination unit that determines that the second terminal apparatus is not located in the communication area when the number of transmissions detected is less than the threshold value. A wireless communication system comprising: The first base station device further includes:
A connection non-permission list storage unit for storing an index for identifying the second terminal device;
The proximity determination unit
When it is determined that the second terminal device is located within the communication area of the own device, the index of the second terminal device is stored in the connection disapproval list storage unit,
Each time the handoff control unit transmits a message rejecting the handoff request, it is determined whether the index of the second terminal device for which the handoff is rejected by the message is stored in the connection disapproval list storage unit, The index of the second terminal device is stored in the connection rejection list storage unit, and it is determined that the second terminal device is located in the communication area of the own device. The wireless communication system according to 1. A base station device, a first terminal device that is permitted to connect to the base station device in advance, a second terminal device that is not permitted to connect to the base station device, and the base station device that is connected to the first terminal device A base station apparatus in a wireless communication system comprising a first base station apparatus connected to the second terminal apparatus using the same frequency band used for connection with
When a handoff request for requesting connection with the second terminal device is received from the first base station device, a handoff control unit that transmits a message rejecting the handoff request to the first base station device;
In the most recent predetermined period, the number of times the handoff control unit has transmitted the message is detected, and when the detected number of transmissions is equal to or greater than a predetermined threshold, the second terminal device A proximity determination unit that determines that the second terminal apparatus is not located in the communication area when the number of transmissions detected is less than the threshold value. A base station apparatus comprising: A first base station apparatus; a first terminal apparatus that is previously permitted to connect to the first base station apparatus; a second terminal apparatus that is not permitted to connect to the first base station apparatus; and the first base station A radio communication method in a radio communication system comprising: a second base station apparatus connected to the second terminal apparatus using the same frequency band as a station apparatus used for connection to the first terminal apparatus. ,
When the first base station apparatus receives a handoff request for requesting connection with the second terminal apparatus from the second base station apparatus, the handoff control transmits a message rejecting the handoff request to the second base station apparatus. Steps,
When the first base station apparatus detects the number of times the message has been transmitted in the handoff control step within the most recent predetermined period, and the detected number of transmissions is equal to or greater than a predetermined threshold, When it is determined that the second terminal device is located in the communication area of the own device and the detected number of transmissions is less than the threshold value, the second terminal device is located in the communication area. A proximity determination step for determining that there is no wireless communication method. A first base station apparatus; a first terminal apparatus that is previously permitted to connect to the first base station apparatus; a second terminal apparatus that is not permitted to connect to the first base station apparatus; and the first base station A first base station apparatus in a wireless communication system comprising: a second base station apparatus connected to the second terminal apparatus using the same frequency band as the station apparatus used for connection to the first terminal apparatus. On the computer provided,
When the first base station apparatus receives a handoff request for requesting connection with the second terminal apparatus from the second base station apparatus, the handoff control transmits a message rejecting the handoff request to the second base station apparatus. Steps,
When the first base station apparatus detects the number of times the message has been transmitted in the handoff control step within the most recent predetermined period, and the detected number of transmissions is equal to or greater than a predetermined threshold, When it is determined that the second terminal device is located in the communication area of the own device and the detected number of transmissions is less than the threshold value, the second terminal device is located in the communication area. A program for executing the proximity determination step for determining that there is no.

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