JP2013131788A - Base station and radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station and a radio communication system capable of securing communication by a flow-in terminal or a conventional terminal even if a position cannot be registered to a host device.SOLUTION: The radio communication system comprises communication terminals 12, a base station 11, and a host apparatus 10. The base station 11 comprises a controller 112 and a storage unit 113. The controller 112 sets plural different second base station IDs in place of a first base station ID given by the host apparatus 10, successively reports the second base station IDs to communication terminals 12 existing within the communication area of the base station 11, retains in the storage unit 113 the telephone numbers of the communication terminals 12 having registered positions in response to a position registration request from the communication terminals 12 having received the reported second base station IDs, and controls communication between the communication terminals 12 within the communication area of the base station 11, on the basis of the telephone numbers retained in the storage unit 113.

Description

  The present invention relates to a base station such as a PHS (Personal Handyphone System) and a wireless communication system.

  In a wireless communication system that performs communication by transmitting and receiving wireless signals to and from a communication terminal, location registration is generally performed to register where the communication terminal exists.

  For example, in PHS, a plurality of CSs (Cell Stations: base stations) are arranged in an area called a paging area, and the paging area in which a PS (Personal Station: terminal) is located is registered. In the registration process, when a communication terminal moves between paging areas, communication is performed with a base station belonging to the destination paging area, for example, the base station located closest to the moved communication terminal. Is done.

  Here, when there is an incoming call to a specific communication terminal, when an incoming message is transmitted to that communication terminal, the communication terminal to be communicated is located with reference to the registered location information A paging area is identified.

  Then, incoming messages are transmitted simultaneously from all the base stations belonging to the specified paging area. When the communication terminal to be communicated receives this incoming message, a response to the incoming message is transmitted to the base station (base station located closest to the communication terminal), thereby starting a call.

  Here, the location information is registered in a server or the like in the higher-level device of the base station via the base station, and the information is used to identify the above-described paging area, but a problem occurs in the higher-level device. If a communication failure occurs in the communication line used for communication between the host device and the base station, a communication terminal (inflow terminal) that has moved from another paging area can use the location information for location registration. Even if it is sent to the base station, it will not be registered if it cannot be sent to the higher order device or if it is not processed due to a problem in the higher order device.

  If new location information is not registered, even if a failure is recovered, only the old location information is registered in the host device. Therefore, when a call arrives at the inflow terminal, the paging area is specified based on the old location information. Therefore, the incoming message does not reach the inflowing terminal moving to another paging area.

  In order to solve such a problem, for example, in Patent Document 1, when the location registration cannot be performed in the higher-level device, the base station changes the base station ID set by the higher-level device to a temporary base station ID and notifies the broadcast information. A technique for performing location registration in a base station by transmitting and transmitting a location registration request to a mobile station is disclosed.

  Further, in Patent Document 2, when location registration cannot be performed in a host device, when performing loopback communication at the base station, the mobile station is notified of the identification number of the mobile station that can be communicated with other mobile stations by using broadcast information. A technique that enables individual communication with a station is disclosed.

  Further, in Patent Document 3, when a base station has a storage unit that stores location information of a mobile station and location registration cannot be performed in a host device, communication between mobile stations in which location information is stored in the own station is described. A technique for performing loopback communication at the base station is disclosed.

JP-A-11-55725 Japanese Patent Laid-Open No. 2002-171568 Japanese Patent Laid-Open No. 10-304425

  If a host device malfunctions or a communication failure occurs on the communication line used for communication between the host device and the base station, the inflowing terminal sends location information to the base station for location registration. However, if it cannot be sent to the higher-level device ahead or is not processed due to a problem in the higher-level device, the location is not registered, and the inflow terminal cannot communicate. In addition, communication terminals (conventional terminals) that remain in the paging area also have a problem that communication cannot be performed if a failure of the host device or a communication failure with the host device occurs.

  The present invention has been made to solve the above-described problems, and provides a radio communication system and a base station that can ensure communication of an inflow terminal and a conventional terminal even when location registration cannot be performed in a host device. The purpose is to do.

  In order to solve the above problems, a wireless communication system according to the present invention includes a communication terminal, a base station that performs wireless communication with the communication terminal, and a host device that can perform wired communication with the base station. The base station includes a control unit and a storage unit, and the control unit replaces the first base station ID given by the host device with a plurality of different second Based on the location registration request from the communication terminal that has received the notified second base station ID and sequentially notifies the communication terminals existing in the communication area of the local station. The telephone number of the communication terminal that has performed location registration is stored in the storage unit, and communication between the communication terminals in the communication area of the local station is controlled based on the telephone number stored in the storage unit .

  In one aspect of the wireless communication system according to the present invention, the control unit sets the plurality of different second base station IDs by changing a general call area number.

  In one aspect of the wireless communication system according to the present invention, the control unit sequentially notifies the plurality of different second base station IDs at regular time intervals.

  In one aspect of the wireless communication system according to the present invention, the control unit deletes the telephone number of the communication terminal that has not made a location registration request after informing the second base station ID from the storage unit.

  In one aspect of the wireless communication system according to the present invention, each time the control unit receives a notification of the second base station ID and performs location registration, the communication stored in the storage unit before that By comparing with the telephone number of the terminal, the communication terminal newly flowing into the communication area of the own station and the communication terminal flowing out of the communication area of the own station are grasped.

  In one aspect of the wireless communication system according to the present invention, the control unit sets the plurality of different second base station IDs when the location registration from the communication terminal cannot be performed with respect to the host device, Until the location registration from the communication terminal is restored to the host device, the communication terminal is continuously notified of the plurality of different second base station IDs.

  The base station according to the present invention is a base station that performs wireless communication with a communication terminal and performs wired communication with a host device, and the base station includes a control unit and a storage unit, The control unit sets a plurality of different second base station IDs in place of the first base station ID given by the host device, and sequentially notifies the communication terminals existing in the communication area of the own station. In addition, the storage unit stores the telephone number of the communication terminal that has performed location registration based on the location registration request from the communication terminal that has received the notified second base station ID, and is stored in the storage unit. The communication between the communication terminals in the communication area of the local station is controlled based on the telephone number.

  According to the wireless communication system of the present invention, the location registration is performed in the base station for both the communication terminal that has flowed into the communication area of the local station and the communication terminal that has not moved from within the communication area of the local station. Since the telephone number of the communication terminal that performed the location registration is stored in the storage unit, and communication between the communication terminals in the communication area of the local station is controlled based on the telephone number stored in the storage unit. Even if the terminal cannot register the location with the host device, communication can be secured between the communication terminals in the communication area of the local station.

  According to the base station of the present invention, the location of the communication terminal that has flowed into the communication area of the local station and the communication terminal that has not moved from within the communication area of the local station are registered in the base station. Since the telephone number of the communication terminal that performed the location registration is held in the storage unit and communication between the communication terminals in the communication area of the local station is controlled based on the telephone number held in the storage unit, the communication terminal Even if the location cannot be registered in the host device, communication can be secured between the communication terminals in the communication area of the local station.

It is a block diagram which shows the structure of the radio | wireless communications system which concerns on this invention. It is a block diagram which shows the structure of the base station which concerns on this invention. It is a flowchart explaining the position registration operation | movement in the base station which concerns on this invention. It is a figure explaining the structure of CSID.

<Embodiment>
FIG. 1 is a diagram showing a configuration of a wireless communication system 100 according to the present invention, which performs wireless communication with a communication terminal 12 with a base station 11, and the base station 11 is wired with a host device 10. Communication is performed via the line WL.

  In the wireless communication system 100, the base station 11 performs wireless communication with a plurality of communication terminals 12 by the OFDMA method or the TDMA / TDD method (Time Division Multiple Access / Time Division Duplexing).

  FIG. 2 is a block diagram showing the configuration of the base station 11. As illustrated in FIG. 2, the base station 11 includes a wireless communication unit 111 that performs wireless communication, a wired connection unit 114 that performs communication with the host device 10, a storage unit 113 that stores various types of information, and a wireless communication unit. A communication unit 111, a wired connection unit 114, and a control unit 112 that controls the storage unit 113 are provided.

  The wireless communication unit 111 acquires data from the reception signal received by the array antenna 110 configured by the plurality of antenna elements 110 a and outputs the data to the control unit 112. The wireless communication unit 111 generates a transmission signal including transmission data input from the control unit 112 and wirelessly transmits the transmission signal from the array antenna 110.

  The wired connection unit 114 is connected to the host device 10 by, for example, an optical fiber. The wired connection unit 114 transmits data input from the control unit 112 to the upper level device 10 and outputs data input from the higher level device 10 to the control unit 112.

  The control unit 112 is constituted by, for example, a CPU (Central Processing Unit). When the CPU of the control unit 112 executes the operation program stored in the storage unit 113, the control unit 112 includes a base station ID setting unit 1121, a location registration wait timer control unit 1122, and a base station ID update timer control. Various functional blocks such as the unit 1123 and the telephone number comparison unit 1124 are realized.

  Next, the location registration operation in the base station according to the present invention will be described using the flowchart shown in FIG. 3 with reference to FIG.

  As described above, in the PHS, when a communication terminal moves between paging areas, the communication terminal performs location registration with a higher-level device by performing communication with the base station of the movement destination. However, if a problem occurs in the host device or if a communication failure occurs in the communication line used for communication between the host device and the base station, location information for location registration is sent to the base station. However, it cannot be sent to the next higher-level device or processed by the higher-level device. Hereinafter, such a state is referred to as a line failure.

  When the base station 11 starts a new operation or is restarted by a reset operation or the like, when the power is turned on, each part (the wireless communication unit 111 and the like) is initialized. Next, the base station ID (CSID) of its own station is notified (step S11). The CSID notified at this time is the CSID given by the higher-level device 10, and this base station ID is A.

  Here, the configuration of the CSID will be described with reference to FIG. As shown in FIG. 4, the CSID is composed of 42-bit data and includes a carrier identification code, a general call area number, an additional ID, and a synchronization control code. The carrier identification code is a code for identifying a communication carrier that operates the PHS, and the synchronization control code includes information that defines whether or not the base station is a synchronization partner as viewed from other base stations.

  The paging area number of the CSID is information for knowing to which paging area the communication terminal belongs, and the communication terminal acquires the CSID paging area number transmitted from the base station, so You can find out which general calling area you are currently in.

  The communication terminal stores the general call area number in the internal memory when performing location registration, and moves to the general call area number stored in the internal memory and the CSID sent from the destination base station. If the general call area number is different, new location registration is performed.

  Returning to the description of FIG. 3, the general call area number in the base station ID (= A) reported by the base station 11 in the normal state is an invariant number, and is common to a plurality of base stations in the same paging area. doing.

  The base station 11 periodically sends and receives signals to and from the host device 10 and keeps reporting the normal base station ID (= A) during this period, but the signal is interrupted. In such a case, the base station 11 determines that some line failure has occurred (step S12), and changes the base station ID (step S13).

  When changing the base station ID, it is confirmed whether the current base station ID is a normal base station ID (= A) or an emergency base station ID (= B). If it is ID (= A), the base station ID is changed to the emergency base station ID (= B), and notification of the emergency base station ID (= B) is started (step S15).

  On the other hand, if the current base station ID is already an emergency base station ID (= B), the base station ID is changed to another emergency base station ID (= C) and the emergency base station ID (= C). Is started (step S14).

  Here, the difference between the base station ID at the normal time and the base station ID at the emergency time is the difference in the general call area number, and the base station ID (= A) at the normal time is the general call area number A, the emergency time. Base station ID (= B) can be read as general call area number B, and emergency base station ID (= C) can be read as general call area number C. Note that the base station ID at the normal time is given by the host device 10, but the base station ID at the time of emergency is set by the base station 11, and the base station ID setting unit 1121 ( 2).

  When the notification of the emergency base station ID (= B) or the emergency base station ID (= C) is started, the location registration from the communication terminal 12 in the communication area of the base station 11 is performed, and the base station 11 starts a position registration waiting timer (not shown) and counts the elapsed time (step S16). The location registration waiting timer is controlled by the location registration waiting timer control unit 1122 (FIG. 2) in the control unit 112, and the set time is set to about 5 to 10 minutes.

  As described above, the communication terminal 12 stores the general call area number in the internal memory. By moving, the communication terminal 12 receives the general call area number stored in the internal memory and the destination base station. When the CSID general call area number is different, it has a function of registering a new location.

  Now, the base station 11 starts notifying the emergency base station ID (= B) or the emergency base station ID (= C), so that all the communication terminals 12 in the communication area of the base station 11 The general calling area number stored in the internal memory is different from the general calling area number included in the newly received emergency base station ID (= B) or emergency base station ID (= C). . For this reason, the communication terminal 12 in the communication area of the base station 11 communicates with the base station 11 and transmits a location registration request signal.

  Receiving the location registration request signal, the base station 11 performs location registration processing assuming that there is a location registration request (step S17). In this process, the telephone number of the communication terminal 12 that has transmitted the location registration request signal is stored in the storage unit 113 (FIG. 2) or the like (step S18). Here, the telephone number comparison unit 1124 in the control unit 112 stores the telephone number of the communication terminal 12 in the storage unit 113 and compares it with the telephone number already stored in the storage unit 113 to obtain a new telephone number. If the number is registered, it is determined that a new communication terminal 12 has flowed into the communication area (own cell) of the base station 11, and the telephone numbers that are not re-registered flow out of the own cell. Judge that it was done. Thereby, the inflow and outflow of the communication terminal 12 can be grasped.

  Whether there is no location registration request or there is a location registration request, the location registration waiting timer expires, and the acceptance of location registration is terminated (step S19). If the position registration wait timer has not expired, the operations in step S17 and subsequent steps are repeated.

  After the acceptance of the location registration is completed, the phone number information in the storage unit 113 is updated by deleting all the phone numbers registered before the start of the operation of the location registration waiting timer (step S20).

  Next, a base station ID update timer (not shown) for updating the base station ID is started and the passage of time is counted (step S21). This operation is performed once every time the location registration waiting timer expires. That is, in the present invention, the base station ID is changed a plurality of times until the line failure is restored, but the change interval is set by the base station ID update timer after the expiration of the position registration wait timer. The base station ID is changed after a predetermined period has elapsed. The base station ID update timer is controlled by the base station ID update timer control unit 1123 in the control unit 112, and the set time may be set to be approximately the same as the set time of the location registration waiting timer, for example. For example, it may be set to several hours.

  If it is determined in step S22 that the base station ID update timer has expired, the process returns to the determination operation in step S13 to check whether the current base station ID is a normal base station ID (= A) or an emergency base station. Check if the station ID (= B), and if it is an emergency base station ID (= B), change to another emergency base station ID (= C), and the emergency base station ID (= C) notification is started (step S14).

  On the other hand, if it is determined in step S22 that the base station ID update timer has not expired, it is confirmed in step S23 whether or not the line failure has been recovered.

  As described above, the base station 11 periodically sends and receives signals to and from the higher-level device 10, and determines that some line failure has occurred when the sending and receiving of signals is interrupted. However, if the signal sent from the base station 11 is accepted and a response is received from the host device 10, it is determined that the line failure has been recovered.

  If it is determined in step S23 that the line failure has been recovered, if the location registration waiting timer is operating, the location registration waiting timer is stopped (step S24), and the base station ID update timer is activated. If so, the base station ID update timer is stopped (step S25). And it returns to step S11 and returns CSID to base station ID (= A) which the base station 11 alert | reports in a normal state.

  By returning the CSID to the base station ID (= A) at the normal time, location registration is induced from the communication terminal 12 in the own station cell. In this case, the location registration is performed in the host device 10.

  On the other hand, if it is determined in step S23 that the line failure has not yet been recovered, the operations in step S17 and subsequent steps are repeated.

  As described above, in the base station 11, when a line failure occurs with the host device 10, the simultaneous call area number of the base station ID to be notified is changed. Thereby, location registration is induced from the communication terminal 12 in the own station cell of the base station 11, the location registration processing is performed in the base station 11, and the telephone number of the communication terminal that has performed the location registration is stored in the storage unit 113 in the own station. Hold on.

  Accordingly, when a line failure occurs between the base station 11 and the higher-level device 10, even if there is a communication terminal 12 that has flowed into the local station cell, the communication terminal 12 is not connected to the base station 11. The location is registered at.

  Since the base station 11 holds the telephone number of the communication terminal 12 in its own cell in the storage unit 113, communication can be established by loopback communication between the communication terminals in its own cell. The problem that the inflow terminal cannot communicate does not occur.

  In addition, for a communication terminal (conventional terminal) 12 that has not moved from its own cell, location registration is triggered by changing the general call area number of the base station ID. Since the data is held in the storage unit 113 in the own station, communication can be performed by loopback communication between communication terminals in the own station cell.

  In addition, while a line failure occurred between the base station 11 and the higher-level device 10, the base station ID was changed into the paging area number many times and flowed into the own station cell. The presence of the communication terminal 12 can be grasped, and the communication terminal 12 that has flowed out from the own station cell can also be grasped. For this reason, it is not necessary to perform incoming processing for the communication terminal 12 that has flowed out of the local station cell, and efficient processing is possible.

  Further, since the telephone number of the communication terminal 12 for which location registration was not performed when the base station ID was changed is deleted from the storage unit 113, the storage capacity of the storage unit 113 can be used effectively.

  The flowchart shown in FIG. 3 shows an example in which an emergency base station ID (= B) and an emergency base station ID (= C) are prepared with respect to a normal base station ID (= A). However, this is an example, and it is needless to say that more emergency base station IDs may be used.

  Moreover, although the example which performs base station ID change periodically using a base station ID update timer was shown, change of base station ID does not need to be periodic, and base station ID is changed at an at random timing. It may be configured to output.

10 Host device 11 Base station 12 Communication terminal

Claims (7)

A communication terminal;
A base station that performs wireless communication with the communication terminal;
A wireless communication system comprising a host device capable of performing wired communication with the base station,
The base station
A control unit and a storage unit;
The controller is
In place of the first base station ID given by the higher-level device, a plurality of different second base station IDs are set and sequentially notified to the communication terminals existing in the communication area of the own station and also notified. The telephone number of the communication terminal that has performed location registration based on the location registration request from the communication terminal that has received the second base station ID is stored in the storage unit, and the telephone number stored in the storage unit Based on this, the communication between the communication terminals in the communication area of the local station is controlled. The controller is
The wireless communication system according to claim 1, wherein the plurality of different second base station IDs are set by changing a general call area number. The controller is
The wireless communication system according to claim 1, wherein the plurality of different second base station IDs are sequentially reported at regular time intervals. The controller is
2. The wireless communication system according to claim 1, wherein a telephone number of a communication terminal that has not made a location registration request after notification of the second base station ID is deleted from the storage unit. The controller is
Each time the location registration is performed in response to the notification of the second base station ID, the communication with the local station is performed by comparing with the telephone number of the communication terminal stored in the storage unit before that. The radio | wireless communications system of Claim 1 which grasps | ascertains the communication terminal which newly flowed in in the area, and the communication terminal which flowed out of the communication area of the said local station. The controller is
When location registration from the communication terminal is not possible for the higher-level device, the plurality of different second base station IDs are set,
2. The wireless communication system according to claim 1, wherein the plurality of different second base station IDs are continuously notified to the communication terminal in sequence until the location registration from the communication terminal is restored to the upper device. A base station that performs wireless communication with a communication terminal and performs wired communication with a host device,
The base station
A control unit and a storage unit;
The controller is
In place of the first base station ID given by the higher-level device, a plurality of different second base station IDs are set and sequentially notified to the communication terminals existing in the communication area of the own station and also notified. The telephone number of the communication terminal that has performed location registration based on the location registration request from the communication terminal that has received the second base station ID is stored in the storage unit, and the telephone number stored in the storage unit Based on this, the base station controls communication between the communication terminals in the communication area of the local station.

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