JP2012244197A - Mobile communication method and mobile station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adequately select a domain to which not only an incoming signal for voice communication destined to a UE but also an incoming signal for AV communication destined to the UE should be transferred by means of a UE-initiative-type "T-ADS."SOLUTION: A mobile communication method according to the invention includes steps of: an IMS transmitting an incoming instruction signal indicating that an incoming signal destined to a UE has been received to the UE via an E-UTRAN when the UE is in a cell subordinate to the E-UTRAN; the UE transmitting "REJECT" indicating that the UE cannot cope with AV communication via the IMS to the IMS if the type of the incoming signal destined to the UE has been determined to be AV communication; and the IMS determining providing AV communication using CSFB for the UE in response to the "REJECT."

Description

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

  Conventionally, 2G / 3G radio access system (UTRAN: Universal Terrestrial Radio Access Network / GERAN: GSM EDGE Radio Access Network) and LTE (Long Term Evolver TRA). ) Is known.

  In such a mobile communication system, voice communication is provided in either UTRAN / GERAN or E-UTRAN to a UE (User Equipment, mobile station) that can access both UTRAN / GERAN and E-UTRAN. be able to.

  Here, the mobile communication system is configured to be able to select a domain that provides voice communication to the UE using UE-driven “T-ADS (Terminated-Access Domain Selection)”. (See Non-Patent Documents 1 and 2).

  With reference to FIG. 4, the operation | movement which selects the domain which provides audio | voice communication with respect to UE using this UE initiative type "T-ADS" is demonstrated.

  As shown in FIG. 4, an S-CSCF (Serving Call Session Control Function, call session control server device) in an IMS (IP Multimedia Subsystem, service control network) receives an incoming signal for voice communication addressed to the UE in step S501. When (Invite @ Voice) is received, in step S502, an incoming signal (Invite) for voice communication is transmitted to the SCC-AS (Service Centralization and Continuity Application Server) in the IMS.

  In step S503, the SCC-AS transmits an inquiry signal to the HSS (Home Subscriber Server, subscriber management server device).

  In step S504, in response to the inquiry signal, the HSS transmits a domain inquiry signal for inquiring about the domain where the UE is located to an SGSN (Serving GPRS Support Node, packet switch) and the MME.

  In step S505, the HSS notifies the SCC-AS of the domain in which the UE is located (E-UTRAN in the example of FIG. 4) by transmitting a response signal to the above inquiry signal.

  In step S506, the SCC-AS determines a domain (E-UTRAN in the example of FIG. 4) to which an incoming signal for voice communication addressed to the UE should be transferred in response to the response signal. Then, an incoming domain instruction signal for instructing E-UTRAN to transfer an incoming signal for voice communication addressed to the UE is transmitted.

  In Steps S507 and S508, the S-CSCF instructs the UE that the incoming signal for voice communication addressed to the UE has been received via the E-UTRAN indicated by the incoming domain indication signal. Send a signal.

  Here, when it is determined that the UE cannot support voice communication via IMS according to the capability of the UE or the capability of E-UTRAN, in step S509 and S510, the UE via the E-UTRAN, “REJECT” indicating that voice communication via IMS cannot be supported is transmitted to the S-CSCF.

  In step S511, the S-CSCF transmits such “REJECT” to the SCC-AS.

  In step 512, the SCC-AS determines to provide voice communication using the CSFB to the UE in response to the “REJECT”.

3GPP TS 23.221 3GPP TS 23.292

  In the mobile communication system described above, it is assumed that AV (Audio Video) communication is provided to UEs that can access both UTRAN / GERAN and E-UTRAN.

  Here, in a cell under E-UTRAN, when AV communication via IMS cannot be provided, UTRAN / GERAN is used for UEs located in E-UTRAN using CSFB (CS Fallback). Need to provide AV communication.

  However, the above-described mobile communication system has a problem in that it is not possible to select a domain to which an incoming signal for AV communication addressed to the UE should be transferred using UE-driven “T-ADS”.

  Therefore, the present invention has been made in view of the above-described problems, and uses not only the incoming signal for voice communication addressed to the UE but also the AV communication addressed to the UE using the UE-driven “T-ADS”. It is an object of the present invention to provide a mobile communication method and a mobile station capable of appropriately selecting a domain to which an incoming call signal is to be transferred.

  The first feature of the present invention is that the mobile communication system includes a first radio access network that does not provide circuit switched communication and AV communication via IMS, and a second radio access network that provides circuit switched communication. In a communication method, when a mobile station is located in a cell under the first radio access network, an incoming indication signal indicating that the IMS has received an incoming signal addressed to the mobile station, When transmitting to the mobile station via the first radio access network, and when the mobile station determines that the type of the incoming signal addressed to the mobile station is AV communication, Transmitting a rejection signal indicating that AV communication via the IMS cannot be performed, and the IMS sends a CSF to the mobile station in response to the rejection signal. And summarized in that a step of deciding to provide the AV communication with.

  The second feature of the present invention is that the mobile is accessible to both the first radio access network that does not provide circuit switched communication and AV communication via IMS and the second radio access network that provides circuit switched communication. A mobile station that is configured to receive an incoming signal addressed to the mobile station from the IMS and a cell under the first radio access network. A transmission configured to transmit to the IMS a rejection signal indicating that AV communication via the IMS cannot be performed when it is determined that the type of the incoming signal addressed is AV communication. It is made a summary.

  As described above, according to the present invention, not only the voice communication incoming signal addressed to the UE but also the AV communication incoming signal addressed to the UE is transferred using the UE-driven “T-ADS”. A mobile communication method and a mobile station that can appropriately select a domain to be provided can be provided.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. It is a functional block diagram of SCC-AS which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating operation | movement of the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating 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 thru | or FIG. 3, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the mobile communication system according to this embodiment includes IMS, HSS, SGSN, MSC (Mobile-service Switching Center), UTRAN / GERAN, P / S-GW, , MME, E-UTRAN, etc.

  In the IMS, an SCC-AS, an S-CSCF, a P-CSCF (Proxy Call Session Control Function), and the like are arranged.

  Further, the UE is configured to be able to access both UTRAN / GERAN and E-UTRAN, and includes a reception unit 11, a determination unit 12, and a transmission unit 13, as shown in FIG. doing.

  The receiving unit 11 receives an incoming call instruction signal indicating that an incoming signal for voice communication (Invite @ Voice) addressed to the UE or an incoming signal for AV communication (Invite @ AV) addressed to the UE has been received from the IMS. It is configured.

  The deciding unit 12 determines whether it is possible to support voice communication via IMS or whether it is compatible with AV communication via IMS according to the UE capability or E-UTRAN capability. Is configured to determine about.

  For example, when the determination unit 12 determines that the type of the incoming signal addressed to the UE is AV communication and determines that AV communication via IMS is not provided in the E-UTRAN, the IMS 12 It is configured to determine that it is not possible to support AV communication via the Internet.

  Similarly, when the determination unit 12 determines that the type of the incoming signal addressed to the UE is voice communication and determines that voice communication via IMS is not provided in E-UTRAN, It is configured to determine that AV communication via IMS cannot be supported.

  When the determination unit 12 determines that the AV communication via the IMS cannot be supported, the transmission unit 13 indicates to the IMS “REJECT” indicating that the voice communication via the IMS cannot be supported. And “REJECT” indicating that AV communication via IMS cannot be supported.

  Hereinafter, specific operations of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 3, when the S-CSCF receives an incoming signal for AV communication (Invite @ AV) addressed to the UE in step S101, the S-CSCF sends the incoming signal (Invite to the SCC-AS in step S102. ).

  In step S103, the SCC-AS transmits an inquiry signal to the HSS.

  In step S104, the HSS transmits a domain inquiry signal for inquiring about the domain where the UE is located to the SGSN and MME in response to the inquiry signal.

  In step S105, the HSS notifies the SCC-AS of the domain in which the UE is located (E-UTRAN in the example of FIG. 3) by transmitting a response signal to the above inquiry signal.

  In step S106, the SCC-AS determines a domain (E-UTRAN in the example of FIG. 3) to which an incoming signal for AV communication addressed to the UE should be transferred in response to the response signal. Then, an incoming domain instruction signal for instructing E-UTRAN to transfer an incoming signal for AV communication addressed to the UE is transmitted.

  In steps S107 and S108, the S-CSCF instructs the UE to receive an incoming signal for AV communication addressed to the UE via the E-UTRAN indicated by the incoming domain instruction signal. Send a signal.

  Here, when it is determined that the UE cannot support AV communication via IMS according to the capability of the UE or the capability of E-UTRAN, in step S109 and S110, the UE via the E-UTRAN “REJECT” indicating that AV communication via IMS cannot be supported is transmitted to the S-CSCF.

  In step S111, the S-CSCF transmits such “REJECT” to the SCC-AS.

  In step 112, the SCC-AS determines to provide AV communication using CSFB to the UE in response to the “REJECT”.

  According to the mobile communication system according to the present embodiment, the domain in which not only the incoming signal for voice communication addressed to the UE but also the incoming signal for AV communication addressed to the UE should be transferred in the IMS without impact on the IMS. Can be selected appropriately.

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

  The first feature of the present embodiment is that CS communication (circuit switching communication) and E-UTRAN (first radio access network) that does not provide AV communication via IMS and UTRAN / GERAN that provides CS communication A mobile communication method in a mobile communication system including (second radio access network), and when a UE (mobile station) is located in a cell under E-UTRAN, IMS receives an incoming signal addressed to the UE. A process of transmitting an incoming call instruction signal indicating that the mobile station has received the signal to the UE via E-UTRAN, and when the UE determines that the type of the incoming signal addressed to the UE is AV communication, , A step of transmitting “REJECT (rejection signal)” indicating that the AV communication via IMS cannot be supported, and IMS responds to “REJECT” with respect to the UE. And a step of determining to provide AV communication using CSFB.

  The second feature of this embodiment is a UE that can access both E-UTRAN and UTRAN / GERAN that do not provide AV communication via IMS, and receives an incoming signal addressed to the UE from IMS. When it is determined that the type of the incoming signal addressed to the UE is AV communication when the reception unit 11 configured as described above is located in a cell under the control of E-UTRAN, IMS is set to IMS. And a transmission unit 13 configured to transmit “REJECT” indicating that it is not possible to support AV communication via the network.

  Note that the operations of the UE, UTRAN / GERAN, MSC, SGSN, E-UTRAN, MME, S / P-GW, P-CSCF, S-CSCF, SCC-AS, and HSS may be performed by hardware. It may be implemented by a software module executed by a processor or 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 Registered 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 an ASIC may be provided in the UE, UTRAN / GERAN, MSC, SGSN, E-UTRAN, MME, S / P-GW, P-CSCF, S-CSCF, SCC-AS, and HSS. In addition, such storage media and processors are provided as discrete components in UE, UTRAN / GERAN, MSC, SGSN, E-UTRAN, MME, S / P-GW, P-CSCF, S-CSCF, SCC-AS, and HSS. It may be done.

  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 ... mobile station E-UTRAN, UTRAN / GERAN ... radio access network MSC ... circuit switch SGSN ... packet switch S / P-GW ... gateway device MME ... mobile management node HSS ... subscriber management server device S-CSCF, P-CSCF ... Call session control server device SCC-AS ... Application server device 11 ... Receiving unit 12 ... Determining unit 13 ... Transmitting unit

Claims (2)

A mobile communication method in a mobile communication system including a first radio access network that does not provide circuit switched communication and AV communication via IMS and a second radio access network that provides circuit switched communication,
When the mobile station is located in a cell under the first radio access network, the IMS receives an incoming instruction signal indicating that the IMS has received an incoming signal addressed to the mobile station. Transmitting to the mobile station via
When the mobile station determines that the type of the incoming signal addressed to the mobile station is AV communication, the mobile station transmits a rejection signal indicating that the mobile station cannot support AV communication via the IMS. And a process of
And a step of determining that the IMS provides AV communication using CSFB to the mobile station in response to the rejection signal. A mobile station accessible to both a first radio access network that does not provide circuit-switched communication and AV communication via IMS and a second radio access network that provides circuit-switched communication,
A receiving unit configured to receive an incoming signal addressed to the mobile station from the IMS;
When it is determined that the type of the incoming signal addressed to the mobile station is AV communication when located in a cell under the first radio access network, AV communication via the IMS is performed with respect to the IMS. And a transmission unit configured to transmit a rejection signal indicating that it cannot respond to the mobile station.

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