JP5691685B2 - Mobile communication relief method, mobile communication monitoring system, base station, and terminal device - Google Patents

Description

  The present invention relates to a mobile communication rescue method, a mobile communication monitoring system, which relieves communication of a terminal under the base station by another base station when the base station is in a function stop (system down) state, The present invention relates to a base station and a terminal device.

  When a base station is in a system down state due to a disaster or a failure and the function as the base station is stopped, the terminals under the base station cannot communicate via the base station. For this reason, various technologies have been proposed so that communication can be continuously performed via another base station even if communication via the base station is interrupted.

  For example, a technique is known in which a terminal device always grasps a communication status with a plurality of base stations, selects a base station with a good communication status, and communicates via the base station. In addition, the base station itself detects the degradation of its own function, notifies the subordinate terminal to that effect, and continues communication via neighboring base stations via the ad hoc network by the plurality of terminals that have received the notification. There is known a technique that can be performed (see, for example, Patent Document 1).

  In addition, the location of mobile terminals and the operating status of base stations are displayed by superimposing information on fire fighting / disaster prevention radio networks and information on mobile communication carriers, and rescuers use commercial portable radios and sensor networks. Thus, a technique for obtaining information on a mobile terminal position (stricken area) is known (see, for example, Patent Document 2).

International Publication No. 2008/035424 JP 2010-157881 A

  With the technology in which each terminal understands the communication status with multiple base stations and communicates via a base station with better communication status, communication is possible due to a wide range of disasters and the occurrence of communication equipment failures. A terminal in an area where there is no base station nearby cannot communicate. In such a case, the user of the terminal can communicate by moving into a cell of a base station capable of communication. However, movement may be difficult when the disaster area is very large, such as in the case of a major disaster.

  When other live base stations located in the vicinity of the faulty base station whose function has been stopped due to a disaster or the like are trying to relieve communication of a terminal under the faulty base station, other live base stations are controlling Alternatively, when the number of communicating terminals reaches a manageable upper limit, it is not possible to relieve communication of terminals that are incapable of communication under the faulty base station.

  The present invention relates to a faulty base station in the vicinity of a faulty base station, even if the number of terminals under control or communication under its control has reached a manageable upper limit. It is possible to relieve the communication of the terminal under control.

The mobile communication remedy method as one form for solving the above-described problem is that when one or a plurality of base stations out of the plurality of base stations used for mobile communication are in a fault state, the mobile communication rescue method is in the fault state. A step of detecting and identifying a base station (hereinafter referred to as a failed base station) with a monitoring system, and a base station adjacent to the failed base station that is not in a failed state (hereinafter referred to as a surviving base station); Transmitting a terminal detection signal to an area under the control of the station, and returning a response signal from the incommunicable terminal under the faulty base station to the terminal detection signal to the monitoring system; in the monitoring system, the response signal based on, to calculate the number of the lost communication terminal, an instruction that enables communication with a terminal of a predetermined number based on the calculated the number, and transmitting to the survival base station, wherein When the surviving base station receives an instruction to enable communication with the predetermined number of terminals, the output level of the transmitted radio wave is once lowered and a part of the terminals under the surviving base station is moved to another base station. And a step of causing .

The monitoring system is a monitoring system that collects fault information and transmits instruction information to a plurality of base stations used for mobile communication, and is a base station in a fault state (hereinafter referred to as fault base). A terminal for detecting a terminal in an area under the faulty base station with respect to a base station (hereinafter referred to as a surviving base station) adjacent to the faulty base station and not in a faulty state. Transmitting a signal, transmitting an instruction to return a response signal to the terminal detection signal from a terminal under the faulty base station, and calculating the number of incommunicable terminals based on the returned response signal In the survival base station, the rescue processing means for transmitting an instruction to enable communication between the terminal detection means and the predetermined number of terminals based on the calculated number of terminals to the living base station. Terminal Upon receiving an instruction that enables communication, with reducing the output level of the transmission radio wave once, in which and a moving means for moving a portion of the terminal under the survival base station to another base station .

Further, the base station is a base station used for mobile communication, and information on a failed base station detected by detecting a communication abnormality with an adjacent failed base station (hereinafter referred to as a failed base station), or The failure base station information transmitting means for notifying the monitoring system of information on the failed base station detected by the terminal under the failed base station and notified from the terminal, and the failure according to the instruction notified from the monitoring system A communication-disabled terminal that transmits a terminal detection signal to an area under the base station, receives a response signal from the communication-disabled terminal under the failed base station in response to the terminal detection signal, and returns the response signal to the monitoring system In accordance with an instruction to enable communication with a predetermined number of terminals from the detection processing means and the monitoring system that has calculated the number of incommunicable terminals based on the response signal, the calculated number of terminals are collected. A relief processing means for, when receiving an instruction for enabling communication with a terminal of the predetermined number, the temporarily reducing the output level of the transmission radio wave, moving the portion of the terminal under the own station to other base station Moving means .

Further, the terminal device is a terminal device used for mobile communication, and is located under a base station in a fault state (hereinafter referred to as a faulty base station) and cannot use a mobile communication service. When a terminal detection signal transmitted from a base station that is not in a fault state (hereinafter referred to as a surviving base station) adjacent to the faulty base station is received, a response signal is sent to the terminal detection signal. A response transmission means for returning to the base station; a handover execution means for performing a handover to the live base station when receiving broadcast information transmitted from the live base station; and a service area under the live base station In this case, there is provided a moving means for performing a handover to another base station when the output level of the transmission radio wave from the surviving base station is lowered .

  In the surviving base station located near the faulty base station, even if the number of terminals under control or communication under its control has reached an upper limit that can be managed, the surviving base station makes a faulty base station nearby. It becomes possible to relieve the communication of the terminal under control.

It is a figure which shows the operation example which detects and specifies a failure base station with a monitoring system. It is a figure which shows the operation example which detects the communication impossible terminal under a failure base station with a monitoring system. It is a figure which shows the operation example which relieves communication of the portable terminal which cannot communicate. It is a figure which shows the operation example when a base station recovers from a failure state. It is a figure which shows the example of arrangement | positioning of a failure base station and a survival base station. It is a figure which shows the example of arrangement | positioning of the base station which relieves communication of the portable terminal of the area under a failure base station. It is a figure which shows the structural example of a mobile communication network. It is a figure which shows the structural example of a monitoring system. It is a figure which shows the structural example of a base station. It is a figure which shows the structural example of a portable terminal. It is a figure which shows the example of an operation | movement sequence which detects the failure of a base station. It is a figure which shows the example of an operation | movement sequence which detects the communication impossibility portable terminal under a failure base station. It is a figure which shows the example of an operation | movement sequence which rescues the portable terminal under a faulty base station. It is a figure which shows the example of an operation | movement sequence after recovery of a failure base station. It is a figure which shows the example of an operation | movement flow of the portable terminal which detects abnormality of a base station. It is a figure which shows the example of an operation | movement flow of the other base station which detects the failure of a base station. It is a figure which shows the example of an operation | movement flow of judgment of the base station failure in a monitoring system. It is a figure which shows the example of an operation | movement flow of judgment of the base station failure in a monitoring system. It is a figure which shows the example of an operation | movement flow of the monitoring system which detects the portable terminal under a failure base station. It is a figure which shows the example of an operation | movement flow of the base station which detects the portable terminal under a failure base station. It is a figure which shows the example of an operation | movement flow of a portable terminal in the detection of the portable terminal under a failure base station. It is a figure which shows the example of an operation | movement flow of the monitoring system which relieves the portable terminal which cannot use communication service. It is a figure which shows the example of an operation | movement flow of the base station which rescues the portable terminal which cannot use a communication service. It is a figure which shows the example of an operation | movement flow of the base station which rescues the portable terminal which cannot use a communication service. It is a figure which shows the operation flow example (at the time of forced handover implementation) of the other portable terminal at the time of relief of the portable terminal which cannot use communication service. It is a figure which shows the operation flow example (after forced handover implementation) of the other portable terminal at the time of relief of the portable terminal which cannot use communication service. It is a figure which shows the example of an operation | movement flow of the said portable terminal at the time of relief of the portable terminal which cannot use communication service. It is a figure which shows the example of an operation | movement flow of the monitoring system at the time of failure base station restoration. It is a figure which shows the example of an operation | movement flow of the base station at the time of failure base station restoration. It is a figure which shows the example of an operation | movement flow of the rescued portable terminal at the time of failure base station restoration. It is a figure which shows the example of an operation | movement flow of the portable terminal which carried out relief assistance at the time of failure base station restoration. It is a figure which shows the example of the accumulation | storage information of the database held in the monitoring system. It is a figure which shows the example of the accumulation | storage information of the database which a base station holds. It is a figure which shows the example of the accumulation | storage information of the database held in a portable terminal.

  If one or more base stations are down (down) due to a disaster such as an eruption or earthquake, or failure of a wide range of communication facilities, communication services cannot be provided to the terminals in the subordinate communication area. It becomes a state. 1 to 3 show a mobile communication monitoring system that detects and identifies a base station that has stopped functioning (hereinafter also referred to as a faulty base station) and detects terminals that cannot communicate with the base station. 1 shows an outline of an operation example for relieving communication of the terminal. FIG. 4 shows an outline of an operation example when the function of the failed base station is restored.

  Hereinafter, embodiments of the disclosed mobile communication rescue method, monitoring system, base station, and terminal device will be described with reference to the drawings. In addition, the following description is description of one Embodiment, This invention is not limited to this embodiment.

  In the following figure, 120a is a base station (failed base station) that has become incapable of functioning and becomes unavailable, and 120b is adjacent to the failed base station 120a and can be used for communication services. A base station that is operating normally (hereinafter also referred to as a surviving base station).

  Reference numeral 130a denotes a mobile terminal that cannot receive a communication service due to a communication failure of the failed base station 120a. 130b is a mobile terminal that can communicate with the surviving base station 120b and can continuously receive communication services.

  In addition, 100 transmits instruction information to the base station 120 via a radio network control device (not shown), and further to the mobile terminal 130 via the base station 120. 120 is a monitoring system that collects failure information from the mobile terminal 130 via the base station 120 or 120.

  With reference to FIG. 1, an operation example in which the monitoring system 100 detects and identifies the faulty base station 120a will be described. When the base station 120a is in a function stop state (unusable state), another available surviving base station 120b adjacent to the base station 120a detects a disconnection with the failed base station 120a (1- 1) Notifying the monitoring system 100 that communication with the failed base station 120a is impossible (1-2).

  In addition, the mobile terminal 130b receiving the communication service under the faulty base station 120a detects the disconnection with the faulty base station 120a (1-3), and adjoins the disconnection with the faulty base station 120a. Notify the surviving base station 120b. The surviving base station 120b notifies the monitoring system 100 of the communication disconnection of the faulty base station 120a (1-4).

  Moreover, the monitoring system 100 acquires disaster information from the disaster information database 160 of an external system such as the Japan Meteorological Agency (1-5). The monitoring system 100 determines whether or not the faulty base station 120a exists based on the plurality of pieces of information, and identifies the faulty base station 120a. The monitoring system 100 also grasps the positional relationship (distance, etc.) between the failed base station 120a and the surviving base station 120b.

  Next, an operation example in which the monitoring system 100 detects an incommunicable terminal 130a under the faulty base station 120a will be described with reference to FIG. After identifying the faulty base station 120a, the monitoring system 100 sends a terminal detection signal to the neighboring surviving base station 120b by broadcast in order to detect the mobile terminal 130a that cannot communicate with the base station 120a. Instruct (2-1).

  The surviving base station 120b broadcasts a terminal detection signal according to the instruction (2-2). The mobile terminals 130a and 130b are provided with a function of transmitting a response signal to the terminal detection signal when there is no available base station when the terminal detection signal is received.

  When receiving the terminal detection signal, the portable terminal 130a having no available base station returns a response signal (2-3). However, the mobile terminal 130b in which an available base station exists does not transmit a response signal even when receiving the terminal detection signal.

  When the survival base station 120b receives the response signal from the mobile terminal 130a, the surviving base station 120b notifies the monitoring system 100 of the number of mobile terminals (response count) that transmitted the response signal (2-4). The monitoring system 100 grasps the number of mobile terminals 130a that cannot communicate under the faulty base station 120a based on the notification.

  Next, with reference to FIG. 3, an operation example for relieving communication of the mobile terminal 130a that cannot communicate will be described. The monitoring system 100, which has grasped the number of mobile terminals 130a that are unable to communicate under the faulty base station 120a, instructs the surviving base station 120b in the vicinity for communication relief. The communication rescue instruction information includes an instruction to decrease or enhance the output level of the transmission radio wave at the surviving base station 120b, or to increase the threshold value of the maximum number of managed mobile terminals.

  First, the monitoring system 100 transmits an instruction to lower the output level of the transmission radio wave to the surviving base station 120b (3-1). In accordance with the instruction, the surviving base station 120b temporarily lowers the output level of the transmission radio wave, and moves the portable terminal 120b managed in the own base station 120b to a subordinate of the other adjacent base station 120c (handover). The number of managed mobile terminals 130b in the own base station 120b is reduced.

  Here, the base station 120c is a base station that is not adjacent to the faulty base station 120a, is a base station that functions normally, and can be used for communication services. In addition, the mobile terminal 130b that has moved (handed over) under the base station 120c is instructed to hold control information that restricts handover so that the second hand over to the base station 120b is not performed again.

  Thereafter, the monitoring system 100 instructs the surviving base station 120b to increase the output level of the transmission radio wave and increase the threshold value of the maximum number of managed terminals (3-3). By doing so, the communicable area of the mobile terminal 130a under the faulty base station 120a is expanded. As a result, the mobile terminal 130a can receive a control signal from the surviving base station 120b, and transits to a normal communication state via the surviving base station 120b (3-4).

  Next, an operation example when the base station 120a recovers from the failure state will be described with reference to FIG. When the mobile terminal 130a rescued by the base station 120b detects the restoration of communication with the base station 120a (4-1), the mobile terminal 130a notifies the monitoring system 100 via the base station 120b (4-2). .

  Upon receiving notification that the base station 120a is restored, the monitoring system 100 releases control information that restricts handover to the base station 120b to the mobile terminal 130b that has been moved (handed over) to the neighboring base station 120c. The instruction is notified via the base station 120c (4-3). Upon receiving the instruction, the portable terminal 130b cancels the handover restriction control information, makes the mobile terminal 130b movable (handover) under the base station 120b, and then transitions to a normal communication state (4-4).

  A configuration example and an operation flow example of the monitoring system, the base station, and the mobile terminal that perform the above-described mobile communication rescue will be described in detail below. FIG. 5 shows an arrangement example of a faulty base station and a surviving base station. As shown in FIG. 5, when a plurality of base stations 120 a are disabled due to a disaster such as an eruption or earthquake or a failure of communication facilities over a wide area, the base station 120 a communicates with a subordinate mobile terminal 130 a. The service cannot be provided.

  The base station 120b is a surviving base station adjacent to the failed base station 120a and is in a state where it can be used for communication services. The base station 120c is a base station that is not adjacent to the failed base station 120a, is functioning normally, and can be used for communication services.

  The mobile terminal 130a cannot receive a communication service due to a communication failure of the failed base station 120a. The mobile terminal 130b can communicate with other normal surviving base stations 120b and is in a state where it can continuously receive communication services. The mobile terminal 130c is located under the base station 120c, but is in a state where it can receive communication services from the peripheral base station 120b.

  FIG. 6 shows an arrangement example of base stations that relieve communication of the mobile terminal 130a in the area under the faulty base station 120a. As shown in FIG. 6, the surviving base station 120b adjacent to the failed base station 120a rescues the mobile terminal 130a subordinate to the failed base station 120a. The portable terminal 130a receives a communication service through the survival base station 120b.

  FIG. 7 shows a configuration example of a mobile communication network. In FIG. 7, the monitoring system 100 is connected to a core network 150 and a disaster information database (DB) 160 of an external system such as the Japan Meteorological Agency. The disaster information database 160 is connected to the monitoring system 100 and the core network 150.

  The mobile communication network includes a base station (BTS) 120 and a radio network controller (BSC) 110, and the base station 120 terminates a radio zone communication path with the mobile terminal 130. The radio network controller 110 that controls each base station 120 accommodates a plurality of base stations 120 and is connected to the core network 150 through the exchange 140. The exchange 140 manages each wireless network control device 110.

  FIG. 8 shows a configuration example of the monitoring system 100. The monitoring system 100 includes a failure information monitoring unit 230, a base station failure (radio 0 base station failure) information receiving unit 240, a base station restoration information receiving unit 250, a terminal detection signal processing unit 260, and a relief processing unit 270. And a peripheral base station database 280 that stores information on the peripheral base stations, and a repair information database 290 that stores the repair information of the mobile terminal.

  The failure information monitoring unit 230 includes a disaster information acquisition unit 201, an information collection unit 202, a failure area identification unit 203, a failure-disaster area comparison unit 204, and a relief determination unit 205. The disaster information acquisition unit 201 has a function of communicating with the disaster information database 160 via a network. The information collection unit 202 has a function of communicating with the base station location information database 170 via a network. The relief determination unit 205 has a function of communicating with the base station map information database 180 via a network.

  The base station failure (radio 0 base station failure) information receiving unit 240 has a function of performing communication with the wireless network control device 110 via a network. The base station restoration information reception 250 includes a handover terminal search unit 206 and a control information release terminal information reception unit 207. The handover terminal search unit 206 and the control information release terminal information reception unit 207 have a function of communicating with the radio network control device 110 and the home location register (HLR) 190 via the network. The home location register (HLR) 190 is a database that manages user information.

  The terminal detection signal processing unit 260 includes a terminal detection signal processing control unit 208, a response terminal number calculation processing unit 209, a terminal detection signal transmission unit 210, and a response signal reception unit 211. The terminal detection signal transmission unit 210 and the response signal reception unit 211 have a function of communicating with the wireless network control device 110 via a network.

  The relief processing unit 270 includes a relief processing control unit 212, a processing instruction unit 213, an output increase / decrease instruction unit 214, a control information release transmission unit 215, a management terminal number change instruction unit 216, an instruction transmission unit 217, a handover A rescue terminal number receiving unit 218 is provided. The instruction transmission unit 217 and the handover / relief terminal number reception unit 218 have a function of performing communication with the radio network control apparatus 110 via a network.

  The monitoring system 100 collates each acquired information such as information acquired from the disaster information database 160 such as the Japan Meteorological Agency, information notified from the mobile terminal 130a, or information notified from the adjacent living base station 120b. As a result of the comparison, the base station 120a determines whether or not the subordinate mobile terminal 130a is in a function stop state that cannot be continuously used for communication services. When it is determined that the base station 120a is in a function stop state, the mobile station 130a is instructed to rescue the mobile terminal 130a via the adjacent living base station 120b.

  FIG. 9 shows a configuration example of the base station 120. The base station 120 includes a neighboring base station monitoring unit 320, a monitoring system transmission unit 330, an instruction reception unit 340, an information reception unit 350, a portable terminal transmission unit 360, a rescue required number comparison processing unit 380, A terminal detection signal monitoring unit 390, a radio wave output increase / decrease processing unit 400, a management terminal number change processing unit 410, a handover terminal search unit 420, a neighboring base station database 430 that stores neighboring base station information, and relief information And a relief information database 370 to be stored.

  The neighboring base station monitoring unit 320 has a function of communicating with neighboring base stations via a network. The transmission unit 330 for the monitoring system includes a non-communication peripheral base station (radio wave 0 base station failure) information transmission unit 301, a failed base station recovery information transmission unit 302, a control release notification transmission unit 303, and a necessary repair number transmission unit 304. And a terminal detection response signal transmission unit 305.

  The instruction receiving unit 340 includes a terminal detection signal receiving unit 306, a radio wave output increase / decrease processing instruction receiving unit 307, a management terminal number change instruction receiving unit 308, and a control information release instruction receiving unit 309. The information receiving unit 350 includes a radio wave zero base station failure information receiving unit 310, a failed base station recovery notification receiving unit 311, a control release notification receiving unit 312, a portable location registration receiving unit 313, and a terminal detection response signal receiving unit. 314. The mobile terminal transmission unit 360 includes a terminal detection signal transmission unit 315 and a control information release instruction transmission unit 316.

  The base station 120 receives the instruction information from the monitoring system 100, transmits a terminal detection signal to the mobile terminal 130 according to the instruction information, and conversely receives the response signal from the mobile terminal 130, A function of notifying the monitoring system 100; Further, the base station 120 has a function of transmitting control information for handover restriction or restriction release to the mobile terminal 130 in accordance with instruction information from the monitoring system 100.

  FIG. 10 shows a configuration example of the mobile terminal 130. The mobile terminal 130 includes a communication processing unit 530, a surrounding base station radio wave state monitoring unit 540, a radio wave output reduced base station response unit 550, a radio wave 0 base station response unit 560, a radio wave output increase base station response unit 570, Terminal detection signal transmission / reception unit 580, terminal detection signal monitoring unit 590, peripheral base station database 600 that stores peripheral base station information, terminal information database 610 that stores terminal information, and control information that stores control information A database 620.

  The communication processing unit 530 has a function of performing communication with the base station 120. The terminal detection signal transmission / reception unit 580 has a function of performing communication with the base station 120. The communication processing unit 530 includes a reception unit 501 and a transmission unit 502. The neighboring base station radio wave state monitoring unit 540 includes a base station radio wave state collecting unit 503, a radio wave 0 base station detecting unit 504, a radio wave output decreasing base station detecting unit 505, and a radio wave output increasing base station detecting unit 506.

  The radio wave output reduced base station support unit 550 includes a control information acquisition unit 507 and a control information storage unit 508. The radio wave 0 base station corresponding unit 560 includes a radio wave 0 base station monitoring unit 510, a neighboring base station information reference unit 511, and a radio wave 0 base station information transmission unit 512. The radio wave output increased base station support unit 570 includes a handover control unit 513, a control information deletion unit 514, a control information reference unit 515, a handover execution storage unit 516, a neighboring base station information reference unit 517, and base station restoration information. A notification unit 518 for notifying location registration information and control information cancellation.

  The terminal detection signal transmission / reception unit 580 includes a terminal detection signal reception unit 519 and a terminal detection signal response signal transmission unit 520. The terminal detection signal monitoring unit 590 includes a terminal detection signal control unit 521 and a terminal detection signal response signal generation unit 522.

  The mobile terminal 130 has a function of receiving a terminal detection signal transmitted from the base station 120 in accordance with the instruction information from the monitoring system 100 and returning a response thereof. According to the release control information, a function for limiting handover or releasing the limitation is provided.

  FIG. 11 to FIG. 14 show an example of an operation sequence after detection of a faulty base station, detection of a mobile terminal that cannot communicate under a faulty base station, relief of communication of a mobile terminal that cannot communicate, and restoration of the faulty base station. FIG. 11 shows an example of an operation sequence for detecting a failure in the base station. The base station 120b monitors the communication state with the other base station 120a (11-1). The mobile terminal 130a and the mobile terminal 130b monitor received radio waves from the plurality of base stations 120a and 120b (11-2 and 11-3).

  It is assumed that the base station 120a is in a function stop state due to a failure. The base station 120b detects the inability to communicate with the base station 120a (11-4), stores the base station information of the base station 120a in the neighboring base station database 430 (11-5), and The base station information of the base station a is transmitted (11-6).

  The monitoring system 100 receives failure information including base station information of the base station 120a from the base station 120b (11-7). Thereby, the monitoring system 100 recognizes that the base station 120a is in a function stop state and cannot be used for communication services.

  The mobile terminal 130b detects that the level of the received radio wave of the base station 120a has become zero (11-8), and stores the base station information of the base station 120a in the neighboring base station database 600 (11-9). ) The base station information of the base station a is transmitted and notified to the base station 120b from which the broadcast information is received (11-10).

  The base station 120b that has received the base station information of the base station 120a transmits the base station information of the base station a to the monitoring system 100 (11-11). Thereby, the monitoring system 100 recognizes that the base station 120a is in a function stop state and is in a state where communication service cannot be provided (11-12).

  Further, the mobile terminal 130a detects that the received radio wave level of the base station 120a has become zero (11-13), and stores the base station information of the base station 120a in the neighboring base station database 600 (11-14). ) Try to transmit the base station information of the base station a to other base stations. However, it is determined that there is no other base station from which broadcast information is received (communication is impossible with any base station) (11-15), and a transition is made to a terminal detection signal reception state (11-16). Thereby, the portable terminal 130a becomes a state which can receive the signal for a terminal detection from the monitoring system 100 (11-17).

  FIG. 12 shows an example of an operation sequence for detecting an incommunicable portable terminal under a faulty base station. The monitoring system 100 searches the base station location database 170 for surviving base stations around the faulty base station 120a (12-1). The base station information (ID) of the surviving base station 120b extracted by the search is stored in the neighboring base station database 280 (12-2). After that, the terminal base station 120b is instructed to transmit a terminal detection signal (12-3).

  When the surviving base station 120b receives the terminal detection signal transmission instruction, the surviving base station 120b transmits the terminal detection signal toward the area including the area under the faulty base station 120a (12-4). When the mobile terminal 130a under the faulty base station 120a receives the terminal detection signal (12-5), the mobile terminal 130a stores the terminal identification information (ID) and the located area information in the terminal information database 610 (12-6).

  Then, terminal information including terminal identification information (ID) and area information is added to the response signal and transmitted to the surviving base station 120b (12-7). Thereby, the portable terminal 130a is in a state of responding to the terminal detection signal. The surviving base station 120b transmits the received response signal (terminal information) to the monitoring system 100 (12-8).

  The monitoring system 100 recognizes the received terminal information as a portable terminal that responds to the transmission of the terminal detection signal, and totals the number of portable terminals as the number of portable terminals that need relief, and calculates the number of portable terminals. Then, it is stored in the relief information database 290 (12-9). Thereby, the monitoring system 100 grasps the number of portable terminals to be relieved.

  FIG. 13 shows an example of an operation sequence for relieving a mobile terminal under a faulty base station. The monitoring system 100 extracts the surviving base station from the neighboring base station database 280 (13-1), and instructs the extracted surviving base station 120b to reduce the radio wave output level. (13-2)

  When the base station 120b receives an instruction to reduce the radio wave output level, the base station 120b reduces the output level of the transmission radio wave, and gives control information for restricting handover to the base station 120b to the broadcast information to the subordinate mobile terminal 130b. Transmit (13-3). Thereby, the base station 120b can reduce the number of management terminals in the own base station.

  When the mobile terminal 130b detects control information in the broadcast information from the base station 120b that has lowered the radio wave output level, the mobile terminal 130b determines whether there is another base station having a stronger received radio wave level than the base station 120b. If it is determined that there is a base station 120c with a stronger received radio wave level, the control information in the broadcast information of the base station 120b and the base station identification information (ID) of the base station 120b are stored in the control information database 620 (13). -4).

  Thereafter, the mobile terminal 130b performs a handover to the base station 120c having a stronger received radio wave (13-5). After the handover, the mobile terminal 130b stores the base station identification information (ID) and handover execution information of the handover destination base station 120c in the control information database 620 (13-6). Then, the base station 120b is notified of the completion of the handover (13-7).

  On the other hand, the base station 120b, which has been handed over to the base station 120c due to a decrease in the radio wave output level and the number of mobile terminals using the communication service under control, notifies the monitoring system 100 of the information of the handed over mobile terminals (13-8). ). The monitoring system 100 stores the mobile terminal information notified from the base station 120b in the rescue information database 290 (13-9).

  Thereafter, the monitoring system 100 instructs the base station 120b to increase the radio wave output level and increase the number of management terminals (13-10). Upon receiving the instruction to increase the radio wave output level and increase the number of management terminals, the base station 120b increases the radio wave output level and sets the threshold value for the number of management terminals to a large value (13-11).

  Accordingly, the broadcast information from the base station 120b is received by the mobile terminal 120a, the location registration request from the mobile terminal 120a is received by the base station 120b (13-12), and the mobile terminal 130a is handed over to the base station 120b. Will be able to. As a result, the mobile terminal 130a that cannot use the communication service can receive the communication service via the base station 120b and is relieved.

  The base station 120b notifies the monitoring system 100 of the terminal information of the portable terminal 130a rescued by the handover as rescue terminal information (13-13). Upon receiving the rescue terminal information from the base station 120b, the monitoring system 100 stores the rescue terminal information in the rescue information database 290 (13-14). Accordingly, the monitoring system 100 can grasp the rescued mobile terminal.

  FIG. 14 shows an example of an operation sequence after the failure base station is restored. It is assumed that the function of the base station 120a, which has been in a function stop state, is restored and transmission of radio waves for notification information is started. The mobile terminal 130a that has moved under the management of the surviving base station 120b receives radio waves from the base station 120a (14-1).

  The portable terminal 130a searches the neighboring base station database 600 to determine whether the received notification information from the base station 120a is for a base station whose reception radio wave level has previously become zero. When it is determined that the received radio wave level is that of the base station, the mobile terminal 130a determines that the base station 120a has been restored and notifies the base station 120b of the base station information of the base station 120a (14- 2).

  When the base station 120b receives the base station information of the base station 120a from the mobile terminal portable terminal 130a, the base station 120b notifies the monitoring system 100 of the base station information (14-3). Upon receiving the notification of the base station information, the monitoring system 100 instructs the base station 120c that manages the mobile terminal 130b to delete control information that restricts the handover of the mobile terminal 130b to the base station 120b. A signal is transmitted (14-4).

  When receiving the control information deletion instruction, the base station 120c instructs the portable terminal 130b to delete the control information that restricts the handover to the base station 120b (14-5). When receiving the instruction to delete the control information, the portable terminal 120b deletes the control information for restricting handover to the base station 120b stored in the control information database 620 (14-6).

  The mobile terminal 130b notifies the base station 120c of the completion of deletion of the handover restriction control information (14-7), and upon receiving the notification, the base station 120c notifies the monitoring system 100 accordingly (14). -8). As a result, the mobile terminal 130b can perform a handover to the base station 120b (14-9), and the mobile terminal 130a can also perform a handover to the restored base station 120a (14-10).

  FIG. 15 shows an example of an operation flow of the mobile terminal that detects an abnormality of the base station. The mobile terminal 130a and the mobile terminal 130b monitor whether or not the notification information periodically transmitted from the base station 120a is received by the communication processing unit 530 (15-1). When the base station 120a is in a function stop state, the radio wave output level from the base station 120a instantaneously becomes zero, and the mobile terminal 130a and the mobile terminal 130b detect this with the radio wave 0 base station detection unit 504 (15− 2).

  When the mobile terminal 130a and the mobile terminal 130b monitor that the radio wave level received from the base station is zero by the radio wave 0 base station monitoring unit 510 for a certain period of time (15-3), The base station identification information (ID) whose received radio wave level is zero is stored in the neighboring base station database 600 (15-4).

  The portable terminal 130a and the portable terminal 130b confirm whether or not there is a base station that receives radio waves of the notification information from other than the base station 120a (15-5). When the mobile terminal 130b determines that there is another base station 120b that can receive radio waves, the base station identification information (ID) of the base station 120a whose received radio wave level has become zero is used as fault information to transmit radio wave 0 base station information. The data is transmitted from the unit 512 to the base station 120b (15-6). The mobile terminal 130a that has determined that there is no other base station 120b that receives radio waves causes the terminal detection signal control unit 521 to transition to the terminal detection signal reception state (15-7).

  FIG. 16 shows an example of the operation flow of another base station that detects a failure in the base station. With reference to (a) of FIG. 16, the example of the operation | movement flow which the base station 120b itself detects is demonstrated. In the base station 120b, the neighboring base station monitoring unit 320 regularly monitors the communication availability of neighboring base stations (16-1). When it is detected that the base station 120a is in a communication disabled state due to the function stop (16-2), it is confirmed whether or not communication is disabled for a certain time (16-3).

  When it is determined that communication is impossible for a certain period of time, the base station identification information (ID) of the base station 120a that has been in a function stop state is stored in the peripheral base station database 430 (16-4). Thereafter, the base station 120b determines whether or not it is possible to communicate with the monitoring system 100 (16-5), and when it is determined that communication is possible, the base station that has been disabled due to the communication impossible peripheral base station information transmitting unit 301. Station identification information (ID) is transmitted to the monitoring system 100 (16-6).

  Next, an example of an operation flow for detecting a failure of the base station 120a based on a notification from the mobile terminal 130b will be described with reference to FIG. The base station 120b can receive the failure information of the base station 120a from the mobile terminal 130b by the radio wave 0 base station failure information receiving unit 310.

  The base station 120b monitors the reception of the failure information of the base station from the mobile terminal (16-7). When the failure information of the base station 120a is received from the mobile terminal 130b that has detected that the communication failure of the failed base station 120a is detected (16-8), the base station identification information (ID) of the base station 120a is stored in the neighboring base station database 430. (16-9).

  Thereafter, the base station 120b determines whether or not communication with the monitoring system 100 is possible (16-10), and if communication is possible, the communication base station information transmission unit 301 that cannot communicate with the monitoring system 100 makes communication impossible. The base station identification information (ID) transmitted is transmitted to the monitoring system 100 (16-11).

  17 and 18 show an example of an operation flow for determining a base station failure in the monitoring system 100. FIG. The monitoring system 100 monitors the failure information of the base station notified from the base station 120b or the portable terminal 130a by the base station failure information receiving unit 240 (17-1). Upon receiving the failure information of the base station 120a (17-2), the monitoring system 100 stores the base station identification information (ID) of the base station 120a that has become unable to communicate in the neighboring base station database 280 (17-3). .

  Then, the monitoring system 100 refers to the base station location information database 170 by the information collecting unit 202, and determines the failed base station from the base station identification information (ID) of the base station 120a that is disabled by the failed area specifying unit 203. An area is specified (17-4). The identified area name is stored in the neighboring base station database 280 (17-5). The monitoring system 100 acquires disaster information from the disaster information database 160 such as the Japan Meteorological Agency using the disaster information acquisition unit 201, and checks whether a disaster has occurred (17-6).

  Based on the disaster information acquired from the disaster information database 160, the monitoring system 100 determines whether or not a disaster has occurred immediately before the failure detection time of the base station 120a (18-1), and a disaster has just occurred. If it is determined that the failure has occurred, the failure-disaster area comparison unit 204 compares the area of the base station 120a that has become unable to communicate with the disaster occurrence area (18-2).

  Then, it is determined whether or not both areas match (18-3). If both areas match, the notification from the base station 120b or the mobile terminal 130b is correct and a disaster occurs in the area of the base station 120a. Then, it is determined that the base station 120a has been continuously unable to communicate (18-4). Thereafter, the monitoring system 100 performs a communication relief process for the mobile terminals 130a under the base station 120a.

  On the other hand, as a result of the comparison by the failure-disaster area comparison unit 204, when the area of the base station 120a that has become unable to communicate with the disaster occurrence area does not match, the relief determination unit 205 performs the base station location information database 170 and the map. With reference to the information database 180, it is evaluated whether or not the terrain around the base station where communication is disabled is likely to cause communication failure (18-5).

  It is determined whether or not the terrain around the base station that has become unable to communicate is a terrain where there is an obstacle that rapidly deteriorates the received radio wave, such as a tunnel (18-6). If it is determined that there is not, the notification from the base station 120b or the mobile terminal 130b is correct, and it is determined that the base station 120a is in a state where communication is not possible continuously (18-4). Thereafter, the monitoring system 100 instructs the rescue process to the mobile terminal 130a under the base station 120a.

  When it is determined that the terrain around the base station where communication is disabled is a terrain where there is an obstacle such as a tunnel that suddenly deteriorates the received radio wave, the identification information (ID of the base station 120a detected as the communication disabled state (ID) ) Is matched with the identification information (ID) of the base station detected as being in a communication impossible state for a predetermined number of times or more within a certain past period using the neighboring base station database 280 (18-7) .

  When the identification information (ID) of the base station detected as the communication disabled state matches the identification information (ID) of the base station detected as the communication disabled state a predetermined number of times or more within a certain past period (18-8) ), The notification from the base station 120b or the portable terminal 130b is correct, and it is determined that the base station 120a is continuously in a state where communication is not possible (18-4). Thereafter, the monitoring system 100 instructs the rescue process to the mobile terminal 130a under the base station 120a.

  When the identification information (ID) of the base station detected as the communication disabled state does not match the identification information (ID) of the base station detected as the communication disabled state for a predetermined number of times or more within a certain fixed period in the past, the base station 120b Alternatively, the communication failure notification from the mobile terminal 130b is determined as a temporary communication failure notification, and the monitoring system 100 does not instruct the rescue processing of the mobile terminal 130a under the base station 120a (18-9).

  FIG. 19 shows an example of an operation flow of the monitoring system 100 that detects the mobile terminal 130a under the faulty base station 120a. The monitoring system 100 investigates the number of mobile terminals to be relieved in order to perform remediation processing for the mobile terminals 130a under the base station 120a that has become unable to communicate.

  For this purpose, the monitoring system 100 refers to the base station location information database 170 and searches for a surviving base station 120b around the faulty base station 120a (19-1). The searched base station identification information (ID) of the surviving base station 120b is stored in the neighboring base station database 280 (19-2).

  Then, the monitoring system 100 instructs the living base station 120b to transmit a terminal detection signal by the terminal detection signal transmission unit 210 (19-3). The monitoring system 100 waits for the response of the instruction result from the base station 120b by the response signal receiving unit 211 (19-4), and when receiving the response of the instruction result (19-5), the response terminal number calculation processing unit 209 Thus, the number of mobile terminals responding to the terminal detection signal is totaled. Then, the totaling result is stored in the relief information database 290 (19-6). Thereby, the monitoring system 100 grasps the number of portable terminals to be relieved.

  FIG. 20 shows an example of an operation flow of the base station 120b that detects the mobile terminal 130a under the faulty base station 120a. The surviving base station 120b adjacent to the faulty base station 120a monitors reception of a terminal detection signal transmission instruction from the monitoring system 100 by the terminal detection signal receiving unit 306 (20-1), When the transmission instruction is received, the terminal detection signal transmitter 315 transmits a terminal detection signal toward the area under the faulty base station 120a (to the mobile terminal 130a) (20-3).

  The base station 120b monitors the reception of the response signal from the mobile terminal 130a by the terminal detection signal monitoring unit 390 (20-4), and receives the response signal by the terminal detection response signal reception unit 314 (20− 5) The terminal information of the portable terminal 130a in the received signal is stored in the rescue information database 370 (20-6).

  After transmitting the terminal detection signal, the base station 120b monitors the elapse of a predetermined time (20-7), and after the elapse of the predetermined time, the terminal detection response signal transmission unit 305 responds to the monitoring system 100. The result is transmitted (20-8).

  FIG. 21 shows an operation flow example of the mobile terminal 130a in detecting the mobile terminal 130a under the faulty base station 120a. When the mobile terminal 130a under the faulty base station 120a determines that there is no base station that can receive a radio wave and can be handed over, the terminal detection signal control unit 521 transits to a terminal detection signal reception state (21 -1), the reception of the terminal detection signal is monitored (21-2).

  When the terminal detection signal receiving unit 519 receives the terminal detection signal from the base station 120b (21-3), the terminal detection signal control unit 521 acquires the terminal information of the terminal information database 610 to 130a. (21-4). After acquiring the terminal information, the terminal detection signal response signal generation unit 522 generates a response signal, and the terminal detection signal response signal transmission unit 520 transmits the response signal to the base station 120b (21-5). As a result, the mobile terminal 130a under the faulty base station 120a can notify the monitoring system 100 of a state where the communication service cannot be continued, and can receive relief.

  FIG. 22 shows an example of an operation flow of the monitoring system 100 that relieves the mobile terminal 130a that cannot use the communication service. The monitoring system 100 that grasps the number of portable terminals 130a to be rescued uses the rescue processing control unit 212 to make the bases of the surviving base stations 120b available in order for the surviving base stations 120b to rescue the communication of the mobile terminals 130a. Station identification information (ID) is acquired from the neighboring base station database 280 (22-1).

  Then, the monitoring system 100 determines an instruction to lower the radio wave output level of the surviving base station 120b by the processing instruction unit 213, generates a message to instruct to lower the radio wave output level by the output increase / decrease instruction unit 214, and transmits an instruction transmission unit 217. Transmits an instruction to lower the radio wave output level to the surviving base station 120b (22-2).

  The monitoring system 100 waits for a response of an instruction result including the terminal information of the mobile terminal 130b handed over from the surviving base station 120b to another base station 120c by the handover / relief terminal number receiving unit 218 (22-3), (22-4), the rescue processing control unit 212 stores the terminal information in the rescue information database 290 (22-5).

  Thereafter, the monitoring system 100 determines an instruction to increase the radio wave output level and increase the threshold value of the number of management terminals to the surviving base station 120b by the processing instruction unit 213. Then, the output increase / decrease instructing unit 214 generates an instruction to increase the radio wave output level, the management terminal number change instructing unit 216 generates an instruction to increase the threshold of the management terminal number, and the instruction transmitting unit 217 transmits the instruction to the surviving base station 120b. Then, an instruction to increase the radio wave output level and increase the number of management terminals is transmitted (22-6).

  The monitoring system 100 waits for a response of the instruction result including the terminal information of the rescued portable terminal 130a from the surviving base station 120b by the handover / rescue terminal number receiving unit 218 (22-7), and receives the response (22-7). -8) The terminal information is stored in the repair information database 290 by the repair processing control unit 212 (22-9). Thereby, the monitoring system 100 can relieve the mobile terminal 130a in which the communication service cannot be used by the available survival base station 120b.

  23 and 24 show an example of an operation flow of the base station 120b that rescues the mobile terminal 130a that cannot use the communication service. The surviving base station 120b adjacent to the faulty base station 120a monitors the reception of the instruction to decrease the radio wave output level from the monitoring system 100 (23-1), and the radio wave output increase / decrease processing instruction receiving unit 307 decreases the radio wave output level. Is received (23-2), the radio wave output increase / decrease processing unit 400 performs a process of reducing the radio wave output level (23-3).

  Thereafter, the base station 120b waits for a response (location registration) from the mobile terminal 130b handed over to another base station 120c due to the decrease in the radio wave output level (23-4), and the response is sent to the mobile location registration receiving unit 313. (23-5), the terminal information of the handed over portable terminal 130b is stored in the rescue information database 370 (23-6).

  After the saving, the repair required number comparison processing unit 380 compares the number of portable terminals that have been handed over with the number of portable terminals necessary for the repair (23-7). When the number of mobile terminals that have been handed over is less than the number of mobile terminals that need to be relieved (23-8no), it is determined that a process for further reducing the radio wave output level of the base station 120b is necessary, and the radio wave output increase / decrease processing unit 400 Then, processing for further reducing the radio wave output level is performed (23-3).

  On the other hand, if the number of portable terminals that have been handed over is greater than the number of portable terminals that need to be relieved (23-8 yes), it is determined that the process of further reducing the radio wave output level of the base station 120b is unnecessary, Then, the processing result of the decrease in the radio wave output level is transmitted to the monitoring system 100 (23-9).

  Thereafter, the base station 120b monitors the reception of the radio wave output increase instruction from the monitoring system 100 (24-1), and the radio wave output increase / decrease processing instruction reception unit 307 issues an instruction to increase the radio wave output level from the monitoring system 100. Upon reception (24-2), the radio wave output increase / decrease processing unit 400 increases the radio wave output level. When the management terminal number change instruction receiving unit 308 receives a change instruction to increase the number of management terminals from the monitoring system 100, the management terminal number change processing unit 410 performs processing to increase the threshold value of the management terminals ( 24-3).

  Thereafter, the portable location registration receiving unit 313 waits for a response (location registration) of the rescued portable terminal 130a (24-4), and when the response is received (24-5), rescues the terminal information of the rescued portable terminal 130a. The information is stored in the information database 370 (24-6). After that, the repair required number transmission unit 304 transmits the processing result of the change of the radio wave output level enhancement and the management terminal number increase to the monitoring system 100 (24-7). As a result, the base station 120b can rescue the mobile terminal 130a that has become unavailable for the communication service.

  25 and 26 show an example of an operation flow of another mobile terminal 130b when the mobile terminal 130a that cannot use the communication service is rescued. FIG. 25 shows an example of an operation flow when a forced handover to another base station 120c is performed, and FIG. 26 shows an example of an operation flow after the forced handover is performed.

  The mobile terminal 130b subordinate to the surviving base station 120b adjacent to the faulty base station 120a monitors the reception of broadcast information periodically transmitted from the surviving base station 120b by the communication processing unit 530, and the base station radio wave state collecting unit 503. (25-1). When the mobile terminal 130b detects a decrease in radio wave output level from the base station 120b and forced handover control information by the radio wave output reduced base station detection unit 505 (25-2), there is no base station with stronger received radio waves. (25-3).

  When the mobile terminal 130b confirms that the base station 120c with stronger radio waves exists, the base station identification information (ID) and control information of the base station 120b are acquired by the reception control information acquisition unit 507, and the acquired base station The identification information (ID) and control information are stored in the control information database 620 by the control information storage unit 508 (25-4). Thereafter, the mobile terminal 130b performs a forced handover to the base station 120c having a stronger received radio wave (25-5, 25-6).

  After the completion of the handover to the base station 120c, the portable terminal 130b stores the information on the completion of the handover to the base station 120c in the control information database 620 by the handover execution storage unit 516 based on the control information of the base station 120b. (25-7). Thereafter, the notification unit 518 notifies the base station 120c of the completion of handover (25-8). As a result, the mobile terminal 130b moves under the control of the base station 120c adjacent to the base station 120b, and as a result, the base station 120b can accommodate and repair the mobile terminal 130a that cannot use the communication service. It can be the environment.

  Next, an operation when the mobile terminal 130b increases the radio wave output level of the base station 120b after performing the handover to the base station 120c will be described. The portable terminal 130b monitors the received radio wave from the base station by the surrounding base station radio wave state monitoring unit 540 (26-1). When the radio wave output increased base station detection unit 506 detects that the radio wave output level from the base station 120b has increased (26-2), the control information reference unit 515 obtains the detected base station information of the base station 120b. Then, it is confirmed whether it is stored in the control information database 620 (26-3).

  If the control information of the base station 120b is included in the control information database 620 (26-4 yes), the mobile terminal 130b determines that there is a history of forced handover from the base station 120b, and the base station Handover to 120b is not performed (26-5).

  When the control information of the base station 120b is not included in the control information database 620 (26-4no), the mobile terminal 130b performs a normal handover to the base station 120b by the handover control unit 513 (26- 6). Thereby, the mobile terminal 130b can prevent re-handover from being performed to the base station 120b when the radio wave output level of the base station 120b is increased.

  FIG. 27 shows an example of an operation flow of the mobile terminal 130a at the time of rescue of the mobile terminal 130a that cannot use the communication service. The mobile terminal 130a under the faulty base station 120a receives broadcast information periodically transmitted from the base station by the communication processing unit 530 and collects it by the base station radio wave state collection unit 503 (27-1).

  When the radio wave output increased base station detection unit 506 detects that the radio wave output level from the base station 120b has increased (27-2), the mobile terminal 130a performs the handover to the base station 120b. The location is registered in 120b (27-3). Thereby, the portable terminal 130a is relieved by the base station 120b, and can receive standby and communication services in the normal operation state via the base station 120b (27-4).

  FIG. 28 shows an example of the operation flow of the monitoring system 100 when the failed base station is restored. The monitoring system 100 monitors the reception of the base station information indicating that the failed base station 120a has been restored from the surviving base station 120b (28-1), and receives the base station information (28-2). The search unit 206 searches the home location register (HLR) 190 and the rescue information database 290 to extract terminal information of the mobile terminal 130b that has performed the forced handover (28-3).

  After the terminal information is extracted, the handover terminal search unit 206 searches the neighboring base station database 280 to extract the base station 120c that manages the mobile terminal 130b that has been forcibly handed over (28-4). Then, the control information release transmitting unit 215 instructs the extracted base station 120c to notify the control information release (cancellation of handover restriction to the base station 120b by the mobile terminal 130b) (28-5).

  Thereafter, the monitoring system 100 waits for a control information release instruction result response from the base station 120c by the control information release terminal information receiving unit 207 (28-6), and receives the response of the instruction result (28-7). ), The terminal information of the portable terminal 130b included in the response of the instruction result is stored in the relief information database 290 (28-8). As a result, the monitoring system 100 enables handover to the base station 120b for the mobile terminal 130b that has restricted handover to the base station 120b.

  FIG. 29 shows an example of an operation flow of the base station when the failed base station is restored. FIG. 29A illustrates an example of an operation flow of the base station 120b, and FIG. 29B illustrates an example of an operation flow of the base station 120c. The base station 120b that accommodates the rescued mobile terminal 130a monitors the reception of the recovery notification of the base station 120a from the mobile terminal 130a by the failed base station recovery notification receiving unit 311 (29-1). (29-2), the base station information of the base station 120a is stored in the neighboring base station database 430 (29-3).

  Thereafter, the base station 120b transmits the base station information of the recovered base station 120a to the monitoring system 100 through the failed base station recovery information transmission unit 302 (29-4). Thereby, the monitoring system 100 can grasp that the base station 120a has been restored.

  On the other hand, the base station 120c accommodating the mobile terminal 130b that has performed the forced handover monitors the reception of the control information release instruction from the monitoring system 100 by the control information release instruction receiving unit 309 (29-5), When the control information release instruction is received (29-6), the handover terminal search unit 420 searches the home location register (HLR) 190 and extracts the mobile terminal 130b forcibly handed over (29-7).

  After extracting the mobile terminal 130b forcibly handed over, the control information release instruction transmission unit 316 gives the control release instruction to the broadcast information and transmits it to the mobile terminal 130b forcibly handed over (29-8). ).

  Thereafter, the control release notification receiving unit 312 monitors reception of the result of the control release from the mobile terminal 130b (release of handover restriction to the base station 120b) (29-9), and notifies the result of the control release. (29-10), the control release notification transmission unit 303 notifies the monitoring system 100 of the control release result (29-11). Accordingly, the mobile terminal 130b that has been restricted from being handed over to the base station 120b can perform the hand-over to the base station 120b.

  FIG. 30 shows an example of an operation flow of the rescued mobile terminal 130a when the failed base station is restored. The mobile terminal 130a rescued by the base station 120b monitors reception of broadcast information periodically transmitted from the base station, and collects it by the base station radio wave state collection unit 503 (30-1). When the radio wave output increasing base station detection unit 506 detects that the radio wave output level from the base station 120a has increased (30-2), the base station 120a detected by the neighboring base station information reference unit 517 It is checked by searching the neighboring base station database 600 whether the received radio wave level matches the base station having become zero (30-3).

  When the detected base station 120a matches the base station whose received radio wave level has previously become zero (30-4 yes), it is determined that the function stop state of the base station 120a has been restored, and the base station 120b is notified from the notification unit 518. Is notified of the base station restoration (30-5). Thereby, the monitoring system 100 can grasp that the base station 120a has been restored via the base station 120b.

  FIG. 31 shows an example of an operation flow of the mobile terminal 130b that supports the rescue when the faulty base station is restored. The mobile terminal 130b that has forcibly handed over to the base station 120c receives the control release instruction (instruction for releasing the handover restriction to the base station 120b) included in the broadcast information from the base station 120c in the communication processing unit 530. (31-1), and when receiving the control release instruction (31-2), the control information deleting unit 514 includes the base station of the base station 120b that is included in the control information database 620 and is subject to handover restriction. The information is deleted (31-3).

  After deleting the base station information, the mobile terminal 130b notifies the base station 130c that the control information has been deleted from the notification unit 518 (31-4). As a result, the mobile terminal 130b that has been restricted from being handed over to the base station 120b can perform handover to the base station 120b.

  FIG. 32 shows an example of database storage information held in the monitoring system 100. The peripheral base station database 280 stores (1) a base station identifier and a detection date and time as information regarding the base station when the mobile terminal detects a faulty base station having a reception radio wave output level of zero. "Base station information", and (2) When the base station detects a faulty base station that cannot communicate, as information about the base station, "base station information that cannot be communicated" that stores a base station identifier and a detection date and time, (3) Referring to the base station location information database 170, the mobile station or the base station holds the “failed base station area name” that stores the base station identifier and installation location name of the failed base station.

  The base station location information database 170 stores (1) an “area name” that stores the location and area name of the failed base station, and (2) a neighboring base station identifier that exists around the failed base station. Base station information ". The disaster information database 160 (1) holds “disaster occurrence information” that stores the occurrence date / time, occurrence area, and scale obtained from the disaster information held by the external system.

  The map information database 180 is (1) “area name” that stores the area name and latitude / longitude obtained from the map information held by the external system, and (2) obtained as topographic information from the map information that is also held by the external system. It holds “terrain information” that stores the presence / absence of tunnels, mountains, and high-rise buildings.

  The rescue information database 290 is (1) information on the mobile terminal that has responded to the terminal detection signal when attempting to rescue the mobile terminal that is unable to communicate, and the response mobile terminal and response date and time. “Number of terminal detection signal responses” for storing the number, and (2) “handover terminal for storing handover handheld identifier, handover date and time, and number of handover terminals, which are response information from the mobile terminal forcibly handed over Information ”and (3)“ rescue terminal information ”that stores the rescued mobile identifier, the rescue date and time, and the number of rescue terminals, which are response information from the mobile terminal rescued from the inability to communicate.

  FIG. 33 shows an example of stored information in the database held in the base station. The peripheral base station database 430 stores a base station identifier and a detection date and time as information on the base station when the mobile terminal detects a faulty base station having a zero received radio wave level. Station information ”and (2)“ Unavailable base station information ”that stores the base station identifier and the date and time of detection when the base station detects a failed base station that cannot communicate. To do.

  The rescue information database 370 is (1) information on the mobile terminal that responds to the terminal detection signal when attempting to rescue the mobile terminal that is unable to communicate, the responding mobile identifier, the response date and time, and the response terminal “Number of terminal detection signal responses” that stores the number, and (2) the identifier of the mobile terminal that performed the handover, the handover date and time, and the number of handover terminals, which are response information from the mobile terminal forcibly handed over “Handover terminal information” to be stored, and (3) “rescue terminal information” to store the rescued mobile identifier, the rescue date and time, and the number of rescue terminals, which are response information from the mobile terminal rescued from the communication disabled state. Is held.

  FIG. 34 shows an example of stored information in a database held in the mobile terminal. The peripheral base station database 600 stores the base station identifier and the detection date and time as information regarding the base station when the mobile terminal detects a faulty base station having a zero received radio wave level. Station information ".

  The control information database 620 includes (1) “pre-handover information” for storing a base station identifier before the forced handover is performed, and (2) a base station identifier after the forced handover is performed, a handover date and time, and a handover. It holds “post-handover information” for storing the execution result.

  The terminal information database 610 stores (1) a terminal identifier and an area in which the mobile terminal that has transitioned to the terminal detection signal reception state needs to return a response to the terminal detection signal. Possess information.

  As described above, the disclosed monitoring system can realize the continuation of the communication service by grasping the mobile terminal under the failure base station and relieving it at the surviving base station when the base station failure occurs. Also, the base station can accept mobile terminals under the faulty base station by increasing or decreasing the radio wave output level or changing (increasing) the number of management terminals according to an instruction from the monitoring system.

  In addition, the mobile terminal in the communication disabled state transmits a response signal of the terminal detection signal, so that the communication is relieved by the handover from the failed base station to the adjacent base station, and the communication service can be continued. In addition, the mobile terminal in a communicable state under the control of the neighboring base station that performs the repair performs the handover from the neighboring base station to another neighboring base station, so that the neighboring base station to be repaired can Even when the number of mobile terminals being controlled or communicating has reached the manageable upper limit, the number of terminals being managed can be reduced, and the adjacent base station can communicate with mobile terminals under the faulty base station. It becomes possible to rescue.

  In addition, since the mobile terminal that receives the communication service can detect the failure of the serving base station and notify the failure base station to the monitoring system, the failure of the communication service that cannot be grasped by the host monitoring system Can be grasped.

The following additional notes are further disclosed with respect to the embodiment including the above examples.
(Appendix 1)
When one or more base stations out of a plurality of base stations used for mobile communication are in a fault state, the base station in the fault state (hereinafter referred to as a fault base station) is detected by the monitoring system. , Identifying steps,
A base station adjacent to the faulty base station that is not in a fault state (hereinafter referred to as a surviving base station) transmits a terminal detection signal to an area under the faulty base station, and the faulty base for the terminal detection signal is transmitted. Returning a response signal from an incommunicable terminal under the control of the monitoring system;
When the survival base station receives an instruction to enable communication with the predetermined number of terminals, the output level of the transmission radio wave is temporarily reduced, and a part of the terminals under the survival base station is transferred to another base station. A moving step;
In the monitoring system, based on the response signal, the number of incommunicable terminals is calculated, and an instruction to enable communication with a predetermined number of terminals based on the calculated number is transmitted to the surviving base station. And steps to
A mobile communication remedy method comprising:
(Appendix 2)
After controlling the terminal moved to the other base station to limit the handover so that the terminal under the living base station does not perform the handover under the living base station, the transmission radio wave The method of claim 1, further comprising the step of raising the output level of the mobile communication.
(Appendix 3)
A communication abnormality of the failed base station is detected by the surviving base station, and information on the failed base station is notified from the surviving base station to the monitoring system, or a communication abnormality of the failed base station is detected by the failed base station. Detecting at a subordinate terminal and notifying the monitoring system of information on the failed base station via the surviving base station;
In the monitoring system, a base station in a continuous fault state based on a plurality of information including information on the faulty base station notified from the surviving base station or the terminal and disaster information or terrain information acquired from an external system Detecting and identifying
The mobile communication remedy method according to appendix 1, characterized by comprising:
(Appendix 4)
A monitoring system that collects failure information and transmits instruction information to a plurality of base stations used for mobile communication,
Receiving means for receiving notification of information of a base station that has failed (hereinafter referred to as a failed base station);
A base station that is not in a fault state (hereinafter referred to as a surviving base station) adjacent to the faulty base station is caused to transmit a terminal detection signal to an area under the faulty base station, from a terminal under the faulty base station. An incommunicable terminal detection means for transmitting an instruction to return a response signal for the terminal detection signal and calculating the number of incommunicable terminals based on the returned response signal;
A remedy processing means for transmitting an instruction to enable communication with a predetermined number of terminals based on the calculated number to the surviving base station;
When the survival base station receives an instruction to enable communication with the predetermined number of terminals, the output level of the transmission radio wave is temporarily reduced, and a part of the terminals under the survival base station is transferred to another base station. Moving means for moving;
A mobile communication monitoring system comprising:
(Appendix 5)
An instruction to increase the output level of the transmission radio wave is transmitted to the terminal moved under the control of the other base station after controlling to limit the handover so that the handover to the subordinate of the surviving base station is not performed. The mobile communication monitoring system according to appendix 4, characterized by comprising means for performing
(Appendix 6)
The base station fault information receiving means for receiving notification of the information of the faulty base station from the surviving base station or from the terminal under the faulty base station via the surviving base station;
Based on a plurality of information including disaster base station information notified from the surviving base station or the terminal and disaster information or terrain information acquired from an external system, a base station in a continuous fault state is detected and specified. Fault information monitoring means;
The mobile communication monitoring system according to appendix 4, characterized by comprising:
(Appendix 7)
A base station used for mobile communication,
Information of a faulty base station detected by detecting an abnormality in communication with an adjacent faulty base station (hereinafter referred to as a faulty base station), or a fault detected by a terminal under the faulty base station and notified from the terminal Faulty base station information transmitting means for notifying the monitoring system of base station information;
In accordance with an instruction notified from the monitoring system, a terminal detection signal is transmitted to the area under the faulty base station, a response signal is received from the incommunicable terminal under the faulty base station with respect to the terminal detection signal, Processing means for detecting an incommunicable terminal for returning a response signal to the monitoring system;
Relief processing means for accommodating the calculated number of terminals in accordance with an instruction to enable communication with a predetermined number of terminals from the monitoring system that has calculated the number of incommunicable terminals based on the response signal;
When receiving an instruction to enable communication with the predetermined number of terminals, the moving means for temporarily reducing the output level of the transmission radio wave and moving a part of the terminals under its own station to another base station;
A mobile communication base station characterized by comprising:
(Appendix 8)
The rescue processing means controls the terminal moved to the other base station to limit the handover so that the handover to the subordinate of the surviving base station is not performed, and then the output level of the transmission radio wave The mobile communication base station according to claim 7, further comprising means for increasing the frequency.
(Appendix 9)
A terminal device used for mobile communication,
When a base station in a faulty state (hereinafter referred to as a faulty base station) is in the service area and a mobile communication service cannot be used, a base station that is adjacent to the faulty base station and is not in a faulty state (hereinafter referred to as survival) A response transmission means for returning a response signal to the surviving base station in response to the terminal detection signal when receiving the terminal detection signal transmitted from the base station);
When performing broadcast information transmitted from the surviving base station, handover executing means for performing a handover to the surviving base station;
A mobile means for performing a handover to another base station due to a decrease in the output level of a transmission radio wave from the living base station when located in the area of the living base station;
A terminal device for mobile communication, comprising:
(Appendix 10)
The mobile communication according to appendix 9, further comprising transmission means for detecting an abnormality in communication with the failed base station and notifying the monitoring system of information on the failed base station via the surviving base station. Terminal equipment.
(Appendix 11)
When the handover to the other base station is performed , the output level of the transmission radio wave of the surviving base station according to the control information that restricts the handover to the subordinate of the surviving base station notified from the surviving base station The mobile communication terminal device according to appendix 9, further comprising a handover restriction unit that restricts a handover to a subordinate of the surviving base station when it rises.

100 monitoring system 110 wireless network controller (BSC)
120a Faulty base station 120b Surviving base station 130a Mobile terminal with no communication 130b Mobile terminal with communication 140 Switch 150 Core network 160 Disaster information database

Claims (7)

When one or more base stations out of a plurality of base stations used for mobile communication are in a fault state, the base station in the fault state (hereinafter referred to as a fault base station) is detected by the monitoring system. , Identifying steps,
A base station adjacent to the faulty base station that is not in a fault state (hereinafter referred to as a surviving base station) transmits a terminal detection signal to an area under the faulty base station, and the faulty base for the terminal detection signal is transmitted. Returning a response signal from an incommunicable terminal under the control of the monitoring system;
In the monitoring system, based on the response signal, the number of incommunicable terminals is calculated, and an instruction to enable communication with a predetermined number of terminals based on the calculated number is transmitted to the surviving base station. And steps to
When the survival base station receives an instruction to enable communication with the predetermined number of terminals, the output level of the transmission radio wave is temporarily reduced, and a part of the terminals under the survival base station is transferred to another base station. A moving step;
A mobile communication remedy method comprising: Including a step of increasing the output level of the transmission radio wave after controlling to limit the handover so that the terminal moved to the other base station is not subjected to the handover under the control of the surviving base station. The mobile communication rescue method according to claim 1, wherein: A monitoring system that collects failure information and transmits instruction information to a plurality of base stations used for mobile communication,
Receiving means for receiving notification of information of a base station that has failed (hereinafter referred to as a failed base station);
A base station that is not in a fault state (hereinafter referred to as a surviving base station) adjacent to the faulty base station is caused to transmit a terminal detection signal to an area under the faulty base station, from a terminal under the faulty base station. An incommunicable terminal detection means for transmitting an instruction to return a response signal for the terminal detection signal and calculating the number of incommunicable terminals based on the returned response signal;
A remedy processing means for transmitting an instruction to enable communication with a predetermined number of terminals based on the calculated number to the surviving base station;
When the survival base station receives an instruction to enable communication with the predetermined number of terminals, the output level of the transmission radio wave is temporarily reduced, and a part of the terminals under the survival base station is transferred to another base station. Moving means for moving;
A mobile communication monitoring system comprising: An instruction to increase the output level of the transmission radio wave is transmitted to the terminal moved under the control of the other base station after controlling to limit the handover so that the handover to the subordinate of the surviving base station is not performed. The mobile communication monitoring system according to claim 3, further comprising: A base station used for mobile communication,
Information of a faulty base station detected by detecting an abnormality in communication with an adjacent faulty base station (hereinafter referred to as a faulty base station), or a fault detected by a terminal under the faulty base station and notified from the terminal Faulty base station information transmitting means for notifying the monitoring system of base station information;
In accordance with an instruction notified from the monitoring system, a terminal detection signal is transmitted to the area under the faulty base station, a response signal is received from the incommunicable terminal under the faulty base station with respect to the terminal detection signal, Processing means for detecting an incommunicable terminal for returning a response signal to the monitoring system;
Relief processing means for accommodating the calculated number of terminals in accordance with an instruction to enable communication with a predetermined number of terminals from the monitoring system that has calculated the number of incommunicable terminals based on the response signal;
When receiving an instruction to enable communication with the predetermined number of terminals, the moving means for temporarily reducing the output level of the transmission radio wave and moving a part of the terminals under its own station to another base station;
A mobile communication base station characterized by comprising: A terminal device used for mobile communication,
When a base station in a faulty state (hereinafter referred to as a faulty base station) is in the service area and a mobile communication service cannot be used, a base station that is adjacent to the faulty base station and is not in a faulty state (hereinafter referred to as survival) A response transmission means for returning a response signal to the surviving base station in response to the terminal detection signal when receiving the terminal detection signal transmitted from the base station);
When performing broadcast information transmitted from the surviving base station, handover executing means for performing a handover to the surviving base station;
A mobile means for performing a handover to another base station due to a decrease in the output level of a transmission radio wave from the living base station when located in the area of the living base station;
A terminal device for mobile communication, comprising: When the handover to the other base station is performed , the output level of the transmission radio wave of the surviving base station according to the control information that restricts the handover to the subordinate of the surviving base station notified from the surviving base station 7. The mobile communication terminal apparatus according to claim 6, further comprising a handover restricting unit that restricts a handover to a subordinate of the surviving base station when it rises.

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