WO2013137035A1 - Communication control device, communication system, and communication control method - Google Patents

Description

COMMUNICATION CONTROL DEVICE, COMMUNICATION SYSTEM, AND COMMUNICATION CONTROL METHOD

The present invention relates to a communication control device, a communication system, and a communication control method that are included in an IP multimedia subsystem according to the Internet protocol and control a voice call of a mobile station.

The IP Multimedia Subsystem (specifically, IP Multimedia Core Network Subsystem (IMS)) defined in the 3rd Generation Partnership Project (3GPP) is an access network including a radio access network (RAN), for example, 3G (W- Regardless of RAT such as CDMA) or Long Term Evolution (LTE), it functions as a platform that realizes communication using Internet Protocol (IP). Such an access network is called IP-Connectivity-Access-Network (IP-CAN), and IMS can seamlessly accommodate a plurality of IP-CANs (for example, Non-Patent Document 1).

FIG. 1 shows a communication sequence in which a mobile station (UE) selects a Proxy-Call Session Control Function (P-CSCF) that constitutes an IMS. As shown in FIG. 1, the UE executes a procedure for setting a bearer, which is a logical communication path for Session 用 Initiation Protocol (SIP) or voice media, as PacketPackData Network Gateway (PGW) (S10). The P-CSCF is selected in the procedure, and the UE holds the address of the selected P-CSCF (S20). Next, the UE transmits SIP REGISTER to the P-CSCF based on the held P-CSCF address (S30).

Fig. 2 shows a communication sequence related to Registration of UE to IMS. As shown in FIG. 2, the P-CSCF relays the SIP REGISTER to the Interrogating -Call Session Control Function (I-CSCF). The I-CSCF acquires the determination result of whether or not the UE is a subscriber and the address of the S-CSCF from the Home Subscriber Server (HSS), and relays the SIP REGISTER to the P-CSCF (S40). Here, when the registration of the UE has already been completed, the address of the held S-CSCF is notified from the HSS to the I-CSCF.

Next, the HSS notifies the subscriber information of the UE to the S-CSCF (S50). The P-CSCF holds the notified subscriber information and the address of the P-CSCF (S60). Here, the P-CSCF overwrites the address of the notified P-CSCF with the held P-CSCF address.

Fig. 3 shows a communication sequence related to Registration to IMS when the UE requests re-registration to IP-CAN. Factors that cause the UE to send a re-registration request include UE RAN transition (eg, LTE to 3G), UE power reset, and restart of the core network including the RAN and P-CSCF.

In such a case, as shown in FIG. 3, as a result of requesting re-registration to IP-CAN, the UE, as a result of another P-CSCF (old P-CSCF) different from the P-CSCF selected before re-registration. A CSCF (new P-CSCF) may be selected (S70). As a result, the Registration procedure shown in FIG. 2 is executed among the UE, the new P-CSCF, and the S-CSCF (S80).

Here, the S-CSCF overwrites the address of the P-CSCF as described above, that is, overwrites the address of the old P-CSCF holding the address of the new P-CSCF (see S60). For this reason, the old P-CSCF continues to hold subscriber information related to the UE even after re-registration of the UE (S90).

3GPP TS23.401 V11.0.0, Technical Specification Group Services and System Aspects; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (Release 11), 2011

However, the conventional communication sequence described above has the following problems. That is, even if the UE requests re-registration to the IP-CAN and another P-CSCF different from the old P-CSCF is selected, the old P-CSCF keeps the subscriber information related to the UE. The old P-CSCF has a problem in that resources (memory and processor) are wasted even though it is not already used for the voice call of the UE.

Therefore, the present invention has been made in view of such a situation, and even when the mobile station (UE) requests re-registration to the IP multimedia subsystem (IMS) for some reason, the old P-CSCF It is an object of the present invention to provide a communication system, a communication control apparatus, and a communication control method that can suppress IMS resource waste due to continued retention of subscriber information.

A first feature of the present invention is a communication control apparatus that is included in an IP multimedia subsystem according to the Internet protocol and controls a voice call of a mobile station, and the mobile station is connected with the establishment of the voice call. Acquire a registration request of the mobile station including an address of a proxy communication control device that relays control information to be transmitted / received, and execute a registration process of subscriber information associated with the mobile station based on the acquired registration request A registration processing unit;
An address holding unit that holds an address of the proxy communication control device acquired by the registration processing unit;
When the registration processing unit acquires the registration request, if the address holding unit holds the address of the proxy communication control device, the address of the proxy communication control device held by the address holding unit is set. And a deletion request transmission unit that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control device.

A second feature of the present invention is included in an IP multimedia subsystem according to the Internet protocol, and a communication control device that controls a voice call of a mobile station, and the mobile station transmits and receives when the voice call is established A communication system including a proxy communication control device that relays control information, wherein the communication control device acquires a registration request of the mobile station including an address of the proxy communication control device, and based on the acquired registration request A registration processing unit that executes registration processing of subscriber information associated with the mobile station, an address holding unit that holds the address of the proxy communication control device acquired by the registration processing unit, and the registration processing unit When the registration request is acquired, if the address holding unit holds the address of the proxy communication control device, it is held by the address holding unit A deletion request transmission unit that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control device based on an address of the proxy communication control device, wherein the proxy communication control device is the communication control device The gist of the present invention is to provide an information deletion unit that deletes the subscriber information based on the deletion request transmitted from the mobile phone.

A third feature of the present invention is included in an IP multimedia subsystem according to the Internet protocol, and a communication control device that controls a voice call of a mobile station, and the mobile station transmits and receives when the voice call is established A communication control method using a proxy communication control device that relays control information, wherein the communication control device acquires a registration request of the mobile station including an address of the proxy communication control device, and the acquired registration request A step of performing registration processing of subscriber information associated with the mobile station based on the above, a step in which the communication control device holds the acquired address of the proxy communication control device, and the communication control device, When the address of the proxy communication control device is held when the registration request is acquired, based on the address of the proxy communication control device held, Transmitting a deletion request for requesting deletion of the subscriber information to the proxy communication control apparatus to which an address of the proxy communication control apparatus is assigned; and the proxy communication control apparatus is transmitted from the communication control apparatus And a step of deleting the subscriber information based on the deletion request.

FIG. 1 is a diagram illustrating a communication sequence (conventional example) in which a mobile station (UE) selects a Proxy-Call-Session-Control-Function (P-CSCF) constituting an IMS. FIG. 2 is a diagram illustrating a communication sequence (conventional example) related to Registration of UE to IMS. FIG. 3 is a diagram illustrating a communication sequence related to Registration to IMS when the UE requests re-registration to IP-CAN (conventional example). FIG. 4 is an overall schematic configuration diagram of the mobile communication system according to the embodiment of the present invention. FIG. 5 is a functional block configuration diagram of the communication control device and the proxy communication control device according to the embodiment of the present invention. FIG. 6 is a diagram showing a communication sequence related to Registration of the UE to the IMS according to the first embodiment of the present invention. FIG. 7 is a diagram showing a communication sequence related to Registration to IMS via 3G of UE according to the second embodiment of the present invention. FIG. 8 is a diagram showing a communication sequence related to Registration to IMS via the LTE of the UE according to the second embodiment of the present invention. FIG. 9 is an operation flow of the communication control apparatus according to the second embodiment of the present invention.

Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

Therefore, specific dimensions should be determined in consideration of the following explanation. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[First Embodiment]
(1) Overall Schematic Configuration of Mobile Communication System FIG. 4 is an overall schematic configuration diagram of the mobile communication system 10 according to the present embodiment. As shown in FIG. 4, the mobile communication system 10 includes a mobile station 100 (hereinafter referred to as UE 100), an IP-Connectivity Access Network 200 (hereinafter referred to as IP-CAN 200), and an IP Multimedia core network Subsystem 300 (hereinafter referred to as IMS 300). The

In this embodiment, the UE 100 can execute wireless communication according to the Long Term Evolution (LTE) and 3G (W-CDMA) systems. UE 100 can be connected to IP-CAN 200 according to LTE or 3G. Moreover, UE100 performs Registration of UE100 to IMS300 via IP-CAN200. For example, the UE 100 can perform registration of the UE 100 to the IMS 300 according to the Registration procedure defined in Section 5.1.1.1 or L3.1.2 of 3GPP TS24.229.

IP-CAN200 is an access network according to the Internet Protocol (IP). Specifically, the IP-CAN 200 is a network that provides a Session Initiation Protocol (SIP) and audio media transport function, and corresponds to an LTE / Evolved Packet Core (EPC) network in this embodiment.

IP-CAN200 includes Mobility Management Entity (MME), Serving Gateway (SGW), Packet Data Network Gateway (PGW), Policy and Charging Rules Function (PCRF), and SGSN (Serving GPRS Support Node).

MME is an exchange that accommodates eNodeB (radio base station) and provides mobility control and bearer control functions. The SGW is a visited packet switch that accommodates a 3GPP (LTE) access system. The PGW is a connection point with the IMS platform, and is a packet switch that performs IP address assignment and packet transfer to the SGW. The PGW performs QoS control, bearer setting control, and the like in cooperation with the PCRF. The PCRF is a logical node that executes control for QoS and charging for user data transfer. SGSN is a packet switch that accommodates a UTRAN (3G) access system.

IMS300 is a multimedia subsystem according to the Internet protocol. Serving-Call Session Control Function 310 (hereinafter S-CSCF 310), Proxy-Call Session Control Function (P-CSCF 320), Interrogating -Call Session Includes Control Function (I-CSCF), Application Server (AS), and Home Subscriber Server (HSS).

P-CSCF is a SIP relay server located at the connection point with EPC. In addition to SIP transfer, P-CSCF is linked with EPC (PCRF) to activate QoS control and is set on IP-CAN200. It has a function of recognizing the state of IP-CAN Bearer (SIP bearer), which is a logical communication path for SIP and voice media. The IMS 300 is connected to another network (such as a fixed telephone network).

(2) Functional Block Configuration of Communication System Next, functional block configurations of the S-CSCF 310 and the P-CSCF 320 that configure the communication system in the present embodiment will be described. 5A is a functional block configuration diagram of the S-CSCF 310, and FIG. 5B is a functional block configuration diagram of the P-CSCF 320.

(2.1) S-CSCF 310
In the present embodiment, the S-CSCF 310 constitutes a communication control apparatus that controls the voice call of the UE 100. As illustrated in FIG. 5A, the S-CSCF 310 includes a registration processing unit 311, an address holding unit 313, and a deletion request transmission unit 315.

The registration processing unit 311 performs registration processing of subscriber information (such as IMSI) associated with the UE 100. In particular, in the present embodiment, the registration processing unit 311 displays a SIP REGISTER including an address of the P-CSCF 320 that relays control information such as various messages according to the SIP transmitted and received by the UE 100 when the voice call of the UE 100 is established. Obtained from P-CSCF 320.

In addition, the registration processing unit 311 executes a registration process of subscriber information associated with the UE 100 based on the acquired SIP REGISTER. Specifically, the registration processing unit 311 executes a registration process for the subscriber information based on the subscriber information notified from the HSS configuring the IMS 300.

The registration processing unit 311 may determine whether or not the UE 100 is a valid subscriber based on the acquired SIP REGISTER and subscriber information. In addition, when the UE 100 needs to register to the IMS 300 due to some factor (for example, RAN transition of the UE), the registration processing unit 311 sends the SIP 100 REGISTER (re-registration request) of the UE 100 to the UE 100. The deletion request transmission unit 315 may be notified of the content of the acquired re-registration request.

The address holding unit 313 holds an address (specifically, an IP address) of the P-CSCF 320. In particular, in the present embodiment, the address holding unit 313 holds the IP address of the P-CSCF card 320 acquired by the registration processing unit 311.

When the registration processing unit 311 acquires the registration request, the deletion request transmission unit 315, when the address holding unit 313 holds the address of the P-CSCF 320, the P-CSCF held by the address holding unit 313. Based on the address of 320, a Deregistration request for requesting deletion of the subscriber information of the UE 100 is transmitted to the P-CSCF 320 to which the address is assigned.

If the address of the P-CSCF 320 included in the registration request acquired by the registration processing unit 311 is different from the address of the P-CSCF 320 held by the address holding unit 313, the deletion request transmission unit 315 Based on the address of the P-CSCF-320 held in 313, the Deregistration request may be transmitted to the P-CSCF-320 to which the address is assigned.

The deletion request transmission unit 315 may transmit a Deregistration request to the P-CSCF 320 when the registration processing unit 311 determines that the UE 100 is a valid subscriber. Further, the deletion request transmission unit 315 has a capability of terminating a message (control information) in accordance with SIP, specifically, when the P-CSCF 320 has a function of SIP Agent, -A Deregistration request may be sent to CSCF 320. In particular, it may be preferable to send a Deregistration request to the P-CSCF 320 only when the P-CSCF 320 has a SIP Agent function. In other words, the P-CSCF 320 that has received the deregistration request can terminate the message in accordance with SIP, and thus the UE 100 is not affected by the transmission of the deregistration request.

In addition, the deletion request transmission unit 315 determines the access network (specifically, LTE) to which the UE 100 was connected before the re-registration request, and sends it to the P-CSCF 320 associated with the determined access network A Deregistration request may be sent.

(2.2) P-CSCF 320
In the present embodiment, the P-CSCF 320 constitutes a proxy communication control device that relays control information transmitted and received by the UE 100 in accordance with the establishment of a voice call by the UE 100. As shown in FIG. 5B, a deletion request receiving unit 321, an information deleting unit 323, and an information holding unit 325 are provided.

The deletion request receiving unit 321 receives the Deregistration request from the S-CSCF 310 and notifies the information deleting unit 323 of the received Deregistration request.

The information deletion unit 323 deletes the held UE100 subscriber information based on the deregistration request transmitted from the S-CSCF 310. Specifically, the information deletion unit 323 clears the subscriber profile (Registration state) of the UE 100 held by the information holding unit 325.

(3) Operation of Communication System Next, the operation of the mobile communication system 10 described above will be described. Specifically, an operation in which the S-CSCF 310 transmits a deregistration request to the P-CSCF 320 in response to the UE 100 SIP REGISTER (registration request) will be described.

FIG. 6 is a diagram illustrating a sequence related to Registration of UE to IMS. The operations in steps S50 and S60 shown in FIG. 6 are the same as those in the conventional example shown in FIG. Further, the “S-CSCF address specifying procedure” shown in FIG. 6 is the same as the operation of step S40 shown in FIG. 2, and therefore detailed description thereof is omitted here.

S-CSCF 310 (S-CSCF in the figure) holds the subscriber information based on the subscriber information of UE100 notified from HSS in step S50, and also sends it to SIP REGISTER relayed from I-CSCF. The address of the included P-CSCF (specifically, the new P-CSCF) is overwritten. That is, the S-CSCF 310 overwrites the address of the new P-CSCF on the address of the old P-CSCF held in the address holding unit 313 (S60). Note that the address of the old P-CSCF was retained when the UE 100 previously transmitted SIP REGISTER to the IMS 300.

Next, the S-CSCF 310 transmits a deregistration request to the old P-CSCF based on the address of the old P-CSCF held in the address holding unit 313 (S110).

The old P-CSCF (P-CSCF 320) that has received the deregistration request deletes the subscriber information (S120). Specifically, the old P-CSCF clears the subscriber profile (Registration state) of the UE 100 that it holds.

(4) Operation / Effect According to the mobile communication system 10 described above, when the S-CSCF 310 obtains the SIP REGISTER from the UE 100, if the P-CSCF 320 address is already held, the stored P Based on the address of -CSCF 320 (old P-CSCF), a Deregistration request is sent to the P-CSCF requesting deletion of the subscriber information of UE100. In addition, the P-CSCF 320 that has received the deregistration request promptly deletes the held subscriber information of the UE 100.

For this reason, although the old P-CSCF is not already used for the voice call of the UE 100, the problem of wasteful consumption of resources (memory and processor) can be reliably solved. That is, according to the mobile communication system 10, even when the UE 100 requests re-registration to the IMS 300 for some reason, it is possible to suppress the resource waste of the IMS 300 due to the retention of subscriber information in the old P-CSCF. .

In this embodiment, if the address of the P-CSCF 320 included in the SIP REGISTER is different from the address of the stored P-CSCF 320, the address is stored based on the stored P-CSCF 320 address. The deregistration request is transmitted to the P-CSCF 320 to which the address of the assigned P-CSCF 320 is assigned. For this reason, in the unlikely event that the addresses are the same, transmission of the deregistration request is avoided, so that waste of resources of the IMS 300 can be suppressed while securing the voice call of the UE 100 more reliably.

Note that the communication protocol used between CSCFs is based on an IP-based autonomous network, and a specific device (S-CSCF 310) is held by another device (P-CSCF 320). In general, an operation for actively deleting the information is not performed. In addition, frequent transmission of control information such as a deregistration request has conventionally tended to be avoided due to restrictions on network resources (communication bandwidth, etc.).

In the above-described embodiment, it is assumed that the network has become wideband in recent years, and the entries held by other devices (P-CSCF 320) that are not used actively in the conventional autonomous network. It is meaningful that the waste of resources (memory and processor) of the device is positively suppressed by defining an operation that actively deletes the above information.

In the above-described embodiment, when the UE 100 is determined to be a valid subscriber, a Deregistration request is transmitted to the P-CSCF 320. Further, when the P-CSCF 320 has a SIP AGENT function, a Deregistration request is transmitted to the P-CSCF 320. For this reason, it is possible to prevent the subscriber information of the UE 100 held by the P-CSCF 320 from being deleted by inadvertently transmitting a Deregistration request.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In this embodiment, an operation example of the communication system when the UE 100 moves from LTE to 3G (handover or the like) and when the UE 100 moves from 3G to LTE will be described. Hereinafter, parts different from the above-described first embodiment of the present invention will be mainly described, and description of the same parts will be appropriately omitted.

(1) Operation Sequence FIG. 7 is a diagram showing a sequence related to Registration to IMS via 3G of UE 100 according to the present embodiment. Specifically, FIG. 7 shows a sequence when the UE 100 completes registration (attachment) to LTE and then transitions to 3G (for example, handover) and attaches to 3G.

As shown in FIG. 7, when the UE 100 attaches to LTE, the S-CSCF 310 (S-CSCF in the figure) holds the address (IP address) of the P-CSCF that relays the SIP REGISTER (S210).

Next, the UE 100 transitions from LTE to 3G, and performs attachment to 3G with CircuitCSwitching Gateway (CS-GW) (S220). The CS-GW is a 3G radio access accommodating device that accommodates a 3G RAN and executes 3G authentication and mobility control.

S-CSCF 310 holds the address (IP address) of CS-GW that relayed SIP REGISTER (S220). Specifically, the S-CSCF 310 overwrites the address of the CS-GW on the address of the P-CSCF held in step S210.

Also, the S-CSCF 310 sends a delete request to the P-CSCF based on the held P-CSCF address (S230). The deletion request may be a deregistration request similar to that in the first embodiment, or a message such as “NOTIFY” may be used.

The P-CSCF that has received the deletion request deletes the subscriber information (S240). Specifically, the P-CSCF clears the subscriber profile (Registration state) of the UE 100 that it holds.

FIG. 8 is a diagram showing a sequence related to Registration to IMS via LTE of UE 100 according to the present embodiment. Specifically, FIG. 8 shows a sequence when the UE 100 completes registration (attachment) to 3G, transitions to LTE (for example, handover), and attaches to LTE.

The operations in steps S310 to S340 shown in FIG. 8 are substantially the same as the operations in steps S210 to S240 shown in FIG. In steps S330 and S340, the CS-GW executes the operation instead of the P-CSCF.

(2) Operation Flow of Communication Control Device FIG. 9 is an operation flow of the S-CSCF 310 (communication control device) according to the present embodiment. As shown in FIG. 9, the S-CSCF 310 receives a SIP REGISTER from the P-CSCF 320 or CS-GW (S410).

The S-CSCF 310 executes a registration procedure for the P-CSCF 320 or CS-GW and the normal UE 100 IMS 300 based on the received SIP REGISTER (S420).

Next, the S-CSCF 310 determines whether or not the UE 100 is already in the registration state (S430). Here, it is assumed that UE 100 is already in the Registration state in either P-CSCF or CS-GW. If neither the P-CSCF nor CS-GW is in the Registration state, the S-CSCF 310 terminates the operation flow.

If the CS-GW is in the Registration state, that is, if the UE 100 has previously attached to 3G and registered with the IMS 300, a deletion request (Deregistration request) is transmitted to the CS-GW (S440). On the other hand, when the UE is in the Registration state in the P-CSCF, that is, when the UE 100 has previously attached to the LTE and registered in the IMS 300, a deletion request (Deregistration request) is transmitted to the P-CSCF (S450).

As described above, even when the UE moves to a radio access network (RAN) connected to the UE 100, the subscriber information of the UE 100 may be retained in the P-CSCF or CS-GW. According to the form, even in such a case, it can be avoided that the state in which the subscriber information of the UE 100 that is not already used in the P-CSCF or CS-GW is held is maintained.

[Other Embodiments]
As described above, the contents of the present invention have been disclosed through the first and second embodiments of the present invention. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. Absent. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

For example, in the first and second embodiments described above, an example in which an IP address is used as an address such as P-CSCF has been described. However, an IP address is not necessarily an IP address as long as it can uniquely identify a P-CSCF or the like. It doesn't matter.

In the second embodiment described above, LTE (E-UTRAN) and 3G (UTRAN) are described as examples. However, for example, 2G (GERAN) may be used instead of 3G.

Also, the above-described CS-GW (proxy communication control device) may be a device called “MSC enhanced for ICS”.

Note that the present invention described above may be expressed as follows. A first feature of the present invention is S-CSCF 310 (communication control device) included in IMS 300 (IP multimedia subsystem) according to the Internet protocol, which controls a voice call of a mobile station. Acquired SIP REGISTER (registration request for the mobile station) including the address of P-CSCF 320 or CS-GW (proxy communication control device) that relays control information sent and received by the mobile station A registration processing unit 311 that executes registration processing of subscriber information associated with the mobile station based on the registration request, and an address holding unit 313 that holds the address of the proxy communication control apparatus acquired by the registration processing unit And when the registration processing unit acquires the registration request, if the address holding unit holds the address of the proxy communication control device, the proxy communication held by the address holding unit A deletion request transmission unit 315 that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control device to which the address of the proxy communication control device is assigned based on the address of the control device. The gist.

In the first aspect of the present invention described above, the deletion request transmission unit includes an address of the proxy communication control device included in the registration request, and an address of the proxy communication control device held by the address holding unit. Are different from each other, the proxy communication control device to which the address of the proxy communication control device held by the address holding unit is assigned based on the address of the proxy communication control device held by the address holding unit The deletion request may be transmitted to

In the first aspect of the present invention described above, the registration processing unit determines whether or not the mobile station is a valid subscriber, and the deletion request transmitting unit is configured so that the mobile station When it is determined that the subscriber is a valid subscriber, the deletion request may be transmitted to the proxy communication control device.

In the first aspect of the present invention described above, the deletion request transmission unit may transmit the deletion request to the proxy communication control device when the proxy communication control device has a capability of terminating the control information. .

In the first aspect of the present invention described above, the registration processing unit acquires a re-registration request for the mobile station from the mobile station, and the deletion request transmission unit is configured so that the mobile station receives the re-registration request before The connected access network may be determined, and the deletion request may be transmitted to the proxy communication control device associated with the determined access network.

A second feature of the present invention is included in an IP multimedia subsystem according to the Internet protocol, and a communication control device that controls a voice call of a mobile station, and the mobile station transmits and receives when the voice call is established A communication system including a proxy communication control device that relays control information, wherein the communication control device acquires a registration request of the mobile station including an address of the proxy communication control device, and based on the acquired registration request A registration processing unit that executes registration processing of subscriber information associated with the mobile station, an address holding unit that holds the address of the proxy communication control device acquired by the registration processing unit, and the registration processing unit When the registration request is acquired, if the address holding unit holds the address of the proxy communication control device, it is held by the address holding unit A deletion request transmission unit that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control device based on an address of the proxy communication control device, wherein the proxy communication control device is the communication control device The gist of the present invention is to include an information deletion unit 323 that deletes the subscriber information based on the deletion request transmitted from the terminal.

A third feature of the present invention is included in an IP multimedia subsystem according to the Internet protocol, and a communication control device that controls a voice call of a mobile station, and the mobile station transmits and receives when the voice call is established A communication control method using a proxy communication control device that relays control information, wherein the communication control device acquires a registration request of the mobile station including an address of the proxy communication control device, and the acquired registration request A step of performing registration processing of subscriber information associated with the mobile station based on the above, a step in which the communication control device holds the acquired address of the proxy communication control device, and the communication control device, When the address of the proxy communication control device is held when the registration request is acquired, based on the address of the proxy communication control device held, Transmitting a deletion request for requesting deletion of the subscriber information to the proxy communication control apparatus to which an address of the proxy communication control apparatus is assigned; and the proxy communication control apparatus is transmitted from the communication control apparatus And a step of deleting the subscriber information based on the deletion request.

Thus, it goes without saying that the present invention includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the appropriate claims from the above description.

Note that the entire content of Japanese Patent Application No. 2012-058597 (filed on March 15, 2012) is incorporated herein by reference.

According to the feature of the present invention, even when the mobile station (UE) requests re-registration to the IP multimedia subsystem (IMS) for some reason, the subscriber information is continuously retained in the old P-CSCF. It is possible to provide a communication control device, a communication system, and a communication control method capable of suppressing IMS resource waste due to the above.

10 ... Mobile communication system 100 ... UE
200 ... IP-CAN
300 ... IMS
310 ... S-CSCF
311 ... Registration processing unit 313 ... Address holding unit 315 ... Deletion request sending unit 320 ... P-CSCF
321 ... Deletion request receiving unit 323 ... Information deleting unit 325 ... Information holding unit

Claims (7)

A communication control device for controlling a voice call of a mobile station included in an IP multimedia subsystem according to the Internet protocol,
Acquires a registration request of the mobile station including an address of a proxy communication control device that relays control information transmitted and received by the mobile station with the establishment of the voice call, and responds to the mobile station based on the acquired registration request A registration processing unit for performing registration processing of the attached subscriber information;
An address holding unit that holds an address of the proxy communication control device acquired by the registration processing unit;
When the registration processing unit acquires the registration request, if the address holding unit holds the address of the proxy communication control device, the address of the proxy communication control device held by the address holding unit is set. And a deletion request transmission unit that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control apparatus to which the address of the proxy communication control apparatus is assigned. The deletion request transmission unit is held by the address holding unit when the address of the proxy communication control device included in the registration request is different from the address of the proxy communication control device held by the address holding unit. The communication control device according to claim 1, wherein the deletion request is transmitted to the assigned proxy communication control device that is held by the address holding unit but is assigned based on an address of the proxy communication control device. The registration processing unit determines whether the mobile station is a valid subscriber,
The communication control device according to claim 1, wherein the deletion request transmission unit transmits the deletion request to the proxy communication control device when the registration processing unit determines that the mobile station is a valid subscriber. The communication control device according to claim 1, wherein the deletion request transmission unit transmits the deletion request to the proxy communication control device when the proxy communication control device has a capability of terminating the control information. The registration processing unit obtains a re-registration request for the mobile station from the mobile station,
The deletion request transmission unit determines an access network to which the mobile station was connected before the re-registration request, and transmits the deletion request to the proxy communication control device associated with the determined access network The communication control device according to claim 1. A communication control device for controlling a voice call of a mobile station, included in an IP multimedia subsystem according to the Internet protocol;
A communication system including a proxy communication control device that relays control information transmitted and received by the mobile station with the establishment of the voice call,
The communication control device includes:
A registration processing unit that acquires a registration request of the mobile station including an address of the proxy communication control device, and executes a registration process of subscriber information associated with the mobile station based on the acquired registration request;
An address holding unit that holds an address of the proxy communication control device acquired by the registration processing unit;
When the registration processing unit acquires the registration request, if the address holding unit holds the address of the proxy communication control device, the address of the proxy communication control device held by the address holding unit is set. And a deletion request transmission unit that transmits a deletion request for requesting deletion of the subscriber information to the proxy communication control device,
The proxy communication control device is a communication system including an information deletion unit that deletes the subscriber information based on the deletion request transmitted from the communication control device. A communication control device for controlling a voice call of a mobile station, included in an IP multimedia subsystem according to the Internet protocol;
A communication control method using a proxy communication control device that relays control information transmitted and received by the mobile station with the establishment of the voice call,
The communication control apparatus acquires a registration request of the mobile station including an address of the proxy communication control apparatus, and executes a registration process of subscriber information associated with the mobile station based on the acquired registration request Steps,
The communication control device holds the acquired address of the proxy communication control device;
When the communication control device holds the address of the proxy communication control device when the registration request is acquired, the proxy communication control device is configured based on the held address of the proxy communication control device. Transmitting a deletion request for requesting deletion of the subscriber information to the proxy communication control device to which an address is assigned;
The proxy communication control device includes a step of deleting the subscriber information based on the deletion request transmitted from the communication control device.

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