JP2016032262A - Positioning support system and positioning support method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preferentially process a positioning request from an external client during congestion at a positional information providing device.SOLUTION: A positioning support system 2 relays a call to an SLP 50 and has the SLP 50 obtain positional information on a mobile communication terminal 60 in response to a positioning request from an LCS client 10. The positioning support system 2 comprises: a subscriber information acquisition unit 21 for acquiring identification information on the mobile communication terminal 60 that is a positioning object on the basis of the positioning request from the LCS client 10; a priority call storage unit 44 for storing the identification information; a congestion monitoring unit 42 for finding out whether the SLP 50 is in a congestion state or not; and a priority control unit 45 that, in response to finding out that the SLP 50 is in the congestion state, makes calls objects for priority processing, the transmission source of the calls being the mobile communication terminal 60 identified from the identification information stored in the priority call storage unit 44 among calls to the SLP 50.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a positioning support system and a positioning support method.

  A system is known in which a position information providing device executes a positioning request based on a positioning request of a mobile communication terminal by an external client and notifies the external client of the position information of the mobile communication terminal (for example, see Patent Document 1). .

JP-T-2004-512788

  In such a system, when the position information providing apparatus becomes congested, the position information providing apparatus may refuse to accept all new calls. For this reason, the positioning request by the external client and the call generated due to the positioning request are rejected until the congestion is resolved. As a result, notification of position information may be delayed in response to a positioning request from an external client. In particular, when the external client is an emergency call receiving organization such as a police station or a fire department, it is desired that the notification of position information to the external client is surely performed.

  The present invention has been made in view of the above problems, and provides a positioning support system and a positioning support method capable of preferentially processing a positioning request from an external client when the location information providing apparatus is congested. The purpose is to do.

  A positioning support system according to one aspect of the present invention relays a call to a location information providing device and causes the location information providing device to acquire location information of a mobile communication terminal in response to a positioning request from a positioning request source. System. The positioning support system receives a positioning request from a positioning request source and acquires identification information of a mobile communication terminal that is a positioning target of the positioning request based on the positioning request, and an identification information acquiring unit. The priority call storage means for storing the identified identification information, the monitoring means for detecting whether or not the position information providing apparatus is in a congested state, and the monitoring means detecting that the position information providing apparatus is in the congested state And a priority control means for determining a call for priority processing among calls to the location information providing apparatus. The priority control means is a mobile communication terminal that determines whether or not the call source is a mobile communication terminal identified by the identification information stored in the priority call storage means, and the source is identified by the identification information If it is discriminated, the call is subjected to priority processing.

  According to this positioning support system, in response to detecting that the position information providing device is in a congested state, a call source of a call to the position information providing device is a positioning target of a positioning request from a positioning request source. The call, which is the mobile communication terminal, becomes the target of priority processing. Thereby, even when the position information providing apparatus is in a congested state, a call from the mobile communication terminal to the position information providing apparatus generated by the positioning request from the positioning request source is preferentially processed. As a result, when the location information providing apparatus is congested, it is possible to preferentially process a call resulting from a positioning request from a positioning request source, and to preferentially process a positioning request from an external client. . The call priority process means that a call is received and processed preferentially when the position information providing apparatus is in a congested state.

  The priority control means may further determine whether the call is a target of priority processing according to the type of call. Further, the priority control means sets the call as a target for priority processing when the call is SUPL-MT, and the identification information stored in the priority call storage means when the call is SUPL-MO. A call that is a mobile communication terminal identified by (1) may be a target of priority processing, and a call that is not a mobile communication terminal identified by identification information may be a target of congestion control. In this case, even if the location information providing device is in a congested state, the SUPL-MT call and the SUPL-MO call from the mobile communication terminal to the location information providing device generated by the positioning request from the positioning request source are processed with priority. The As a result, when the location information providing device is congested, the positioning request from the positioning request source and the call resulting from the positioning request from the positioning request source can be processed with priority, and the positioning request from the external client is further prioritized. Can be processed.

  The priority call storage means may store time information indicating the time when the call is received in association with the identification information acquired by the identification information acquisition means. The priority control means is stored in the priority call storage means. Whether identification information after a predetermined time is extracted from the identification information stored in the priority call storage means based on the time information, and the call originator is a mobile communication terminal identified by the extracted identification information It may be determined. In the third-party positioning, a call resulting from the positioning request is generated within a certain period of time after the positioning request from the positioning request source is received. For this reason, by using the identification information after a predetermined time among the identification information stored in the priority call storage means, the mobile communication terminal that is generated regardless of the positioning request from the positioning request source to the position information providing device. The possibility that a call is preferentially processed can be reduced.

  A positioning support system according to another aspect of the present invention stores a priority information management unit that stores a priority management table in which a positioning request source and priority information indicating a priority are associated with each other, and stores the priority management table in the priority information management unit. And priority information acquisition means for acquiring priority information of the positioning request source based on the priority management table. The priority call storage means further stores priority information acquired by the priority information acquisition means in association with the identification information acquired by the identification information acquisition means, and the priority control means further stores the priority call storage means in the priority call storage means. A call for priority processing may be determined in accordance with priority information associated with stored identification information. In this case, when the position information providing device is congested, the positioning request from the positioning request source can be preferentially processed according to the priority of the positioning request source. For example, when the positioning request source is an emergency call receiving organization, the positioning request from the emergency call receiving organization can be processed with higher priority by setting the priority of the positioning request source high.

  The positioning support system according to still another aspect of the present invention may further include an encryption processing unit that determines whether or not the call is concealed, and in the case where the call is concealed. In this case, it is possible to discriminate the call type and the call source by leveling the concealed call. For this reason, when the position information providing apparatus is in a congested state, it is possible to determine whether or not to perform priority processing for a concealed call.

  By the way, the present invention can be described as the invention of the positioning support system as described above, and can also be described as the invention of the positioning support method as follows. This is substantially the same invention only in different categories, and has the same operations and effects.

  That is, the positioning support method according to one aspect of the present invention relays a call to a location information providing device and causes the location information providing device to acquire location information of the mobile communication terminal in response to a positioning request from a positioning request source. This is a positioning support method performed by the positioning support system. This positioning support method receives a positioning request from a positioning request source, acquires identification information of a mobile communication terminal that is a positioning target of the positioning request based on the positioning request, and acquired in an identification information acquisition step A priority call storing step for storing the identified identification information, a monitoring step for detecting whether or not the location information providing device is in a congested state, and that the location information providing device is detected to be in a congested state in the monitoring step. And a priority control step for determining a call for priority processing among calls to the location information providing apparatus. In the priority control step, it is determined whether or not the call source is a mobile communication terminal identified by the identification information stored in the priority call storage step, and the call source is a mobile communication terminal identified by the identification information If it is discriminated, the call is subjected to priority processing.

  According to the present invention, it is possible to preferentially process a positioning request from an external client when the location information server is congested.

It is a figure which shows roughly the structure of the positioning system containing the positioning assistance system which concerns on 1st Embodiment. It is a hardware block diagram of GW, HLR, and LB contained in the positioning assistance system of FIG. It is a figure which shows an example of the subscriber information stored in subscriber information DB of FIG. (A) is a figure which shows an example of the priority call management table with which the priority call memory | storage part of FIG. 1 is provided, (b) is a figure which shows the other example of the priority call management table with which the priority call memory | storage part of FIG. It is a flowchart which shows the process performed by LB of FIG. 6 is a flowchart specifically showing priority control in FIG. 5. It is a sequence diagram which shows the process of the third party positioning performed by the positioning system of FIG. It is a figure which shows roughly the structure of the positioning system containing the positioning assistance system which concerns on 2nd Embodiment. It is a figure which shows an example of the priority management table stored in the priority management DB of FIG. (A) is a figure which shows an example of the priority call management table with which the priority call memory | storage part of FIG. 8 is provided, (b) is a figure which shows the other example of the priority call management table with which the priority call memory | storage part of FIG. 8 is provided. It is a flowchart which shows the process performed by LB of FIG. 12 is a flowchart specifically illustrating priority control of FIG. 11. It is a sequence diagram which shows the process of the third party positioning performed by the positioning system of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same reference numerals are used for the same or equivalent elements, and redundant descriptions are omitted.

[First Embodiment]
FIG. 1 is a diagram schematically showing a configuration of a positioning system including a positioning support system according to the first embodiment. As shown in FIG. 1, the positioning system 1 includes an LCS (LoCation Service) client 10, a GW (gateway) 20, an HLR (Home Location Register) 30, an LB (load balancer) 40, an SLP (SUPL Location). Platform) 50 and a mobile communication terminal 60. Among these, the positioning support system 2 configured by the GW 20, the HLR 30, and the LB 40 relays a call to the SLP 50 and causes the SLP 50 to acquire position information of the mobile communication terminal 60 in response to a positioning request from the LCS client 10. This is a positioning support system. That is, the positioning support system 2 relays communication between the LCS client 10 and the SLP 50 and communication between the SLP 50 and the mobile communication terminal 60. Communication between the devices is performed using a SUPL-MT (Secure User Plane Location-Mobile Terminated) call (communication) or a SUPL-MO (Secure User Plane Location-Mobile Originated) call (communication). In the following description, “communication” may be expressed as “call”.

  The LCS client 10 is a third-party positioning server and is a positioning request source that requests the SLP 50 for positioning of the mobile communication terminal 60. The LCS client 10 is a third party (external client) other than the mobile communication terminal 60 of the search target person who is a positioning target. For example, the LCS client 10 is an emergency call receiving organization such as a police or a fire department. May be. The LCS client 10 transmits a positioning request specifying the MSISDN (Mobile Subscriber ISDN Number: telephone number) of the mobile communication terminal 60 to be positioned to the positioning support system 2. This positioning request is made using a SUPL-MT call.

  The SLP 50 is a server that terminates a signal with the mobile communication terminal 60 and is a position information providing device that provides position information of the mobile communication terminal 60 in response to a positioning request from the LCS client 10. The SLP 50 is composed of a plurality of SLPs. The SLP 50 receives the positioning request from the LCS client 10 via the positioning support system 2 and transmits the positioning request to the mobile communication terminal 60 identified by the MSISDN specified in the positioning request. This positioning request is made using a SUPL-MT call. The SLP 50 stores assist data to be transmitted to the mobile communication terminal 60, and transmits assist data to the mobile communication terminal 60 in response to a request from the mobile communication terminal 60. The notification of the assist data is performed using a SUPL-MO call. In addition, when receiving the positioning result from the mobile communication terminal 60, the SLP 50 transmits the positioning result to the GW 20 using the SUPL-MT call.

  The mobile communication terminal 60 is a device used by a user and having a communication function. The mobile communication terminal 60 is, for example, a mobile phone such as a smartphone, a tablet terminal, a notebook PC, or the like. The mobile communication terminal 60 is capable of SUPL communication and has a function of performing GPS (Global Positioning System) positioning using assist data from the SLP 50. For example, in a positioning request from a third party, when receiving a positioning request from the SLP 50, the mobile communication terminal 60 requests assistance data from the SLP 50 using a SUPL-MO call. In addition, the mobile communication terminal 60 requests assist data from the SLP 50 using a SUPL-MO call according to a user operation or the like.

  When receiving the assist data from the SLP 50, the mobile communication terminal 60 performs GPS positioning using the assist data, and transmits the positioning result to the SLP 50 using a SUPL-MT call. Note that communication between the mobile communication terminal 60 and the SLP 50 may be concealed (encrypted) by, for example, TLS (Transport Layer Security). Also, the mobile communication terminal 60 sets the IMSI (International Mobile Subscriber Identity) or MSISDN of the mobile communication terminal 60 as a signal of the SUPL-MO call according to the type.

  The GW 20 is a gateway with the LCS client 10 and receives a positioning request from the LCS client 10. Functionally, the GW 20 includes a subscriber information acquisition unit 21 and a signal processing unit 22. The HLR 30 is a device that manages subscriber information. Functionally, the HLR 30 includes a subscriber information DB 31. The LB 40 is a device that relays communication between the GW 20 and the SLP 50 and communication between the SLP 50 and the mobile communication terminal 60, and is a load balancer that distributes a load on a signal for the SLP 50 to a plurality of SLPs. That is, the LB 40 load-distributes the signal from the mobile communication terminal 60 to the SLP 50 and the signal from the GW 20 to the SLP 50 and transmits the load to one of the plurality of SLPs. The LB 40 functionally includes an encryption processing unit 41, a congestion monitoring unit 42, a signal determination unit 43, a priority call storage unit 44, and a priority control unit 45. These GW20, HLR30, and LB40 are comprised by the hardware shown by FIG.

  FIG. 2 is a hardware configuration diagram of the GW 20, the HLR 30, and the LB 40 included in the positioning support system 2. As shown in FIG. 2, the GW 20, the HLR 30, and the LB 40 physically communicate with a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) as a main storage device, and a ROM 103 (Read Only Memory). And a communication module 104 and a computer including hardware such as an auxiliary storage device 105 such as a hard disk. The function of each device is exhibited by the operation of these components.

  Returning to FIG. 1, the functional configuration of the GW 20, the HLR 30, and the LB 40 included in the positioning support system 2 will be described in detail. The subscriber information DB 31 manages MSISDN and IMSI in association with each other. FIG. 3 is a diagram illustrating an example of subscriber information stored in the subscriber information DB. Both MSISDN and IMSI are identification information that can identify the mobile communication terminal 60. In this example, MSISDN “XXX” is associated with IMSI “xxx”. That is, the IMSI of the mobile communication terminal 60 identified by MSISDN “XXX” is “xxx”.

  The subscriber information acquisition unit 21 functions as an identification information acquisition unit that receives a positioning request from the LCS client 10 and acquires identification information of the mobile communication terminal 60 that is a positioning target of the positioning request based on the positioning request. Specifically, the subscriber information acquisition unit 21 acquires the IMSI associated with the MSISDN specified in the positioning request from the HLR 30 in response to the positioning request from the LCS client 10. This acquisition of IMSI is performed using a SUPL-MT call. The signal processing unit 22 inserts the MSISDN and the IMSI acquired by the subscriber information acquisition unit 21 into the positioning request as parameters indicating the identification information (key information) of the mobile communication terminal 60. The signal processing unit 22 transmits the positioning request with the parameter inserted to the SLP 50 via the LB 40 using the SUPL-MT call. In addition, the signal processing unit 22 transmits the positioning result received from the SLP 50 to the LCS client 10 that is the positioning request source using the SUPL-MT call.

  The encryption processing unit 41 functions as encryption processing means that determines whether or not the received call (signal) is concealed (encrypted) and, if concealed, clears (decrypts). Since communication (SUPL-MT call, SUPL-MO call) from the mobile communication terminal 60 to the SLP 50 may be concealed by, for example, TLS, it is necessary to make a clear call to determine the call type. As described above, when the signal from the mobile communication terminal 60 to the SLP 50 is concealed, the encryption processing unit 41 plainly conceals the concealed signal and transmits the concealed signal to the SLP 50. That is, the TLS is terminated at the LB 40 that is a network device upstream of the SLP 50. In addition, when receiving a signal from the SLP 50 to the mobile communication terminal 60, the encryption processing unit 41 conceals with TLS, and transmits the concealed signal to the mobile communication terminal 60. In this way, communication between the LB 40 and the mobile communication terminal 60 is concealed.

  The congestion monitoring unit 42 functions as a monitoring unit that detects whether or not the SLP 50 is in a congestion state. The congestion monitoring unit 42 monitors, for example, traffic to the SLP 50, and detects that the SLP 50 is in a congestion state when the traffic is equal to or greater than a predetermined threshold T1.

  The signal discriminating unit 43 functions as a signal discriminating unit that discriminates the type of call received by the LB 40, the source and destination of the signal, the type of signal, and the like. For example, the signal determination unit 43 determines whether the call is a SUPL-MT call or a SUPL-MO call from a predetermined parameter included in the received signal. Further, the signal discriminating unit 43 discriminates the source and destination of the signal from the IP address included in the received signal, and whether it is a signal to the SLP 50 (up) or a signal from the SLP 50 (down) Is determined. In addition, the signal determination unit 43 determines the type of signal such as a positioning request and a positioning result from predetermined parameters included in the received signal.

  The priority call storage unit 44 is a part for registering the mobile communication terminal 60 to be subjected to priority processing, and functions as a priority call storage unit that stores the identification information acquired by the subscriber information acquisition unit 21. More specifically, the priority call storage unit 44 uses the IMSI as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20 to the SLP 50. get. And the priority call memory | storage part 44 matches and associates IMSI and the time information which shows the time which received the signal, and stores it in a priority call management table. FIG. 4A is a diagram illustrating an example of a priority call management table provided in the priority call storage unit 44.

  Also, the priority call storage unit 44 acquires MSISDN as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20 to the SLP 50, and MSISDN And the time information indicating the time when the signal is received are associated with each other and stored in the priority call management table. FIG. 4B is a diagram illustrating another example of the priority call management table provided in the priority call storage unit 44. Further, the priority call storage unit 44 acquires IMSI and MSISDN as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20 to the SLP 50. IMSI, MSISDN, and time information indicating the time when the signal is received may be associated with each other and stored in the priority call management table.

  The priority control unit 45 functions as a priority control unit that determines a call for performing priority processing among calls to the SLP 50 when the congestion monitoring unit 42 detects that the SLP 50 is in a congestion state. For example, the priority control unit 45 determines whether or not a call is a target of priority processing according to the type of the call. Specifically, when the call is a SUPL-MT call, the priority control unit 45 sets the call as a target of priority processing. On the other hand, when the call is a SUPL-MO call, the priority control unit 45 further uses the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44. It is determined whether or not there is.

  Depending on the type of mobile communication terminal 60, the IMSI may be set in the signal and the MSISDN may be set. Therefore, when the priority control unit 45 acquires the IMSI as the source identification information, When the MSISDN is acquired as the caller identification information with reference to the priority call management table shown in FIG. 4A, the priority call management table shown in FIG. Then, the priority control unit 45 sets a call whose mobile communication terminal 60 is identified by the identification information stored in the priority call management table of the priority call storage unit 44 as a target of priority processing, and the call source is a priority call. Calls other than the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the storage unit 44 are targeted for congestion control. That is, when the caller identification information is stored in the priority call management table of the priority call storage unit 44, the priority control unit 45 sets the call as a target of priority processing, and the caller identification information is stored in the priority call storage. If the call is not stored in the priority call management table of the unit 44, the call is subject to congestion control.

  The call priority process means that a call is accepted and processed preferentially when the SLP 50 is in a congested state. That is, the priority control unit 45 distributes the load determined as the target of priority processing and transmits it to one of the plurality of SLPs. On the other hand, call congestion control means that call acceptance is rejected when the SLP 50 is in a congestion state. Further, the priority control unit 45 transfers the downlink call (from the SLP 50 to the mobile communication terminal 60) as it is without determining whether or not the call is a target of priority processing.

  Based on the time information stored in the priority call management table of the priority call storage unit 44, the priority control unit 45 performs identification after a predetermined time among the identification information stored in the priority call management table of the priority call storage unit 44. Information may be extracted, and it may be determined whether or not the call source is the mobile communication terminal 60 identified by the extracted identification information. That is, in the third-party positioning, it is considered that a SUPL-MO call resulting from the positioning request is generated within a certain period of time after receiving the positioning request from the GW 20 to the SLP 50. For this reason, when the call is a SUPL-MO call, the priority control unit 45 sets the priority call storage unit 44 after a time that is back by a predetermined time (for example, 3 minutes) from the time when the call is received. The identification information stored in the priority call management table may be extracted. Then, the priority control unit 45 treats the call, which is the mobile communication terminal 60 identified by the identification information from which the call source is extracted, as the target of priority processing, and is identified by the identification information from which the call source is extracted. Calls that are not mobile communication terminals 60 may be subject to congestion control.

  Next, with reference to FIG. 5 and FIG. 6, processing executed by the LB 40 for uplink communication will be described. FIG. 5 is a flowchart showing processing executed by the LB 40. FIG. 6 is a flowchart specifically showing the priority control of FIG. The process shown in FIG. 5 is started when the LB 40 receives a call for the SLP 50.

  First, the encryption processing unit 41 determines whether or not the call received by the LB 40 is concealed (encrypted) (step S01). In step S01, when it is determined that the call is concealed (step S01; Yes), the cryptographic processing unit 41 plainly (decrypts) the call (step S02). Then, the signal determination unit 43 determines whether or not the signal is a positioning request from the GW 20 to the SLP 50 based on the IP address and predetermined parameters included in the signal (step S03). On the other hand, when it is determined in step S01 that the call is not concealed (step S01; No), the process proceeds to step S03 as it is.

  In step S03, when it is determined that the signal is a positioning request from the GW 20 to the SLP 50 (step S03; Yes), the priority call storage unit 44 obtains the IMSI and MSISDN from the signal and indicates the time when the signal is received. The information is stored in the priority call management table in association with the indicated time information (step S04: identification information acquisition step, priority call storage step). Then, the congestion monitoring unit 42 determines whether or not the SLP 50 is in a congestion state (step S05: monitoring step). On the other hand, if it is determined in step S03 that the signal is not a positioning request from the GW 20 to the SLP 50 (that is, a positioning result from the mobile communication terminal 60 to the SLP 50) (step S03; No), the process directly proceeds to step S05.

  If it is determined in step S05 that the SLP 50 is not in a congested state (step S05; No), the priority control unit 45 accepts the call, performs normal processing (transfer processing) (step S06), and ends the processing of LB40. . On the other hand, if it is determined in step S05 that the SLP 50 is in a congested state (step S05; Yes), the priority control unit 45 performs priority control for determining a call for priority processing among calls to the SLP 50 (step S07). : Priority control step).

  Next, details of the priority control in step S07 will be described with reference to FIG. First, the signal determination unit 43 determines whether or not the call is a SUPL-MT call (step S11). When it is determined in step S11 that the call is a SUPL-MT call (step S11; Yes), the priority control unit 45 sets the call as a target for priority processing, and distributes the call to one of a plurality of SLPs. (Step S12), and the processing of LB40 is terminated.

  When it is determined in step S11 that the call is not a SUPL-MT call (that is, a SUPL-MO call) (step S11; No), the priority control unit 45 identifies the source mobile communication terminal 60 from the signal. A possible IMSI or MSISDN is acquired, and it is determined whether or not the acquired IMSI or MSISDN is in the priority call management table of the priority call storage unit 44 (step S13).

  If it is determined in step S13 that the IMSI or MSISDN included in the signal is in the priority call management table of the priority call storage unit 44 (step S13; Yes), the priority control unit 45 sets the call as a target of priority processing. The load is distributed and transmitted to one of the plurality of SLPs (step S12), and the processing of the LB 40 is terminated. On the other hand, if it is determined in step S13 that the IMSI or MSISDN included in the signal is not in the priority call management table of the priority call storage unit 44 (step S13; No), the priority control unit 45 performs congestion control on the call. The call is rejected (step S14), and the processing of the LB 40 is terminated.

  In this way, the LB 40 preferentially processes the SUPL-MT call and the SUPL-MO call that is the mobile communication terminal 60 whose source is identified by the identification information stored in the priority call management table of the priority call storage unit 44. The SUPL-MO call that is not the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44 is the target of congestion control.

  Next, with reference to FIG. 7, the positioning assistance method which is a process performed with the positioning assistance system 2 is demonstrated. FIG. 7 is a flowchart showing a third-party positioning process executed by the positioning system 1.

  First, the LCS client 10 transmits a positioning request specifying the MSISDN of the mobile communication terminal 60 of the search target person who is the positioning target to the GW 20 using the SUPL-MT call (step S21). And the subscriber information acquisition part 21 of GW20 will acquire the identification information of the mobile communication terminal 60 based on a positioning request | requirement, if the positioning request | requirement is received from the LCS client 10 (step S22: identification information acquisition step). Specifically, the subscriber information acquisition unit 21 acquires MSISDN from the positioning request, and acquires the IMSI associated with the MSISDN from the subscriber information DB 31 of the HLR 30 using the acquired MSISDN as a key. Then, the signal processing unit 22 of the GW 20 transmits a positioning request including the acquired MSISDN and the IMSI acquired from the subscriber information DB 31 to the SLP 50 via the LB 40 by a SUPL-MT call (step S23).

  Subsequently, when receiving the positioning request from the GW 20 to the SLP 50, the priority call storage unit 44 of the LB 40 stores the identification information acquired in step S22 in the priority call management table (step S24: priority call storage step). Specifically, the priority call storage unit 44 extracts IMSI and MSISDN included in the positioning request, and stores them in the priority call management table in association with time information indicating the time when the positioning request is received. Then, the priority control unit 45 of the LB 40 performs a load balancing process and transmits a positioning request to the SLP 50 (step S25). Here, even when the congestion monitoring unit 42 of the LB 40 detects the congestion state of the SLP 50, the positioning request from the GW 20 to the SLP 50 is made by the SUPL-MT call. Sent.

  Subsequently, when receiving a positioning request from the GW 20, the SLP 50 transmits a positioning request to the mobile communication terminal 60 identified by the IMSI or MSISDN included in the positioning request by a SUPL-MT call (step S26). This positioning request is transmitted to the mobile communication terminal 60 by control SMS (Short Message Service) without going through the LB 40. When receiving a positioning request from the SLP 50, the mobile communication terminal 60 acquires assist data from the SLP 50 using a SUPL-MO call with the SLP 50 (step S27).

  This SUPL-MO call is concealed by the TLS between the mobile communication terminal 60 and the LB 40. That is, the mobile communication terminal 60 transmits a concealed signal to the SLP 50, the cipher processing unit 41 of the LB 40 flattenes the signal, and the priority control unit 45 of the LB 40 performs a load balancing process to perform the plain balancing. The transmitted signal is transmitted to the SLP 50. On the other hand, the SLP 50 transmits a signal that is not concealed to the mobile communication terminal 60, the cipher processing unit 41 of the LB 40 conceals the signal, and the priority control unit 45 of the LB 40 moves the concealed signal. It transmits to the communication terminal 60. Here, the SUPL-MO call from the mobile communication terminal 60 to the SLP 50 is caused by a positioning request from the LCS client 10. For this reason, since this SUPL-MO call has the identification information of the mobile communication terminal 60 stored in the priority call management table in step S24 even when the congestion monitoring unit 42 of the LB 40 detects the congestion state of the SLP 50. And sent to the SLP 50 without being rejected.

  Subsequently, the mobile communication terminal 60 performs GPS positioning using the assist data (step S28). And the mobile communication terminal 60 transmits a positioning result to SLP50 via LB40 using a SUPL-MT call (step S29). This SUPL-MT call is concealed by the TLS between the mobile communication terminal 60 and the LB 40. That is, the mobile communication terminal 60 transmits a concealed signal to the SLP 50, and the LB 40 transmits the signal to the SLP 50 by performing the load balancing process and performing the load balancing process. Here, even when the congestion monitoring unit 42 of the LB 40 detects the congestion state of the SLP 50, since the positioning result from the mobile communication terminal 60 to the SLP 50 is performed by the SUPL-MT call, it is not rejected. , Sent to the SLP 50.

  Then, SLP50 transmits a positioning result to GW20 using a SUPL-MT call (Step S30). This positioning result is transmitted to the GW 20 without going through the LB 40. When the GW 20 receives the positioning result from the SLP 50, the GW 20 transmits the positioning result to the LCS client 10 that is the positioning request source using the SUPL-MT call (step S31), and the series of third party positioning processing is completed. The

  By the way, the SUPL-MO call from the mobile communication terminal 60 to the SLP 50 includes a normal SUPL-MO call that is not caused by a positioning request from the LCS client 10 and is generated by a user positioning operation or the like. . In this normal SUPL-MO call, the identification information of the source mobile communication terminal 60 is not stored in the priority call management table. Therefore, when the congestion monitoring unit 42 of the LB 40 detects the congestion state of the SLP 50. , The priority control unit 45 of the LB 40 is subject to congestion control and is rejected.

  Next, the effects of the positioning support system 2 and the positioning support method performed by the positioning support system 2 will be described. In the positioning support system 2 and the positioning support method performed by the positioning support system 2, the subscriber information acquisition unit 21 of the GW 20 acquires the identification information of the mobile communication terminal 60 that is the positioning target of the positioning request from the LCS client 10, and the LB 40 The priority call storage unit 44 stores the acquired identification information, and the congestion monitoring unit 42 of the LB 40 detects whether or not the SLP 50 is in a congestion state. Then, in response to detecting that the SLP 50 is in a congested state, the priority control unit 45 of the LB 40 sets the call as a target of priority processing when the call is the SUPL-MT among the calls to the SLP 50. On the other hand, if the call is a SUPL-MO, the call is the mobile communication terminal 60 identified by the identification information stored in the priority call storage unit 44, and the call is made subject to priority processing. A call that is not the mobile communication terminal 60 identified by the identification information stored in the priority call storage unit 44 is a target of congestion control.

  According to the positioning support system 2 and the positioning support method, when the SLP 50 is detected to be in a congested state, the SUPL-MT call and the source of the calls to the SLP 50 are the positioning requests from the LCS client 10. The SUPL-MO call that is the mobile communication terminal 60 that is the positioning target of the mobile station is subject to priority processing, and the SUPL-MO call that is not the mobile communication terminal 60 that is the positioning target of the positioning request from the LCS client 10 is the congestion control. It becomes a target. Thereby, even if the SLP 50 is in a congested state, the SUPL-MO call from the mobile communication terminal 60 to the SLP 50 generated by the SUPL-MT call and the positioning request from the LCS client 10 is preferentially processed. That is, since the SUPL-MT call is an important communication compared to the SUPL-MO call, the SUPL-MT call is processed with priority, and the SUPL-MO call performed as an extension of the SUPL-MT call is also processed with priority. . As a result, when the SLP 50 is congested, a positioning request from the LCS client 10 such as an emergency call receiving organization can be processed with priority.

  Since the SUPL-MT call and the SUPL-MO call are performed by independent modules, the call is a pure SUPL-MO call or an extension of the SUPL-MT call only by determining the call type. It cannot be determined whether the call is a SUPL-MO call. However, in the positioning support system 2 and the positioning support method, since the priority call storage unit 44 stores the identification information of the mobile communication terminal 60 that is the positioning target of the positioning request from the LCS client 10, the call source is By determining whether or not the mobile communication terminal 60 is identified by the identification information stored in the priority call storage unit 44, whether the mobile communication terminal 60 is a pure SUPL-MO call or a SUPL performed as an extension of a SUPL-MT call -It is possible to determine whether the call is an MO call.

  The priority call storage unit 44 stores time information indicating the time when the positioning request is received in association with the identification information included in the positioning request. Based on the time information stored in the priority call storage unit 44, the priority control unit 45 extracts identification information after a predetermined time from the identification information stored in the priority call storage unit 44, and the call source is Then, it is determined whether or not the mobile communication terminal 60 is identified by the extracted identification information. By using the identification information after a predetermined time among the identification information stored in the priority call storage unit 44, the call from the mobile communication terminal 60 to the SLP 50 which is generated regardless of the positioning request from the LCS client 10 is prioritized. This reduces the possibility of being processed.

  In addition, the encryption processing unit 41 determines whether or not the call is concealed, and if the call is concealed, the cipher processing unit 41 conducts a flat work. For this reason, it is possible to discriminate between the call type and the call source by leveling the concealed call. Therefore, when the SLP 50 is in a congested state, it is possible to determine whether or not to perform priority processing for a concealed call. Further, in the LB 40, since the cryptographic processing unit 41 can be implemented by hardware, the processing cost can be reduced.

[Second Embodiment]
FIG. 8 is a diagram schematically showing a configuration of a positioning system including a positioning support system according to the second embodiment. As shown in FIG. 8, the positioning system 1 </ b> A is different from the positioning system 1 in that a positioning support system 2 </ b> A is provided instead of the positioning support system 2. The positioning support system 2A is different from the positioning support system 2 in that a GW 20A is provided instead of the GW 20 and an LB 40A is provided instead of the LB 40. In this positioning support system 2A, the priority of the positioning request is determined according to the type of the LCS client 10, and priority control according to the priority is performed. For example, when the LCS client 10 is an emergency call receiving organization such as the police or fire department, the priority of the positioning request is set high, and the positioning request from the emergency call receiving organization has priority over the positioning request of other LCS clients 10. To be processed automatically.

  The GW 20A is different from the GW 20 in that a signal processing unit 22A is provided instead of the signal processing unit 22 and a priority management DB 23 is further provided. The priority management DB 23 functions as a priority information management unit that stores a priority management table for managing the priority for each LCS client 10. Specifically, the priority management DB 23 associates the LCS client ID that is the identification information of the LCS client 10 with the priority information that indicates the priority of the LCS client 10 that is identified by the LCS client ID. Stored in the priority management table. FIG. 9 is a diagram illustrating an example of a priority management table stored in the priority management DB 23. As shown in FIG. 9, in this example, the priority of the LCS client 10 with the LCS client IDs “AAA” and “CCC” is “high”, and the priority of the LCS client 10 with the LCS client ID “BBB” The degree is “normal”.

  The signal processing unit 22A functions as a priority information acquisition unit that acquires priority information of the LCS client 10 based on the priority management table stored in the priority management DB 23. Specifically, the signal processing unit 22A refers to the LCS client ID included in the positioning request from the LCS client 10 (that is, the LCS client ID of the LCS client 10 that is the positioning request source), and is stored in the priority management DB 23. The priority information associated with the LCS client ID is acquired from the priority management table. Then, the signal processing unit 22A inserts the MSISDN and the IMSI acquired by the subscriber information acquisition unit 21 into the positioning request as identification information of the mobile communication terminal 60, and sets a priority call flag corresponding to the acquired priority information. Insert into positioning request.

  For example, when the priority information indicates “high”, the value of the priority call flag is set to “1”, and when the priority information indicates “normal”, the value is set to “0”. The signal processing unit 22A transmits a positioning request with each parameter inserted to the SLP 50 via the LB 40A using a SUPL-MT call. Further, the signal processing unit 22A transmits the positioning result received from the SLP 50 to the LCS client 10 that is the positioning request source using the SUPL-MT call.

  The LB 40A is different from the LB 40 in that a congestion monitoring unit 42A is provided instead of the congestion monitoring unit 42, a priority call storage unit 44A is provided instead of the priority call storage unit 44, and a priority control unit 45 is provided. The difference is that a priority control unit 45A is provided. The congestion monitoring unit 42A functions as a monitoring unit that detects whether or not the SLP 50 is in a congestion state. The congestion monitoring unit 42A monitors traffic to the SLP 50. The congestion monitoring unit 42A detects that the SLP 50 is in a congestion state when the traffic to the SLP 50 is equal to or greater than a predetermined threshold T1. Further, the congestion monitoring unit 42A detects that the SLP 50 is in a high congestion state when the traffic to the SLP 50 is equal to or greater than a predetermined threshold T2. Note that the threshold value T2 is larger than the threshold value T1.

  In addition to the function of the priority call storage unit 44, the priority call storage unit 44A further stores the priority information acquired by the signal processing unit 22A in association with the identification information acquired by the subscriber information acquisition unit 21. It functions as a priority call storage means. More specifically, the priority call storage unit 44A uses the IMSI as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20A to the SLP 50. At the same time, the priority call flag is acquired from the signal. Then, the priority call storage unit 44A associates IMSI, time information indicating the time when the signal is received, and priority information indicating the priority indicated by the priority call flag, and stores them in the priority call management table. (A) of FIG. 10 is a figure which shows an example of the priority call management table with which the priority call memory | storage part 44A is provided.

  Further, the priority call storage unit 44A acquires MSISDN as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20A to the SLP 50, and The priority call flag is acquired from the signal. Then, the priority call storage unit 44A associates MSISDN, time information indicating the time when the signal is received, and priority information indicating the priority indicated by the priority call flag, and stores them in the priority call management table. FIG. 10B is a diagram showing another example of the priority call management table provided in the priority call storage unit 44A. In addition, the priority call storage unit 44A acquires IMSI and MSISDN as identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20A to the SLP 50. In addition, the priority call flag is acquired from the signal, the IMSI, the MSISDN, the time information indicating the time when the signal is received, and the priority information indicating the priority indicated by the priority call flag are associated with each other, and the priority call management table May be stored.

  In addition to the function of the priority control unit 45, the priority control unit 45A further performs priority processing according to priority information associated with identification information stored in the priority call management table of the priority call storage unit 44A. Functions as priority control means for determining a call. When the congestion monitoring unit 42A detects that the traffic to the SLP 50 is equal to or higher than the threshold value T1, the priority control unit 45A sets the SUPL-MT call as a target for priority processing. On the other hand, when the congestion monitoring unit 42A detects that the traffic to the SLP 50 is equal to or higher than the threshold T1, the priority control unit 45A further controls the priority of the priority call storage unit 44A for the SUPL-MO call. It is determined whether or not the mobile communication terminal 60 is identified by the identification information stored in the call management table. Then, the priority control unit 45A sets the SUPL-MO call that is not the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44A as the target of congestion control.

  In addition, when the congestion monitoring unit 42A detects that the traffic to the SLP 50 is equal to or higher than the threshold T1 and lower than the threshold T2, the priority control unit 45A determines that the call source is the priority call management of the priority call storage unit 44A. The SUPL-MO call, which is the mobile communication terminal 60 identified by the identification information stored in the table, is the target of priority processing. On the other hand, when the congestion monitoring unit 42A detects that the traffic to the SLP 50 is equal to or higher than the threshold T2, the priority control unit 45A stores the call source in the priority call management table of the priority call storage unit 44A. Calls that are mobile communication terminals 60 identified by the identification information and whose priority information associated with the identification information in the priority call management table is “high” are subject to priority processing, and the call source is The mobile communication terminal 60 is identified by the identification information stored in the priority call management table of the priority call storage unit 44A, and the priority information associated with the identification information in the priority call management table is “normal”. A call is subject to congestion control.

  Similar to the priority control unit 45, the priority control unit 45A, based on the time information stored in the priority call management table of the priority call storage unit 44A, identifies information stored in the priority call management table of the priority call storage unit 44A. The identification information after a predetermined time may be extracted, and it may be determined whether or not the call source is the mobile communication terminal 60 identified by the extracted identification information.

  Next, processing executed by the LB 40A for uplink communication will be described with reference to FIG. 11 and FIG. FIG. 11 is a flowchart showing processing executed by the LB 40A. FIG. 12 is a flowchart specifically showing the priority control of FIG. The processing shown in FIG. 11 is started when the LB 40A receives a call for the SLP 50. In addition, since the process of step S41-step S44 is the same as the process of step S01-step S04 of FIG. 5, the description is abbreviate | omitted.

  In step S45, the congestion monitoring unit 42A determines whether or not the traffic to the SLP 50 is equal to or greater than the threshold T1 (step S45: monitoring step). If it is determined in step S45 that the traffic to the SLP 50 is less than the threshold T1 (step S45; No), the priority control unit 45A accepts the call and performs normal processing (transfer processing) (step S46), and the LB 40A. Terminate the process. On the other hand, when it is determined in step S45 that the traffic to the SLP 50 is equal to or greater than the threshold T1 (step S45; Yes), the priority control unit 45A performs priority control for determining a call for performing priority processing among calls to the SLP 50. Perform (step S47: priority control step).

  Next, details of the priority control in step S47 will be described with reference to FIG. Here, since the process of step S51-step S54 is the same as the process of step S11-step S14 of FIG. 6, the description is abbreviate | omitted. When it is determined in step S53 that the IMSI or MSISDN included in the signal is in the priority call management table of the priority call storage unit 44A (step S53; Yes), the priority control unit 45A Priority information associated with IMSI or MSISDN is acquired, and it is determined whether or not the priority information indicates “high” (step S55). In step S55, when it is determined that the priority information associated with the IMSI or MSISDN indicates “high” (step S55; Yes), the priority control unit 45A sets the call as a target of priority processing and distributes the load. Is transmitted to one of the plurality of SLPs (step S52), and the processing of the LB 40A is terminated.

  On the other hand, when it is determined in step S55 that the priority information associated with the IMSI or MSISDN does not indicate “high” (indicates “normal”) (step S55; No), the congestion monitoring unit 42A performs the SLP50. It is determined whether or not the traffic to the destination is equal to or greater than the threshold value T2 (step S56). In step S56, when it is determined that the traffic to the SLP 50 is less than the threshold T2 (step S56; No), the priority control unit 45A sets the call as a target of priority processing and distributes the load to one of the plurality of SLPs. (Step S52), and the processing of the LB 40A is terminated. On the other hand, if it is determined in step S56 that the traffic to the SLP 50 is greater than or equal to the threshold T2 (step S56; Yes), the priority control unit 45A makes the call subject to congestion control and rejects the call reception ( Step S54), the processing of the LB 40A is terminated.

  As described above, the LB 40A is a SUPL-MT call and a SUPL-MO call that is a mobile communication terminal 60 whose source is identified by the identification information stored in the priority call management table of the priority call storage unit 44A. A call having a priority of “high” is subject to priority processing, and a SUPL-MO call that is not the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44 is congested. The target of control. Further, in the LB 40A, the call is a SUPL-MO call that is a mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44, and has a priority of “normal”. Is subject to priority processing when the traffic to the SLP 50 is equal to or greater than the threshold T1 and less than the threshold T2, and is subject to congestion control when the traffic to the SLP 50 is equal to or greater than the threshold T2.

  Next, with reference to FIG. 13, a positioning support method that is a process executed by the positioning support system 2A will be described. FIG. 13 is a flowchart showing a third-party positioning process executed by the positioning system 1A. In addition, since the process of step S61 and step S62 is the same as the process of step S21 and step S22 of FIG. 7, the description is abbreviate | omitted.

  Subsequent to step S62, the signal processing unit 22A of the GW 20A refers to the priority management table stored in the priority management DB 23, and obtains priority information associated with the LCS client ID of the LCS client 10 that is the positioning request source. (Step S63). Then, the signal processing unit 22A of the GW 20A makes a positioning request including the IMSI acquired from the MSISDN and the subscriber information DB 31 and the priority call flag corresponding to the priority information acquired from the priority management DB 23 by the SUPL-MT call. Is transmitted to the SLP 50 via (step S64).

  Subsequently, when receiving the positioning request from the GW 20A to the SLP 50, the priority call storage unit 44A of the LB 40A stores the identification information acquired in step S62 and the priority information acquired in step S63 in the priority call management table ( Step S65: priority call storage step). Specifically, the priority call storage unit 44A extracts the IMSI and MSISDN included in the positioning request and extracts the priority call flag. Then, the priority call storage unit 44A associates the IMSI and MSISDN with time information indicating the time when the positioning request is received and priority information indicating the priority indicated by the priority call flag, and stores them in the priority call management table. To do. Then, the priority control unit 45A of the LB 40A performs a load balancing process and transmits a positioning request to the SLP 50 (step S66). Since the subsequent processing of step S67 to step S72 is the same as the processing of step S26 to step S31 of FIG. 7, the description thereof is omitted.

  In the positioning support system 2A and the positioning support method performed by the positioning support system 2A, the same effects as in the first embodiment can be obtained. In the positioning support system 2A and the positioning support method performed by the positioning support system 2A, the priority management DB 23 of the GW 20A stores a priority management table in which the LCS client 10 and priority information indicating priority are associated with each other. The signal processing unit 22A of the GW 20A sends the positioning request including the priority information of the LCS client 10 acquired from the priority management table together with the identification information of the mobile communication terminal 60 that is the positioning target of the positioning request from the LCS client 10 to the LB 40A. To the SLP 50. Then, the priority call storage unit 44A of the LB 40A stores the identification information extracted from the positioning request from the GW 20A to the SLP 50 in association with the priority information, and the priority control unit 45A further stores it in the priority call storage unit 44A. The call for priority processing is determined according to the priority information associated with the identified identification information. For this reason, when the SLP 50 is congested, the positioning request from the LCS client 10 can be preferentially processed according to the priority of the LCS client 10. For example, when the LCS client 10 is an emergency call receiving organization, the positioning request from the emergency call receiving organization can be processed with higher priority by setting the priority of the LCS client 10 higher.

  In addition, this invention is not limited to embodiment mentioned above. For example, the priority control units 45 and 45A determine the call source from the identification information stored in the priority call management table of the priority call storage units 44 and 44A without determining the call type. If it is determined that the caller is the mobile communication terminal 60 identified by the identification information stored in the priority call management table of the priority call storage unit 44, 44A, the call is preferentially processed. It is good also as an object of.

  In this case, in response to the detection that the SLP 50 is in a congested state, among the calls to the SLP 50, the call whose source is the mobile communication terminal 60 that is the positioning target of the positioning request from the LCS client 10 is preferentially processed. It becomes the object of. Thereby, even when the SLP 50 is in a congested state, a call from the mobile communication terminal 60 to the SLP 50 caused by a positioning request from the LCS client 10 is preferentially processed. As a result, when the SLP 50 is congested, a call resulting from a positioning request from the LCS client 10 can be processed with priority, and a positioning request from an external client can be processed with priority.

  In addition, the priority call storage units 44 and 44A receive the IMSI and the identification information of the mobile communication terminal 60 that performs priority processing from the signal determined by the signal determination unit 43 as a positioning request transmitted from the GW 20 or 20A to the SLP 50. Any of MSISDN may be acquired. Then, the priority call storage units 44 and 44A may associate either IMSI or MSISDN with time information indicating the time when the signal is received, and store them in the priority call management table.

  The priority call storage units 44 and 44A may delete the identification information from the priority call management table when a predetermined time has elapsed since the identification information was stored in the priority call management table. .

  In the positioning support system 2A, the priority of the LCS client 10 is classified into two stages, but it may be classified into three or more stages, and the congestion monitoring unit 42A classifies the congestion state of the SLP 50 into three or more stages. May be detected. In this case, the priority control unit 45A may set the SUPL-MO call resulting from the positioning request from the LCS client 10 having a higher priority as the target of priority processing as the congestion state of the SLP 50 is higher.

  DESCRIPTION OF SYMBOLS 1,1A ... Positioning system, 2, 2A ... Positioning support system, 10 ... LCS client (positioning request source), 21 ... Subscriber information acquisition part (identification information acquisition means), 22, 22A ... Signal processing part (priority information) Acquisition means), 23 ... priority management DB (priority information management means), 31 ... subscriber information DB, 41 ... encryption processing section (encryption processing means), 42, 42A ... congestion monitoring section (monitoring means), 43 ... Signal discrimination unit, 44, 44A ... priority call storage unit (priority call storage unit), 45, 45A ... priority control unit (priority control unit), 50 ... SLP (positional information providing device), 60 ... mobile communication terminal.

Claims (7)

A positioning support system that relays a call to a location information providing device and causes the location information providing device to acquire location information of a mobile communication terminal in response to a positioning request from a positioning request source,
An identification information acquisition unit that receives a positioning request from a positioning request source and acquires identification information of a mobile communication terminal that is a positioning target of the positioning request based on the positioning request;
Priority call storage means for storing the identification information acquired by the identification information acquisition means;
Monitoring means for detecting whether or not the position information providing device is in a congested state;
Priority control means for determining a call to be preferentially processed among calls to the position information providing apparatus in response to the monitoring means detecting that the position information providing apparatus is in a congestion state;
With
The priority control means determines whether the call source is a mobile communication terminal identified by the identification information stored in the priority call storage means, and the source is identified by the identification information A positioning support system in which when a mobile communication terminal is determined, the call is subjected to priority processing.   The positioning support system according to claim 1, wherein the priority control unit further determines whether the call is a target of priority processing according to the type of the call.   When the call is a SUPL-MT, the priority control means sets the call as a target for priority processing, and when the call is a SUPL-MO, a caller is stored in the priority call storage means. 3. The call that is a mobile communication terminal identified by the identification information is a target of priority processing, and the call whose source is not a mobile communication terminal identified by the identification information is a target of congestion control. The positioning support system described in 1. The priority call storage means stores time information indicating a time when the call is received in association with the identification information acquired by the identification information acquisition means,
The priority control means extracts identification information after a predetermined time from the identification information stored in the priority call storage means based on the time information stored in the priority call storage means, and transmits a call. The positioning support system according to any one of claims 1 to 3, wherein it is determined whether or not the source is a mobile communication terminal identified by the extracted identification information. A priority information management means for storing a priority management table in which positioning request sources and priority information indicating priorities are associated;
Priority information acquisition means for acquiring priority information of the positioning request source based on the priority management table stored in the priority information management means;
Further comprising
The priority call storage means further stores the priority information acquired by the priority information acquisition means in association with the identification information acquired by the identification information acquisition means,
The priority control means further determines a call for priority processing according to the priority information associated with the identification information stored in the priority call storage means. The positioning support system according to any one of the above.   The positioning support system according to any one of claims 1 to 5, further comprising: an encryption processing unit that determines whether or not the call is concealed, and that is concealed when the call is concealed. . A positioning support method performed by a positioning support system that relays a call to a position information providing apparatus and causes the position information providing apparatus to acquire position information of a mobile communication terminal in response to a positioning request from a positioning request source,
An identification information acquisition step of receiving a positioning request from a positioning request source and acquiring identification information of a mobile communication terminal that is a positioning target of the positioning request based on the positioning request;
A priority call storage step for storing the identification information acquired in the identification information acquisition step;
A monitoring step of detecting whether or not the position information providing device is in a congested state;
A priority control step of determining a call to be preferentially processed among calls to the location information providing device in response to the location information providing device being detected in the congestion state in the monitoring step;
With
In the priority control step, it is determined whether or not the call source is a mobile communication terminal identified by the identification information stored in the priority call storage step, and the source is identified by the identification information A positioning support method in which, when it is determined that the terminal is a mobile communication terminal, the call is subjected to priority processing.

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