JP2009218814A - Mobile communication system, approach detecting method thereof, terminal searching apparatus, location information management apparatus, and exchange - Google Patents

Abstract

An object of the present invention is to provide an efficient proximity detection method between portable terminals from the viewpoint of signal traffic.
A searcher-side device adds and transmits information on all other proximity detection target mobile terminals to a location information service request for a specific location search target mobile terminal. When the exchange 306 obtains information on all other proximity detection target mobile terminals in addition to the specific location search target mobile terminal, in addition to the specific location search target mobile terminal, all other proximity detection target Determine if the mobile device is in the service area. If all the mobile terminals targeted for proximity detection are located, a position determination request is transmitted to each of all other mobile terminals targeted for proximity detection in addition to the mobile terminal targeted for specific location search. When the wireless device 304 acquires the position determination request, the wireless device 304 performs position positioning in cooperation with a plurality of mobile terminals, and reports the position positioning result. The exchange 306 acquires the location information of all mobile terminals subject to proximity detection from the received location positioning result, and responds to the searcher side device 310 through the location information management device 308.
[Selection] Figure 2

Description

  The present invention relates to a mobile communication system and an approach detection method thereof, a terminal search device, a position information management device, and an exchange, and more specifically, a mobile communication system that detects an approach between a plurality of terminals, an approach detection method thereof, and a terminal The present invention relates to a search device, a position information management device, and an exchange.

  Currently, in a mobile network, many services for confirming location information of a specific partner who owns a mobile terminal from a website on a map are realized. As a further additional service, there is an increasing expectation for an approach detection service that automatically detects that a user who owns a mobile terminal designated in advance is near the user.

  A method for searching for location information of a specific mobile terminal in a mobile network is standardized in 3GPP TS23.271 by 3GPP (3rd Generation Partnership Project) and OMA (Open Mobile Alliance) (see Non-Patent Document 1).

  FIG. 1 is a sequence diagram showing the flow of this standardized location information search method.

  When making a location search request from the searcher side device (101), the searcher side device transmits an LCS (LoCation System) Service Request to the location information management device (102). The location information management device that has received the LCS Service Request transmits a Provide Subscriber Location to the exchange (103). The exchange that has received the Provide Subscriber Location transmits a Location Request to the wireless device (104). The wireless device that has received the Location Request performs positioning of the mobile terminal (105), and transmits the Location Report to the exchange (106). The exchange that has received the Location Report transmits a Provide Subscriber Location ack to the location information management device (107). The location information management device that has received the Provide Subscriber Location ack transmits an LCS Service Report to the searcher side device (108). The searcher side device acquires the search result from the received LCS Service Report (109), confirms the approaching state of the mobile terminal (110), and detects the approach (111).

  According to this method, in order to detect the approach between a plurality of mobile terminals, the above-described series of methods are performed individually and periodically on all mobile terminals subject to proximity detection, and the approach is determined based on the position information of each terminal. It is necessary to check the status.

3GPP TS23.271 V5.2.0 (2002-04), "LCS Architecture and General Network procedures"

  However, the above-described conventional approach detection method allows the position information search signal to be individually and periodically provided to all the mobile terminals that are the proximity detection targets in the mobile network, regardless of whether the search target terminals have approached or not. Will be sent and received. For this reason, the number of signals exchanged in proportion to the number of proximity detection target mobile terminals increases, and there is a problem that it is very inefficient from the viewpoint of signal traffic in constructing a mobile network.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an approach detection method between portable terminals that is more efficient from the viewpoint of signal traffic (the number of signals is small). is there.

  In order to achieve such an object, an approach detection method in a mobile communication system according to the present invention is an approach detection method of a terminal in a mobile communication system including a search device, a location information management device, an exchange, and a radio device. The search device holds information on the terminal of the proximity detection target, and adds information on all other proximity detection target terminals to the location information service request including the information of the specific location search target terminal. And the location information management device obtains information on all other proximity detection target terminals in addition to the specific location search target terminal, and then registers the subscriber's terminal location information. Extracting the position information of the specific position search target terminal from the person terminal information storage unit, adding the information of all other proximity detection target terminals to the extracted position information, and transmitting the information When the exchange acquires the location information, it searches the location information storage unit in which location information of the location terminal is registered, and in addition to the specific location search target terminal, all other proximity detections It is determined whether the target terminal is in the area, and if all the proximity detection target terminals are in the area, in addition to the specific position search target terminal, all other proximity detection target terminals Transmitting a position determination request to each of them, and when the wireless device acquires the position determination request, performing position positioning in cooperation with a plurality of terminals and reporting the result of the position determination; Acquiring the position information of all the proximity detection target terminals from the received result of the position measurement, and responding to the position information management device.

  Here, in the step of responding to the search device, the exchange searches for whether or not all other proximity detection target terminals are located in addition to the specific location search target terminal. If no one terminal is present, a response indicating that the approach detection target terminal is not approaching may be transmitted.

  According to another aspect of the present invention, the mobile communication system according to the present invention holds information on a terminal that is a proximity detection target, and includes all other information in a location information service request that includes information on a specific location search target terminal. A terminal search device that transmits information on a terminal that is subject to proximity detection, and a subscriber terminal information storage unit that registers the location information of the subscriber's terminal, in addition to the specific location search target terminal. When the information of all other proximity detection target terminals is acquired, the location information of the specific location search target terminal is extracted from the subscriber terminal information storage unit, and all the other proximity information is extracted from the extracted location information. A location information management device that adds and transmits information of a terminal to be detected, and a location terminal information storage unit in which location information of a location terminal is registered, and when the location information is acquired, the location terminal information Search the storage unit to In addition to the location search target terminal, it is determined whether all other proximity detection target terminals are present, and if all the proximity detection target terminals are present, the specific location search target In addition to the terminal, the exchange that transmits a position determination request to each of all other proximity detection target terminals, and when the position determination request is acquired, position positioning is performed in cooperation with a plurality of terminals, and the position positioning is performed. And the wireless device that acquires the location information of all the proximity detection target terminals based on the received location measurement result, and responds to the location information management device.

  Here, as a result of searching whether or not all of the other proximity detection target terminals are in the service area, in addition to the specific location search target terminal, the switchboard does not have at least one terminal in the service area. A response indicating that the approach detection target terminal is not approaching may be transmitted.

  According to another aspect of the present invention, a terminal search apparatus according to the present invention holds information about a terminal that is a proximity detection target, and transmits the held information about the terminal that is a proximity detection target; and A location information service request including information on a specific location search target terminal is added with information on all other proximity detection target terminals acquired from the terminal management unit and transmitted to the location information management device, and the location A transmission / reception unit that obtains position information of all other proximity detection target terminals in addition to the position information of the position search target terminal from the response received from the information management apparatus, and responds to the terminal management unit;

  According to another aspect of the present invention, a location information management device according to the present invention receives a location information service request when a location information service request is received from a subscriber terminal information storage unit in which location information of a subscriber's terminal is registered. From the first transmission / reception unit that transmits the information of the specific location search target terminal included in the request and the information of the other proximity detection target terminal, and from the first transmission / reception unit, the specific location search target In addition to the terminal, when acquiring information of all other proximity detection target terminals, the location information of the specific location search target terminal is extracted from the subscriber terminal information storage unit, and the extracted location information All of the proximity detection target terminals are added and transmitted to the exchange, and from the subscriber location information received from the exchange, in addition to the specific location search target terminal, all other proximity detection target terminals Up to location information Acquires the information of the un approaching state, and a second transmitting and receiving unit responsive to said first transmitting and receiving part.

  According to another aspect of the present invention, the exchange according to the present invention includes a visited terminal information storage unit in which position information of a located terminal is registered, a specific location search target terminal, and all other approaches. A first transmission / reception unit that acquires information to which information of a detection target terminal is added, and a search for the located terminal information storage unit, and the specific location search target acquired by the first transmission / reception unit In addition to the terminal, it is determined whether all other proximity detection target terminals are in the area, and if all the proximity detection target terminals are in the area, there is a normal response to the first transmission / reception unit. When receiving information on all other proximity detection target terminals in addition to the specific location search target terminal from the service area terminal search unit and the first transmission / reception unit that has received the normal response, the specific location In addition to the search target terminals, each of all other proximity detection target terminals Transmits a positioning request to the wireless device, the acquired position information of all the approach detection target terminal from the wireless device, and a second transmitting and receiving unit responsive to said first transmitting and receiving part.

  According to the present invention, compared with the conventional approach detection method between a plurality of mobile terminals based on the standardized 3GPP and OMA, the location search signal is shared, and the location state of the target terminal for proximity detection is considered. Add. Thereby, it is possible to reduce signals transmitted and received when the approach detection is performed.

  In addition, when it is determined that the mobile terminal is not approaching, it is possible to further reduce the signals transmitted and received.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 2 is a block diagram illustrating a configuration example of the mobile communication system according to the present embodiment.

  The mobile communication system according to the present embodiment is configured such that a searcher side device 310 is connected to a mobile network including a location information management device 308, an exchange 306, a wireless device 304, and a mobile terminal 302.

  The searcher side device 310 includes an approach detection target terminal management unit 332 and a location information service (LCS Service) transmission / reception unit 330.

  The proximity detection target terminal management unit 332 holds information on the proximity detection target terminal, transmits information on the proximity detection target terminal to the location information service transmission / reception unit 330, and based on a response from the location information service transmission / reception unit 330, The presence or absence of is detected.

  In the location information service transmission / reception unit 330, a location information service request (LCS Service Request) including information on a specific location search target mobile terminal according to the information on the proximity detection target terminal received from the proximity detection target terminal management unit 332 In addition, information on all other proximity detection target terminals is added and transmitted. In addition to the location information of the location search target terminal from the received location information service response (LCS Service Response), the location information of all other proximity detection target terminals or the non-access status is acquired, and the proximity detection target terminal It responds to the management unit 332.

  The location information management device 308 includes a location information service transmission / reception unit 328, a subscriber terminal information storage unit 327, and a subscriber location (Provide Subscriber Location) transmission / reception unit 326.

  In response to the received location information service request, the location information service transmission / reception unit 328 acquires information of all other proximity detection target terminals in addition to the specific location search target terminal, and transmits the information to the subscriber location transmission / reception unit 326. To do. Further, from the response from the subscriber position transmission / reception unit 326, in addition to the position information of the position search target terminal, the position information of all other proximity detection target terminals or the non-access state is acquired, and the position search target portable terminal To the location information service response to the location information and add the location information of all other proximity detection target terminals, or transmit an inaccessible state.

  The subscriber terminal information storage unit 327 stores subscriber terminal location information.

  In response to a request from the location information service transmission / reception unit 328, the subscriber location transmission / reception unit 326 extracts the location information of a specific location search target terminal from the subscriber terminal information storage unit 327, and in addition to the extracted location information, The information of all the proximity detection target terminals is added and transmitted. Further, from the received subscriber location acknowledgment (Provide Subscriber Location ack), in addition to the location information of the location search target terminal, the location information of all other proximity detection target terminals or the inaccessibility state is acquired, It responds to the location information service transmission / reception unit 328.

  The exchange 306 includes a subscriber location transmission / reception unit 324, a visited terminal search unit 322, a visited terminal information storage unit 321, and a location determination request / report (Location Req./Rep.) Transmission / reception unit 320.

  The subscriber location transmission / reception unit 324 acquires information on all other proximity detection target terminals in addition to the specific location search target terminal from the received subscriber location, and transmits the information to the located terminal search unit 322. When a normal response is received from the located terminal search unit 322, in addition to the position search target terminal, information on all other proximity detection target terminals is transmitted to the position determination request / report transmission / reception unit 320. In addition, when an abnormal response is received from the located terminal search unit 322, it is determined that the proximity detection target terminals are not approaching, and the non-access response is sent to the subscriber location transmission / reception unit 326 of the location information management device 308. Sent as an acknowledgment. In addition to the location information of the location search target terminal, the location information of all other proximity detection target terminals is acquired from the response from the location determination request / report transmission / reception unit 320, and the mobile terminal that is the location search target is subscribed. The position information of all other proximity detection target terminals is additionally given to the person's position and transmitted.

  In the located terminal information storage unit (location register) 321, the position information of the located terminals is registered.

  The located-terminal search unit 322 searches information registered in the located-terminal information storage unit 321 in response to a request from the subscriber location transmission / reception unit 324, and in addition to a specific location search target terminal, all other proximity detections It is determined whether or not the information of the target terminal is located under the local exchange, and if all the proximity detection target terminals are present, a normal response is made to the subscriber position transmission / reception unit 324. On the other hand, if at least one terminal is not located, it responds abnormally.

  In response to a request from the subscriber location transmission / reception unit 324, the location determination request / report transmission / reception unit 320 sends a location determination request (Location) to each of all other proximity detection target terminals in addition to one location search target terminal. Request). In addition, the location information of all the proximity detection target terminals is acquired from the received location determination report (Location Report) and responds to the subscriber location transmission / reception unit 324.

  The wireless device 304 includes a position determination request / report transmission / reception unit 318 and a position positioning control unit 316.

  The position determination request / report transmission / reception unit 318 detects the information of the terminal of the position search target from the position determination request and transmits it to the position measurement control unit 316. Further, the position information of the position search target terminal is transmitted as a position determination report from the response from the position positioning control unit 316.

  In response to a request from the position determination request / report transmission / reception unit 318, the position positioning control unit 316 cooperates with the position positioning control unit 314 and the position positioning unit 312 of the mobile terminal 302 to perform position positioning of the terminal that is the position search target. The position measurement result is returned to the position determination request / report transmission / reception unit 318.

  The portable terminal 314 includes a position positioning control unit 314 that performs position positioning by controlling the position positioning unit 312 in cooperation with the position positioning unit 312 and the position positioning control unit 316 of the wireless device 304.

  Next, the flow of processing in the approach detection method according to the present embodiment will be described with reference to FIGS.

  In FIG. 3, if the mobile terminals that perform the proximity detection are assumed to be A, B, and C, the user can store the mobile terminals A and B as information on the terminals that are the proximity detection targets in the proximity detection target terminal management unit 332 of the searcher side device 310. , C information is registered (402).

  The proximity detection target terminal management unit 332 of the searcher side device 310 is information on the proximity detection target terminal registered in the location information service transmission / reception unit 330 of the own device periodically (for example, every 5 minutes, 10 minutes, or 15 minutes). All of the information of the portable terminals A, B, and C is notified (404).

  When the location information service transmission / reception unit 330 of the searcher side device 310 receives the information of the mobile terminals A, B, and C as the information of the proximity detection target terminal from the proximity detection target terminal management unit 332, the location information service for the mobile terminal A is received. Information on the mobile terminals B and C is added to the request (LCS Service Request) and transmitted to the location information service transmission / reception unit 328 of the location information management device 308 (408).

  When the location information service transmission / reception unit 328 of the location information management device 308 receives the location information service request for the mobile terminal A to which the information on the mobile terminals B and C is given from the location information service transmission / reception unit 330 of the searcher side device 310, All the information of the mobile terminals A, B, and C is notified to the subscriber position transmission / reception unit 326 of the own apparatus as information on the terminal of the proximity detection target (410).

  When the subscriber location transmission / reception unit 326 of the location information management device 308 receives the information of the mobile terminals A, B, and C as the information on the terminal to be detected from the location information service transmission / reception unit 328, the subscriber location transmission / reception unit 326 receives from the subscriber terminal information storage unit 327. The position information of the portable terminal A is taken out. Then, the information on the mobile terminals B and C is additionally given to the subscriber position (Provide Subscriber Location) for the extracted mobile terminal A and transmitted to the subscriber position transmitting / receiving unit 324 of the exchange 306 (412).

  When the subscriber location transmission / reception unit 324 of the exchange 306 receives the subscriber location for the mobile terminal A to which the information on the mobile terminals B and C is given from the subscriber location transmission / reception unit 326 of the location information management device 308, All the information of the mobile terminals A, B, and C is notified to the service area search unit 322 as the information of the terminal of the proximity detection target (414).

  When the visited terminal search unit 322 of the exchange 306 receives the information of the mobile terminals A, B, and C as the information of the terminal that is the proximity detection target from the subscriber position transmission / reception unit 324, it searches the visited terminal information storage unit 321 and carries the mobile It is determined whether or not all terminals A, B, and C are located in the local exchange (415). If all are present, a normal response is returned to the subscriber position transmitting / receiving unit 324 (416). The flow in the case where all the mobile terminals A, B, and C are not located in the own switch will be described later with reference to FIG.

  When the subscriber location transmission / reception unit 324 of the exchange 306 receives a normal response from the located terminal search unit 322, the subscriber location transmission / reception unit 324 sends the location determination request / report transmission / reception unit 320 of its own device to the mobile terminals A and B as information on the proximity detection target terminal. , C are all notified (418).

  When the location determination request / report transmission / reception unit 320 of the exchange 306 receives the information on the mobile terminals A, B, and C as the information of the terminal that is the proximity detection target from the subscriber location transmission / reception unit 324, each of the mobile terminals A, B, and C (Position Request) is transmitted to the position determination request / report transmission / reception unit 318 of the wireless device 304 (420).

  When the position determination request / report transmission / reception unit 318 of the wireless device 304 receives the position determination request from the position determination request / report transmission / reception unit 320 of the exchange 306, the position determination target terminal information is transmitted to the position positioning control unit 316 of the own device. Notification is made (422).

  Next, referring to FIG. 4, when the position positioning control unit 316 of the wireless device 304 receives information of the mobile terminal that is the position search target from the position determination request / report transmission / reception unit 318, the position positioning control unit 314 of the mobile terminal 302. In cooperation with the position positioning unit 312, the position of the position search target terminal is determined (424). Then, the position measurement result is returned to the position determination request / report transmission / reception unit 318 of the own apparatus (426).

  When the position determination request / report transmission / reception unit 318 of the wireless device 304 receives the position information of the position search target terminal from the position positioning control unit 316, the position determination request / report transmission / reception unit of the exchange 306 as a position determination report (Location Report). Respond to 320 (428).

  When the position determination request / report transmission / reception unit 320 of the exchange 306 receives position determination reports for all the mobile terminals A, B, and C that are the proximity detection targets from the position determination request / report transmission / reception unit 318 of the wireless device 304, The location information of the mobile terminals A, B, and C is returned to the subscriber location transmission / reception unit 324 (430).

  When the subscriber location transmission / reception unit 324 of the exchange 306 receives the location information of the mobile terminals A, B, and C to be detected from the location determination request / report transmission / reception unit 320, the subscriber location transmission / reception unit 324 acknowledges the subscriber location to the mobile terminal A (Provide). The location information of the mobile terminal A is included in the Subscriber Location ack), and the location information of the mobile terminals B and C is added to respond to the subscriber location transmission / reception unit 326 of the location information management device 308 (432).

  When the subscriber location transmission / reception unit 326 of the location information management device 308 receives the acknowledgment of the subscriber location for the mobile terminal A to which the information on the mobile terminals B and C is given from the subscriber location transmission / reception unit 324 of the exchange 306, the subscriber location transmission / reception unit 326 approaches The position information of the mobile terminals A, B, and C to be detected is returned to the position information service transmission / reception unit 328 (434).

  When the location information service transmission / reception unit 328 of the location information management device 308 receives the location information of the mobile terminals A, B, and C targeted for proximity detection from the subscriber location transmission / reception unit 326, the location information service report (LCS Service) for the mobile terminal A is received. Report) is additionally provided with the location information of the portable terminals B and C, and responds to the location information service transmission / reception unit 330 of the searcher side device 310 (436).

  When the location information service transmission / reception unit 330 of the searcher side device 310 receives the location information service report for the mobile terminal A to which the location information of the mobile terminals B and C is given from the location information service transmission / reception unit 328 of the location information management device 308. Then, the position information of the mobile terminals A, B, and C that are proximity detection targets is returned to the proximity detection target terminal management unit 332 (438).

  The proximity detection target terminal management unit 332 of the searcher side device 310 confirms the approach state from the location information of the proximity detection target mobile terminals A, B, and C received from the location information service transmission / reception unit 330 (440). If the distance between the mobile terminals A, B, and C is within a certain distance, the user is notified of proximity detection by ringing or image output (442).

  FIG. 5 is a sequence diagram showing a flow of processing in the approach detection method according to another embodiment of the present invention.

  The flow indicated by reference numerals 502 to 514 is the same as the flow indicated by reference numerals 402 to 414 in FIG.

  In the visited terminal search unit 322 of the exchange 306, it is searched whether all the mobile terminals A, B, and C are located under the own exchange (515). If all of them are not located, the located terminal search unit 322 returns an abnormal response to the subscriber location transmission / reception unit 324 of its own device (516).

  When the subscriber location transmission / reception unit 324 of the exchange 306 receives an abnormal response from the serving terminal search unit 322, the subscriber location transmission / reception unit 324 includes an NG response indicating that the terminal is not approaching in the acknowledgment of the subscriber location with respect to the mobile terminal A, and manages location information The data is transmitted to the subscriber position transmission / reception unit 326 of the device 308 (518).

  When the subscriber location transmission / reception unit 326 of the location information management device 308 receives an acknowledgment of the subscriber location indicating that the terminal is not approaching from the subscriber location transmission / reception unit 324 of the exchange 308, the subscriber location transmission / reception unit 326 sends it to the location information service transmission / reception unit 328 of its own device. An inaccessibility response is transmitted (520).

  When the location information service transmission / reception unit 328 of the location information management device 308 receives an inaccessibility response from the subscriber location transmission / reception unit 326, the location information service transmission / reception unit 328 includes an NG response indicating that the terminal is not in the location information service response to the mobile terminal A The information is transmitted to the location information service transmission / reception unit 330 of the person side device 310 (522).

  When the location information service transmission / reception unit 330 of the searcher side device 310 receives a location information service response indicating that the terminal is not approaching from the location information service transmission / reception unit 328 of the location information management device 308, the location information service transmission / reception unit 330 An approach response is transmitted (524).

  When the proximity detection target management unit 332 of the searcher side device 310 receives an inaccessibility response from the location information service transmission / reception unit 330, the proximity detection target management unit 332 determines that the proximity detection target terminals are not approaching, and the terminal is not connected by ringing or image output. Notify user of approach. And it prepares for the next approach state confirmation request | requirement implemented regularly (526).

  Various modifications other than those described above are possible. However, as long as it is based on the technical idea described in the claims, the modifications are within the technical scope of the present invention.

It is a sequence diagram of 3GPP and OMA standard portable terminal location information search method (3GPP TS23.271 MT-LR) in a mobile network. It is a block diagram which shows the structural example of the mobile communication system which concerns on one Embodiment of this invention. It is a sequence diagram which shows the flow of the approach detection at the time of the approach detection which concerns on one Embodiment of this invention. It is a sequence diagram which shows the flow of the approach detection at the time of the approach detection which concerns on one Embodiment of this invention. It is a sequence diagram which shows the flow of the approach detection at the time of the non-access determination based on one Embodiment of this invention.

Explanation of symbols

302 mobile terminal 304 wireless device 306 exchange 308 location information management device 310 searcher side device 312 location positioning unit 314, 316 location positioning control unit 318, 320 location determination request / report transmission / reception unit 322 area terminal search unit 324, 326 subscriber Location sending / receiving unit 328, 330 Location information service sending / receiving unit 332 Access detection target terminal management unit

Claims (7)

A terminal proximity detection method in a mobile communication system including a terminal search device, a location information management device, an exchange, and a wireless device,
The search device retains information on a terminal that is a proximity detection target, and sends information on all other proximity detection target terminals to a location information service request that includes information on a specific location search target terminal. Steps,
When the location information management device acquires information on all other proximity detection target terminals in addition to the specific location search target terminal, from the subscriber terminal information storage unit that registered the location information of the subscriber's terminal Extracting the location information of the specific location search target terminal, adding the information of all other proximity detection target terminals to the extracted location information, and transmitting,
When the exchange obtains the position information, it searches the located terminal information storage unit in which the position information of the located terminal is registered, and in addition to the specific position search target terminal, all other proximity detection targets If all of the proximity detection target terminals are in the service area, in addition to the specific location search target terminal, each of all other proximity detection target terminals is determined. Sending a positioning request for
When the wireless device acquires the position determination request, the position measurement is performed in cooperation with a plurality of terminals, and the result of the position positioning is reported;
Wherein the exchange includes the step of acquiring the position information of all the proximity detection target terminals from the received result of the position measurement and responding to the position information management device. Approach detection method.   In the step of responding to the search device, as a result of searching whether or not all the other proximity detection target terminals are in the service area, the exchange determines that at least one terminal is in the service area. The terminal proximity detection method in the mobile communication system according to claim 1, wherein a response indicating that the proximity detection target terminal is not approaching is transmitted if the terminal is not located. A terminal search device that holds information about a terminal that is a proximity detection target, and that adds information about all other proximity detection target terminals to a location information service request that includes information about a specific location search target terminal; and ,
A subscriber terminal information storage unit in which the location information of the subscriber's terminal is registered, and in addition to the specific location search target terminal, when acquiring information of all other proximity detection target terminals, the subscriber terminal A position information management device that extracts the position information of the specific position search target terminal from the information storage unit, adds the information of all other proximity detection target terminals to the extracted position information, and transmits the position information;
Having a located terminal information storage unit that registers the location information of a terminal that is in the area, and acquiring the location information, searching the located terminal information storage unit, in addition to the specific location search target terminal, It is determined whether all other proximity detection target terminals are in the service area. If all the proximity detection target terminals are in the service area, in addition to the specific position search target terminal, An exchange that sends a position determination request to each of the terminals that are subject to proximity detection;
When the position determination request is acquired, the wireless communication device performs position positioning in cooperation with a plurality of terminals, and reports the position positioning result. A mobile communication system characterized in that it acquires position information of an approach detection target terminal and responds to the position information management device.   The exchange determines whether or not all the proximity detection target terminals are located in addition to the specific location search target terminal, and if the at least one terminal is not located, The mobile communication system according to claim 3, wherein a response indicating that the terminal to be detected is not approaching is transmitted. A terminal management unit for holding information on the terminal of the proximity detection target, and transmitting the information on the terminal of the proximity detection target held;
A location information service request including information on a specific location search target terminal is added with information on all other proximity detection target terminals acquired from the terminal management unit and transmitted to the location information management device, and the location In addition to the location information of the location search target terminal from the response received from the information management device, the location information of all other proximity detection target terminals is acquired, and the transmission / reception unit responds to the terminal management unit. This is a terminal search device. A subscriber terminal information storage unit that registers the location information of the subscriber's terminal;
When receiving a location information service request, a first transmission / reception unit that transmits information on a specific location search target terminal included in the location information service request and information on other proximity detection target terminals;
When the information of all other proximity detection target terminals is acquired from the first transmission / reception unit in addition to the specific location search target terminal, the specific location search target terminal from the subscriber terminal information storage unit The position information is taken out, the information on all other proximity detection target terminals is added to the taken out position information and transmitted to the exchange, and the specific position is obtained from the subscriber position information received from the exchange. In addition to the search target terminal, a second transmission / reception unit that acquires position information or information on an inaccessible state of all other proximity detection target terminals and responds to the first transmission / reception unit is provided. Location information management device. A location information storage unit that registers location information of the location terminal,
A first transmission / reception unit for acquiring information to which information of all other proximity detection target terminals is added in addition to a specific position search target terminal;
Whether or not all other proximity detection target terminals are located in addition to the specific position search target terminal obtained by searching the located terminal information storage unit and acquired by the first transmission / reception unit. And if all the proximity detection target terminals are located, the located terminal search unit that normally responds to the first transmission / reception unit;
In addition to the specific location search target terminal from the first transmission / reception unit that has received the normal response, when receiving information on all other proximity detection target terminals, the information is added to the specific location search target terminal. , Transmitting a position determination request for each of all other proximity detection target terminals to the wireless device, acquiring location information of all the proximity detection target terminals from the wireless device, and responding to the first transmission / reception unit And a second transmission / reception unit.

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