JP2007295076A - In-zone information management server, and in-zone information management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restore the in-zone information of a SIP server for normally providing a service even if the information of the SIP server where a mobile terminal of an in-zone information management server is resident, without the need for backup by location information. <P>SOLUTION: The in-zone information management server 102 uses an in-zone information management table 111a makes in-zone area information denoting a SIP server in the area of which the mobile terminal of a user is resident correspond to an in-zone warrant flag denoting the reliability of the in-zone area information, and manage them in an in-zone information management table 111a. When detecting the occurrence of its own abnormity, the in-zone information management server 102 sets "no warrant" to the in-zone warrant flag. The in-zone information management server 102 transmits an in-zone inquiry as to mobile terminals of externally designated users to all SIP servers 101-1, 101-2 and rewrites contents of the information management table on the basis of contents of a response to the in-zone inquiry. It is not required to store the in-zone information as backup information by transmitting the in-zone inquiry to all the SIP servers, and the in-zone information can be restored. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a location information management server and a location information management method, and more particularly to a location information management server and a location information management method having a function of recovering the location information after the location information disappears.

(Network configuration example)
A configuration example of a network for realizing communication using SIP (Session Initiation Protocol) will be described with reference to FIG. The network shown in the figure is a mobile terminal of a user a that exists within a wireless LAN (Local Area Network) formed by areas corresponding to a plurality of SIP servers 101-1, 101-2. Communication between mobile terminals including A and user b's mobile terminal B is realized.

In addition, this network includes a plurality of in-zone information management servers 102 and a subscriber information management system 103 provided corresponding thereto.
The SIP servers 101-1, 101-2,... Are call control servers that operate the IP telephone service on the IP network, and can perform location registration processing of mobile terminals connected to the network.

  The SIP server used by the mobile terminal as the location information registration processing when the mobile terminal is in the wireless LAN usable area is registered in any of the location information management servers 102. This registration is always performed when the mobile terminal accesses the location information management server via the SIP server. Since each of the SIP servers 101-1, 101-2,... And each of the in-zone information management servers 102 are connected by a full mesh, all of the SIP servers 101-1, 101-2,. Can be accessed.

The location information management server 102 registers the information of the SIP servers 101-1, 101-2... Used by the user's mobile terminal as the location information.
The subscriber information management system 103 is a system that holds service contract information and service provision status of users, and also manages information on services that the mobile terminal can use within the wireless LAN area. Therefore, the subscriber information management system 103 notifies service information related to the mobile terminal to the SIP server at the timing when the location information management server 102 performs the location information registration process of the mobile terminal. In this case, the in-zone information management server 102 inquires of the subscriber information management system 103 about the subscriber information, and the acquired subscriber information is transmitted to the SIP server.

  The SIP servers 101-1, 101-2,... That have acquired the subscriber information store service information related to the mobile terminal acquired from the area information management server 102 in addition to the area information of the mobile terminal. Since the location information management server 102 is connected to all the subscriber information management systems 103 in a full mesh, it is possible to provide user information to any of the SIP servers 101-1, 101-2. .

(Registration information registration process)
In communication using SIP, a mobile terminal performs a location information registration process when it is in a wireless LAN usable area. This location information registration process will be described with reference to FIG.
In the figure, the mobile terminal A of the user a in the wireless LAN area periodically transmits the location information registration request S11, and the SIP server used by the mobile terminal to the location information management server via the SIP server. Register. Further, the location information of the mobile terminal is also stored in the SIP server accessed from the mobile terminal. This location information registration process is usually performed at intervals of 30 to 60 minutes. When the location information registration process is performed, the SIP server stores the service information of the subscriber who uses the mobile terminal acquired from the location information management server in addition to the location information of the mobile terminal.

  The location information registration process is performed as follows. Upon receiving the location information registration request S12 from the SIP server 101-1, the location information management server 102 transmits a subscriber information acquisition request S13 regarding the user of the mobile terminal to the subscriber information management system 103. Then, the area information management server 102 that has received the subscriber information notification S14 from the subscriber information management system 103 performs the area information registration process S15 in the area information management table.

  Further, the located area information management server 102 transmits a user information notification S16, and notifies the SIP server 101-1 of the subscriber information acquired by the subscriber information notification S14. The SIP server 101-1 performs user information registration S17 in the user information table. When the registration of the user information is completed, the SIP server 101-1 transmits a request response S18 to the mobile terminal A of the user a.

  The SIP server 101-1 determines whether the service can be provided in response to a service execution request from the mobile terminal based on the acquired information, and performs call control suitable for each mobile terminal. Therefore, when a change in user information or a service provision condition occurs in the subscriber information management system 103, the SIP server that holds the location information of the mobile terminal is accessed via the location information management server 102. Promptly notify the user information and service condition change. By doing so, it becomes possible to provide a service in accordance with user information / service conditions managed by the subscriber information management system 103.

(Call processing)
Next, outgoing / incoming processing will be described with reference to FIG.
In the figure, the SIP server 101-1 that has received the connection request S21 by transmission from the mobile terminal A transmits a location information confirmation request S22 to the location information management server 102, and the destination user's mobile terminal (hereinafter referred to as the following) An inquiry is made to acquire the location information of the called destination mobile terminal. When the destination mobile terminal B has already performed the location information registration process at this time, the location information management server 102 knows the SIP server used by the destination mobile terminal. For this reason, the located area information management server 102 performs a called user information reading process S23 and returns a located area information notification S24. As a result, the information of the destination SIP server 101-2 is notified to the SIP server 101-1 that manages the source mobile terminal that is the inquiry source.

Thereafter, the SIP server 101-1 that manages the source mobile terminal performs a transfer process of the connection request S25 to the destination SIP server 101-2. As a result, the connection request S26 is transmitted from the destination SIP server 101-2 to the destination mobile terminal B.
The above processing is described in Non-Patent Document 1.

(Processing when the location information management server fails)
Processing when a failure occurs, for example, when the above-described location information management server fails will be described with reference to FIG.
In the same figure, when a failure occurs in the area information management server 102 that manages the SIP server 101-1 used by the mobile terminal A for each user, the area information of the registered SIP server disappears. Then, the contents of the location information management table return to the default value S30.

  Thereafter, the SIP server 101-1 that has received the connection request S31 transmitted from the mobile terminal A transmits a location information confirmation request S32 to the location information management server 102, and acquires the location information of the destination mobile terminal. To make an inquiry. In response to this inquiry, the location information management server 102 performs a destination user information reading process S33. However, since the contents of the in-zone information management table is the default value S30, the in-zone information notification NGS 34 is returned. Therefore, the SIP server 101-1 cannot acquire the location information about the mobile terminal B of the user b (that is, the SIP server 101-2). For this reason, connection from the mobile terminal A to the mobile terminal B cannot be performed.

Patent Documents 1 to 3 describe techniques for recovering position information when a failure occurs in a location register used in a mobile phone network.
JP 2000-224642 A JP 2004-80451 A Japanese Patent Laid-Open No. 11-234729 3GPP TS29.228 V6.7.0 (2005-06) IP Multimedia (IM) Subsystem Cx and Dx interfaces; Signaling flows and message contents (Release 6)

  As described above, when a failure occurs in the area information management server that manages the SIP server used by the mobile terminal for each user, the area information of the registered SIP server disappears. An unmatch occurs between the area information management server and the SIP server depending on the presence / absence of the area information of the mobile terminal. Therefore, the following problems occur.

(1) When a change in subscriber information or a change in service provision conditions occurs in the subscriber information management system, the subscriber information management system is directed to the SIP server in which the user is located with respect to the area information management server. However, since the location information of the SIP server used by the corresponding user has been erased, the user information and service conditions for the SIP server holding the mobile terminal information are required. Cannot be notified, and it becomes impossible to provide a service under service conditions according to user information managed by the subscriber information management system.
(2) In response to an incoming user status inquiry from the SIP server, the SIP server used by the destination mobile terminal cannot be specified, and incoming connection cannot be made.

  The technique described in Patent Document 1 has a problem that the contents of the location register are stored in another location register, and the amount of information to be stored increases. The technique described in Patent Document 2 also has a problem that the amount of information to be backed up increases. The technique described in Patent Document 3 is merely grouped in advance so that position information processing is not concentrated in the position information recovery process, and the above problem cannot be solved.

  The present invention has been made to solve the above-described problems of the prior art, and its purpose is not to back up location information, and the SIP server information in which the mobile terminal of the location information management server is located is erased. It is to provide a location information management server and a location information management method capable of recovering the location information of the SIP server in order to normally provide a service even in the case of being performed.

  The area information management server according to claim 1 of the present invention provides area information indicating which SIP server the user's mobile terminal is located in, and the reliability of the area information. A location information management table (for example, corresponding to the location information management table 111a in FIG. 1) for managing the location guarantee flag in association with the location guarantee flag, and when the abnormality of the own device is detected, the location guarantee flag A flag update means (for example, corresponding to the failure detection unit 113 in FIG. 1) for setting the service without guarantee and a service area inquiry for transmitting a service area inquiry about the user's mobile terminal designated from the outside to all SIP servers Inquiry means (for example, corresponding to the location information registration control unit 110 in FIG. 1) and a table that rewrites the content of the location information management table based on the content of the response to the location inquiry Rewriting means (for example, corresponding to the area information registration control unit 110 in FIG. 1), characterized in that it comprises a. By sending a location inquiry to all SIP servers, it is not necessary to store the information as a backup, and the location information can be restored.

  The area information management server according to claim 2 of the present invention is the area information management server according to claim 1, wherein the area inquiry means is triggered by at least one of an incoming call to the mobile terminal and an update of subscriber information about the mobile terminal. It is characterized by sending a service inquiry. In this way, when there is a SIP server inquiry request or a change of user information for a user whose presence guarantee flag is set to “no guarantee”, the presence status inquiry is executed for all SIP servers. , You can restore the location information.

  The location information management server according to claim 3 of the present invention is a failure information system according to claim 1 or 2, which is activated when an abnormality of the own device is detected, and measures a time set according to the location registration cycle from the mobile terminal. An elapse timer is further included, and the in-zone inquiry is not transmitted after the time measurement by the failure elapse timer expires. By doing this, the user whose location has been registered before the failure of the location information management server makes the failure progress time by setting the time including the period for performing the next periodic location registration as the failure elapsed timer time. After the timer expires, it is possible to take a measure that does not activate the in-zone status inquiry, and by performing the in-zone status inquiry only while the location registration processing after failure is not performed, the in-zone status management server and SIP The load on the server can be reduced.

  The area information management server according to claim 4 of the present invention is the server information management server according to any one of claims 1 to 3, wherein the table rewriting means includes a response to the area inquiry indicating that there is no area presence and an error. In the case of either one, the in-zone area information is set to a non-in-zone, and the in-zone guarantee flag is set with a guarantee. In this way, it is necessary to re-execute the in-zone information inquiry even if the response from all the SIP servers is “no area” or other error is received as a result of the area status inquiry to all the SIP servers. When it is determined that there is no service, it is possible to reduce the load on the located state management server and the SIP server.

  The location information management server according to claim 5 of the present invention is the server information management server according to any one of claims 1 to 4, wherein the table rewriting means is configured to update subscriber information from an operator terminal for a new mobile terminal user. At the time of registration, the presence guarantee flag is set with a guarantee. In this way, it is possible to make an in-zone information inquiry only while the location registration process is not performed after a failure occurs.

  According to a sixth aspect of the present invention, there is provided a location information management method according to the present invention, wherein the user's mobile terminal is located in the area corresponding to which SIP server and the presence area information indicating the reliability of the location area information. A location information management method in a location information management server having a location information management table for managing by associating with a coverage guarantee flag, and when an abnormality of the location information management server is detected, A flag update step (for example, corresponding to the default state S50 in FIG. 4) for setting the area guarantee flag to be non-guaranteed and an in-zone inquiry about the user's mobile terminal designated from the outside are sent to all SIP servers. Based on the contents of the response to the area inquiry step (for example, corresponding to step S105 in FIG. 7 and step S124 in FIG. 8) Located information management table table rewriting step of rewriting the contents of (e.g., step S108 in FIG. 7, corresponding to step S127 in FIG. 8), characterized in that it comprises a. By sending a location inquiry to all SIP servers, it is not necessary to store the information as a backup, and the location information can be restored.

  According to the present invention, it is not necessary to store the information as a backup by sending the inquiries to all SIP servers, and when the SIP server information in which the mobile terminal of the in-zone information management server is located is deleted In this case, there is an effect that the area information of the SIP server can be recovered in order to normally provide the service.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same parts as those in the other drawings are denoted by the same reference numerals.
(Overall network configuration)
The overall configuration of the network using the located area management server according to the embodiment of the present invention is the same as the configuration described above with reference to FIG.
That is, the SIP servers 1, 101-2,... Are call control servers that operate the IP telephone service on the IP network, and can perform location registration processing of mobile terminals connected to the network.

  When the mobile terminal is in the wireless LAN usable area, the SIP server used by the mobile terminal is registered in the location information management server 102 as the location information registration process. However, the location management server is always accessed via the SIP server. Is done. Each SIP server and each in-zone information management server are connected by a full mesh, so that each SIP server can access all the in-zone information management servers in response to the access of the mobile terminal.

The location information management server 102 manages the location status of each user by receiving a location registration request from the SIP server and registering the SIP server used by the user's mobile terminal.
The subscriber information management system 103 is a system that holds user service contract information and service provision status, and also manages information on services that the mobile terminal can use within the wireless LAN area. Therefore, the location information management server notifies the SIP server of service information related to the mobile terminal at the timing when the location information management server performs the location information registration process of the mobile terminal. The subscriber information is inquired to the server, and the acquired subscriber information is transmitted to the SIP server.

  The SIP server that has acquired the subscriber information stores service information related to the mobile terminal acquired from the location information management server 102 in addition to the location information of the mobile terminal. Since the located area information management server 102 is connected to all the subscriber information management systems 103 in a full mesh, the user information can be provided to any SIP server.

(Configuration of the location information management server)
A configuration example of the location information management server according to the embodiment of the present invention will be described with reference to FIG. This location information management server can be configured using a general computer device.
As shown in the figure, the location information management server 102 includes a location information registration control unit 110, a storage unit 111 in which a location information management table 111a is stored, and a subscriber information acquisition control unit 112. And a failure detection unit 113 that sets the area guarantee flag of all users held in the area information management table 111a to “no guarantee” when an abnormality of the area information management server (that is, the own apparatus) is detected. Has been.

The location information registration control unit 110 has a function of holding an interface with the SIP server, receiving a location information registration request from the SIP server, and notifying the SIP server of the location information registration result and the subscriber service information. . Further, it has a function of notifying the SIP server of the subscriber information notified from the subscriber information acquisition control unit 112.
The storage unit 111 stores a location information management table 111a. Upon receiving access from the location information registration control unit 110 and the failure detection unit 113, the location information management table is updated.

(Regional information management table)
FIG. 2 is a diagram illustrating a configuration example of the location information management table 111a. As shown in the figure, the location information management table 111a includes location information for each user (that is, information on the SIP server to be used) and a location guarantee flag. The default state of each item is location information: non-location, location guarantee flag: no guarantee.

The subscriber information acquisition control unit 112 holds an interface with the subscriber information management system, and the subscriber information acquisition control unit 112 that has received the subscriber information acquisition request from the in-zone information registration control unit 110 receives the subscriber information. User information is acquired from the information management system. Further, when the subscriber information acquisition control unit 112 is notified of the update of the user information from the subscriber information management system, the subscriber information acquisition control unit 112 also realizes notification of the user information to the in-zone information registration control unit 110.
When the failure detection unit 113 detects an abnormality in the location information management server, the location information and location guarantee flags of all users held in the location information management table 111a are in a default state (location information: non-location, location). Area guarantee flag: no guarantee).

(Registration information registration process)
FIG. 3 is a diagram showing a location information registration processing image in a network employing the location information management server according to the present invention.
In the figure, the mobile terminal A of the user a within the wireless LAN area periodically transmits the area information registration request S41. The mobile terminal A transmits it at a period of 30 minutes to 60 minutes, for example. The SIP server 101-1 that has received the location information registration request from the mobile terminal A transmits a location information registration request S42 to the location information management server 102 that manages the information of the user a. Having received the location information registration request S42, the location information management server 102 transmits a subscriber information acquisition request S43 to the subscriber information management system 103 in order to acquire the subscriber information of the user a. In the subscriber information management system 103, the information on the user a is notified to the located information management server 102 in the subscriber information notification S44.

  Then, the area information management server 102 that has received the subscriber information notification S44 from the subscriber information management system 103 performs an area information registration process S45 in the area information management table. In this case, the area information management server 102 refers to the information of the user a in the area information management table, updates the information of the SIP server 101-1 to the area information, and sets the area guarantee flag to “guaranteed”. Update to Thereafter, the location information management server 102 transmits a user information notification S46, and notifies the SIP information of the subscriber information of the user a acquired from the subscriber information management system to the SIP server 101-1. The SIP server 101-1 performs user information registration S47 in the user information table. When the registration of the user information is completed, the SIP server 101-1 transmits a request response S48 to the mobile terminal A of the user a.

  By the way, in the above operation, the location information registration process from the mobile terminal is periodically performed (for example, a period of 30 minutes to 60 minutes). After the elapse of time, the user who made an inquiry to the SIP server that sent the area information confirmation request without operating the area status inquiry function for the SIP server is not in the service area. To that effect. By this process, when there is a location registration confirmation request from the SIP server, if there is a user whose location has been registered before the failure of the location information management server, periodic location registration should be performed. After expiration, it is possible to take a measure that does not activate the in-zone status inquiry, and by performing the in-zone status inquiry only while the location registration processing after failure is not performed, the load of the in-zone status management server and the SIP server Can be reduced.

(Processing when the location information management server fails)
FIG. 4 is a diagram showing a processing image at the time of failure of the location information management server according to the present invention.
In the figure, when a failure occurs in the area information management server 102, the contents of the area information and the area guarantee flag in the area information management table are cleared, and the default state S50 (that is, area information: non-existing). Transition to “Built-in area, area guarantee flag: no guarantee”. Therefore, when the SIP servers 101-1 and 101-2 hold mobile terminal information in the wireless LAN area, the contents of the information and the contents of the area information management table of the area information management server 102 And become unmatched.

  For example, referring to the figure, the location information of the user a held in the SIP server 101-1 is “location”, whereas the location information management table of the location information management server 102 contains the user. Since the location information of a is registered as “non-location”, the two do not match. Similarly, the location information of the user b held in the SIP server 101-2 is “location”, whereas the location information management table of the location information management server 102 stores the location information of the user b. Are registered as “non-resident”, so they do not match. In this way, the information unmatched state indicated by the broken line arrow is resolved by the operation of the area information management server.

(Operation of the location information management server)
An example of operation of the location information management server according to the embodiment of the present invention will be described with reference to FIGS. 5 and 6.
FIG. 5 is a diagram showing an operation example of the located information management server according to the embodiment of the present invention, and shows an example of data recovery processing at an incoming call trigger after data disappearance. In the same figure, when the connection request signal S61 is transmitted from the mobile terminal A of the user a, the SIP server 101-1 inquires the local SIP server of the mobile terminal B of the called user b, so Is transmitted to the location information management server 102. Upon receiving this location information confirmation request S62, the location information management server 102 performs a process S63 for referring to the location information of the mobile terminal B in the location information management table. The location information management server 102 refers to the location guarantee flag when the location information is “non-location”, and when it is “no guarantee”, the location information inquiry S65 of the mobile terminal B to all the SIP servers. Send. The SIP server 101-2, which holds information about the mobile terminal B of the user b, returns a location information inquiry result S65 to the location information management server 102. Thereby, the location information management server 102 can acquire the location information of the mobile terminal B.

  The location information management server 102 performs processing S66 of reflecting the acquired location information in the location information management table and setting a location guarantee flag indicating that the location information is guaranteed to “guaranteed”. . Thereafter, the location information management server 102 notifies the SIP server 101-1 that the SIP server where the user b is located is the SIP server 101-2 in the inbound SIP server inquiry result S67 of the destination user b. The incoming connection process is continued. Thereby, the connection request signal S68 is transmitted from the SIP server 101-1, and the connection request signal S69 is transmitted from the SIP server 101-2 that has received the signal to the mobile terminal B.

  In addition, as a result of performing the location status inquiry to all the SIP servers, even if the response from all the SIP servers received by the location information management server 102 is “no location” or other errors are received, If it is determined that it is not necessary to perform the information inquiry again, the area guarantee flag in the area information management table is changed to “guaranteed”, and the area information is held as “non-area”.

  FIG. 6 is a diagram showing an operation example of the located information management server according to the embodiment of the present invention, and shows an example of data recovery processing at the subscriber information update opportunity after data disappearance. In the figure, the visited information management server 102 that has received the subscriber information update notification S71 of the user b of the mobile terminal B from the subscriber information management system 103 refers to the visited information of the mobile terminal B in the visited information management table. A process S72 is performed. The area information management server 102 refers to the area guarantee flag when the area information is “non-area”, and when it is “no guarantee”, the area information management server 102 makes an area information inquiry S73 of the mobile terminal B to all SIP servers. Send. The SIP server 101-2, which holds information about the mobile terminal B of the user b, returns a location information inquiry result S74 to the location information management server 102. Thereby, the location information management server 102 can acquire the location information of the mobile terminal B.

The location information management server 102 performs processing S75 for reflecting the acquired location information in the location information management table and setting a location guarantee flag indicating that the location information is guaranteed to “guaranteed”. . Thereafter, the location information management server 102 transmits a subscriber b's subscriber information update request S76 to the SIP server 101-2, and the SIP server 101-2 updates the subscriber information.
In addition, as a result of performing the location status inquiry to all the SIP servers, even if the response from all the SIP servers received by the location information management server 102 is “no location” or other errors are received, If it is determined that it is not necessary to perform the information inquiry again, the area guarantee flag in the area information management table is changed to “guaranteed”, and the area information is held as “non-area”.

(Location information recovery procedure sequence)
With reference to FIG. 7 and FIG. 8, the location information restoration procedure according to the embodiment of the present invention will be described.
FIG. 7 is a sequence diagram showing a location information recovery procedure (incoming trigger) according to the embodiment of the present invention, and corresponds to the operation example of FIG.
Referring to the figure, upon receiving a connection request signal from the mobile terminal A of the user a who is the caller (step S101), the SIP server 101-2 requests the visiting area information management server 102 to check the visiting area information. A signal is transmitted (step S102).

  When the location information management server 102 receives the location information confirmation request signal from the SIP server 101-2, the location information management server 102 refers to the location information management table and confirms the activation of the failure elapsed timer. As a result, when the location information is “non-location”, the failure elapsed timer is running, and the location guarantee flag is “no guarantee” (step S103 → S104), the location information management server 102 A location inquiry is executed for all SIP servers to which is connected (step S105). Information indicating a user who makes an inquiry is set in the in-zone inquiry signal.

  Each SIP server that has received the location inquiry confirms whether or not the inquired user is in the location (step S106). Then, each SIP server replies that the corresponding user is in the area inquiry response if the user is in the area (step S107), and if the user is not in the area, the area inquiry response To the effect that the corresponding user is not located (step S107).

  The location information management server 102 updates the location guarantee flag in the location information management table from “no guarantee” to “guaranteed” when receiving the fact that the user is in the location inquiry response (step S108). ). As a result of this update processing, the status of the location information management table is “SIP server 101-1” or “non-location” and the location guarantee flag is “guaranteed” for the receiving terminal B ( Step S109). When a reply to the effect that the user is in the area inquiry response is received, the user is immediately in the area information confirmation response to the SIP server that has transmitted the area information confirmation request. Information on the current SIP server is notified (step S110).

  If the location information is “present location” in step S103 or the failure elapsed timer is not activated, or if the location guarantee flag is “guaranteed” in step S104, the status of the location information management table is the receiving terminal B The location information becomes “non-location” or “SIP server 101-1”, and the location guarantee flag becomes “guaranteed” (step S111). In this case, the SIP server that transmitted the in-zone information confirmation request is notified that the inquired user is not in or out of service (step S110).

FIG. 8 is a sequence diagram illustrating a location information recovery procedure (subscriber information update opportunity) according to the embodiment of the present invention, and corresponds to the operation example of FIG.
Referring to the figure, when the subscriber information update notification signal is received from the subscriber information management system (step S121), the visited information management server 102 refers to the visited information management table and starts the failure elapsed timer. Check. As a result, when the location information is “non-location”, the failure elapsed timer is running, and the location guarantee flag is “no guarantee” (step S122 → S123), the location information management server 102 A location inquiry is executed for all SIP servers to which is connected (step S124). Information indicating a user who makes an inquiry is set in the in-zone inquiry signal.

  Each SIP server that has received the location inquiry confirms whether or not the inquired user is in the location (step S125). Then, each SIP server replies that the corresponding user is present in the area inquiry response if the user is present (step S126), and if the user is not present, the area inquiry response To the effect that the corresponding user is not located (step S126).

  The location information management server 102 updates the location guarantee flag in the location information management table from “no guarantee” to “guaranteed” when receiving the fact that the user is located in the location inquiry response (step S127). ). As a result of this update processing, the status of the location information management table is “SIP server 101-1” or “non-location” and the location guarantee flag is “guaranteed” for the receiving terminal B ( Step S128). Upon receiving a reply to the effect that the user is in the area inquiry response, the area information management server 102 is only in the case where the area information is “in area” (step S129), and the user is in the area. The subscriber information update notification is transmitted to the existing SIP server 101-1 (step S 130), and the user information held in the SIP server 101-1 is updated. Thereafter, the location information management server 102 transmits a subscriber information update response to the subscriber information management system 103 (step S132).

  If the location information is “present location” in step S122 or the failure elapsed timer is not activated, or if the location guarantee flag is “guaranteed” in step S123, the status of the location information management table is the receiving terminal B , The in-zone information becomes “non-in-zone” or “SIP server 101-1”, and the in-zone guarantee flag becomes “guaranteed” or “no guarantee” (step S131). In this case, the location information management server 102 transmits a subscriber information update notification to the SIP server 101-1 in which the user is located only when the location information is “located” (step S129). (Step S130), the user information held in the SIP server 101-1 is updated. Thereafter, the location information management server 102 transmits a subscriber information update response to the subscriber information management system 103 (step S132).

  By the way, in the above operation, the location information registration process from the mobile terminal is periodically performed (for example, a period of 30 minutes to 60 minutes), so that a period of time + α has elapsed since the failure recovery as the failure elapsed timer. After that, the in-zone state inquiry function for the SlP server is not operated. By this process, when there is a location registration confirmation request from the SIP server, if there is a user whose location has been registered before the failure of the location information management server, periodic location registration should be performed. After expiration, it is possible to take a measure that does not activate the in-zone status inquiry, and by performing the in-zone status inquiry only while the location registration processing after failure is not performed, the load of the in-zone status management server and the SIP server Can be reduced.

(New user registration procedure sequence)
FIG. 9 is a sequence diagram showing a new user registration procedure according to the embodiment of the present invention.
Referring to the figure, the registration information of the new user is transmitted from the operator terminal to the subscriber information management system 103 and the area information management server 102 (steps S141 and S142).
When registration information of a new user is transmitted from the operator terminal, the default status of the user's location information and location guarantee flag on the location information management table of the location information management server 102 indicates that the location information is “non- The “in-service area” and the in-area guarantee flag are “no guarantee”.

When the registration information of the new user is transmitted from the operator terminal, the in-zone information management server 102 receives the in-zone information confirmation request from the SIP server or the subscriber information update notification from the subscriber information management system As a measure not to activate the in-zone status inquiry at the timing, the in-zone guarantee flag of the corresponding user on the in-zone information management table is updated to “guaranteed” (step S143). As a result, the location information of the corresponding user on the location information management table is “non-location” and the location guarantee flag is “guaranteed” (step S144). By doing so, it is possible to make an in-zone state inquiry only while the post-failure location registration process is not performed.
A new user registration response is transmitted from the subscriber information management system 103 and the location information management server 102 to the operator terminal (steps S145 and S146).

(Regional information management method)
In the network configured using the above-described area information management server, the following area information management method is realized. In other words, the area information indicating which area the SIP server corresponds to the user's mobile terminal and the area guarantee flag indicating the reliability of the area information are associated with each other and managed. A flag updating step for setting a location guarantee flag without guarantee when a location information management server having a location information management table detects an abnormality in the location information management server. For example, it corresponds to the default state S50 in FIG. 4 and a region inquiry step for sending a region inquiry about the user's mobile terminal designated from the outside to all SIP servers (for example, step S105 in FIG. 7). , Corresponding to step S124 in FIG. 8), and writing the contents of the area information management table based on the contents of the response to the area inquiry Obtaining table rewriting step (e.g., step S108 in FIG. 7, corresponding to step S127 in FIG. 8) located information management method including the are realized. By sending a location inquiry to all SIP servers, it is not necessary to store the information as a backup, and the location information can be restored.

  The present invention can be used when restoring the location information held in the location information management server after it disappears.

It is a block diagram which shows the structural example of a located area information management server. It is a figure which shows the structural example of a location information management table. It is a figure which shows the area information registration process image in the network which employ | adopted the area information management server by this invention. It is a figure which shows the processing image at the time of a located area information management server failure by this invention. It is a figure which shows the operation example (The data recovery method at the time of the incoming call after data disappearance) of the located area information management server concerning embodiment of this invention. It is a figure which shows the operation example (The data recovery method in the subscriber information update opportunity after data disappearance) of the located area information management server concerning embodiment of this invention. It is a sequence diagram which shows the location information recovery procedure (incoming opportunity) concerning embodiment of this invention. It is a sequence diagram which shows the located area information recovery procedure (subscriber information update opportunity) concerning embodiment of this invention. It is a sequence diagram which shows the new user registration procedure concerning embodiment of this invention. It is a figure which shows the example of 1 structure of the network for implement | achieving communication using SIP. It is a figure which shows the location information registration process based on a standard specification. It is a figure which shows the outgoing / incoming call processing based on a standard specification. It is a figure which shows the process at the time of the conventional area information management server failure.

Explanation of symbols

101-1, 101-2 SIP server 102 Visited information management server 103 Subscriber information management system 110 Visited information registration control unit 111 Storage unit 111a Visited information management table 112 Subscriber information acquisition control unit

Claims (6)

  Visited area for managing the visited area information indicating which SIP server the user's mobile terminal is in, and the visited guarantee flag indicating the reliability of the visited area information in association with each other Information management table, flag update means for setting the in-zone guarantee flag without guarantee when an abnormality of the own device is detected, and in-zone inquiry about the user's mobile terminal designated from outside, A location information management server comprising: location inquiry means for sending to the server; and table rewriting means for rewriting the contents of the location information management table based on the content of a response to the location inquiry.   2. The area information management according to claim 1, wherein the area inquiry means transmits the area inquiry in response to at least one of an incoming call to the mobile terminal and an update of subscriber information about the mobile terminal. server.   It further includes a failure elapse timer that is activated when an abnormality of the own device is detected and measures a time set according to a region registration period from the mobile terminal, and when the time elapsed by the failure elapse timer expires, The in-zone information management server according to claim 1 or 2, characterized in that it is not transmitted.   The table rewriting means sets the location area information to non-location and guarantees the location guarantee flag when the content of the response to the location inquiry is either no location or error. The in-zone information management server according to any one of claims 1 to 3, wherein the server is set.   5. The table rewriting means sets the in-zone guarantee flag with guarantee when registering subscriber information from an operator terminal for a new mobile terminal user. The location information management server according to any one of the above.   Visited area for managing the visited area information indicating which SIP server the user's mobile terminal is in, and the visited guarantee flag indicating the reliability of the visited area information in association with each other A location information management method in a location information management server having an information management table, and when an abnormality of the location information management server is detected, a flag update step for setting the location guarantee flag without guarantee; A location inquiry step for sending a location inquiry about a user's mobile terminal designated from the outside to all SIP servers, and a table for rewriting the content of the location information management table based on the content of a response to the location inquiry A location information management method comprising a rewriting step.

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