JP5626166B2 - Mobile communication method, mobile communication system, mobile station communication method, mobile station, control node control method, and control node - Google Patents

Description

  The present invention relates to a mobile communication method and a mobile communication system.

  Conventionally, 2G / 3G radio access network (UTRAN: Universal Terrestrial Radio Access Network, or GERAN: GSM EDGE Radio Access Network) and LTE (Long Term Evolve UTR) EvUlV eV A mobile communication system capable of accommodating a terrestrial radio access network is known.

  In 3GPP TS23.216, a route for voice communication between UE (User Equipment) # 1 and UE # 2 is changed from a route via E-UTRAN or UTRAN (route for VoIP (Voice over IP) communication). The “SRVCC (Single Radio Voice Call Continuity) method” that switches to a route (route for circuit switching (CS) communication) via UTRAN / GERAN is defined (see Non-Patent Document 1).

  Further, in Alt.4 and Alt.11 of 3GPP TR23.856 v0.4.1, etc., UE # 1 and UE # 2 are set with MGW (Media Gateway) # 1 in the visited network of UE # 1 as an anchor point. SRVCC method (hereinafter referred to as SRVCC improvement method) is defined to switch the route for voice communication to and from the route via E-UTRAN to the route via UTRAN / GERAN (see Non-Patent Document 2). ).

  According to the SRVCC improvement method, a signal necessary for switching a voice communication path between UE # 1 and UE # 2 can be terminated in the visited network of UE # 1, Compared with the SRVCC scheme, it is possible to shorten the communication interruption time caused by the round trip between the visited network of UE # 1 and the home network of UE # 1 of the signal.

  Hereinafter, with reference to FIG. 7, a procedure for setting a route for voice communication between UE # 1 and UE # 2 will be described.

  As shown in FIG. 7, in step 1, UE # 1 transmits “INVITE” to a P-CSCF (Proxy-Call Session Control Function) / VATF (Visited Access Transfer Function).

  In step 2, the P-CSCF / VATF assigns MGW # 1 to the route.

  Furthermore, “eSRVCC” indicating that the identification information of MGW # 1 and the SRVCC improvement method can be used for the I / S-CSCF (Intermission / Serving-Call Session Control Function) by the P-CSCF / VATF. “INVITE” including is transmitted.

  In Step 3, the I / S-CSCF transmits “INVITE” including “eSRVCC” to an SCC AS (Service Centralization and Continuity Application Server).

  In step 4, the SCC AS transmits “INVITE” to the I / S-CSCF, and in step 5, the I / S-CSCF transmits “INVITE” to the UE # 2.

  In Step 6, UE # 2 transmits “200 OK (response signal to“ INVITE ”)” to the I / S-CSCF. In Step 7, the I / S-CSCF transmits to the SCC AS. , "200 OK" is transmitted, and in step 8, the SCC AS transmits "200 OK" to the I / S-CSCF. In step 9, the I / S-CSCF transmits the P-CSCF / VATF. In step 10, the P-CSCF / VATF transmits “200 OK” to UE # 1.

  As a result, a signaling path for voice communication between UE # 1 and UE # 2 is set between UE # 1, P-CSCF / VATF, I / S-CSCF, and UE # 2. A media signal path for voice communication between 1 and UE # 2 is set among UE # 1, MGW # 1, and UE # 2.

3GPP TS 23.216 3GPP TR23.856 v0.4.1

  However, in the procedure shown in FIG. 3, MGW # 1 is allocated even when the UE cannot use the SRVCC improvement method, such as when UE # 1 does not support the SRVCC method. There was a problem of consuming unnecessary resources.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a mobile communication method and a mobile communication system that can prevent waste of resources of MGW # 1.

A first feature of the present invention includes a first radio access network that does not support circuit-switched communication and a second radio access network that supports circuit-switched communication, and the presence of the first mobile station. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. A mobile communication method in a mobile communication system that can use a switching method for switching to a mobile communication system, wherein the first mobile station has a capability of the first mobile station with respect to a first session control node in the visited network. Including a step of transmitting a session start request signal including the first session control node, the service control network And transmitting a session start request signal including a force, a step of the service control network, based on the ability of the first mobile station, determining whether to transmit an allocation request signal of the predetermined node,
The first session control node has a step of allocating the predetermined node based on the allocation request signal received from the service control network.

  A second feature of the present invention includes a first radio access network that does not support circuit-switched communication and a second radio access network that supports circuit-switched communication, and the presence of the first mobile station. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. A mobile communication method in a mobile communication system that can use a switching method to switch to the first session control node in the visited network in a registration procedure for the service control network, Notifying the capability of the first mobile station, and the first mobile station to the first session control node. And a first session control node determining whether to allocate the predetermined node based on the capability of the first mobile station. .

  A third feature of the present invention includes a first radio access network that does not support circuit-switched communication and a second radio access network that supports circuit-switched communication, and the presence of the first mobile station. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. A mobile communication method in a mobile communication system that can use a switching method for switching to a mobile communication system, wherein the first mobile station has a capability of the first mobile station for the service control network in a registration procedure for the service control network. Notifying, and the first mobile station transmits a session start request signal to the first session control node The first session control node transmits a session start request signal to the service control network, and the service control network determines the predetermined node based on the capability of the first mobile station. Determining whether or not to transmit the allocation request signal, and the first session control node allocating the predetermined node based on the allocation request signal received from the service control network. The gist.

  According to a fourth aspect of the present invention, there is provided a first radio access network that does not support circuit-switched communication and a second radio access network that supports circuit-switched communication. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. The first communication control node in the visited network transmits a session start request signal including the capability of the first mobile station from the first mobile station. When received, it is configured to transmit a session start request signal including the capability of the first mobile station to the service control network. The service control network is configured to determine whether to transmit an allocation request signal for the predetermined node based on the capability of the first mobile station, and the first session control node The gist of the invention is that the predetermined node is allocated based on the allocation request signal received from the service control network.

  A fifth feature of the present invention includes a first radio access network that does not support circuit switched communication and a second radio access network that supports circuit switched communication, and the presence of the first mobile station. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. The first session control node in the visited network can use the first mobile station's capability in a registration procedure for the service control network of the first mobile station. Is acquired and stored, and the first session control node receives a session start request from the first mobile station. When receiving a signal, based on the ability of the first mobile station, and summarized in that the it is configured to determine whether allocating a predetermined node.

  According to a sixth aspect of the present invention, there is provided a first radio access network that does not support circuit-switched communication and a second radio access network that supports circuit-switched communication. The voice communication path between the first mobile station and the second mobile station is routed from the path via the first radio access network to the path via the second radio access network at a predetermined node in the service area network. The service control network can acquire and store the capability of the first mobile station in a registration procedure of the first mobile station with respect to the service control network. The service control network receives a session start request signal transmitted by the first mobile station. The first session control node is configured to determine whether to transmit an allocation request signal for the predetermined node based on the capability of the first mobile station. The gist is that the predetermined node is allocated based on the allocation request signal received from the network.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a mobile communication system capable of preventing waste of resources of MGW # 1.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention. It is a sequence diagram explaining operation | movement of the mobile communication system which concerns on the modification 1 of this invention. It is a sequence diagram explaining operation | movement of the mobile communication system which concerns on the modification 1 of this invention. It is a sequence diagram explaining operation | movement of the mobile communication system which concerns on the modification 2 of this invention. It is a sequence diagram explaining operation | movement of the mobile communication system which concerns on the modification 2 of this invention. It is a sequence diagram explaining operation | movement of the conventional mobile communication system.

(Mobile communication system according to the first embodiment of the present invention)
With reference to FIG.1 and FIG.2, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  The mobile communication system according to the present embodiment accommodates E-UTRAN and UTRAN / GERAN.

  Specifically, as illustrated in FIG. 1, the mobile communication system according to the present embodiment includes an eNB (Radio Base Station), an RNC (Radio Network Controller, a radio network controller) in a visited network of UE # 1. NodeB (wireless base station), BSS (not shown), MME (Mobility Management Entity, mobility management node), S-GW (Serving-Gateway, serving gateway device), P-GW (PDN-Gateway) PDN gateway device), DHCP (Dynamic Host Configuration Protocol) server, P-CSCF / VATF, MGW # 1, MSC (Mobile-service Switching Center), circuit switching Machine), SGSN (Serving GPRS Support Node, packet switch), MSC server, MGW # 2, and the like.

  Here, the P-CSCF and the VATF may be provided in the same device, or may be provided in separate devices. In addition, the VATF may be provided in a device such as a P-GW, an S-GW, or an IBCF (Interconnection Border Control Function (not shown) described in TS23.228).

  The mobile communication system according to the present embodiment includes an SCC AS, an I / S-CSCF, and the like in the home network of UE # 1.

  Here, in the mobile communication system according to the present embodiment, the route for voice communication between UE # 1 and UE # 2 is routed via E-UTRAN or UTRAN (IMS) by the SRVCC method or the SRVCC improvement method. It is possible to switch from a route for VoIP communication) to a route via UTRAN / GERAN (route for circuit-switched communication).

  Hereinafter, with reference to FIG. 2, a procedure for setting a voice communication path between UE # 1 and UE # 2 will be described.

  As shown in FIG. 2, in step S1001, UE # 1 transmits “INVITE” including SRVCC capability indicating whether UE # 1 supports the SRVCC scheme to P-CSCF / VATF.

  In step S1002, the P-CSCF / VATF sets “eSRVCC” indicating that the SRVCC improvement method can be used for the I / S-CSCF in the IMS (IP Multimedia Subsystem) and “INVITE” including the SRVCC capability. Send.

  In step S1003, the I / S-CSCF determines the subscriber profile of UE # 1 managed by the HSS (Home Subscriber Server), the SRVCC capability included in the received “INVITE”, the home of UE # 1 Whether or not the SRVCC improvement method should be used is determined according to the policy of the network or the visited network, and in step S1004, “INVITE” including “eSRVCC” indicating the determination result is displayed for the SCC AS in the IMS. Send.

  In step S1005, the SCC AS transmits “INVITE” including the MGW # 1 allocation request signal to the I / S-CSCF. Note that the MGW # 1 assignment request signal may not be included in this signal.

  In step S1006, the I / S-CSCF transmits “INVITE” including the allocation request signal to the P-CSCF / VATF.

  In step S1007, the P-CSCF / VATF allocates MGW # 1 based on the allocation request signal, and transmits “INVITE” to the I / S-CSCF in step S1008.

  In step S1009, the I / S-CSCF transmits “INVITE” to the UE # 2, and in step S1010, the UE # 2 transmits “200 OK (“ INVITE ”) to the I / S-CSCF. Response signal) ”.

  In step S1011, the I / S-CSCF transmits “200 OK” to the SCC AS, and in step S1012, the SCC AS transmits “200 OK” to the I / S-CSCF. In step S1013, the I / S-CSCF transmits “200 OK” to the P-CSCF / VATF. In step S1014, the P-CSCF / VATF transmits “200 OK” to the UE # 1. Send.

  As a result, a voice communication signaling path between UE # 1 and UE # 2 is set between UE # 1, P-CSCF / VATF, and UE # 2, and UE # 1 and UE # 2 Is set between UE # 1, MGW # 1, and UE # 2.

  According to the mobile communication system according to the present embodiment, MGW # 1 is assigned to a path that cannot use the SRVCC improvement method among voice communication paths between UE # 1 and UE # 2. Therefore, waste of resources of MGW # 1 can be prevented.

(Modification 1)
Hereinafter, with reference to FIG. 3 and FIG. 4, the mobile communication system according to the first modification of the first embodiment described above is focused on differences from the mobile communication system according to the first embodiment described above. explain.

  1stly, with reference to FIG. 3, the IMS Registration procedure of UE # 1 in the mobile communication system which concerns on this modification 1 is demonstrated.

  As shown in FIG. 3, in step S3001, UE # 1 transmits an IMS Registration request signal including SRVCC capability indicating whether UE # 1 is compatible with the SRVCC scheme, to the P-CSCF / VATF.

  In step S3002, the P-CSCF / VATF stores the SRVCC capability. In step S3003, the P-CSCF / VATF transmits an IMS Registration request signal including the SRVCC capability to the I / S-CSCF.

  In step S3004, the I / S-CSCF transmits an IMS Registration request signal including such SRVCC capability to the SCC AS. In step S3005, the SCC AS transmits an IMS Registration response to the I / S-CSCF. Send a signal.

  In step S3006, the I / S-CSCF transmits an IMS Registration response signal to the P-CSCF / VATF. In step S3007, the P-CSCF / VATF transmits an IMS Registration response signal to the UE # 1. Send.

  Secondly, with reference to FIG. 4, a procedure for setting a route for voice communication between UE # 1 and UE # 2 will be described.

  As shown in FIG. 4, in step S4001, UE # 1 transmits “INVITE” to the P-CSCF / VATF.

  In step S4002, the P-CSCF / VATF allocates MGW # 1 based on the SRVCC capability stored in step S3002.

  For example, the P-CSCF / VATF may be configured to allocate MGW # 1 when the SRVCC capability indicates that UE # 1 is compatible with the SRVCC scheme.

  In step S4002, the P-CSCF / VATF transmits “INVITE” including “eSRVCC” to the I / S-CSCF.

  In step S4003, the I / S-CSCF transmits “INVITE” including “eSRVCC” to the SCC AS.

  In step S4005, the SCC AS transmits “INVITE” to the I / S-CSCF.

  Hereinafter, operations in steps S4006 to S4011 are the same as those in steps S1009 to S1014 shown in FIG.

(Modification 2)
Hereinafter, with reference to FIG. 5 and FIG. 6, the mobile communication system according to the second modification of the first embodiment described above is focused on differences from the mobile communication system according to the first embodiment described above. explain.

  First, with reference to FIG. 5, the IMS Registration procedure of UE # 1 in the mobile communication system according to the second modification will be described.

  As shown in FIG. 5, in step S5001, UE # 1 transmits an IMS Registration request signal including SRVCC capability indicating whether UE # 1 is compatible with the SRVCC scheme, to P-CSCF / VATF.

  In step S5002, the P-CSCF / VATF transmits an IMS Registration request signal including the SRVCC capability to the I / S-CSCF.

  In step S5003, the I / S-CSCF stores the SRVCC capability. In step S5004, the I / S-CSCF transmits an IMS Registration request signal including the SRVCC capability to the SCC AS. In step S5005, the SCC AS An IMS Registration response signal is transmitted to / S-CSCF. In step S5004, the SRVCC capability may not be notified.

  In step S5006, the I / S-CSCF transmits an IMS Registration response signal to the P-CSCF / VATF. In Step S5007, the P-CSCF / VATF transmits an IMS Registration response signal to the UE # 1. Send.

  Secondly, with reference to FIG. 6, a procedure for setting a route for voice communication between UE # 1 and UE # 2 will be described.

  As shown in FIG. 6, in step S6001, UE # 1 transmits “INVITE” to the P-CSCF / VATF.

  In step S6002, the P-CSCF / VATF transmits “INVITE” including “eSRVCC” to the I / S-CSCF.

  The I / S-CSCF depends on the subscriber profile of UE # 1 managed by the HSS in step S6003, the SRVCC capability stored in step S3002, the policy of the home network and the visited network of UE # 1, etc. It is determined whether or not the SRVCC improvement method should be used.

  Hereinafter, operations in steps S6004 to S6014 are the same as those in steps S1004 to S1014 shown in FIG.

  The characteristics of the present embodiment described above may be expressed as follows.

  The first feature of the present embodiment is that E-UTRAN (first radio access network that does not support circuit-switched communication) and UTRAN / GERAN (second radio access network that supports circuit-switched communication). And a path for voice communication between the UE # 1 and the UE # 2 in the MGW # 1 (predetermined node) in the visited network of the UE # 1 (first mobile station) is defined as E-UTRAN. Is a mobile communication method in a mobile communication system that can use an SRVCC improvement method (switching method) for switching from a route via UTRAN / GERAN to a route via UTRAN / GERAN, in which UE # 1 is located in a visited network of UE # 1 For P-CSCF / VATF (first session control node) of the "INVITE (session) including SRVCC capability (capability of the first mobile station) Start request signal) ", P-CSCF / VATF transmits" INVITE "including SRVCC capability to IMS (Service Control Network), and IMS based on SRVCC capability, The gist of the present invention is to determine whether or not to send an MGW # 1 allocation request signal, and the P-CSCF / VATF has a step of allocating MGW # 1 based on an allocation request signal received from the IMS. To do.

  The second feature of the present embodiment is provided with E-UTRAN and UTRAN / GERAN. In MGW # 1 in the visited network of UE # 1, between UE # 1 and UE # 2 A mobile communication method in a mobile communication system that can use an SRVCC improvement method that switches a route for voice communication from a route via E-UTRAN to a route via UTRAN / GERAN, in which UE # 1 is IMS Registration. In the procedure (registration procedure for the service control network), a step of notifying the SRVCC capability to the P-CSCF / VATF, and a step of transmitting “INVITE” from the UE # 1 to the P-CSCF / VATF P-CSCF / VATF decides whether to allocate MGW # 1 based on SRVCC capability And summarized in that and a degree.

  The third feature of the present embodiment is provided with E-UTRAN and UTRAN / GERAN. In MGW # 1 in the visited network of UE # 1, between UE # 1 and UE # 2 A mobile communication method in a mobile communication system that can use an SRVCC improvement method that switches a route for voice communication from a route via E-UTRAN to a route via UTRAN / GERAN, in which UE # 1 is IMS Registration. In the procedure, the step of notifying the IMS of the SRVCC capability, the step of UE # 1 sending “INVITE” to the P-CSCF / VATF, and the step of the P-CSCF / VATF to the IMS , “INVITE” and whether the IMS transmits an MGW # 1 allocation request signal based on the SRVCC capability The gist of the invention is that it includes the step of determining whether or not, and the P-CSCF / VATF has the step of assigning MGW # 1 based on the assignment request signal received from the IMS.

  The fourth feature of the present embodiment is provided with E-UTRAN and UTRAN / GERAN. In MGW # 1 in the visited network of UE # 1, between UE # 1 and UE # 2 A mobile communication system that can use the SRVCC improvement method for switching a route for voice communication from a route via E-UTRAN to a route via UTRAN / GERAN. The P-CSCF / VATF is transmitted from UE # 1. When receiving “INVITE” including the SRVCC capability, the IMS is configured to transmit “INVITE” including the SRVCC capability to the IMS. The IMS requests the allocation of the MGW # 1 based on the SRVCC capability. The P-CSCF / VATF is configured to determine whether or not to transmit a signal, and the P-CSCF / VATF receives Zui it, and subject matter that is configured to assign the MGW # 1.

  The fifth feature of the present embodiment is provided with E-UTRAN and UTRAN / GERAN. In MGW # 1 in the visited network of UE # 1, between UE # 1 and UE # 2 A mobile communication system that can use the SRVCC improvement method for switching a route for voice communication from a route via E-UTRAN to a route via UTRAN / GERAN. The P-CSCF / VATF is a UE # 1 In the IMS Registration procedure, the SRVCC capability is acquired and stored, and when the P-CSCF / VATF receives “INVITE” from UE # 1, it is based on the stored SRVCC capability, The gist is that it is configured to determine whether to assign MGW # 1.

  A sixth feature of the present embodiment is provided with E-UTRAN and UTRAN / GERAN. In MGW # 1 in the visited network of UE # 1, between UE # 1 and UE # 2 A mobile communication system that can use an SRVCC improvement method that switches a route for voice communication from a route via E-UTRAN to a route via UTRAN / GERAN. The IMS is configured in the IMS Registration procedure of UE # 1 The SRVCC capability is configured to be acquired and stored, and when the IMS receives the “INVITE” transmitted by UE # 1, the MGW # 1 allocation request based on the stored SRVCC capability The P-CSCF / VATF is configured to determine whether to transmit a signal, and the P-CSCF / VATF receives the request received from the IMS. Based on the hit request signal, and summarized in that is configured to allocate a MGW # 1.

  In addition, the above-mentioned MSC server, MGW # 1, MGW # 2, MME, S-GW, P-GW, P-CSCF / VATF, I / S-CSCF, SCC AS, SGSN, MSC, UE # 1, UE # 2, operations of RNC, NodeB, and eNB may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such ASIC includes MSC server, MGW # 1, MGW # 2, MME, S-GW, P-GW, P-CSCF / VATF, I / S-CSCF, SCC AS, SGSN, MSC, UE # 1, UE # 2, RNC, NodeB, eNB may be provided. In addition, such a storage medium and a processor include a discrete component such as an MSC server, MGW # 1, MGW # 2, MME, S-GW, P-GW, P-CSCF / VATF, I / S-CSCF, SCC AS, SGSN, It may be provided in the MSC, UE # 1, UE # 2, RNC, NodeB, and eNB.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE # 1, UE # 2, mobile station MME, mobility management node SGSN, packet switch MSC, circuit switch S-GW, P-GW, gateway device

Claims (6)

A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A mobile communication method in a voice communication system (SRVCC) mobile communication system,
The mobile station transmitting an INVITE signal to a control node in the visited network;
The control node includes a step of determining whether or not to switch the route at the gateway based on the SRVCC capability of the mobile station. A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A mobile communication system for a voice call connection method (SRVCC),
The mobile station transmits an INVITE signal to a control node in the visited network,
The mobile communication system, wherein the control node determines whether to switch the route at the gateway based on the SRVCC capability of the mobile station. A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A communication method of a mobile station in a mobile communication system for voice call connection method (SRVCC),
Transmitting an INVITE signal to a control node in the visited network;
And a step of causing the control node to determine whether or not to switch the route at the gateway based on the SRVCC capability of the mobile station. A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A mobile station in a mobile communication system for voice call connection (SRVCC),
An INVITE signal is transmitted to the control node in the visited network,
The mobile station, characterized in that, based on the SRVCC capability of the mobile station, the control node determines whether to switch the route at the gateway. A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A control method of a control node in a visited network of the mobile station in a voice communication system (SRVCC) mobile communication system,
Receiving an INVITE signal from the mobile station;
And determining whether to switch the route at the gateway based on the SRVCC capability of the mobile station. A first radio access network (E-UTRAN) not supporting circuit-switched communication, a second radio access network (UTRAN / GERAN) supporting circuit-switched communication, a mobile station, the mobile station, and the mobile A single radio including a gateway for switching a path for voice communication with a communication partner of a station from a path via the E-UTRAN to a path via the UTRAN / GERAN in the mobile station's visited network A control node in a mobile network of the mobile station in a voice communication system (SRVCC) mobile communication system,
Receiving an INVITE signal from the mobile station;
A control node that determines whether or not to switch the route at the gateway based on the SRVCC capability of the mobile station.

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