JP2012175663A - Mobile station and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To favorably detect a failure of the transmitting function of a mobile station and control the message transmission.SOLUTION: A mobile station 1 includes: a transmission section 20 that transmits a transmitting message to a base station; reception monitoring sections 10 and 31 that monitor a receiving message transmitted from the base station; a failure determining section 32 that determines a failure of the transmission section 20 in accordance with a monitoring result of the receiving message; and a transmission controlling section 33 that controls frequency of transmission of the transmitting message by the transmission section 20. The failure determining section 32 determines that a transmitting message transmitted by the transmission section 20 has failed in a predetermined sequence (i) when a receiving message corresponding to the predetermined sequence is not received in respond to the transmitted message, and that there is a failure in the transmission section 20 (ii) when a series of failures occur in the predetermined sequence for the base station. If it is determined that there is a failure in the transmission section 20, the transmission controlling section 33 reduces the frequency of transmission of the transmitting message by the transmission section 20 to be lower than a predetermined frequency.

Description

  The present invention relates to a technical field of abnormality detection in a device such as a mobile station that performs wireless communication.

  In a mobile communication system in which this type of mobile station is used, the mobile station appropriately performs a plurality of types of transmission / reception sequences such as location registration and call control with a connected base station.

  Since mobile stations such as mobile phones basically communicate with the base station using the same frequency during a call, in an environment where there are multiple mobile stations, each transmission radio wave interferes and the communication quality is low. May deteriorate. For this reason, the transmission power of the mobile station used in various transmission sequences is uniformly controlled according to the distance from the base station and the like so as not to interfere with the transmission radio waves of other mobile stations.

  For example, a conventional mobile station disclosed in the prior art documents described below provides a control of transmission power by providing a feedback loop that detects the power of a transmission radio wave and monitors it on the control circuit in the radio wave transmission circuit. It is carried out.

  When transmission power control does not function normally, such as when an abnormality occurs in the transmission circuit of the mobile station, the mobile station cannot complete the call control sequence with the base station. If the call processing sequence cannot be completed, the mobile station then attempts to perform a location registration sequence that is a basic sequence with the base station. However, if the transmission power cannot be controlled properly, the location registration sequence cannot be completed normally, and the mobile station repeatedly re-executes the location registration sequence.

JP 2005-236572 A

  If the transmission function of the mobile station fails and the transmission power cannot be controlled, the mobile station frequently outputs a radio wave with excessive transmission power or repeatedly executes the location registration sequence as described above. May try to communicate with. In any case, there is a possibility that such communication of the mobile station interferes with the transmission radio waves of other mobile stations in the vicinity and interferes with the communication. For this reason, it is preferable that the mobile station restricts communication with the host device when the transmission power cannot be controlled.

  When the radio wave reception function from the base station is operating normally under the situation where the control of the transmission power of the mobile station is not functioning, the mobile station can grasp the status of the host device from the broadcast information. For this reason, the mobile station repeatedly attempts a location registration sequence or the like with respect to the base station, and transmits radio waves with excessive transmission power or frequently communicates as described above.

  In addition, when a problem occurs in the transmission power control function during a call, the mobile station may set the transmission power to a lower limit or an upper limit within a setting range. Since the transmission quality cannot be secured with such transmission power, the base station disconnects the line. The mobile station disconnected from the base station repeatedly executes a new call control sequence or location registration for the base station, which may interfere with communication of surrounding mobile stations and cause unnecessary traffic in the base station. .

  In view of the technical problems described above, the present invention detects an abnormal state of a transmission power control function of a mobile station and interferes with communication of other mobile stations by transmitting radio waves with excessive transmission power. An object of the present invention is to provide a mobile station capable of suppressing an increase in unnecessary traffic in a base station.

  In order to solve the above-described problem, the disclosed mobile station is a mobile station that performs communication with a base station, and includes a function unit including a transmission unit, a reception monitoring unit, an abnormality determination unit, and a transmission control unit. Have The transmission unit transmits a transmission message to the base station at a predetermined frequency. The reception monitoring unit monitors a reception message transmitted from the base station. The abnormality determination unit determines whether an abnormality has occurred in the transmission unit according to the monitoring result of the received message. The transmission control unit controls the frequency with which the transmission unit transmits a transmission message. In addition, the abnormality determination unit (i) determines that the predetermined sequence has failed when a received message that conforms to the predetermined sequence is not received for the transmission message transmitted by the transmission unit, and (ii) If the predetermined sequence fails continuously, it is determined that an abnormality has occurred in the transmission unit. When it is determined that an abnormality has occurred in the transmission unit, the transmission control unit reduces the frequency at which the transmission unit transmits the transmission message from a predetermined frequency.

  According to the configuration described above, it is possible to suitably detect that an abnormality has occurred in the transmission function of the mobile station. Further, when an abnormality occurs in the transmission function, it is possible to suitably suppress interference with communication of surrounding mobile stations and an increase in unnecessary traffic of the base station caused by repeatedly executing an abnormal transmission sequence. It becomes possible.

It is a block diagram which shows the structure of position embodiment of a mobile station. It is a flowchart which shows the flow of the determination process of the normality of the transmission function of a mobile station. It is a sequence diagram which shows an example of the process in a position registration sequence. 4 is an example of a monitoring information table recorded in a defect database 41. It is a flowchart which shows the flow of the update process of the table of monitoring information. It is a flowchart which shows the flow of the determination process of the normality of the transmission function of a mobile station. It is an example of the record stored in the monitoring information table. It is an example of the record stored in the monitoring information table. It is an example of the record stored in the monitoring information table. It is an example of the record stored in the monitoring information table. It is a flowchart which shows the flow of the determination process of the normality of the transmission function of a mobile station.

  Embodiments for carrying out the invention will be described below.

(1) Configuration Example A configuration example of the disclosed mobile station will be described with reference to FIG. FIG. 1 is a block diagram illustrating hardware included in a mobile station 1 which is a configuration example of the disclosed mobile station and functional units that conveniently represent functions included in the hardware.

  As shown in FIG. 1, the mobile station 1 includes a reception unit 10, a transmission unit 20, a CPU (Central Processing Unit) 30, and a memory 40. Note that FIG. 1 is described focusing on the parts related to the configuration or operation of the disclosed mobile station, among the hardware and functional units of the mobile station 1, and the configuration or operation of the disclosed mobile station. The description of relatively unrelated hardware is omitted. In addition to the configuration described below, the mobile station 1 may have the same hardware as a known mobile station.

  The receiving unit 10 is a concept including an antenna provided in the mobile station 1 and a DSP (Digital Signal Processor) that performs received signal processing. The receiving unit 10 receives radio waves from a base station with which the mobile station 1 communicates, and The received data included is acquired and input to the CPU 30.

  The transmission unit 20 is a concept that includes an antenna provided in the mobile station 1 and a DSP that performs transmission signal processing and transmission sequence processing. The transmission unit 20 transmits a radio wave to a base station with which the mobile station 1 communicates, thereby Send data to the station.

  The receiving unit 10 and the transmitting unit 20 execute a predetermined transmission sequence such as location registration and call processing with the base station under the control of the CPU 30. In the transmission sequence, the transmission unit 20 of the mobile station 1 transmits a predetermined message to the base station, and the reception unit 10 receives a message for making some request from the base station or a response to the transmitted message.

  The CPU 30 includes a reception monitoring unit 31, an abnormality determination unit 32, and a transmission control unit 33. In these, functions realized by the operation of the CPU 30 are described as functional units for convenience. Each functional unit may be realized by, for example, some program executed by the CPU 30, or may be realized by some hardware that operates under the control of the CPU 30.

  The reception monitoring unit 31 monitors the data content from the base station received by the receiving unit 10 and determines whether the data is appropriate in the transmission sequence. Specifically, the reception monitoring unit 31 monitors the content of a response message transmitted from the base station in response to a message transmitted from the transmission unit 20 to the base station in a predetermined transmission sequence, and the message is transmitted. It is determined whether or not it is appropriate along the sequence. When the received message is not an appropriate response along the transmission sequence, the reception monitoring unit 31 stores information related to the sequence in the defect database 41 in the memory 40.

  The reception monitoring unit 31 counts the elapsed time after the transmission unit 20 sends a message to the base station in a predetermined transmission sequence. The reception monitoring unit 31 stores information related to the sequence in the defect database 41 when a response message is not received within a specified timeout period defined in the sequence.

  The memory 40 is a recording device that stores various data and programs related to the operation of the mobile station 1, user data, and the like. The memory 40 stores a defect database 41. A format of data stored in the defect database 41 and a specific mode of data storage will be described in detail later.

  The abnormality determination unit 32 refers to data stored in the defect database 41 and determines whether or not the function of the transmission unit 20 of the mobile station 1 is abnormal. The abnormality determination unit 32 notifies the transmission control unit 33 of the determination result.

  The transmission control unit 33 controls data transmission processing according to the transmission sequence in the transmission unit 20. When the function of the transmission unit 20 is normal, the transmission control unit 33 controls the operation of the transmission unit 20 to execute a position registration transmission sequence with a predetermined frequency with respect to the base station. On the other hand, when it is determined that the function of the transmission unit 20 is abnormal, the transmission control unit 33 reduces the frequency of executing the location registration transmission sequence for the base station as compared with the normal time. The operation of the transmission unit 20 is controlled. In addition, when it is determined that the function of the transmission unit 20 is abnormal, the transmission control unit 33 may control the operation of the transmission unit 20 so that transmission is not performed.

(2) Operation Example With reference to FIG. 2, the flow of the normality determination process of the function of the transmission unit 20 of the mobile station 1 by the abnormality determination unit 32 will be described. FIG. 2 is a flowchart showing the flow of the normality determination process of the function of the transmission unit 20 by the abnormality determination unit 32. In FIG. 2, various processes related to the position registration sequence that are performed relatively frequently in the transmission sequence performed by the transmission unit 20 will be described.

  As shown in FIG. 2, the transmission unit 20 of the mobile station 1 executes a location registration sequence with respect to the base station at a predetermined timing under the control of the transmission control unit 33 of the CPU 30 (step S101). The location registration sequence is determined by the CPU 30 when the mobile station 1 moves from a connected base station to a cell under the control of another base station, or when the mobile station 1 is activated in the cell. Is done. At this time, the transmission control unit 33 of the CPU 30 determines the start of the position registration sequence in consideration of the state of a “position registration suppression flag” described later.

  During the location registration sequence, the reception monitoring unit 31 monitors whether or not the location registration sequence has been normally completed by monitoring received messages in the location registration sequence.

  Here, the case where the position registration sequence is normally completed indicates that a predetermined message has been exchanged according to a predetermined sequence. On the other hand, when it is not completed normally, that is, when an abnormality occurs, it indicates that the communication protocol has not been completed according to a predetermined sequence in a state where the mobile station 1 can communicate with the base station. . For example, when waiting for the next message from the base station, the message reception monitoring timer has timed out because the response message has not been received during the predetermined waiting period, or the received message is not appropriate according to the protocol. Is applicable.

  FIG. 3 shows a mode of message transmission / reception among the mobile station 1, base station, and RNC (Radio Network Controller), which is a higher-level device, in an example of a location registration sequence.

  As illustrated in FIG. 3, the transmission unit 20 starts a location registration sequence by transmitting a “RRC CONNECTION SETUP REQUEST” message to the RNC via the base station. The RNC performs radio link setting by exchanging inter-station control signals such as NBAP (Node B Application Part) and QAAL2 (ATM Adaptation Layer type 2) with the base station.

  After the radio link is set up, the RNC transmits a “RRC CONNECTION SETUP” message to the mobile station 1 as a response to the “RRC CONNECTION SETUP REQUEST” message.

  At this time, the reception monitoring unit 31 of the mobile station 1 monitors whether or not a response to the “RRC CONNECTION SETUP REQUEST” message has been received, or whether or not the received message is appropriate according to the response content. Thus, it is determined whether or not the position registration sequence has been completed normally. The reception monitoring unit 31 makes the same determination for other received messages in the location registration sequence shown in FIG. 3 and finally determines whether or not the location registration sequence has been completed normally. The reception monitoring unit 31 stores, in the memory 40, monitoring information as to whether or not the position registration has been normally completed as a position registration end code.

  After the end of the location registration sequence, the reception monitoring unit 31 determines whether or not the mobile station 1 is under access restriction such as call restriction, and updates the defect database 41 according to the determination result (step S103). .

  When the mobile station 1 is under access restriction (step S103: Yes), the abnormal end of the location registration sequence may not be caused by an abnormality in the transmission function of the mobile station 1, but may be due to restriction. For this reason, there is a possibility that the normality of the transmission function based on the position registration sequence cannot be properly determined. In addition, since the transmission / reception function of the mobile station 1 may become unstable during access restriction, the reception monitoring unit 31 displays a table of monitoring information in the defect database 41 at the timing when it is determined that access restriction is in progress. All are erased (step S104).

  When the mobile station 1 is not under access restriction (step S103: No), the reception monitoring unit 31 performs a process of updating the monitoring information table recorded in the defect database 41 (step S105).

  With reference to FIGS. 4 and 5, the monitoring information table update processing will be described. FIG. 4 is an example of a monitoring information table recorded in the defect database 41. The monitoring information table has a plurality of defect databases 41 corresponding to the base stations that communicated in the location registration sequence. FIG. 5 is a flowchart showing the flow of the update process of the monitoring information table.

  As shown in FIG. 4, the monitoring information table includes a record number, a base station number identifying the base station with which the mobile station 1 communicated in the location registration process, a location registration end code, a determination time at the end of location registration, and movement A record including the received signal level from the base station received by the station 1 is stored. The reception monitoring unit 31 may acquire the received signal level from the base station by monitoring the antenna picture indicating the intensity of the received radio wave from the base station, the level of the received radio wave from the base station, and the like. . The received signal level at this time may be stored in the form of a measured radio wave intensity or the like, or may be stored as a determination result such as good or bad by comparison with a preset threshold value.

  The monitoring information table is set so as to store a record relating to each single base station, and a predetermined number is provided in the defect database 41. In each monitoring information table, the number of records that can be stored (for example, X in the example of FIG. 4) is set in advance. This upper limit record number X is preferably prepared in a sufficient number for determining the normality of the transmission function of the mobile station 1 from the position registration end code in the normality determination process described later.

  The location registration sequence is appropriately performed in a situation where it is preferable that location information managed on the higher-level device side such as the RNC is updated, such as when the mobile station 1 moves to another base station area. At this time, if the location registration sequence is normally completed, the next location registration sequence is not performed until the location information needs to be updated. On the other hand, when the position registration sequence is not normally completed, the mobile station 1 repeatedly executes the position registration sequence until the position registration sequence is normally completed. For this reason, when the location registration sequence is not normally completed, the records in the monitoring information table are updated with a relatively high frequency using records based on the monitoring information acquired in the repeatedly executed location registration sequence. In consideration of this, it is preferable to determine the upper limit of the number of records in each monitoring information table. For example, the upper limit of the number of records is preferably about 20 to 50.

  As described above, each monitoring information table is set to store monitoring information related to a single base station. Therefore, the defect database 41 stores a plurality of (for example, m, m is an integer of 2 or more) monitoring information tables in order to store monitoring information for a plurality of base stations. When the position registration sequence performed with a certain base station is not normally completed, there may be a case where an abnormality occurs in the transmission function of the mobile station 1, and the mobile station 1 itself is normal. It is possible that there is an abnormality on the side. For this reason, the accuracy of normality determination is improved by storing the monitoring information when the position registration sequence is performed for each of the plurality of base stations, and determining the normality of the mobile station 1 based on the respective monitoring information. To do. Since the increase in the number of base stations to be monitored is in a trade-off relationship with the extension of the period required for determination, a suitable number of monitoring base stations (in other words, the number of monitoring information tables) is set according to the situation. It is preferable. For example, about m = 3 is realistic and preferable.

  With reference to FIG. 5, the flow of the monitoring information table update process will be described. First, the reception monitoring unit 31 collects information to be stored in the monitoring information table from the monitoring information of the location registration sequence (step S201).

  The reception monitoring unit 31 refers to the defect database 41 and confirms whether the base station number (in other words, the base station with which the mobile station 1 communicated in the location registration sequence) related to the stored information is already stored in the table. (Step S202). As described above, since the monitoring information table shown in FIG. 4 is provided for each base station, the reception monitoring unit 31 corresponds to the base station number related to the information stored in the defect database 41 in this processing. It may be confirmed whether or not a monitoring information table exists.

  When the base station number related to the information to be stored is already registered in the monitoring information table (step S202: Yes), the reception monitoring unit 31 checks whether or not there is an empty record in the table corresponding to the base station number. (Step S203). As described above, an upper limit is set for the number of records in each table. The reception monitoring unit 31 may check whether or not there is an empty record by comparing the number of stored records with the upper limit.

  If there is a vacant record in the table (step S203: Yes), the reception monitoring unit 31 stores the information collected in step S201 in the vacant record of the table and increments the record number of the previously stored record. (Step S204). On the other hand, when there is no empty record in the table (step S203: No), the reception monitoring unit 31 stores the information collected in step S201 by overwriting the record with the oldest measurement time in the table (step S205). ).

  When the base station number related to the information to be stored is not registered in the monitoring information table (step S202: No), the reception monitoring unit 31 updates the update time (in other words, the monitoring information table in the defect database 41). The table with the oldest record) is cleared, and the base station number related to the collected information is assigned to the table (step S206). Thereafter, the reception monitoring unit 31 stores the collected information in the first record of the table (step S207).

  Returning to the flowchart of FIG. 2, the description of the normality determination process will be continued. After the table update process (step S105) ends, the abnormality determination unit 32 refers to the updated table information and determines the normality of the transmission function of the mobile station 1 (step S106).

  With reference to FIGS. 6 and 7, the flow of normality determination processing of the transmission function will be described. FIG. 6 is a flowchart showing the flow of normality determination processing of the transmission function of the mobile station 1. FIG. 7 is an example of a record stored in the monitoring information table.

  In determining the normality of the transmission function, the abnormality determination unit 32 assigns numbers 1 to m for convenience for the m monitoring information tables stored in the defect database 41. The abnormality determination unit 32 sets a variable n = 0 (step S301), and sequentially increments n to refer to the monitoring information tables 1 to m individually.

  The abnormality determination unit 32 increments n (step S302), sets n = 1, and checks the position registration end code of the record stored in the first monitoring information table (step S303). Specifically, the abnormality determination unit 32 refers to the position registration end code of the record stored in the nth monitoring information table, and indicates that “at least one of the position registration sequences has been normally completed” Is determined to be “normal” or “abnormal” (step S304).

  If one or more location registration end codes are “normal” in the records stored in the nth monitoring information table (step S304: Yes), the abnormality determination unit 32 determines that the nth Is determined to be “normal” (step S305).

  7 and 8 show an example of the monitoring information table when it is determined as “normal”. In FIG. 7, in the location registration sequence with the base station set to the base station number 12, the location registration end code is “abnormal” continuously from the measurement time 11: 07: 07.100 to 11: 07: 08.400. Is stored. On the other hand, at the measurement time 11: 07: 08.500, a record whose location registration end code is “normal” is stored. In this way, even if a record whose location registration end code is continuously “abnormal” is stored, if a record “normal” is stored after that, the location registration sequence is properly performed for some reason. It can be determined that the function of the mobile station 1 that could not be completed is normalized. Therefore, when one or more records whose location registration end code is “normal” are stored in the monitoring information table, the abnormality determination unit 32 determines the transmission function of the mobile station 1 determined from the monitoring information table. Judged to be “normal”.

  In the example of FIG. 7, for each record, the reception level from the base station at the time of the location registration sequence is good (in other words, the measured reception level is equal to or higher than a predetermined threshold that can be determined to be good). Explains the case. On the other hand, as shown in FIG. 8, even when the reception level from the base station at the time of the location registration sequence is poor, the abnormality determination unit 32 indicates that the location registration end code is “normal” in the monitoring information table. When one or more records are stored, it is determined that the transmission function of the mobile station 1 determined from the monitoring information table is “normal”. The bad reception level indicates a case where the reception level from the base station measured by the mobile station 1 is less than a predetermined threshold that can be determined to be good, for example, the antenna pict is not maximum. In this way, even if the reception level from the base station is not good, it can be determined that there is no abnormality in the transmission function itself of the mobile station 1 because the position registration sequence has been completed normally. is there.

  On the other hand, if the record stored in the nth monitoring information table does not include any record whose location registration end code is “normal” (step S304: No), then the abnormality determination unit 32 Refers to the reception level of the record included in the table (step S306). The abnormality determination unit 32 determines whether the transmission function of the mobile station 1 determined from the monitoring information table is “normal” or “abnormal” according to the reception level of each record.

  FIG. 9 shows an example of the monitoring information table when it is determined as “abnormal”. In FIG. 9, in the location registration sequence with the base station set to the base station number 12, the location registration end code is “abnormal” continuously from the measurement time 11: 07: 07.100 to 11: 07: 08.500. Is stored. In the example shown in FIG. 9, the reception level is “good” for each record (step S306: No). In this way, when the reception level is good, it can be determined that the location registration sequence is not completed normally continuously due to some abnormality of the mobile station 1 or the base station that is not caused by the reception level. At this time, the abnormality determining unit 32 determines that the “n” monitoring information table is “abnormal” (step S308).

  On the other hand, when the reception level of the record stored in the table is “bad” (step S306: Yes), the abnormality determination unit 32 determines that the table is “normal” (step S307). FIG. 10 shows an example of the monitoring information table when the position registration end codes of the stored records are all “abnormal” and the reception levels are all “bad”. In FIG. 10, in the location registration sequence with the base station set to the base station number 12, the location registration end code is “abnormal” continuously from the measurement time 11: 07: 07.100 to 11: 07: 08.500. Is stored. Further, the reception level is “bad” for each record. In such a case, since the reception status from the base station is not good, it can be determined that the location registration sequence cannot be normally completed due to this. Therefore, the abnormality determination unit 32 tentatively determines that the nth monitoring information table is “normal” (step S307).

  After determining “normal” or “abnormal” for the n-th monitoring information table, the abnormality determination unit 32 uses the determination result for the monitoring information table including the record of the latest measurement time as the latest determination result. Store in the memory 40 (step S309). For example, when n = 1, the abnormality determination unit 32 uses the determination result of the first monitoring information table and the measurement time of the latest record stored in the first monitoring information table as the latest determination result. Is stored in the memory 40. At the time of processing after n> 1, the abnormality determination unit 32 measures the latest record related to the latest determination result stored in the memory 40 with the measurement time of the latest record stored in the nth monitoring information table. Compared with the time, the determination result relating to the table including the newer record is stored as the latest determination result. In addition, the abnormality determination part 32 may store the determination result about the monitoring information table including the record with the latest measurement time as the latest determination result by some other means.

  Subsequently, the abnormality determination unit 32 compares the variable n with the monitoring information table number m (step S310). When n = m is not satisfied (that is, when n <m), the abnormality determination unit 32 increments the value of n (step S302), and performs the processing from step S303 to step S309 until n = m (in other words, paraphrase). (For example, until all the monitoring information tables are determined).

  When n = m (step S310: Yes), the abnormality determination unit 32 refers to the determination result for all m monitoring information tables (step S311). Of the determination results for the m monitoring information tables, if the determination result is “normal” for one or more tables (step S312: Yes), then the abnormality determination unit 32 refers to the latest determination result ( Step S313).

  Of the determination results for the m monitoring information tables, the determination result for one or more tables is “normal” (step S312: Yes), and the latest determination result is “normal” (step S313: Yes) The abnormality determination unit 32 determines that the transmission function of the mobile station 1 is “normal” (step S314). The transmission control unit 33 that has received the “normal” determination notification from the abnormality determination unit 32 cancels the flag when the “location registration suppression flag” has been set in the previous process, and determines the frequency of execution of the location registration sequence. The state is set to a normal state (in other words, a state that does not depend on the control according to the present embodiment).

  Of the determination results for the m monitoring information tables, the determination result for one or more tables is “normal” (step S312: Yes), and the latest determination result is “abnormal” (step S313: No) The abnormality determination unit 32 determines that the mobile station 1 may have an abnormality in the transmission function, and determines that it is “caution” (step S316). The transmission control unit 33 that has received the notification of “careful” determination from the abnormality determination unit 32 sets the “location registration suppression flag” and suppresses the execution frequency of the location registration sequence (step S317).

  In addition, when the determination results for all the tables among the determination results for the m monitoring information tables are “abnormal” (step S312: No), the abnormality determination unit 32 indicates that the mobile station 1 has an abnormality in the transmission function. Is determined to be “abnormal” (step S318). The transmission control unit 33 that has received the notification of “abnormal” determination from the abnormality determination unit 32 cancels the flag when the “location registration suppression flag” has been set in the previous process (step S319). This is to avoid the influence of the “location registration suppression flag” when the transmission is re-executed because the transmission function itself is stopped in the subsequent processing.

  In FIG. 2 again, the transmission control unit 33 refers to the determination result for the transmission function after making any of the above-described determinations for the transmission function of the mobile station 1 (step S107 in FIG. 2). When it is determined that an abnormality has occurred in the transmission function (FIG. 2, step S107: No), the transmission control unit 33 stops the transmission function of the transmission unit 20 (FIG. 2, step S108). After the normality determination process, the transmission control unit 33 ends the position registration sequence.

  The “location registration suppression flag” described above is one setting (in other words, a flag) on the software execution set in the transmission control unit 33. When the “location registration suppression flag” is set, the transmission control unit 33 reduces the execution frequency of the location registration sequence to the base station performed by the transmission unit 20 compared to the normal state described above.

  When an abnormality occurs in the transmission function of the mobile station 1 and, for example, transmission power control or the like cannot be performed properly, the position registration sequence is not normally completed. When the location registration sequence is not normally completed, the transmission control unit 33 of the mobile station 1 executes the location registration sequence again with respect to the base station. For this reason, when an abnormality occurs in the transmission function of the mobile station 1 and the position registration sequence cannot be completed normally, the mobile station 1 repeatedly executes the position registration sequence at a predetermined frequency.

  In this operation example, the abnormality determination unit 32 has one or more base stations whose position registration end code is determined to be “normal” in the position registration sequence with a plurality of base stations. When the position registration sequence with the station is normally completed, it is determined that the transmission function of the mobile station 1 is “normal”. In such a case, it can be determined that the location registration sequence has not been completed normally due to a problem on the base station side. Therefore, the abnormality determination unit 32 determines that there is no abnormality in the transmission function of the mobile station 1, and cancels the flag if the “location registration suppression flag” has already been set.

  In addition, the abnormality determination unit 32 includes one or more base stations whose position registration end code is determined to be “normal” in the position registration sequence with a plurality of base stations. If the location registration sequence between them is not completed normally, it is determined that the transmission function of the mobile station 1 is “caution”. In such a case, it can be determined that the location registration sequence has not been completed normally due to a malfunction of either the base station or the mobile station 1. However, it cannot be determined whether or not the function of the mobile station 1 is normal. Therefore, the abnormality determination unit 32 determines “Caution required”, which means that an abnormality may have occurred, and suppresses the execution frequency of the position registration sequence in the communication control unit 33 “location registration suppression”. Set the flag.

  The case where the location registration sequence with the base station is not normally completed in the latest determination is basically that the location registration sequence with the base station with which the mobile station 1 is currently communicating is normal. Indicates a situation that does not complete. Therefore, the communication control unit 33 determines that the location registration sequence is unlikely to succeed in the base station area, while the location registration sequence in other base station areas is determined based on the information stored in the defect database 41. It may be determined that there is a possibility of completing normally. At this time, in addition to the successful location registration within the base station area, the communication control unit 33 triggers the mobile station 1 to complete the location registration sequence normally after moving to another base station area. The “location registration suppression flag” may be canceled.

  The abnormality determination unit 32 determines that an abnormality has occurred in the transmission function of the mobile station 1 when it is determined that the position registration end code is “abnormal” in all of the position registration sequences with a plurality of base stations. To do. In addition, the communication control unit 33 sets a “location registration suppression flag” that suppresses the execution frequency of the location registration sequence.

  For example, if the location registration sequence with a plurality of base stations is not normally completed, and the location registration sequence with another base station is normally completed, the location registration sequence is not normally completed. This is because, in addition to the abnormality of the mobile station 1, an abnormality on the base station side can be considered. On the other hand, if a record indicating that the position registration sequence with the corresponding base station is not normally completed in all of the m monitoring information tables stored in the defect database 41, the base The possibility of an abnormality on the station side is low, and there is a high possibility that an abnormality has occurred in the transmission function of the mobile station 1. The number of monitoring information tables stored in the defect database 41, in other words, the number of base stations serving as a criterion for determining the normality of the mobile station 1, is that the location registration sequence is not normally completed in consideration of such reasons. Is preferably set so as to be distinguishable between whether the error is caused by an abnormality on the base station side or an abnormality of the mobile station 1.

  When it is determined that an abnormality has occurred in the transmission function of the mobile station 1, even if the mobile station 1 moves to another base station area, the location registration sequence is normally completed with the base station. I don't think it will happen. For this reason, when it is determined that an abnormality has occurred in the transmission function of the mobile station 1, the transmission control unit 33 immediately stops the transmission of radio waves via the transmission unit 20. Preferably, when the abnormality determination unit 32 determines that an abnormality has occurred in the transmission function of the mobile station 1, the abnormality determination unit 32 notifies the user via the monitor of the mobile station 1 or a speaker (none of which is shown). To notify the abnormality of the transmission function and the stop of the transmission function.

  In the operation example described above, when the transmission control unit 33 determines that an abnormality has occurred in the transmission function of the mobile station 1 (FIG. 6, step S318), the transmission function is stopped, for example, the subsequent location registration sequence The operation of the transmission unit 20 is controlled so as not to execute (FIG. 2, step S108). At this time, instead of stopping the transmission function, the transmission control unit 33 may perform a process of reducing the frequency of execution of the position registration sequence by setting a position registration suppression flag. At this time, it is preferable that the execution frequency of the location registration sequence after the change is determined in consideration of the amount of traffic between the base stations and the influence of interference on surrounding mobile stations. In addition, when communication that is determined to be normal is performed, for example, the position registration sequence is normally completed after reducing the frequency of execution of the position registration sequence, the abnormality determination unit 32 indicates that the transmission function of the mobile station 1 is normal. It may be determined that there is, and the execution frequency of the position registration sequence may be returned to the state before the reduction.

  In the operation example described above, the abnormality determination unit 32 refers to the monitoring information table stored in the defect database 41 and performs normality determination based on the monitoring information of the position registration sequences for a plurality of base stations. If the location registration sequence is not normally completed by referring to the location registration sequence monitoring information for a plurality of base stations, the mobile station 1 side problem or the base station side problem that was communicating in the location registration sequence Can be suitably determined. This is useful for detecting an abnormality in the transmission function of the mobile station 1 and improving detection accuracy.

  On the other hand, the abnormality determination unit 32 may determine the normality of the transmission function of the mobile station 1 based on the monitoring information of the position registration sequence with a single base station. Specifically, the abnormality determination unit 32 sets m = 1 in the normality determination flowchart shown in FIG. 6, and the monitoring information table for the base station with which the mobile station 1 is communicating during the normality determination process Normality is determined based on. Even in such processing, it is possible to preferably detect an abnormality in the transmission function of the mobile station 1.

  In the operation example described above, the example in which the normality of the function of the transmission unit 20 is determined using the position registration sequence of the mobile station 1 as an example of the transmission sequence has been described. However, the abnormality determination unit 32 may determine the normality of the function of the transmission unit 20 by performing the same processing for other transmission sequences. Here, the transmission sequence indicates transmission / reception of a series of data according to a predetermined format between the mobile station 1 and the base station or a host device on the network. Preferably, the transmission sequence is data transmission / reception between the mobile station 1 and an opposite apparatus communicating with the mobile station, and when a transmission message from the mobile station 1 is properly received, that fact This indicates that the response of the message notifying the user is performed. The other transmission sequence may be a known sequence such as a transmission sequence, an incoming sequence, a call termination sequence, a sector addition sequence, and the like. Moreover, the abnormality determination part 32 may perform the normality determination of the function of the transmission part 20 combining suitably the monitoring information whether such several different types of transmission sequences were completed normally.

  Each of the reception monitoring unit 31, the abnormality determination unit 32, and the transmission control unit 33 that are functional units included in the CPU 30 may be a function realized by some program executed by the CPU 30. In this case, the mobile station 1 can realize each of the above-described processes by using software including a program without adding new hardware to the configuration of the mobile station used conventionally. For this reason, the mobile station 1 does not need to provide dedicated hardware such as a feedback loop for monitoring the transmission radio wave output to the base station, and has the advantages of improving versatility and suppressing manufacturing costs.

(3) Second Operation Example In addition to the above-described operation example, the abnormality determination unit 32 performs the transmission function of the mobile station 1 by the normality determination process of the mobile station 1 according to the second operation example as described below, for example. It may be determined whether or not an abnormality has occurred. FIG. 11 is a flowchart showing the flow of normality determination processing according to the second operation example. With reference to FIG. 11, the flow of normality determination processing according to the second operation example will be described.

  In determining the normality of the transmission function, the abnormality determination unit 32 assigns numbers 1 to m for convenience for the m monitoring information tables stored in the defect database 41. The abnormality determination unit 32 sets a variable n = 0 (step S401), and sequentially increments n to refer to the monitoring information tables 1 to m individually.

  The abnormality determination unit 32 increments n (step S402), sets n = 1, and checks the position registration end code of the record stored in the first monitoring information table (step S403). Specifically, the abnormality determination unit 32 refers to the position registration end code of the record stored in the nth monitoring information table, and indicates that “at least one of the position registration sequences has been normally completed” "N" is determined whether it is "normal" or "abnormal" (step S404).

  When one or more location registration end codes are “normal” in the records stored in the nth monitoring information table (step S304: Yes), the abnormality determination unit 32 determines that the mobile station 1 Is determined to be “normal” (step S405). At this time, if the “location registration suppression flag” has been set in the previous process, the transmission control unit 33 cancels the flag and sets the execution frequency of the location registration sequence to a normal state (step S406).

  On the other hand, when all the records stored in the nth monitoring information table have the location registration end code “abnormal” (step S406: No), the abnormality determination unit 32 sets the variable n and the number m of the monitoring information tables. Compare (step S407). When n = m is not satisfied (that is, when n <m), the abnormality determining unit 32 increments the value of n (step S402), and performs the processing from step S403 to step S404 until n = m (in other words, paraphrase). (For example, until all the monitoring information tables are determined).

  Of the determination results for the m monitoring information tables, when the determination results for all the tables are “abnormal” (step S404: No, and step S407: Yes), the abnormality determination unit 32 determines that the mobile station 1 It is determined that an abnormality has occurred in the transmission function, and it is determined to be “abnormal” (step S408). The transmission control unit 33 that has received the notification of “abnormal” determination from the abnormality determination unit 32 cancels the flag when the “location registration suppression flag” has been set in the previous process (step S409). This is to avoid the influence of the “location registration suppression flag” when the transmission is re-executed because the transmission function itself is stopped in the subsequent processing.

  The transmission control unit 33 refers to the determination result regarding the transmission function after performing any of the above-described determinations on the transmission function of the mobile station 1 (step S107 in FIG. 2). When it is determined that an abnormality has occurred in the transmission function (FIG. 2, step S107: No), the transmission control unit 33 stops the transmission function of the transmission unit 20 (FIG. 2, step S108). After the normality determination process, the transmission control unit 33 ends the position registration sequence.

  According to the normality determination process according to the second operation example described above, it is possible to determine whether or not an abnormality has occurred in the transmission function of the mobile station 1 by a simpler process.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the gist or concept of the invention that can be read from the claims and the entire specification. The control method is also included in the technical scope of the present invention.

As mentioned above, the following additional remarks are further described about embodiment described in this specification.
(Appendix 1)
A mobile station that performs wireless communication with a base station,
A transmitter that transmits a transmission message to the base station at a predetermined frequency;
A reception monitoring unit for monitoring a received message transmitted from the base station;
An abnormality determination unit that determines whether an abnormality has occurred in the transmission unit according to a monitoring result of the received message;
A transmission control unit that controls the frequency at which the transmission unit transmits the transmission message, and
The abnormality determining unit (i) determines that the predetermined sequence has failed when a received message along a predetermined sequence is not received for the transmission message transmitted by the transmitting unit, and (ii) If the predetermined sequence for the base station fails continuously, it is determined that an abnormality has occurred in the transmitter,
When it is determined that an abnormality has occurred in the transmission unit, the transmission control unit reduces the frequency at which the transmission unit transmits the transmission message from the predetermined frequency.
(Appendix 2)
The mobile station according to supplementary note 1, wherein the abnormality determination unit determines that an abnormality has occurred in the transmission unit when the predetermined sequence for the same base station continuously fails.
(Appendix 3)
The mobile station according to appendix 1, wherein the abnormality determination unit determines that an abnormality has occurred in the transmission unit when the predetermined sequence for all of the plurality of base stations fails continuously. .
(Appendix 4)
When it is determined that an abnormality has occurred in the transmission unit, the transmission control unit reduces the frequency at which the transmission unit transmits the transmission message so that the transmission unit does not transmit the transmission message. The mobile station according to any one of supplementary notes 1 to 3.
(Appendix 5)
A reception level measurement unit for measuring a reception level of the reception message transmitted from the base station;
The abnormality determination unit causes the transmission unit to be abnormal when the predetermined sequence for the base station continuously fails and the reception level of the reception message transmitted from the base station is equal to or less than a predetermined threshold. The mobile station according to any one of appendices 1 to 4, wherein the mobile station is determined as having occurred.
(Appendix 6)
If the abnormality determination unit succeeds in the predetermined sequence for the base station, the abnormality determination unit determines that no abnormality has occurred in the transmission unit,
If the transmission control unit determines that no abnormality has occurred in the transmission unit, the transmission control unit sets the frequency at which the transmission unit transmits the transmission message as the predetermined frequency. A mobile station according to any one of the above.
(Appendix 7)
A communication control method in a mobile station that performs radio communication with a base station,
A transmission step of transmitting a transmission message at a predetermined frequency to the base station;
A reception monitoring step of monitoring a received message transmitted from the base station;
An abnormality determination step for determining whether an abnormality has occurred in the transmission function of the mobile station according to the monitoring result of the received message;
A transmission control step of controlling the frequency of transmitting the transmission message in the transmission step,
In the abnormality determination step, (i) when a received message that conforms to a predetermined sequence is not received for the transmission message transmitted in the transmission step, it is determined that the predetermined sequence has failed; If the predetermined sequence for the base station fails continuously, it is determined that an abnormality has occurred in the transmission function,
In the transmission control step, when an abnormality occurs in the transmission function, the frequency of transmitting the transmission message in the transmission step is reduced from the predetermined frequency.

1 mobile station,
10 Receiver,
20 Transmitter,
30 CPU,
31 reception monitoring unit,
32 Abnormality determination unit,
33 transmission control unit,
40 memory.

Claims (7)

A mobile station that performs wireless communication with a base station,
A transmitter that transmits a transmission message to the base station at a predetermined frequency;
A reception monitoring unit for monitoring a received message transmitted from the base station;
An abnormality determination unit that determines whether an abnormality has occurred in the transmission unit according to a monitoring result of the received message;
A transmission control unit that controls the frequency at which the transmission unit transmits the transmission message, and
The abnormality determining unit (i) determines that the predetermined sequence has failed when a received message along a predetermined sequence is not received for the transmission message transmitted by the transmitting unit, and (ii) If the predetermined sequence for the base station fails continuously, it is determined that an abnormality has occurred in the transmitter,
When it is determined that an abnormality has occurred in the transmission unit, the transmission control unit reduces the frequency at which the transmission unit transmits the transmission message from the predetermined frequency.   The mobile station according to claim 1, wherein the abnormality determination unit determines that an abnormality has occurred in the transmission unit when the predetermined sequence for the same base station fails continuously.   The movement according to claim 1, wherein the abnormality determination unit determines that an abnormality has occurred in the transmission unit when the predetermined sequence for all of the plurality of base stations fails continuously. Bureau.   When it is determined that an abnormality has occurred in the transmission unit, the transmission control unit reduces the frequency at which the transmission unit transmits the transmission message so that the transmission unit does not transmit the transmission message. The mobile station according to any one of claims 1 to 3. A reception level measurement unit for measuring a reception level of the reception message transmitted from the base station;
The abnormality determination unit causes the transmission unit to be abnormal when the predetermined sequence for the base station continuously fails and the reception level of the reception message transmitted from the base station is equal to or less than a predetermined threshold. 5. The mobile station according to claim 1, wherein the mobile station is determined to have occurred. If the abnormality determination unit succeeds in the predetermined sequence for the base station, the abnormality determination unit determines that no abnormality has occurred in the transmission unit,
6. The transmission control unit according to claim 1, wherein, when it is determined that no abnormality has occurred in the transmission unit, the frequency at which the transmission unit transmits the transmission message is the predetermined frequency. The mobile station as described in any one. A communication control method in a mobile station that performs radio communication with a base station,
A transmission step of transmitting a transmission message at a predetermined frequency to the base station;
A reception monitoring step of monitoring a received message transmitted from the base station;
An abnormality determination step for determining whether an abnormality has occurred in the transmission function of the mobile station according to the monitoring result of the received message;
A transmission control step of controlling the frequency of transmitting the transmission message in the transmission step,
In the abnormality determination step, (i) when a received message that conforms to a predetermined sequence is not received for the transmission message transmitted in the transmission step, it is determined that the predetermined sequence has failed; If the predetermined sequence for the base station fails continuously, it is determined that an abnormality has occurred in the transmission function,
In the transmission control step, when an abnormality occurs in the transmission function, the frequency of transmitting the transmission message in the transmission step is reduced from the predetermined frequency.

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