JP4960168B2 - Destination subscriber information database server, source subscriber information database server, source call control server, communication system, and communication method - Google Patents

Description

  The present invention relates to a destination subscriber information database server, a source subscriber information database server, a source call control server, a communication system, and a communication method.

Conventionally, CS (Circuit Switched) and IMS (IP Multimedia Subsystem) are known as communication methods for realizing communication services for mobile devices. When a user of a mobile device uses a communication service on a CS network or an IMS network, location registration is performed in each network domain to which the mobile device belongs (see, for example, Patent Document 1). The call control server in each network domain acquires information necessary for location registration from the subscriber information database server for each network domain and holds it. The subscriber information database server in each network domain associates the specific information of the call control server and the mobile device that performed the location registration and manages them as location information.
JP-A-8-98249

  The subscriber information database servers in different network domains are not notified to each other regarding the location information. For this reason, one subscriber information database server cannot grasp the location registration performed on the other subscriber information database server side, and according to the location registration performed on the other subscriber information database server side. It is difficult to perform some control.

  Therefore, the present invention has been made in view of the above, and a destination subscriber information database server in which one subscriber information database server can grasp location registration performed on the other subscriber information database server side. It is an object of the present invention to provide a source subscriber information database server, source call control server, communication system, and communication method.

In order to solve the above problems, a destination subscriber information database server of the present invention includes a mobile device, a source call control server for a source network domain, and a source subscriber information database server for a source network domain. A destination subscriber information database server for a destination network domain included in a communication system including the mobile device, wherein the mobile device is temporarily moved from the source network domain to which the mobile station belongs to the destination network domain. The destination call control server for the destination network domain transmits information for performing location registration to the mobile device to the destination call control server, and after the location registration, the mobile device and the destination location registration control means for determining whether the communication range of the domain, the destination location registration control means , After the mobile station is determined not in the communication area of the source network domain, the destination notifying means for notifying the mobile source subscriber information database server that the mobile station existing under the destination call control server, the Prepare.

  The source subscriber information database server of the present invention includes a mobile device, a destination subscriber information database server for the destination network domain, and a source call control server for the source network domain. A source subscriber information database server for a source network domain included in a communication system to be moved when the mobile device is temporarily moved from the source network domain to which it belongs to the destination network domain. The source notification means that the destination subscriber information database server notifies that the mobile unit exists under the destination call control server for the network domain, and the fact that the source notification means is notified of the fact To cancel the cancellation of location registration that the mobile call control server has already performed for the mobile device. Includes a movement source location registration control means for transmitting a signal to the mobile Motoko control server, the.

  The mobile call control server of the present invention includes a mobile device, a mobile subscriber information database server for the mobile network domain, and a mobile subscriber information database server for the mobile network domain. If the mobile station is temporarily moved from the source network domain to which it belongs to the destination network domain, the mobile call control server for the source network domain included in the communication system Receiving means for receiving from the source subscriber information database server a release prohibition signal for prohibiting the release of location registration that has already been performed, and in response to the reception means receiving the release prohibition signal, And holding means for continuously holding information for performing position registration.

  The communication system of the present invention includes the above-described mobile device, a destination subscriber information database server, a source subscriber information database server, and a source call control server.

  The communication method of the present invention includes a mobile device, a destination subscriber information database server for a destination network domain, a source subscriber information database server for a source network domain, and a source network domain migration. A communication method in a communication system including an original call control server, and when a mobile device is temporarily moved from a source network domain to which a mobile station belongs to a destination network domain, destination subscriber information First location registration control in which the destination location registration control means of the database server transmits information for the location destination call control server for the destination network domain to perform location registration to the mobile device to the destination call control server. Step, the destination notification means of the destination subscriber information database server, after the location registration, A first notification step for notifying the source subscriber information database server that a mobile unit exists under the control server and a source notification means of the source subscriber information database server are under control of the destination call control server. A second notifying step in which the destination subscriber information database server is notified that the mobile device is present, and the source location registration control means of the source subscriber information database server is the source notifying means in the second notifying step. In response to the notification of the fact, the mobile call control server transmits a release prohibition signal to the mobile call control server to prohibit the release of the location registration that has already been performed for the mobile device. 2-location registration control step, a receiving step in which the receiving means of the source call control server receives a release prohibition signal from the source subscriber information database server, Holding means of the control server, in response to the receiving means receives the release prohibition signal at the receiving step, and a holding step of continuing to hold the information for performing the location registration to the mobile unit.

  According to such a destination subscriber information database server, source subscriber information database server, source call control server, communication system and communication method of the present invention, the communication system includes a mobile unit, destination subscriber information A database server, a source call control server, and a source subscriber information database server are included. When the mobile device is temporarily moved from the source network domain to which it belongs to, for example, overseas roaming for several days, to the destination network domain of the destination, the destination subscriber information database server Is registered in the destination call control server for the destination network domain. The destination subscriber information database server can cause the destination call control server to perform location registration by providing, for example, service information necessary for location registration to the destination call control server. Then, after location registration, the destination subscriber information database server notifies the source subscriber information database server that the location of the mobile device exists under the destination call control server.

  In this way, the destination subscriber information database server notifies the source subscriber information database server of information related to location registration, so that the source subscriber information database server is performed on the destination subscriber information database server side. It becomes possible to grasp the location registration.

  The source subscriber information database server notified from the destination subscriber information database server that the mobile unit exists under the destination call control server sends a release prohibition signal to the source call control server. The mobile call control server is prohibited from canceling the location registration already performed between the mobile call control server and the mobile device. That is, the source subscriber information database server can perform some control on the source call control server in accordance with the location registration performed on the destination subscriber information database server side.

  The source call control server that has received the cancellation prohibition signal from the source subscriber information database server continues to hold without removing, for example, service information, which is information necessary for location registration with the mobile device. As a result, when there is an incoming call for a mobile device that has temporarily moved to the destination network domain due to roaming or the like, the mobile device that has been moved to the destination network domain returns from the destination to the source network domain. In this case, the mobile call control server continues to hold the service information of the mobile device, for example, without downloading it again from the mobile subscriber information database server in order to re-register the location with the mobile device. The service information of the mobile device can be reused. As a result, the procedure necessary for performing the download can be omitted, and the incoming service control procedure for the mobile device during roaming or after returning can be simplified. Further, the communication load between the source subscriber information database server and the source call control server can be reduced, and processing pressure on the source subscriber information database server can be suppressed.

  The destination notification means of the destination subscriber information database server of the present invention includes destination call control server specifying information for specifying the destination call control server and mobile unit specifying information for specifying the mobile unit. By transmitting a signal to the source subscriber information database server, the source subscriber information database server may be notified that the mobile unit exists under the destination call control server. In this case, the moving destination call control server specifying information and the moving device specifying information can be used as a signal indicating that the moving device exists under the moving destination call control server.

  The source notification means of the source subscriber information database server of the present invention includes destination call control server specifying information for specifying a destination call control server and mobile unit specifying information for specifying a mobile unit. By receiving the signal from the destination subscriber information database server, it may be notified that the mobile device exists under the destination call control server. In this case, the moving destination call control server specifying information and the moving device specifying information can be used as a signal indicating that the moving device exists under the moving destination call control server.

  The source notification means of the source subscriber information database server according to the present invention is such that when the mobile station returns from the destination network domain to the source network domain, the mobile station returns to the subordinate of the source call control server. This may be notified to the destination subscriber information database server. In this way, the source subscriber information database server notifies the destination subscriber information database server of information related to location registration, so that the destination subscriber information database server is performed on the source subscriber information database server side. It becomes possible to grasp the location registration.

  Further, the destination location registration control means of the destination subscriber information database server of the present invention provides that the mobile unit is subordinate to the source call control server when the mobile unit returns from the destination network domain to the source network domain. When the source subscriber information database server is notified of the return, a signal to cancel the location registration between the destination call control server and the mobile station may be transmitted to the destination call control server. . Accordingly, the destination call control server that has received the signal for canceling the location registration with the mobile device can reliably cancel the location registration with the mobile device based on the signal.

  According to the present invention, it is possible for one subscriber information database server to grasp the location registration performed on the other subscriber information database server side.

  Exemplary embodiments of a destination subscriber information database server, a source subscriber information database server, a source call control server, a communication system, and a communication method according to the present invention will be described below in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  First, the configuration of the communication system 1 according to the embodiment of the present invention will be described with reference to FIG. In FIG. 1, two different mobile communication core networks are imagined. One mobile communication core network in FIG. 1 is a mobile communication core network of the own operator, and the other mobile communication core network in FIG. 1 is a mobile communication core network of another operator.

  A CS network domain (destination network domain) is configured on the mobile communication core network of another provider. In the CS network domain, a CS system group 20 (movement destination call control server) including an MSC (Mobile Services Switching Center) and a VLR (Visitor Location Register) is arranged. The CS system group 20 is a group of devices for providing communication services to the mobile devices 10 existing in the CS network domain. In order to perform a communication service, the CS system group 20 first performs location registration for the mobile device 10 that has entered the area. Service information and the like necessary for performing location registration can be requested and provided to a CS subscriber information database server 30 described later.

  On the other hand, an HLR (Home Location Register) is arranged as a CS subscriber information database server 30 (moving destination subscriber information database server) on the mobile communication core network of the operator. In addition, on the mobile communication core network of the operator, an HSS (Home Subscriber Server) is arranged as an IMS subscriber information database server 40 (source subscriber information database server), and a CSCF (Call Session Control Function). And an IMS system group 50 (movement source call control server) including AS (Application Server). The communication system 1 includes a CS subscriber information database server (hereinafter referred to as “CS subscriber DB”) 30 and an IMS subscriber information database server (hereinafter referred to as “IMS subscriber DB”). .) Mobile device including 40 and IMS system group 50 that can temporarily move from the IMS network domain of its own operator to the CS network domain of another operator, such as overseas roaming for several days 10 is provided. Hereinafter, each component which comprises the communication system 1 is demonstrated in detail.

  The mobile device 10 is not shown, but physically includes a CPU, RAM and ROM as main storage devices, operation units such as operation buttons, output devices such as an LCD and an organic EL display, a CS system group 20 and an IMS system. A communication unit that transmits and receives data to and from the group 50 and an auxiliary storage device such as a memory device are provided. Each function of the mobile device 10 to be described later is to operate the operation unit, the output device, and the communication unit under the control of the CPU by reading predetermined software on the hardware such as the CPU and RAM, This is realized by reading and writing data in the auxiliary storage device. In this embodiment, the mobile device 10 originally belongs to the IMS network domain of the own operator side and receives communication services. However, as shown in FIG. It is possible to temporarily move to the CS network domain and return to the IMS network domain again.

  The CS subscriber DB 30 is an aggregate database having a function of managing subscriber information including service information necessary for location registration between the CS system group 20 and the mobile device 10, for example. As shown in FIG. 2, the CS subscriber DB 30 physically includes a CPU 31, a main storage device such as a ROM 32 and a RAM 33, an input device 34 such as a keyboard and a mouse, an output device 35 such as a display, and a CS system group 20. And a normal computer system including a communication module 36 such as a network card for transmitting / receiving data to / from the IMS subscriber information database server 40, an auxiliary storage device 37 such as a hard disk, and the like. Each function of the CS subscriber DB 30, which will be described later, allows the communication module 36, the input device 34, and the output device 35 to be controlled under the control of the CPU 31 by reading predetermined computer software on the hardware such as the CPU 31 and the RAM 33. This is realized by operating and reading and writing data in the main storage devices 32 and 33 and the auxiliary storage device 37.

  FIG. 3 is a schematic configuration diagram of the CS subscriber DB 30. The CS subscriber DB 30 is functionally configured to include a location registration control unit 310 (destination location registration control unit), a subscriber information management unit 320, and a notification unit 330 (destination destination notification unit). The location registration control unit 310 controls the location registration of the mobile device 10 when the mobile device 10 enters the communication area of the CS network domain or when the mobile device 10 moves out of the communication area of the CS network domain. Is to do. The subscriber information management unit 320 manages subscriber information and the like of the mobile device 10. When the mobile device 10 enters the communication area of the CS network domain, or when the mobile device 10 moves out of the communication area of the CS network domain, the notification unit 330 displays IMS location information regarding the location of the mobile device 10. The subscriber information database server 40 is notified or notified.

  Returning to FIG. 1, the IMS subscriber DB 40 is an aggregate database having a function of managing subscriber information including service information necessary for location registration between the IMS system group 50 and the mobile device 10, for example. As shown in FIG. 2, the IMS subscriber DB 40 physically includes a CPU 41, a main storage device such as a ROM 42 and a RAM 43, an input device 44 such as a keyboard and a mouse, an output device 45 such as a display, and a CS subscriber. It is configured as a normal computer system including a communication module 46 such as a network card for transmitting and receiving data between the DB 30 and the IMS system group 50, an auxiliary storage device 47 such as a hard disk, and the like. Each function of the IMS subscriber DB 40, which will be described later, allows the communication module 46, the input device 44, and the output device 45 to be controlled under the control of the CPU 41 by loading predetermined computer software on the hardware such as the CPU 41 and the RAM 43. This is realized by operating and reading and writing data in the main storage devices 42 and 43 and the auxiliary storage device 47.

  FIG. 4 is a schematic configuration diagram of the IMS subscriber DB 40. The IMS subscriber DB 40 is functionally configured to include a location registration control unit 410 (movement source location registration control means), a subscriber information management unit 420, and a notification unit 430 (movement source notification means). The location registration control unit 410 is used when the mobile device 10 temporarily moves into the communication area of the CS network domain of another operator or when the mobile device 10 moves from the communication area of the CS network domain of the other operator. When the mobile phone 10 returns to the communication area of the IMS network domain, control related to the location registration of the mobile device 10 is performed. The subscriber information management unit 420 manages subscriber information and the like of the mobile device 10. The notification unit 430 is configured to display the IMS of the own operator when the mobile device 10 temporarily moves into the communication area of the CS network domain of another operator or from the communication area of the CS network domain of the other operator. When returning to the communication area of the network domain, information related to location registration of the mobile device 10 is notified or notified from the CS subscriber DB 30.

  Returning to FIG. 1, the IMS system group 50 is a group of devices for providing communication services to the mobile devices 10 existing in the IMS network domain. In order to perform a communication service, first, location registration is performed with respect to the mobile device 10 in the area. The service information necessary for performing location registration can be requested and provided to the IMS subscriber DB 40. In the present embodiment, the mobile device 10 originally belongs to the IMS network domain and receives a communication service, and location registration has already been performed between the mobile device 10 and the IMS system group 50. The IMS system group 50 periodically performs position registration with the mobile device 10 while the mobile device 10 exists in the area. As a result, the mobile device 10 can notify the IMS system group 50 that its own terminal exists within the communication area formed by the IMS system group 50. On the other hand, when a fixed time has passed without periodic location registration, the IMS system group 50 registers the location with the mobile device 10 if there is no notification from the IMS subscriber DB 40 as will be described later. Is released. When the location registration is canceled, the service information registered at the time of location registration is cleared. For example, when the mobile device 10 returns to the communication range of the IMS system group 50, the location registration is performed again to reuse the communication service. It is necessary to carry out.

  As shown in FIG. 2, the IMS system group 50 is physically composed of a CPU 51, a main storage device such as a ROM 52 and a RAM 53, an input device 54 such as a keyboard and a mouse, an output device 55 such as a display, and an IMS subscriber DB 40. And a communication module 56 such as a network card for transmitting / receiving data to / from the computer, and an auxiliary storage device 57 such as a hard disk. Each function of the IMS system group 50 to be described later operates the communication module 56, the input device 54, and the output device 55 under the control of the CPU 51 by reading predetermined computer software on the hardware such as the CPU 51 and the RAM 53. In addition, it is realized by reading and writing data in the main storage devices 52 and 53 and the auxiliary storage device 57.

  FIG. 5 is a schematic configuration diagram of the IMS system group 50. Functionally, the IMS system group 50 includes a location registration control unit 510 (reception unit), a subscriber information management unit 520, and a location registration state monitoring unit 530 (holding unit). When the mobile device 10 temporarily moves from the IMS network domain of the own operator to which the mobile device 10 originally belongs to the communication area of the CS network domain of the other operator, the location registration control unit 510 causes the IMS system group 50 to be transferred to the mobile device 10. In response to this, a cancellation prohibition signal for prohibiting cancellation of location registration that has already been performed is received from the IMS subscriber DB 40. In response to the reception of the cancellation prohibition signal from the location registration control unit 510, the subscriber information management unit 520 and the location registration state monitoring unit 530 hold the location registration for the mobile device 10 in a state where it is not released.

  Subsequently, an operation (communication method) performed by each component of the communication system 1 will be described. First, the case where the mobile device 10 is temporarily moved from the IMS network domain to which the mobile device 10 belongs to the CS network domain will be described with reference to FIG. FIG. 6 is a sequence diagram showing the operation of the communication system 1 in this case.

  When the mobile device 10 temporarily moves from the IMS network domain where the location registration has already been performed and received the communication service to the CS network domain, as shown in FIG. 6, first, based on the 3GPP (3rd Generation Partnership Project) standard Location registration control is performed on the CS network domain side. That is, when the mobile device 10 requests location registration from the CS system group 20, the CS system group 20 requests the CS subscriber DB 30 for necessary information. Then, the CS subscriber DB 30 provides the CS system group 20 with information necessary for location registration such as service information. The CS system group 20 downloads information from the CS subscriber DB 30 and performs location registration (step S100, first location registration control step).

  In parallel with step S100, the CS subscriber DB 30 holds information related to location registration (step S200), and the IMS subscriber DB 40 indicates that the mobile device 10 exists under the CS system group 20 after location registration. Notification is made (step S300, first notification step).

  FIG. 7 is a sequence diagram showing in detail operations performed within the CS subscriber DB 30 in order to execute Step S100, Step S200, and Step S300. First, when the above-described location registration is performed by the location registration control unit 310 of the CS subscriber DB 30 (step S100), the location registration control unit 310 changes the subscriber status for the mobile device 10 to the subscriber information management unit 320. Request that. This request is made by transmitting a user identifier and an address on the network of the CS system group 20 (hereinafter referred to as “CS address”) to the subscriber information management unit 320. The user identifier (mobile communication terminal specifying information) is information for specifying the mobile device 10 and includes information from which the IMS subscriber DB 40 of the IMS network domain to which the mobile device 10 originally belongs can be derived. ing. The CS address (movement destination call control server identification information) is information for identifying the CS system group 20 to which the mobile device 10 currently belongs (step S101).

  The subscriber information management unit 320 that has received the user identifier and the CS address in step S101 identifies the mobile device 10 from the user identifier (step S102), and holds the CS address (step S103). As a result, the subscriber status of the mobile device 10 indicating that the mobile device 10 exists under the CS system group 20 is stored in the subscriber information management unit 320 of the CS subscriber DB 30. Next, the subscriber information management unit 320 notifies the location registration control unit 310 that step S102 and step S103 have been completed as a response to the request of step S101 (step S104).

  The location registration control unit 310 that has received the response in step S104 determines whether or not the mobile device 10 is within the communication range of the IMS network domain. This determination can be made using, for example, a CS address. That is, for example, when the CS address is a network address outside the communication area of the IMS network domain, the location registration control unit 310 determines that the mobile device 10 exists outside the communication area of the IMS network domain. Since the mobile device 10 is temporarily moved from the IMS network domain to which the mobile device 10 currently belongs to the CS network domain, the location registration control unit 310 determines that the mobile device 10 exists outside the communication range of the IMS network domain ( Step S105).

  The location registration control unit 310 that has determined in step S105 that the mobile device 10 exists outside the communication area of the IMS network domain indicates that the mobile device 10 exists under the CS system group 20 and is a subscriber DB 40 for IMS. To the notification unit 330. This request is made by the location registration control unit 310 transmitting the user identifier and CS address to the notification unit 330 (step S106).

  The notification unit 330 that has received the user identifier and the CS address in step S106 first extracts the network address of the IMS subscriber DB 40 in the IMS network domain to which the mobile device 10 originally belongs from the user identifier (step S107). ). Next, the notification unit 330 transmits a user identifier and a CS address to the IMS subscriber DB 40 as a signal indicating that the mobile device 10 exists under the CS system group 20 (step S108).

  Returning to FIG. 6, the IMS subscriber DB 40 is notified by the CS subscriber DB 30 of a signal indicating that the mobile device 10 exists under the CS system group 20, and holds the signal (step S <b> 400, second notification). Step). Next, the IMS subscriber DB 40 prohibits the cancellation of the location registration that the IMS system group 50 has already performed for the mobile device 10 in response to the notification in step S400. A signal is transmitted to the IMS system group 50 (step S500, second location registration control step).

  FIG. 8 is a sequence diagram showing in detail an operation performed inside the IMS subscriber DB 40 in order to execute Step S400 and Step S500. First, upon receiving the user identifier and CS address transmitted from the CS subscriber DB 30 in step S108 described above (step S401), the location registration control unit 410 causes the subscriber information management unit 420 to enter the subscriber status for the mobile device 10. Request to change. This request is made by transmitting the user identifier and CS address received in step S401 to the subscriber information management unit 420 (step S402).

  The subscriber information management unit 420 that has received the user identifier and the CS address in step S402 identifies the mobile device 10 from the user identifier (step S403), and the mobile device 10 is currently in the location registration in the IMS network domain. Is determined (step S404), the CS address is held (step S405), and the information that prohibits the release of the location registration of the mobile device 10 in the IMS network domain is held as the subscriber status of the mobile device 10 (step S405). S406). As a result, the subscriber status of the mobile device 10 that the mobile device 10 currently exists under the CS system group 20 is stored in the subscriber information management unit 420 of the IMS subscriber DB 40. Next, the subscriber information management unit 420 indicates that the above steps S403 to S406 have been completed and the network address of the IMS system group 50 in which the mobile device 10 is registered in the determination in step S404 (hereinafter referred to as “CSCF”). The address registration control unit 410 is notified as a response to the request in step S402 (step S407).

  Next, the location registration control unit 410 generates a cancellation prohibition signal and requests the notification unit 430 to transmit the cancellation prohibition signal to the IMS system group 50. This request is made by the location registration control unit 410 transmitting the user identifier, CSCF address, and release prohibition signal to the notification unit 430 (step S408).

  The notification unit 430 that has received the user identifier, the CSCF address, and the release prohibition signal in step S <b> 408 is a user identifier as a signal indicating that the IMS system group 50 prohibits the release of the location registration that has already been performed for the mobile device 10. The release prohibition signal is transmitted to the IMS system group 50 specified by the CSCF address (step S409).

  Returning to FIG. 6, when the IMS system group 50 receives the release prohibition signal from the IMS subscriber DB 40 (step S600, reception step), the IMS system group 50 maintains the location registration already performed for the mobile device 10 without releasing it, For example, information such as service information necessary for location registration is kept without being removed (step S700, holding step).

  FIG. 9 is a sequence diagram showing in detail the operations performed inside IMS system group 50 in order to execute steps S600 and S700. First, upon receiving the user identifier and cancellation prohibition signal transmitted from the IMS subscriber DB 40 in step S409 described above (step S601), the location registration control unit 510 cancels location registration in the location registration state monitoring unit 530. Request to stop the timer. This request is made by transmitting the user identifier and release prohibition signal received in step S601 to the location registration state monitoring unit 530 (step S602).

  The location registration state monitoring unit 530 that has received the user identifier and the release prohibition signal in step S602 identifies the mobile device 10 from the user identifier (step S603), and controls to stop the location registration release timer for the mobile device 10. . That is, even if a certain amount of time has passed without periodic location registration from the mobile device 10, the location registration state monitoring unit 530 maintains the location registration for the mobile device 10 without canceling the location registration. The necessary information such as service information is kept without being removed (step S604). In addition, as described above, the position registration state monitoring unit 530 originally cancels the position registration with the mobile device 10 when a certain timer has elapsed without periodic location registration from the mobile device 10. It is something to be made. Next, the location registration state monitoring unit 530 notifies the location registration control unit 510 that step S603 and step S604 have been completed as a response to the request in step S602 (step S605).

  Next, the location registration control unit 510 requests the subscriber information management unit 520 to change the subscriber status of the mobile device 10. This request is made by transmitting a user identifier and a cancellation prohibition signal to the subscriber information management unit 520 (step S606).

  The subscriber information management unit 520 that has received the user identifier and the cancellation prohibition signal in step S606 identifies the mobile device 10 from the user identifier (step S607), and informs the subscriber information of the mobile device 10 that location registration cancellation is prohibited. Registration is performed (step S608). Next, the subscriber information management unit 520 notifies the location registration control unit 510 that step S607 and step S608 have been completed as a response to the request of step S606 (step S609).

  Next, a case where there is an incoming call to the mobile device 10 that has temporarily moved to the CS network domain will be described with reference to FIG. 10. FIG. 10 is a sequence diagram showing an operation of the communication system 1 in this case. .

  For example, when the IMS system group 50 is requested by another mobile device to receive an incoming call for the mobile device 10 (step S120), the IMS system group 50 first checks the presence / absence of service information of the mobile device 10. That is, the IMS system group 50 confirms whether or not the location registration for the mobile device 10 is cancelled. In steps S604 and S608 described above, the IMS system group 50 did not cancel the location registration for the mobile device 10, so the IMS system group 50 confirms that the service information of the mobile device 10 still exists (step S220).

  Next, the IMS system group 50 provides an incoming service in response to the incoming request in step S120. That is, for example, the IMS system group 50 can establish communication by establishing a communication session between another mobile device that has made an incoming call request and the mobile device 10 that is temporarily moving to the CS network domain. . Alternatively, the IMS system group 50 generates and holds information indicating that an incoming request has been received from another mobile device without establishing a communication session between the other mobile device and the mobile device 10, for example. be able to. This information can be transmitted to the mobile device 10 when the mobile device 10 returns to the IMS network domain, for example. When performing the incoming service to the mobile device 10 in this way, the IMS system group 50 does not download the service information of the mobile device 10 from the IMS subscriber DB 40, but proceeds to step S700 including, for example, step S604 and step S608. The service information and the like of the mobile device 10 that is continuously held can be reused (step S320).

  Next, a case where the mobile device 10 returns to the IMS network domain to which the mobile device 10 originally belonged will be described with reference to FIG. 11. FIG. 11 illustrates the operation of the communication system 1 in this case. FIG.

  First, when the mobile device 10 that has returned to the IMS network domain requests location registration from the IMS system group 50 (step S140), it is confirmed that the IMS system group 50 holds the service information of the mobile device 10. (Step S240), a request related to location registration of the mobile device 10 is made to the IMS subscriber DB 40 (Step S340).

  FIG. 12 is a sequence diagram showing in detail the operations performed in the IMS system group 50 in order to execute Step S140, Step S240, and Step S340. First, when location registration is requested by receiving a user identifier from the mobile device 10 (step S141), the location registration control unit 510 confirms the presence or absence of service information of the mobile device 10 in the subscriber information management unit 520. Request. This request is made by the location registration control unit 510 transmitting the user identifier to the subscriber information management unit 520 (step S142).

  The subscriber information management unit 520 that has received the user identifier in step S142 identifies the mobile device 10 from the user identifier (step S143), and prohibits location registration release in the subscriber information of the mobile device 10 in step S608 described above. The fact that the fact is registered is canceled (step S144). In response to the request in step S142, the subscriber information management unit 520 has the subscriber information management unit 520 holding service information of the mobile device 10, and the mobile device 10 is prohibited from releasing location registration. A signal representing that is transmitted to the location registration control unit 510 (step S145).

  By receiving the signal in step S145, the location registration control that confirms that the subscriber information management unit 520 holds the service information of the mobile device 10 and that the mobile device 10 is prohibited from canceling the location registration. Unit 510 generates a timer activation signal for reactivating the timer stopped in step S604 (step S146).

  Next, the location registration control unit 510 requests the location registration state monitoring unit 530 to start a timer for canceling location registration. This request is made by transmitting a user identifier and a timer activation signal to the location registration state monitoring unit 530 (step S147).

  The location registration state monitoring unit 530 that has received the user identifier and the timer activation signal in step S147 specifies the mobile device 10 based on the user identifier (step S148), and controls to activate the location registration release timer for the mobile device 10. . That is, when a certain period of time has passed without any periodic location registration from the mobile device 10, the location registration state monitoring unit 530 cancels the location registration for the mobile device 10 (step S149). Next, the location registration state monitoring unit 530 notifies the location registration control unit 510 that step S148 and step S149 have been completed as a response to the request of step S147 (step S150).

  Next, the location registration control unit 510 makes a request related to location registration of the mobile device 10 to the IMS subscriber DB 40. This request is made by transmitting the user identifier and information indicating that the subscriber information management unit 520 has confirmed the service information of the mobile device 10 to the IMS subscriber DB 40 in step S146. (Step S151).

  Returning to FIG. 11, after the IMS subscriber DB 40 requested in relation to location registration in step S <b> 340 makes a determination regarding the area to which the mobile device 10 belongs (step S <b> 440), the mobile device 10 includes the IMS system group 50. The CS subscriber DB 30 is notified that the CS address held by the CS subscriber DB 30 in relation to the mobile device 10 is deleted because of the return to the subordinate (step S540).

  FIG. 13 is a sequence diagram showing in detail an operation performed inside the IMS subscriber DB 40 in order to execute Step S440 and Step S540. First, when receiving a request related to location registration by receiving the user identifier transmitted from the IMS system group 50 in step S151 described above (step s441), the location registration control unit 410 sends a request to the subscriber information management unit 420. It is requested to confirm the subscriber status of the mobile device 10. This request is made by transmitting the user identifier to the subscriber information management unit 420 (step S442).

  The subscriber information management unit 420 that has received the user identifier in step S442 identifies the mobile device 10 based on the user identifier (step S443), and determines that the mobile device 10 is currently in location registration in the IMS network domain. (Step S444), the fact that the information indicating that the release of the location registration of the mobile device 10 is prohibited in Step S406 is cleared (Step S445), and the CS address held in Step S405 is confirmed. (Step S446). Next, the subscriber information management unit 420 responds to the request in step S442 with the CS address confirmed in step S446 that the mobile device 10 is currently registered in the IMS network domain in the determination in step S444. The location registration control unit 410 is notified as a response (step S447).

  Receiving the response in step S447, the location registration control unit 410 determines whether or not the mobile device 10 is in the communication area of the CS network domain. This determination can be performed using the CS address received in step S447, for example. Note that the location registration control unit 410 determines that the mobile device 10 is outside the communication area of the CS network domain because the mobile device 10 has now returned to the IMS network domain to which the mobile device 10 originally belonged from the CS network domain of the movement destination. (Step S448).

  The location registration control unit 410 that has determined that the mobile device 10 is outside the communication area of the CS network domain in step S448 requests the subscriber information management unit 420 to delete the CS address (step S449). . In response to the request in step S449, the subscriber information management unit 420 deletes the CS address (step S450), and transmits a signal indicating the deletion to the location registration control unit 410 as a response to the request in step S449 (step S450). S451).

  Next, since there is no mobile device 10 under the CS system group 20, the location registration control unit 410 deletes the CS address held in association with the mobile device 10 in step S103, for example. The notification unit 430 is requested to notify the DB 30. This request is made by the location registration control unit 410 transmitting a user identifier and a signal indicating deletion of the CS address to the notification unit 430 (step S452).

  Next, the notification unit 430 informs the CS subscriber DB 30 that the CS address held in association with the mobile device 10 in step S103 is deleted because the mobile device 10 does not exist under the CS system group 20. Notice. This notification is performed when the notification unit 430 transmits a user identifier and a signal indicating deletion of the CS address to the CS subscriber DB 30 (step S453).

  Returning to FIG. 11, the CS subscriber DB 30 receiving the signal indicating that the CS address held in association with the mobile device 10 is deleted in step S540 is held in association with the mobile device 10 in step S103. The CS address is deleted (step S640), and the CS system group 20 is notified of canceling the location registration with the mobile device 10 and deleting the service information of the mobile device 10 (step S740).

  FIG. 14 is a sequence diagram showing in detail the operations performed inside CS subscriber DB 30 in order to execute steps S640 and S740. First, upon receiving the user identifier transmitted from the IMS subscriber DB 40 and the signal indicating the deletion of the CS address in step S453 (step S641), the location registration control unit 310 indicates that the CS address is to be deleted. Requests to the information management unit 320. This request is made by transmitting a user identifier and a signal indicating deletion of the CS address to the subscriber information management unit 320 (step S642).

  The subscriber information management unit 320 that has received the user identifier and the signal indicating the deletion of the CS address in step S642 identifies the mobile device 10 from the user identifier (step S643), and the mobile device 10 enters the current CS network domain. After determining that the position is being registered (step S644), for example, the CS address held in association with the mobile device 10 in step S103 is deleted (step S645). Next, the subscriber information management unit 320 notifies the location registration control unit 310 of a signal indicating that steps S643 to S645 have been completed and a CS address as a response to the request of step S642 (step S646).

  Next, since the mobile device 10 does not exist under the CS system group 20, the location registration control unit 310 indicates that the service information downloaded in association with the mobile device 10 in step S100 is deleted, for example. Is notified to the notification unit 330. This request is made by the location registration control unit 310 transmitting the user identifier and the CS address to the notification unit 330 (step S647).

  Next, the notification unit 330 notifies the CS system group 20 that the service information downloaded in association with the mobile device 10 is deleted in step S100, for example, because the mobile device 10 does not exist under the CS system group 20. To do. This notification is performed by the notification unit 330 transmitting the user identifier to the CS system group 20 specified by the CS address (step S648).

  Returning to FIG. 11, in response to the request in step S <b> 340, the IMS subscriber DB 40 determines whether or not the service information of the mobile device 10 needs to be downloaded to the IMS system group 50. Information indicating that the IMS system group 50 has confirmed that the service information of the mobile device 10 is held in the above-described step S151 is transmitted to the IMS subscriber DB 40. It is determined that there is no need to download the service information to the IMS system group 50 (step S840).

  Next, IMS subscriber DB 40 transmits a signal indicating that service information of mobile device 10 is not provided to IMS system group 50 as a response to the request in step S340 (step S940). Next, the IMS system group 50 performs location registration with the mobile device 10 using the service information of the mobile device 10 held by itself (step S1040).

  Then, the effect | action and effect of the communication system 1 concerning this embodiment are demonstrated. According to the communication system 1 of the present embodiment, the communication system 1 includes the mobile device 10, the CS subscriber DB 30, the IMS system group 50, and the IMS subscriber DB 40. When the mobile device 10 is temporarily moved from the IMS network domain to which the mobile device 10 belongs to, for example, overseas roaming, to the CS network domain of the moving destination, for example, for several days, the CS subscriber DB 30 communicates with the mobile device 10. The CS system group 20 is caused to execute location registration. The CS subscriber DB 30 can cause the CS system group 20 to perform location registration by providing the CS system group 20 with, for example, service information necessary for location registration. Then, after the location registration, the CS subscriber DB 30 notifies the IMS subscriber DB 40 that the mobile device 10 is registered and exists under the CS system group 20.

  In this way, the CS subscriber DB 30 notifies the IMS subscriber DB 40 of information related to location registration, so that the IMS subscriber DB 40 can grasp the location registration performed on the CS subscriber DB 30 side. It becomes.

  The IMS subscriber DB 40 notified from the CS subscriber DB 30 that the mobile device 10 exists under the CS system group 20 transmits a release prohibition signal to the IMS system group 50, thereby The IMS system group 50 is prohibited from canceling the location registration already performed with the mobile device 10. That is, the IMS subscriber DB 40 can perform some control on the IMS system group 50 in accordance with the location registration performed on the CS subscriber DB 30 side.

  The IMS system group 50 that has received the release prohibition signal from the IMS subscriber DB 40 continues to hold without removing, for example, service information, which is information necessary for performing location registration with the mobile device 10. As a result, when there is an incoming call to the mobile station 10 that has temporarily moved to the CS network domain due to roaming or the like, or the mobile station 10 that has moved to the CS network domain has returned from the destination to the IMS network domain. In this case, the IMS system group 50 continues to hold, for example, the service information of the mobile device 10 again without downloading it from the IMS subscriber DB 40 in order to perform location registration with the mobile device 10 again. The service information of the mobile device 10 can be reused. As a result, the procedure necessary for performing the download can be omitted, so that the incoming service control procedure for the mobile device 10 during roaming or after returning can be simplified. Further, the communication load between the IMS subscriber DB 40 and the IMS system group 50 can be reduced, and processing pressure on the IMS subscriber DB 40 can be suppressed.

  In the present embodiment, a CS address and a user identifier can be used as a signal indicating that the mobile device 10 exists under the CS system group 20.

  In the present embodiment, the IMS subscriber DB 40 notifies the CS subscriber DB 30 of information related to location registration, so that the CS subscriber DB 30 grasps the location registration performed on the IMS subscriber DB 40 side. It becomes possible.

  In the present embodiment, the CS system group 20 that has received a signal to cancel the location registration with the mobile device 10 reliably cancels the location registration with the mobile device 10 based on the signal. be able to.

1 is a diagram for explaining a configuration of a communication system 1. FIG. 2 is a hardware configuration diagram of a CS subscriber information database server 30, an IMS subscriber information database server 40, and an IMS system group 50. FIG. 2 is a schematic configuration diagram of a CS subscriber information database server 30. FIG. 2 is a schematic configuration diagram of an IMS subscriber information database server 40. FIG. 2 is a schematic configuration diagram of an IMS system group 50. FIG. It is a sequence diagram which shows operation | movement of the communication system 1 when the mobile device 10 is temporarily moved to the CS network domain from the IMS network domain to which it belongs. FIG. 7 is a sequence diagram illustrating in detail an operation performed inside the CS subscriber information database server 30 in order to execute Step S100, Step S200, and Step S300 of FIG. 6. FIG. 7 is a sequence diagram showing in detail an operation performed inside the IMS subscriber information database server 40 in order to execute Step S400 and Step S500 of FIG. 6. FIG. 7 is a sequence diagram showing in detail an operation performed inside the IMS system group 50 in order to execute step S600 and step S700 of FIG. 6. FIG. 10 is a sequence diagram showing an operation of the communication system 1 when there is an incoming call for the mobile device 10 that has temporarily moved to the CS network domain. FIG. 6 is a sequence diagram showing the operation of the communication system 1 when the mobile device 10 returns from the temporarily moved destination CS network domain to the IMS network domain to which it originally belonged. FIG. 12 is a sequence diagram illustrating in detail an operation performed in the IMS system group 50 in order to execute Step S140, Step S240, and Step S340 of FIG. FIG. 12 is a sequence diagram illustrating in detail an operation performed inside the IMS subscriber information database server 40 in order to execute Step S440 and Step S540 of FIG. 11. FIG. 12 is a sequence diagram showing in detail an operation performed within the CS subscriber information database server 30 in order to execute Step S640 and Step S740 of FIG. 11.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... Mobile station, 20 ... CS system group, 30 ... Subscriber information database server for CS, 310 ... Location registration control part, 320 ... Subscriber information management part, 330 ... Notification part, 40 ... For IMS Subscriber information database server, 410 ... Location registration control unit, 420 ... Subscriber information management unit, 430 ... Notification unit, 50 ... IMS system group, 510 ... Location registration control unit, 520 ... Subscriber information management unit, 530 ... Location Registration status monitoring unit.

Claims (9)

Movement for a destination network domain included in a communication system including a mobile device, a source subscriber information database server for a source network domain, and a source call control server for the source network domain A pre-subscriber information database server,
When the mobile device is temporarily moved from the source network domain to which the mobile device belongs to the destination network domain, the destination call control server for the destination network domain registers the location with the mobile device. the information for sending to the destination call control server, after the location registration, and the destination location registration control means for the mobile station to determine whether there is in the communication range of the source network domain,
After the destination location registration control means determines that the mobile station is not within the communication range of the source network domain, the source subscriber is notified that the mobile station exists under the destination call control server. A destination notification means for notifying the information database server;
A destination subscriber information database server characterized by comprising: The destination notification means includes
By transmitting to the source subscriber information database server a signal including mobile destination call control server specifying information for specifying the mobile destination call control server and mobile device specifying information for specifying the mobile device, 2. The destination subscriber information database server according to claim 1, wherein the source subscriber information database server notifies the source subscriber information database server that the mobile unit exists under the destination call control server. The destination location registration control means includes:
When the mobile device returns from the destination network domain to the source network domain, the source subscriber information database server notifies that the mobile device has returned to the source call control server. 2. The destination subscriber information according to claim 1, wherein a signal to cancel the location registration between the destination call control server and the mobile station is transmitted to the destination call control server. Database server. Movement for the source network domain included in a communication system including a mobile device, a destination subscriber information database server for the destination network domain, and a source call control server for the source network domain A former subscriber information database server,
When the mobile device is temporarily moved from the source network domain to which the mobile device belongs to the destination network domain, the mobile device exists under the destination call control server for the destination network domain A source notification means to be notified from the destination subscriber information database server,
In response to the fact that the movement source notification means has been informed, the movement source call control server sends a release prohibition signal to the effect of prohibiting the release of the location registration that has already been performed for the mobile device. A source location registration control means for transmitting to the call control server;
A source subscriber information database server characterized by comprising: The source notification means
By receiving from the destination subscriber information database server a signal including destination call control server specifying information for specifying the destination call control server and mobile unit specifying information for specifying the mobile unit, 5. The source subscriber information database server according to claim 4, wherein the mobile unit is notified that the mobile unit exists under the destination call control server. The source notification means
When the mobile device returns from the destination network domain to the source network domain, the mobile subscriber information database server is notified that the mobile device has returned to the source call control server. 5. The source subscriber information database server according to claim 4. For the source network domain included in a communication system including a mobile device, a destination subscriber information database server for the destination network domain, and a source subscriber information database server for the source network domain The mobile call control server of
A cancellation prohibition signal for prohibiting cancellation of location registration that has already been performed for the mobile device when the mobile device is temporarily moved from the source network domain to which the mobile device belongs to the destination network domain Receiving means for receiving from the source subscriber information database server;
Holding means for continuing to hold information for performing location registration with respect to the mobile device in response to the reception means receiving the release prohibition signal;
A mobile call control server comprising: And the mobile station, and the destination subscriber information database server according to claim 1, the transfer source subscriber information database server according to claim 4, including a mobile Motoko control server according to claim 7 Configured communication system. A mobile station, a destination subscriber information database server for a destination network domain, a source subscriber information database server for a source network domain, and a source call control server for the source network domain A communication method in a configured communication system, comprising:
When the mobile station is temporarily moved from the source network domain to which the mobile station belongs to the destination network domain, the destination location registration control means of the destination subscriber information database server includes the destination network domain A first location registration control step for transmitting information for performing location registration to the mobile device by the mobile destination call control server for use,
The destination notification means of the destination subscriber information database server notifies the source subscriber information database server that the mobile unit exists under the destination call control server after the location registration. One notification step;
A second notification step in which the source notification means of the source subscriber information database server notifies the destination subscriber information database server that the mobile unit exists under the destination call control server;
In response to the fact that the movement source location registration control means of the movement source subscriber information database server is notified of the movement source notification means in the second notification step, the movement source call control server A second location registration control step of transmitting to the mobile call control server a cancellation prohibition signal for prohibiting cancellation of location registration that has already been performed for the machine;
The receiving step of the source call control server receives the release prohibition signal from the source subscriber information database server; and
The holding means of the mobile call control server keeps holding information for performing location registration with respect to the mobile device in response to the reception means receiving the release prohibition signal in the receiving step. Steps,
A communication method comprising:

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