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    • 专利摘要:
    mobile communication system in a mobile communication system capable of switching between a first communication state and a second communication state, in a case of a first communication state, a voip media signal is exchanged between a mobile station u # 1 and a mobile station UE #2 via an lte radio access system and an s-gw node, a voip control signal is exchanged via the lte radio access system, from the s-gw node , an ims, and in a case of a second communication state, a circuit switched signal is exchanged between the mobile station UE #1 and an enhanced msc/mgw via a 2g/3g radio access system, the signal of voip media is exchanged between the enhanced msc/mgw and the mobile station ue #2 via the s-gw node, and the voip control signal is exchanged between the enhanced msc/mgw and the mobile station ue #2 via the s-gw node and ims.
    公开号:BR112012003126B1
    申请号:R112012003126-0
    申请日:2010-08-11
    公开日:2021-08-03
    发明作者:Katsutoshi Nishida；Takashi Koshimizu；Toshiyuki Tamura
    申请人:Nec Corporation；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [0001] The present invention relates to a mobile communication system. TECHNICAL BACKGROUND
    [0002] Conventionally, a mobile communication system capable of accommodating a 2G/3G radio access system and a LTE (Long Term Evolution) radio access system has been known.
    [0003] With reference to Figure 25 and Figure 26, an operation will be described, in which a mobile communication system switches a state (a first communication state) where a mobile station UE #1 performs a voice communication (VoIP communication) with respect to a mobile station UE #2 via an LTE radio access system to a state (a second communication state) where the mobile station UE #1 performs a voice communication (circuit switched communication) with respect to the mobile station UE #2 via a 2G/3G radio access system, i.e. an operation to perform "SRVCC (Single Radio Voice Call Continuity)" defined in Non-Patent Document 1 will be described.
    [0004] In step 1 in Fig. 25, the radio access system of LTE (Source E-UTRAN) transmits a switch preparation instruction for the voice communication from the mobile station UE #1 to an MSC/MGW (Gateway from Improved MSC Server Media for SRVCC) enhanced through an MME (Mobility Management Entity, Source MME) node (steps 3-5a in Figure 26).
    [0005] In step 2 in Figure 25, the enhanced MSC/MGW transmits an instruction to prepare for a circuit switched communication to a mobile switching center MSC (Mobile Service Switching Center, Target MSC) and the radio access system 2G/3G (RNC/BS Target), hereby preparing a facility for voice communication (circuit switched communication) of mobile station UE #1 in an interval between the enhanced MSC/MGW and the 2G radio access system /3G (a switch destination) (steps 5b, 5c, 8a, 8b, and 8c in Figure 26).
    [0006] In step 3a in figure 25, the enhanced MSC/MGW transmits a switching request of a path of a VoIP media signal and a VoIP control signal to an SCC AS (Application Server Centralization and Continuity of Service) node. Service) arranged in a home network of the mobile station UE #1 in IMS (IP Multimedia Subsystem) (step 9 in Figure 26), and the SCC AS node transmits the VoIP media signal path switching request to the EU mobile station #2.
    [0007] Furthermore, in step 3b in Figure 25, the enhanced MSC/MGW notifies the LTE radio access system of the completion of the aforementioned switching preparation, thereby transmitting a switching instruction from the LTE radio access system to the 2G/3G radio access system for mobile station UE #1 (steps 12 to 14 in Figure 26).
    [0008] As a consequence, the VoIP media signal is switched from a state (a first communication state) where the VoIP media signal is exchanged between mobile station UE #1 and mobile station UE #2 through the system of LTE radio access, an S-GW node (Server gateway), and a P-GW node (PDN Gateway) to a state (the second communication state) where the VoIP media signal is exchanged between the MSC/ Improved MGW and the UE #2 mobile station.
    [0009] Furthermore, the VoIP control signal (SIP signal) is switched from a state (a first communication state) where the VoIP control signal is exchanged between mobile station UE #1 and mobile station UE # 2 through the LTE radio access system, the S-GW node, the P-GW node, and the IMS to a state (a second communication state) where the VoIP control signal is exchanged between the MSC/MGW and the mobile station UE #2 via IMS.
    [00010] Thus, between the mobile station UE #1 and the enhanced MSC/MGW, a signal (hereinafter, referred to as a "circuit switched signal)" in a circuit switched communication which includes the data switched in circuit and a control signal is exchanged through the 2G/3G radio access system. Here, the enhanced MSC/MGW is configured to convert the circuit switched signal and a communication from the VoIP media signal and the VoIP control signal.
    [00011] In addition, U plane data (hereafter referred to as a "packet signal"), other than the aforementioned VoIP media signal and VoIP control signal, are switched from a state (a first communication state) where the packet signal is exchanged between the mobile station UE #1 and a packet communication network through the LTE radio access system, the S-GW node, and the P-GW node for a state (a second communication state) where the packet signal is exchanged between the mobile station UE #1 and the packet communication network via the 2G/3G radio access system, the S-GW node, and the P node -GW. PREVIOUS TECHNICAL DOCUMENT NON-PATENT DOCUMENT
    [00012] Non-Patent Document 1: 3GPP TS23.216, V9.0.0 SUMMARY OF THE INVENTION PROBLEMS TO BE SOLVED BY THE INVENTION
    [00013] However, the aforementioned mobile communication system has a problem that in the case of switching from the first communication state to the second communication state as a path switching request is transmitted to the mobile station UE #2, which is a communication partner of the mobile station UE #1, and the mobile station UE #2 performs a path switch, when the mobile station UE #1 and the mobile station UE #2 visit networks different from each other, the time required for switching may become long.
    [00014] Another problem is that in the case of the aforementioned switching, as a path switching process in mobile station UE #1 and a path switching process in mobile station UE #2 are performed in parallel, even when the process of Path switching at mobile station UE #1 was completed earlier, as a state (steps 9 to 16 in Figure 26) where a voice communication is not possible between mobile station UE #1 and mobile station UE #2 occurs until As the path switching process in the mobile station UE #2 is completed, a handover delay may occur.
    [00015] Furthermore, in the above-mentioned mobile communication system, when the mobile station UE #1 performed a roaming, such as the IMS located in the home network of the mobile station UE #1 and a circuit switched domain (a core network 2G/3G and a radio access system) located in a visited network of the mobile station UE #1 must perform the aforementioned switching in cooperation with each other, both the home network of the mobile station UE #1 and the visited network of the mobile station UE #1 must have an SRVCC support capability which is an optional function. Furthermore, it is necessary to carry out a complicated procedure such as interwork tests or contract completion.
    [00016] Furthermore, in the above-mentioned mobile communication system, it may not be possible to perform switching from the second communication state to the first communication state.
    [00017] Therefore, the present invention was executed in view of the problems described above, and one of its objective is to provide a mobile communication system which can perform an SRVCC capable of continuously performing a voice communication within a visited network of a station mobile UE #1 even when a first communication state and a second communication state are switched, and can solve the problems of a conventional mobile communication system. MEANS TO SOLVE THE PROBLEM
    [00018] A first feature of the present invention is summarized as a mobile communication system which is provided with a radio access system that employs a first communication scheme that does not support circuit switched communication; a mobile supply network that accommodates the radio access system that employs a first communication scheme, a radio access system that employs a second communication scheme that supports circuit switched communication, a core network that employs the second communication scheme and accommodates the radio access system employing the second communication scheme, and a service control network, and which is configured to switch between a first communication state and a second communication state; in a case of the first communication state, a first mobile station visits the radio access system employing the first communication scheme and configured to perform a voice communication between the first mobile station and the second mobile station, and the configuration is such. that a VoIP media signal is exchanged through the radio access system employing the first communication scheme and a server gateway device disposed in a visited network of the first mobile station in the mobile supply network and a VoIP control signal is exchanged via the radio access system employing the first communication scheme, the server gateway device, and the service control network between the first mobile station and the second mobile station; and in a case of the second communication state, the first mobile station visits the radio access system employing the second communication scheme and is configured to perform a voice communication between the first mobile station and the second mobile station, the configuration is such that a circuit switched signal is exchanged between the first mobile station and a gateway device disposed in the core network employing the second communication scheme via the radio access system employing the second communication scheme, the media signal of VoIP is exchanged between the second mobile station and the gateway device through the server gateway device, the VoIP control signal is exchanged between the gateway device and the second mobile station through the server gateway device and the control network. service, and the gateway device converts the circuit-switched signal and a combination of the VoIP media signal and the VoIP control signal.
    [00019] A second feature of the present invention is summarized as a mobile communication system which is provided with a radio access system that employs a first communication scheme that does not support circuit switched communication; a mobile supply network that accommodates the radio access system that employs the first communication scheme, a radio access system that employs a second communication scheme that supports circuit switched communication, a core network that employs the second communication scheme and accommodates the radio access system employing the second communication scheme, and a service control network, and which is configured to switch between a first communication state and a second communication state; in a case of the first communication state, a first mobile station visits the radio access system employing the first communication scheme and configured to perform a voice communication between the first mobile station and a second mobile station, and the configuration is such. that a VoIP media signal is exchanged through the radio access system employing the first communication scheme and a server gateway device disposed in a visited network of the first mobile station in the mobile supply network and a VoIP control signal is exchanged via the radio access system employing the first communication scheme, the server gateway device, and the service control network between the first mobile station and the second mobile station; and in a case of the second communication state, the first mobile station visits the radio access system employing the second communication scheme and is configured to perform a voice communication between the first mobile station and the second mobile station, the configuration is such that a circuit switched signal is exchanged between the first mobile station and the serving gateway device through the radio access system employing the second communication scheme, the VoIP media signal is exchanged between the second mobile station and the server gateway device, the VoIP control signal is exchanged between the first mobile station and the second mobile station through the radio access system employing the second communication scheme, the server gateway device, and the control network. service, and the server gateway device converts the circuit-switched signal and the VoIP media signal. EFFECT OF THE INVENTION
    [00020] As described above, according to the present invention, it is possible to provide a mobile communication system which can perform an SRVCC capable of continuously performing a voice communication within a visited network of a mobile station UE #1 even when a first communication state and a second communication state are switched, and can solve the problems of a conventional mobile communication system. BRIEF DESCRIPTION OF THE DRAWINGS
    [00021] Figure 1 is a diagram illustrating the entire configuration of a mobile communication system according to a first embodiment of the present invention.
    [00022] Figure 2 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.
    [00023] Figure 3 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.
    [00024] Figure 4 is a diagram illustrating an operation in the Attachment time or location record in the mobile communication system according to the first embodiment of the present invention.
    [00025] Figure 5 is a flowchart illustrating an MME operation according to the first embodiment of the present invention.
    [00026] Figure 6 is a flowchart illustrating an operation of an improved MSC/MGW according to the first embodiment of the present invention.
    [00027] Figure 7 is a flowchart illustrating an operation of SGW according to the first embodiment of the present invention.
    [00028] Figure 8 is a flowchart illustrating an operation of the SGW according to the first embodiment of the present invention.
    [00029] Figure 9 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.
    [00030] Figure 10 is a sequence diagram illustrating an operation of the mobile communication system according to the first embodiment of the present invention.
    [00031] Figure 11 is a diagram illustrating the entire configuration of a mobile communication system according to a first modification of the present invention.
    [00032] Figure 12 is a sequence diagram illustrating an operation of the mobile communication system according to the first modification of the present invention.
    [00033] Figure 13 is a sequence diagram illustrating an operation of the mobile communication system according to the first modification of the present invention.
    [00034] Figure 14 is a flowchart illustrating an MME operation according to the first modification of the present invention.
    [00035] Figure 15 is a flowchart illustrating a doMME operation according to the first modification of the present invention.
    [00036] Figure 16 is a flowchart illustrating an operation of SGSN according to the first modification of the present invention.
    [00037] Figure 17 is a flowchart illustrating an SGW operation according to the first modification of the present invention.
    [00038] Figure 18 is a flowchart illustrating an operation of the SGW according to the first modification of the present invention.
    [00039] Figure 19 is a flowchart illustrating an operation of the SGW according to the first modification of the present invention.
    [00040] Figure 20 is a sequence diagram illustrating an operation of the mobile communication system according to the first modification of the present invention.
    [00041] Figure 21 is a sequence diagram illustrating an operation of the mobile communication system according to the first modification of the present invention.
    [00042] Figure 22 is a diagram illustrating the entire configuration of a mobile communication system according to a second modification of the present invention.
    [00043] Figure 23 is a diagram illustrating the entire configuration of a mobile communication system according to a third modification of the present invention.
    [00044] Figure 24 is a sequence diagram illustrating an operation of the mobile communication system according to the third modification of the present invention.
    [00045] Figure 25 is a diagram that illustrates the entire configuration of a conventional mobile communication system.
    [00046] Figure 26 is a sequence diagram illustrating an operation of the conventional mobile communication system. BEST WAYS TO PERFORM THE INVENTION
    [00047] Mobile communication system according to the first modality of the present invention
    [00048] With reference to figure 1 to figure 10, a mobile communication system according to a first embodiment of the present invention will be described.
    [00049] As illustrated in figure 1, the mobile communication system according to the present embodiment includes an LTE radio access system, a 2G/3G radio access system, a mobile supply network, a core network 2G/3G, a service control network, and a packet communication network.
    [00050] The LTE radio access system includes an eNodeB radio base station (not shown), and the 2G/3G radio access system includes a NodeB (BS) radio base station (not shown) and an RNC radio access control station (not shown).
    [00051] The mobile supply network includes an MME node, an S-GW node (Gateway server device), and a P-GW node. Here, node MME and node S-GW are arranged in a visited network of a mobile station UE #1, and node P-GW is arranged in a home network of a mobile station UE #1.
    [00052] The 2G/3G core network includes an MSC node (a mobile circuit switching center), an SGSN node (a mobile packet switching center), or an enhanced MSC/MGW (a gateway node). Here, the MSC node, the SGSN node, and the enhanced MSC/MGW are arranged in the visited network of a mobile station UE #1.
    [00053] The IMS includes a P-CSCF (Substitute Call Section Control Function) node, an S-CSCF (Serving Call Section Control Function) node, an S/P-CSCF node, and an SCC node AT.
    [00054] In the mobile communication system according to the present embodiment, a VoIP media signal, a VoIP control signal, and a packet signal are exchanged as U-plane data according to mobile station UE #1.
    [00055] The mobile communication system according to the present embodiment is configured to switch between a state (a first communication state) where the mobile station UE #1 performs a voice communication (VoIP communication) with respect to the mobile station UE #2 via the LTE radio access system and a state (a second communication state) where the mobile station UE #1 performs a voice communication (circuit switched communication) with respect to the mobile station UE #2 via the 2G/3G and MSC/MGW radio access system improved. That is, it is possible to perform an SRVCC.
    [00056] In the first communication state, the mobile station UE #1 (a first mobile station) visits the LTE radio access system, and is configured to perform voice communication with respect to the mobile station UE #2 (a second mobile station).
    [00057] Furthermore, in the first communication state, the configuration is such that between the mobile station UE #1 and the mobile station UE #2, the VoIP media signal is exchanged through the LTE radio access system, from the S-GW node, and from the P-GW node, and the VoIP control signal is exchanged through the LTE radio access system, the SGW node, the PGW node, and the IMS.
    [00058] Furthermore, in the first communication state, the configuration is such that between the mobile station UE #1 and the packet communication network, a packet signal is exchanged through the node's LTE radio access system. S-GW, and the P-GW node.
    [00059] Meanwhile, in the second communication state, the configuration is such that mobile station UE #1 visits the 2G/3G radio access system, and performs voice communication with respect to mobile station UE #2.
    [00060] Furthermore, in the second communication state, the configuration is such that a circuit switched 2G/3G signal is exchanged between the mobile station UE #1 and the enhanced MSC/MGW through the 2G/3G radio access system , the VoIP media signal is exchanged between the enhanced MSC/MGW and the UE #2 mobile station through the S-GW node and the P-GW node, and the VoIP control signal is exchanged between the enhanced MSC/MGW and the mobile station UE #2 via node S-GW, node P-GW, and IMS.
    [00061] Furthermore, in the second communication state, the configuration is such that one between the mobile station UE #1 and the packet communication network, the packet signal is exchanged through the 2G/3G radio access system, SGSN node, S-GW node, and P-GW node.
    [00062] In addition, the enhanced MSC/MGW is configured to convert a 2G/3G circuit switched signal (a combination of a voice format and a control signal) and a combination of the VoIP media signal and the voice signal. VoIP control.
    [00063] Referring to Figure 2 and Figure 3, an operation of the mobile communication system according to the first embodiment of the present invention, specifically, an operation when the first communication state is switched to the second communication state in the system of mobile communication according to the first embodiment of the present invention will be described.
    [00064] As illustrated in figure 2, in step S1000, as the current state is the first communication state, the U plane data which includes the VoIP media signal, the VoIP control signal, and the packet signal they are exchanged between the mobile station UE #1 and the node P-GW via the radio base station eNodeB and the node S-GW.
    [00065] If a handover process from mobile station UE #1 to 2G/3G radio access system of LTE radio access system starts between mobile station UE #1 and radio base station eNodeB in step S1001, the eNodeB radio base station transmits "Transfer Required" to the MME node in step S1002.
    [00066] In step S1003, node MME determines whether the mobile station UE has a capacity compatible with SRVCC and node S-GW has a predetermined capacity (capacity compatible with the present invention).
    [00067] Here, the predetermined capability includes "ability to start Bicast, which will be described later, when a predetermined trigger has been detected", or "ability to start Bicast when uplink U plane data is received through a radio access system which is a switching destination".
    [00068] When it is determined that the mobile station UE has SRVCC compatible capacity and the S-GW node has the predetermined capacity, the MME node transmits "Transfer Relocation Request" which includes an IP address and a TEID (Point Identifier End of Tunnel) from node S-GW to node SGSN in step S1004.
    [00069] In step S1005, node SGSN transmits "Relocation Request" which includes the IP address and TEID of node S-GW to the radio access control station RNC, and in step S1006, the control station radio access point RNC transmits "Relocation Request Acknowledgment" to node SGSN.
    [00070] In step S1007, node SGSN transmits "Relocation Transfer Response" which is addressed to node S-GW, to node MME.
    [00071] The operations from step S1004 to step S1007 are operations according to a transfer process for a packet signal. That is, the handover process (a switching process, for the packet signal according to mobile station UE #1 is performed through node SGSN.
    [00072] The MME node transmits "PS To CS Request" which includes the IP address and TEID of the S-GW node to the enhanced MSC/MGW in step S1008, the enhanced MSC/MGW transmits "Rel/HO Request " which includes an IP address and TEID of the MSC/MGW improved to the radio access control station RNC in step 1009, and the radio access control station RNC transmits "Rel/HO Acknowledgment" to the MSC/ MGW improved in step 1010.
    [00073] The enhanced MSC/MGW assigns the IP address and TEID of the enhanced MSC/MGW side to designate a carrier (a carrier for VoIP communication) used for transferring the VoIP media signal and the control signal of VoIP to mobile station UE #1 in step S1011, and transmits "PS To CS Response" which includes the carrier information which includes the IP address and TEID assigned from the enhanced MSC/MGW side to the MME node in the step S1012.
    [00074] In step S1013, MME node transmits "Modify Carrier Request" to adjust the above mentioned carrier information to node S-GW, and in step S1014, node S-GW transmits "Modify Carrier Response" to the MME node.
    [00075] Further, in step S1013, "Modify Carrier Request" can be transmitted from the enhanced MSC/MGW to node S-GW, and in step S1014, "Modify Carrier Response" can be transmitted from node S -GW to MSC/MGW improved.
    [00076] In step S1015, node S-GW initiates an operation (i.e. "Broadcast") to transmit a VoIP media signal and a downlink VoIP control signal to the radio base station eNodeB , and transmit the VoIP media signal and the VoIP control signal to the radio access control station RNC through the enhanced MSC/MGW and the MSC node.
    [00077] The MME node sets a VoIP carrier signal and the VoIP control signal not to be transferred to the SGSN node in step S1021, and transmits "Transfer Command" to the radio base station eNodeB in step S1022 .
    [00078] Radio base station eNodeB transmits "E-UTRAN HO Command" to mobile station UE #1 in step S1024.
    [00079] In step S1025, a procedure to establish a radio access connection is performed between the mobile station UE #1 and the radio access control station RNC, and in step S1026, the mobile station UE #1 transmits " Transfer To UTRAN Complete" for radio access control station RNC. In step 1027, uplink U-plane data transmission to the RNC of mobile station UE #1 is possible.
    [00080] As illustrated in Fig. 3, in the case where a "Direct Transfer" is applied, if downlink U plane data is received in step S1028, the radio base station eNodeB transfers the U plane data from downlink to the radio access control station RNC.
    [00081] Meanwhile, in the case in which an "Indirect Transfer" is applied, if the downlink U plane data is received in step S1028, the radio base station eNodeB transfers the downlink U plane data to the RNC radio access control station through the S-GW node. Here, when "Direct Tunnel" is not used, the radio base station eNodeB transfers the downlink plane U data from node S-GW to radio access control station RNC through node SGSN.
    [00082] In step S10281, the radio access control station RNC transmits "Reloc/HO Complete" to the enhanced MSC/MGW, and in step S10282, "PS Confirmation To CS Complete" is exchanged between the MME node and the improved MSC/MGW.
    [00083] In step S10283, the VoIP media signal and VoIP control signal are exchanged between the P-GW node and the enhanced MSC/MGW through the S-GW node, and the circuit switched signal is switched to be exchanged between mobile station UE #1 and the enhanced MSC/MGW via radio access control station RNC. Here, the enhanced MSC/MGW performs a codec conversion (RTP/AMR-Iu-UP/AMR) between the circuit switched signal and a combination of the VoIP media signal and the VoIP control signal.
    [00084] In addition, when VoIP media signal or uplink VoIP control signal is received, the S-GW node for the above-mentioned Bicast, that is, for transferring the VoIP media signal or the VoIP control signal routed to the eNodeB radio base station.
    [00085] In step S1029, the radio access control station RNC transmits "Relocation Complete" to node SGSN.
    [00086] In step S1030, the SGSN node transmits "Relocation Handover Complete" to the MME node, and in step S1031, the MME node transmits "Relocation Handover Complete" to the SGSN node.
    [00087] In step S1032, the MME node transmits "Modify Carrier Request" to the S-GW node. Here, the S-GW node changes the carrier information in response to the "Modify Carrier Request", separates the VoIP media signal and the VoIP control signal from the packet signal, and changes a transfer destination.
    [00088] In step S1033, node S-GW transmits "Modify Carrier Request" to node P-GW, and in step S1034, node P-GW transmits "Modify Carrier Response" to node S- GW.
    [00089] In step S1035, the S-GW node transmits the "Modify Carrier Response" to the MME node.
    [00090] In step S1036, the packet signal is switched to be exchanged between node P-GW and mobile station UE #1 through node S-GW, node SGSN, and radio access control station RNC .
    [00091] In step S1037, an open control of a carrier for packet communication used in the first communication state is performed between the mobile station UE #1 and the MME node.
    [00092] In the following, with reference to Figure 4, an operation in Attachment time or location registration in the mobile communication system according to the first embodiment of the present invention will be described.
    [00093] As illustrated in Figure 4, if mobile station UE #1 transmits "Attachment Request" or "Tracking Area Update Request", which includes information indicating the presence or absence of SRVCC compliant capability , for the MME node in step S101, the MME node determines whether the mobile station UE #1 has the SRVCC compliant capability based on the "Attachment Request" or "Tracking Area Update Request" in step S102.
    [00094] When it is determined that the mobile station UE #1 has the capacity compatible with SRVCC, the MME node selects a node S-GW which has the aforementioned predetermined capacity and instructs the S-GW node to set a carrier for the station mobile UE in step S103.
    [00095] In step S104, the MME node transmits "Attachment Acceptance" or "Tracking Area Update Acceptance" to mobile station UE #1.
    [00096] Next, with reference to Figure 5, an operation of the MME node according to the present modality will be described.
    [00097] As illustrated in Fig. 5, if "Transfer Required" is received from the E-UTRAN in step S111, the MME node determines whether a carrier for the VoIP carrier signal has been set with reference to the QCI (Class Identifier of QoS) and the like in step S112.
    [00098] When it is determined that the carrier for the VoIP carrier signal has not been set, the MME node performs a transfer process according to typical packet communication, which is not associated with an SRVCC process, in step S113.
    [00099] When it is determined that the carrier for the VoIP carrier signal has been set, the MME node determines whether the S-GW node is compatible with the present invention, i.e., the S-GW node has a predetermined capacity (capacity compatible with the present invention) in step S114.
    [000100] When it is determined that the S-GW node is not compatible with the present invention, the MME node performs a conventional SRVCC process in step S115.
    [000101] When it is determined that the S-GW node is compatible with the present invention, the MME node transmits "PS Request To CS", which includes a bearer context provided with a predetermined flag that indicates that an SRVCC conforms with the present invention is performed, for the improved MSC/MGW in step S116.
    [000102] Next, with reference to figure 6, an operation of the MSC/MGW improved according to the present embodiment will be described.
    [000103] As illustrated in Figure 6, if the "PS To CS Request" is received from the MME node in step S121, the enhanced MSC/MGW initiates a process for the bearer context included in the "PS To CS Request" in step S122, and performs the conventional SRVCC process in step S123.
    [000104] In step S124, the enhanced MSC/MGW determines whether the predetermined flag has been set in the carrier context included in the "PS To CS Request".
    [000105] When it is determined that the default flag has been set, the present operation proceeds to step S125. When it is determined that the default flag has not been set, the present operation ends.
    [000106] In step S125, the enhanced MSC/MGW assigns the carrier information (an IP address and a TEID) for communication between the enhanced MSC/MGW and the S-GW node, and notifies the MME node of the carrier information via "PS To CS Response".
    [000107] Next, with reference to Figure 7, an operation 1 of the S-GW node according to the embodiment of the present invention will be described.
    [000108] As illustrated in Figure 7, the S-GW node receives "Modify Carrier Request" from the MME node in step S131, and receives the IP address and TEID of the enhanced MSC/MGW in step S132.
    [000109] In step S133, the S-GW node assigns the carrier information (an IP address and a TEID) for communication between the S-GW node and the enhanced MSC/MGW and notifies the MME node of the carrier information through of "Modify Carrier Response".
    [000110] In step S134, node S-GW starts Broadcasting the VoIP media signal directed to the enhanced MSC/MGW and the radio base station eNodeB.
    [000111] Next, with reference to Figure 8, an operation 2 of the S-GW node according to the embodiment of the present invention will be described.
    [000112] As illustrated in Fig. 8 , if the uplink U plane data is received in step S141, node S-GW determines whether the U plane data is U plane data of the enhanced MSC/MGW in step S142.
    [000113] When it is determined that the U plane data is not the U plane data of the enhanced MSC/MGW, the S-GW node continues to Broadcast the VoIP media signal directed to the enhanced MSC/MGW and the station. eNodeB radio base in step S143.
    [000114] Meanwhile, when it is determined that the U plane data is the U plane data of the enhanced MSC/MGW, the S-GW node for the transfer of the VoIP media signal corresponding to the U plane data for the station eNodeB radio base station, i.e., Bi-broadcasting the VoIP media signal directed to the enhanced MSC/MGW and the eNodeB radio base station in step S144.
    [000115] In the following, with reference to Figure 9 and Figure 10, an operation of the mobile communication system according to the first embodiment of the present invention, specifically an operation when the second communication state is switched to the first communication state in the mobile communication system according to the first embodiment of the present invention will be described.
    [000116] As illustrated in figure 9, in step S2000 the current state is the second communication state, the U plane data is exchanged between the mobile station UE #1 and the node P-GW through the access control station of radio RNC and the S-GW node.
    [000117] If a handover process from the mobile station UE #1 to the LTE radio access system of the 2G/3G radio access system starts between the mobile station UE #1 and the radio access control station RNC in the step S2001, the radio access control station RNC transmits "Relocation Required" which includes "bit CS/PS HO" to node SGSN in step S2002.
    [000118] In step 2003, the SGSN node determines whether the mobile station UE and the MME node are compatible with the present invention.
    [000119] When it is determined that the mobile station UE and the MME node are compatible with the present invention, the SGSN node adds a carrier context for a VoIP media signal in step S2004.
    [000120] Radio access control station RNC transmits "Relocation Required" to node MSC in step S2005, node MSC transmits "MAP Prepare HO Required" to MSC/MGW improved in step S2006, MSC/MGW improved transmits "CS To PS Request" to the SGSN node in step S2007, and the SGSN node starts creating an EPS carrier for the VoIP media signal according to the mobile station UE#! in step S2008.
    [000121] In step S2009, the SGSN node transmits "Relocation Transfer Request" which includes a VoIP media add identifier to the MME node.
    [000122] As described above, when the "CS/PS HO bit" is included in the "Relocation Required" received in step S2002, or when it coincides with a predetermined determination logic, the SGSN node receives the "CS To Request PS" of the enhanced MSC/MGW and then transmits the "Relocation Transfer Request" to the MME node.
    [000123] Furthermore, when the "CS To PS Request" is not received from the enhanced MSC/MGW for a predetermined period, the SGSN node can only perform a transfer process according to a conventional packet communication.
    [000124] The MME node adds the carrier context of the VoIP media signal based on the VoIP media add identifier included in the "Relocation Transfer Request" received in step S2010, and transmits "Relocation Request" to the eNodeB radio base station in step S2011.
    [000125] In step S2012, the radio base station eNodeB transmits "Relocation Request Acknowledgment" to the MME node, and in step S2013, the MME node transmits "Modify Carrier Request" to the S-GW node.
    [000126] When the S-GW node assigns an IP address and a TEID to a carrier for the VoIP media signal in step S2014, and transmits "Modify Carrier Response" which includes the IP address and TEID to the MME node in step S2015.
    [000127] In step S2016, the MME node transmits "Relocation Transfer Response" to the SGSN node, and in step S2017, the SGSN node transmits "CS To PS Response" in the enhanced MSC/MGW.
    [000128] The operations from step S2009 to step S2017 are operations according to a transfer process for a packet signal.
    [000129] In step S2018, the enhanced MSC/MGW transmits "Prepare HO MAP Confirmation" to the MSC node.
    [000130] In step S2019, node S-GW starts Broadcasting the VoIP media signal directed to the enhanced MSC/MGW and the radio base station eNodeB (the carrier for the VoIP media signal).
    [000131] The MSC node transmits "Transfer Command" to the radio access control station RNC in step S2111, and the SGSN node sets a VoIP carrier signal not to be transferred to the MME node in step S2112, and transmits the "Transfer Command" to the radio access control station RNC in step S2113.
    [000132] In step S2114, the radio access control station RNC transmits "UTRAN HO Command" to the mobile station UE #1.
    [000133] In step S2115, a procedure to establish a radio access connection is performed between the mobile station UE #1 and the radio base station eNodeB, and in step S2116, the mobile station UE #1 transmits "Transfer To E-UTRAN Full" for radio access control station RNC.
    [000134] As illustrated in Fig. 10 , in step S2117, uplink U-plane data transmission to the radio base station eNodeB of mobile station UE #1 is possible.
    [000135] In the case where "Direct Transfer" is applied, if the downlink U plane data is received in step S2118, the radio access control station RNC transfers the downlink U plane data to the eNodeB radio base station.
    [000136] Meanwhile, in the case in which "Indirect Transfer" is applied, if the downlink U plane data is received in step S2118, the radio access control station RNC transfers the downlink U plane data to the eNodeB radio base station via the S-GW node. Here, when "Direct Tunnel" is not used, the radio access control station RNC transfers the downlink plane U data from node S-GW to radio base station eNodeB via node SGSN.
    [000137] In step S2119, plane data U is exchanged between mobile station UE #1 and node P-GW through radio base station eNodeB and node S-GW.
    [000138] Here, if an uplink VoIP media signal is received, the S-GW node stops the aforementioned Bicast and opens the carrier for the VoIP media signal directed to the enhanced MSC/MGW.
    [000139] In step S2120, the radio base station eNodeB transmits "Relocation Complete" to the MME node.
    [000140] In step S2121, the MME node transmits "Relocation Handover Complete" to the SGSN node, and in step S2122, the SGSN node transmits "Relocation Handover Complete" to the MME node.
    [000141] In step S2123, node SGSN transmits "Modify Carrier Request" to node S-GW.
    [000142] In step S2124, node S-GW transmits "Modify Carrier Request" to node P-GW, and in step S2125, node P-GW transmits "Modify Carrier Response" to node S-GW .
    [000143] In step S2126, node S-GW transmits the "Modify Carrier Response" to node SGSN.
    [000144] In step S2127, a packet signal is switched to be exchanged between node P-GW and mobile station UE #1 via node S-GW and radio base station eNodeB.
    [000145] In step S2128, an open control of a carrier for packet communication used in the second communication state is performed between the mobile station UE #1 and the node SGSN, and in step S2129, the open control of a switched communication in The circuit used in the second communication state is executed between the mobile station UE #1 and the enhanced MSC/MGW.
    [000146] According to the mobile communication system according to the first embodiment of the present invention, a switching process of the first communication state and the second communication state can be performed within a visited network of the mobile station UE #1 , a switching time for which communication is not possible can be reduced, and the switching process can be performed without control by the IMS.
    [000147] As a consequence, as the above-mentioned switching process can be completely hidden from the home network of the mobile station UE #1 and the mobile station UE #2, the IMS arranged in the home network of the mobile station UE #1 does not it requires SRVCC compliant capability, and a complicated procedure is not required between the home network and the visited network of the mobile station UE #1. Furthermore, according to the mobile communication system according to the first embodiment of the present invention, the second communication state can be switched to the first communication state, and the opportunity to use packet communication and packet communication simultaneously. voice using LTE radio access system is increased, resulting in the improvement of a quality of service.First modification
    [000148] With reference to figure 11 to figure 21, a mobile communication system according to a first modification of the present invention will be described. Hereinafter, the mobile communication system according to a first modification of the present invention will be described while focusing on the difference from the aforementioned mobile communication system according to the first embodiment.
    [000149] As illustrated in Fig. 11, a mobile communication system according to the present first modification is not provided with the improved MSC/MGW.
    [000150] In the first communication state, the configuration is such that between the mobile station UE #1 and the mobile station UE #2, the VoIP media signal is exchanged through the LTE radio access system and the node S -GW.
    [000151] Furthermore, in the first communication state, the configuration is such that the VoIP media signal is exchanged through the LTE radio access system, the S-GW node, and the IMS.
    [000152] In the second communication state, the configuration is such that the circuit switched signal is exchanged between the mobile station UE #1 and the node S-GW through the 2G/3G radio access system, the media signal of VoIP is exchanged between the S-GW node and the mobile station UE #2, and the VoIP control signal is exchanged between the mobile station UE #1 and the mobile station UE #2 through the 2G/3G radio access system , the S-GW node, and the IMS.
    [000153] Furthermore, in the second communication state, the S-GW node is configured to convert the circuit switched signal and the VoIP media signal.
    [000154] Referring to Figure 12 and Figure 13, an operation of the mobile communication system according to the present first modification, specifically, an operation when the first communication state is switched to the second communication state in the communication system mobile according to the present first modification will be described.
    [000155] As illustrated in figure 12, in step S3000, as the current state is the first communication state, the U plane data which includes the VoIP media signal, the VoIP control signal, and the packet signal they are exchanged between the mobile station UE #1 and the node P-GW via the radio base station eNodeB and the node S-GW.
    [000156] If a handover process from mobile station UE #1 to 2G/3G radio access system of LTE radio access system starts between mobile station UE #1 and radio base station eNodeB in step S3001, the radio base station eNodeB transmits "Relocation Required" to the MME node in step S3002.
    [000157] In step 3003, the MME node determines whether the mobile station UE has a capacity compatible with SRVCC and the node S-GW has a predetermined capacity (capacity compatible with the present invention).
    [000158] When it is determined that the mobile station UE and the node S-GW have the capability compatible with SRVCC, the node MME transmits "Relocation Request Transfer" to the node SGSN in step S3004.
    [000159] When it is determined that a carrier for the VoIP media signal exists in an MM context in step S3005, node SGSN transmits "Relocation Request" to radio access control station RNC in step S3006. In step S3007, the radio access control station RNC transmits "Relocation Request Confirmation" to node SGSN.
    [000160] In step S3008, node SGSN transmits "Relocation Request To Iu-UP" which includes a carrier identifier for the VoIP media signal to the radio access control station RNC, and in step S3009, the radio access control station RNC transmits "Carrier Establishment" which includes the carrier identifier for the VoIP media signal to the SGSN node.
    [000161] The S-GW node assigns the IP address and port number of the S-GW node side to an Iu-UP carrier in step S3010, and transmits "Carrier Acknowledgment" to the control station. RNC radio access in step S3011.
    [000162] In step S3012, an Iu-UP carrier initialization process is executed between the S-GW node and the RNC, and in step S3013, the RNC transmits "Relocation Request Confirmation To Iu-UP" to the SGSN node.
    [000163] As a consequence, the adjustment of the Iu-UP carrier in the radio access control station RNC is completed in step S3014A, and the adjustment of the Iu-UP carrier in the S-GW node is completed in the step S3014B.
    [000164] In step S3016, node S-GW starts Broadcasting the VoIP media signal directed to the radio access control station RNC (the Iu-UP bearer) and the radio base station eNodeB (a carrier for the VoIP media signal). Here, the S-GW node performs a codec conversion (RTP/AMR-Iu-UP/AMR) between the circuit-switched signal and the VoIP media signal.
    [000165] The MME node sets the VoIP bearer signal not to be transferred to the SGSN node in step S3021, and transmits "Transfer Command" to the radio base station eNodeB in step S3022.
    [000166] Radio base station eNodeB transmits "E-UTRAN HO Command" to mobile station UE #1 in step S3024.
    [000167] In step S3025, a procedure for establishing a radio access connection is performed between the mobile station UE #1 and the radio access control station RNC in step S3026, the mobile station UE #1 transmits "Transfer To E-UTRAN Full" for radio access control station RNC. In step S3027, uplink U-plane data transmission to radio access control station RNC of mobile station UE #1 is possible.
    [000168] As illustrated in Figure 13, the mobile station UE #1 transmits the circuit switched signal to the S-GW node through the radio access control station RNC (the Iu-UP carrier) in step S3028, and the S-GW node acquires a VoIP media signal by performing a codec conversion process with respect to the circuit switched signal received in step S3029, and transmits the VoIP media signal to the P-GW node in step S3030.
    [000169] The S-GW node for the above-mentioned Bicast in step S3031 because the uplink U plane data has been received, and transmits a circuit switched signal to the mobile station UE #1 through the radio access control station RNC (the Iu-UP carrier) in step S3032.
    [000170] In the case where "Direct Transfer" is applied, if the downlink U plane data is received in step S3033, the radio base station eNodeB transfers the downlink U plane data to the transmitting station. RNC radio access control.
    [000171] Meanwhile, in the case in which "Indirect Transfer" is applied, if the downlink U plane data is received in step S3033, the radio base station eNodeB transfers the downlink U plane data to the RNC radio access control station through the S-GW node. Here, when "Direct Tunnel" is not used, the radio base station eNodeB transfers the downlink plane U data from node S-GW to radio access control station RNC through node SGSN.
    [000172] In step S3034, the radio access control station RNC transmits "Relocation Complete" to node SGSN.
    [000173] In step S3035, the SGSN node transmits "Relocation Handover Complete" to the MME node, and in step S3036, the MME node transmits "Relocation Handover Complete" to the SGSN node.
    [000174] In step S3037, the MME node transmits "Modify Carrier Request" to the S-GW node.
    [000175] In step S3038, node S-GW transmits "Modify Carrier Request" to node P-GW, and in step S3039, node P-GW transmits "Modify Carrier Response" to node S- GW.
    [000176] In step S3040, the S-GW node transmits the "Modify Carrier Response" to the MME node.
    [000177] In step S3041, VoIP control signal and packet signal are switched to be exchanged between node P-GW and mobile station UE #1 through node S-GW, node SGSN, and station RNC radio access control system.
    [000178] Here, the VoIP media signal is switched to be switched between the S-GW node and the P-GW node, and the circuit switched signal is switched between the mobile station UE #1 and the S-GW node through the RNC radio access control station. Here, the S-GW node performs a codec conversion (RTP/AMR-Iu-UP/AMR) between the circuit switched signal and the VoIP media signal.
    [000179] In step S3042, an open control of a carrier for packet communication used in the first communication state is performed between the mobile station UE #1 and the MME node.
    [000180] Next, with reference to figure 14, an operation 1 of the MME node according to the present first modification will be described.
    [000181] As illustrated in Fig. 14, if "Transfer Required" is received from the E-UTRAN in step S201, the MME node determines whether a carrier for the VoIP carrier signal has been set with reference to QCI and the like in step S202 .
    [000182] When it is determined that the carrier for the VoIP carrier signal has not been set, the MME node performs a transfer process according to typical packet communication, which is not associated with an SRVCC process, in step S203.
    [000183] When it is determined that the carrier for the VoIP carrier signal has been set, the MME node determines whether mobile station UE #1 and node S-GW are compatible with the present invention, i.e., mobile station UE # 1 and node S-GW have a predetermined function (function according to the present invention) in step S204.
    [000184] When it is determined that mobile station UE #1 and node S-GW are not compatible with the present invention, node MME performs a conventional SRVCC process in step S205.
    [000185] When it is determined that mobile station UE #1 and node S-GW are compatible with the present invention, node MME transmits "Relocation Handover Request", which includes a bearer context provided with a predetermined identifier which indicates that an SRVCC according to the present invention is performed, for node SGSN in step S206.
    [000186] Next, with reference to figure 15, an operation 2 of the MME node according to the present first modification will be described.
    [000187] As illustrated in Fig. 15, if the "Relocation Transfer Response" is received from the SGSN node in step S211, the MME node determines whether the carrier for the VoIP carrier signal has been adjusted with reference to QCI and the like in step S212.
    [000188] When it is determined that the carrier for the VoIP carrier signal has not been set, the MME node performs a transfer process according to typical packet communication, which is not associated with an SRVCC process, in step S213.
    [000189] When it is determined that the carrier for the VoIP carrier signal has been set, the MME node does not set the carrier information for the VoIP media signal in "Carriers Subject to Data Transfer List" under "Command of Transfer" to be transmitted to the E-UTRAN in step S214.
    [000190] In the following with reference to figure 16, an operation of the SGSN node according to the present first modification will be described.
    [000191] As illustrated in Figure 16, if the "Relocation Transfer Request" is received from the MME node in step S221, the SGSN node starts a process for the bearer context included in the "Relocation Transfer Request" in step S222 , and determines whether a predetermined identifier has been set in the bearer context included in the "Relocation Transfer Request" in step S223.
    [000192] When it is determined that the predetermined identifier has been set, operation proceeds to step S224. When it is determined that the predetermined identifier has not been set, operation proceeds to step S225.
    [000193] In step S224, node SGSN instructs radio access control station RNC to set a carrier for circuit switched communication, and performs a handover process according to a typical packet communication, which is not associated with an SRVCC process.
    [000194] In step S225, node SGSN performs the transfer process according to typical packet communication, which is not associated with an SRVCC process.
    [000195] In the following with reference to figure 17, an operation 1 of node S-GW according to the present first modification will be described.
    [000196] As illustrated in Figure 17, if "Carrier Establishment" is received from the radio access control station RNC in step S231, the S-GW node assigns the IP address and port number from the node side from S-GW to the Iu-UP carrier and stores the carrier to the VoIP media signal, which is subjected to a codec conversion, in step S232.
    [000197] In step S233, node S-GW transmits "Carrier Acknowledgment" which includes the IP address and the Port number.
    [000198] Next, with reference to Figure 18, an operation 2 of node S-GW according to the present first modification will be described.
    [000199] As illustrated in Figure 18, if the Iu-UP carrier adjustment is completed between the S-GW node and the radio access control station RNC in step S241, the S-GW node starts broadcasting the signal. VoIP media directed to radio access control station RNC and radio base station eNodeB in step S242.
    [000200] As illustrated in Figure 19 , if uplink U plane data is received in step S251, node S-GW determines whether U plane data is U plane data received through Iu-UP in step S252.
    [000201] When it is determined that the U plane data is not the U plane data received via the Iu-UP the S-GW node continues Bicast on the VoIP media signal directed to the radio access control station RNC and the radio base station eNodeB in step S253.
    [000202] Meanwhile, when it is determined that the U plane data is the U plane data received through the Iu-UP the S-GW node for the transfer of the VoIP media signal corresponding to the U plane data for the station eNodeB radio base station, i.e., Broadcasting the VoIP media signal directed to the radio access control station RNC and the radio base station eNodeB in step S254.
    [000203] In the following, with reference to Figure 20 and Figure 21, an operation of the mobile communication system according to the present first modification, specifically an operation when the second communication state is switched to the first communication state in the system of mobile communication according to the present first modification will be described.
    [000204] As illustrated in Fig. 20, in step S4000, as the current state is the second communication state, the U plane data is exchanged between the mobile station UE #1 and the node P-GW through the control station. RNC radio access and S-GW node.
    [000205] If a handover process from the mobile station UE #1 to the LTE radio access system of the 2G/3G radio access system starts between the mobile station UE #1 and the radio access control station RNC in the step S4001, radio access control station RNC transmits "Relocation Required" to node SGSN in step S4002.
    [000206] When it is determined that the mobile station UE and the MME node are compatible with the present invention, the SGSN node starts creating an EPS carrier for a VoIP media signal in step S4003.
    [000207] In step S4004 the SGSN node transmits "Relocation Transfer Request" which includes a carrier identifier for the VoIP media signal to the MME node.
    [000208] The MME node adds the bearer context to the VoIP media signal based on the carrier identifier of the VoIP media signal included in the "Relocation Transfer Request" received in step S4005, and transmits "Transfer Request " to the eNodeB radio base station in step S4006.
    [000209] In step S4007, radio base station eNodeB transmits "Transfer Request Acknowledgment" to MME node, and in step S4008, MME node transmits "Carrier Modify Request" to node S-GW.
    [000210] The S-GW node assigns an IP address and a TEID to a carrier for the VoIP media signal in step S4009, and transmits "Modify Carrier Response" which includes the IP address and TEID to the node MME in step S4010.
    [000211] In step S4011, the MME node transmits "Relocation Transfer Response" to the SGSN node.
    [000212] In step S4012, node S-GW starts Broadcasting the VoIP media signal directed to the enhanced MSC/MGW and the radio base station eNodeB (the carrier for the VoIP media signal).
    [000213] The SGSN node sets a VoIP bearer signal not to be transferred to the MME node in step S4021, and transmits the "Transfer Command" to the radio access control station RNC in step S4022.
    [000214] In step S4023, radio access control station RNC transmits "UTRAN HO Command" to mobile station UE #1.
    [000215] In step S4024, a procedure to establish a radio access connection is performed between the mobile station UE #1 and the radio base station eNodeB, and in step S4025, the mobile station UE #1 transmits "Transfer To E-UTRAN Full" for radio access control station RNC.
    [000216] In step S4026, uplink U plane data transmission to radio base station eNodeB of mobile station UE #1 is possible.
    [000217] As illustrated in figure 21, the mobile station UE #1 transmits the VoIP media signal and the VoIP control signal to node S-GW through the radio base station eNodeB (the carrier for the signal from VoIP media) in step S4028, and node S-GW transmits the VoIP media signal to node P-GW without performing a codec conversion process with respect to the circuit switched signal received in step S4029.
    [000218] The S-GW node for the aforementioned Bicast in step S4030 because the uplink U plane data has been received, opens the carrier for the VoIP media signal directed to the radio access control station RNC, and transmits a circuit switch signal to the mobile station UE #1 via the radio base station eNodeB (the Iu-UP carrier) in step S4031.
    [000219] In the case where "Direct Transfer" is applied, if the downlink U plane data is received in step S4032, the radio access control station RNC transfers the downlink U plane data to the eNodeB radio base station.
    [000220] Meanwhile, in the case in which "Indirect Transfer" is applied, if the downlink U plane data is received in step S4032, the radio access control station RNC transfers the downlink U plane data to the eNodeB radio base station via the S-GW node. Here, when "Direct Tunnel" is not used, the radio access control station RNC transfers the downlink plane U data from node S-GW to radio base station eNodeB via node SGSN.
    [000221] In step S4033, the radio access control station RNC transmits "Relocation Complete" to node SGSN.
    [000222] In step S4034, node SGSN transmits "Relocation Handover Complete" to radio base station eNodeB, and in step S4035, radio base station eNodeB transmits "Relocation Handover Complete" to node SGSN.
    [000223] In step S4036, node SGSN transmits "Modify Carrier Request" to node S-GW.
    [000224] In step S4037, node S-GW transmits "Modify Carrier Request" to node P-GW, and in step S4038, node P-GW transmits "Modify Carrier Response" to node S-GW .
    [000225] In step S4039, node S-GW transmits the "Modify Carrier Response" to node SGSN.
    [000226] In step S4040, a packet signal is switched to be exchanged between node P-GW and mobile station UE #1 via node S-GW and radio base station eNodeB.
    [000227] In step S4041, an open control of a carrier for packet communication used in the second communication state is performed between the mobile station UE #1 and the node SGSN, and in step S4042, the open control of a carrier for a Circuit switched communication used in the second communication state is performed between the mobile station UE #1 and the node S-GW. second modification
    [000228] With reference to figure 22, a mobile communication system according to a second modification of the present invention will be described. Hereinafter, the mobile communication system according to the second modification of the present invention will be described while focusing on the difference from the aforementioned mobile communication system according to the first modification.
    [000229] As described in Fig. 22, in the mobile communication system according to the present second modification, the configuration is such that the VoIP control signal and the packet signal are exchanged passing through the SGSN node.
    [000230] Meanwhile, the configuration is such that the circuit switched signal is exchanged without passing through the SGSN node. third modification
    [000231] With reference to figure 23 and figure 24, a mobile communication system according to a third modification of the present invention will be described. Hereinafter, the mobile communication system according to the third modification of the present invention will be described while focusing on the difference from the aforementioned mobile communication system according to the first embodiment.
    [000232] As described in figure 23, the mobile communication system according to the present third modification can be so configured so that, in the second communication state, the VoIP control signal which includes the information according to the IMS can be exchanged between the enhanced MSC/MGW and the SCC AS node arranged in the home network of the mobile station UE #1 through the node P-CSCF provided in the visited network of the mobile station UE #1 and the node S-CSCF arranged in the network source of mobile station UE #1.
    [000233] For example, the configuration can be such that when the first communication state is switched to the second communication state, the enhanced MSC/MGW can notify the node SCC AS arranged in the home network of the mobile station UE #1 of the information (for example, the information about MS-ISDN, and the like) in accordance with the IMS, thereby updating the information in accordance with the IMS maintained by the SCC AS node.
    [000234] Specifically, as illustrated in Fig. 24, when the first communication state is switched to the second communication state, the enhanced MSC/MGW transmits "SIP message for update information" which includes "STN-SR" and " SDP-MGW" to node S-CSCF arranged in the home network of mobile station UE #1 through node P-CSCF provided in visited network of mobile station UE #1 in step S5001. The SIP message for updating information, for example, includes "UPDATE" or "REVITES".
    [000235] Here, "STN-SR" indicates a switching process from the first communication state to the second communication state, and "SDP-MGW" indicates the VoIP media information.
    [000236] In step S5002, the S-CSCF node transmits the "SIP message for updating information" which includes the "STN-SR" and "SDP-MGW" to the SCC AS node arranged in the mobile station's home network EU #1.
    [000237] In step S5003, the SCC AS node updates the information according to the IMS maintained by the SCC AS node in response to the received "SIP update information message".
    [000238] Furthermore, in such a case, the SCC AS node may be configured to notify the enhanced MSC/MGW of the information according to the IMS, which is maintained by the SCC AS node before the first communication state is switched to the second communication state.
    [000239] The characteristics of the present embodiment as described above can also be expressed as follows.
    [000240] A first feature of the present embodiment is summarized as a mobile communication system which is provided with an LTE radio access system (a first communication scheme) that does not support a circuit switched communication, a mobile supply network which accommodates the LTE radio access system, a 2G/3G radio access system (a second communication scheme) which supports circuit switched communication, a 2G/3G core network and which accommodates the wireless access system. 2G/3G radio, and an IMS (service control network), and is configured to switch between a first communication state and a second communication state; in the case of the first communication state, a mobile station UE #1 (a first mobile station) visits the LTE radio access system and is configured to perform a voice communication between the mobile station UE #1 and a mobile station UE #2 (a second mobile station), and the configuration is such that a VoIP media signal is exchanged through the LTE radio access system and an S-GW node (server gateway device) arranged in a visited network of the mobile station UE #1 in the mobile supply network and a VoIP control signal is exchanged through the LTE radio access system, node S-GW, and IMS to mobile station UE #1 and mobile station UE # two; and in the case of the second communication state, the mobile station UE #1 visits the 2G/3G radio access system and is configured to perform a voice communication between the mobile station UE #1 and a mobile station UE #2, the configuration is such that a circuit switched signal is exchanged between mobile station UE #1 and an enhanced MSC/MGW arranged in the 2G/3G core network through the 2G/3G radio access system, the VoIP media signal is exchanged between the second mobile station and the gateway device through the server gateway device, the VoIP control signal is exchanged between the enhanced MSC/MGW and the UE mobile station #2 through the S-GW node, and the VoIP control is exchanged between the enhanced MSC/MGW and UE #2 mobile station via the S-GW node and IMS, and the enhanced MSC/MGW converts the circuit-switched signal and a combination of the VoIP and media signal of the VoIP control signal.
    [000241] In the first characteristic of the present embodiment, in the case of the second communication state, the configuration can be such that between the improved MSC/MGW and a node SCC AS arranged in the home network of the mobile station UE #1, a signal of VoIP control which includes the information according to the IMS can be exchanged.
    [000242] Furthermore, a second feature of the present embodiment is summarized in a mobile communication system which is provided with an LTE radio access system, a mobile supply network, a 2G/3G radio access system; a 2G/3G core network, and an IMS, and which is configured to switch between a first communication state and a second communication state; in the case of the first communication state, a mobile station UE #1 visits the LTE radio access system and is configured to perform a voice communication between the mobile station UE #1 and a mobile station UE #2, the configuration is such that a VoIP media signal is exchanged through the LTE radio access system and an S-GW node, and a VoIP control signal is exchanged through the LTE radio access system, of the S-GW node , and the IMS between mobile station UE #1 and mobile station UE #2; and in the case of the second communication state, the mobile station UE #1 visits the 2G/3G radio access system and is configured to perform a voice communication between the mobile station UE #1 and a mobile station UE #2, the configuration is such that a circuit switched signal is exchanged between mobile station UE #1 and node S-GW through 2G/3G radio access system, VoIP media signal is exchanged between node S-GW and the mobile station UE #2, the VoIP control signal is exchanged between the mobile station UE #1 and the mobile station UE #2 through the 2G/3G radio access system, the S-GW node and the IMS, and the S-GW node converts the circuit switched signal and the VoIP media signal.
    [000243] In the second feature of the present embodiment, in the case of the second communication state, the configuration can be such that the VoIP control signal can be exchanged between mobile station UE #1 and mobile station UE #2 through the system of 2G/3G radio access, an SGSN node (a mobile packet switching center) disposed in the 2G/3G core network, the S-GW node, and the IMS.
    [000244] It is noted that the operation of the MME, SGW, PGW, P-CSCF, S-CSCF, SCC, AS, S/P-CSCF, eNodeB, SGSN, MSC or UE described above can be implemented by hardware, it can it can also be implemented by a software module executed by a processor, and it can also be implemented by a combination of the two.
    [000245] The software module may be arranged on a storage medium of an arbitrary format such as 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 registry, a hard disk, a removable disk, and a CD-ROM.
    [000246] The storage medium is connected to the processor so that the processor can write and read information to and from the storage medium. Such storage medium may also be accumulated in the processor. The storage medium and processor can be arranged in an ASIC. So that ASIC can be arranged in MME, SGW, PGW, P-CSCF, S-CSCF, SCC, AS, S/P-CSCF, eNodeB, SGSN, MSC or UE. Further, such storage medium or processor may be arranged, as a discrete component, in the MME, SGW, PGW, P-CSCF, S-CSCF, SCC, AS, S/P-CSCF, eNodeB, SGSN, MSC or UE.
    [000247] Thus, the present invention has been explained in detail using the modalities described above; however, it is obvious that for persons skilled in the art, the present invention is not limited to the embodiments explained herein. The present invention can be implemented as a corrected and modified mode without departing from the essence and scope of the present invention defined by the embodiments. Therefore, the specification description is intended to explain the example only and does not impose any limited meaning on the present invention.
    权利要求:
    Claims (6)
    [0001]
    1. Mobile communication system for realizing a Single Radio Voice Call Continuity (SRVCC), the mobile communication system comprising: an LTE radio access system; a 2G/3G radio access system; an MSC/MGW improved; a gateway; and an IP multimedia subsystem (IMS) in which the path through the 2G/3G radio access system includes a circuit-switched signal exchanged between the first mobile station and the enhanced MSC/MGW via the 2G/3G radio access system and a VoIP media signal and a VoIP control signal exchanged between the enhanced MSC/MGW and the second mobile station, and characterized in that the enhanced MSC/MGW is configured to convert the circuit-switched signal to the signal. VoIP media and the VoIP control signal.
    [0002]
    2. Mobile communication method for a mobile communication system for realizing Single Radio Voice Call Continuity (SRVCC), the mobile communication method comprising the steps of: switching, by a gateway, a path for voice communications between a first mobile station (UE#1) and a second mobile station (UE#2), from a path through an LTE radio access system to a path through a 2G/3G radio access system in a visited network of the first mobile station, the path through the 2G/3G radio access system including a circuit switched signal between the first mobile station and an enhanced MSC/MGW via the 2G/3G radio access system, and a signal of VoIP media and a VoIP control signal exchanged between the enhanced MSC/MGW and the second mobile station; and characterized by the fact that it further comprises: converting, through the enhanced MSC/MGW, the circuit switched signal to the VoIP media signal and the VoIP control signal.
    [0003]
    3. Mobile station (UE#1) to perform a Single Radio Voice Call Continuity (SRVCC), characterized in that it comprises: a controller adapted to perform a handover from a radio access system LTE to a 2G/3G radio access system, and a transceiver adapted to provide a mobility management entity (MME) with an Attach Request message or a Tracking Area Update Request message including SRVCC capacity information of the mobile station, wherein a path for voice communications between the mobile station and an additional mobile station (UE#2) is switched from a first path through the LTE radio access system to a second path through the LTE radio access system. 2G/3G radio access on a mobile station's visited network based on the mobile station's SRVCC capability, the second path including a circuit-switched signal exchanged between the mobile station and a Enhanced MSC/MGW through the 2G/3G radio access system and a VoIP media signal and a VoIP control signal exchanged between the enhanced MSC/MGW and the additional mobile station, the mobile station being adapted to exchange, with the enhanced MSC/MGW, the circuit-switched signal for conversion into the VoIP media signal and the VoIP control signal by the enhanced MSC/MGW.
    [0004]
    4. Mobile communication method for a mobile station (UE#1) to perform a Single Radio Voice Call Continuity (SRVCC), characterized in that it comprises the steps of: performing a handover of an access system from LTE radio to a 2G/3G radio access system; and provide a mobility management entity (MME) with an Attach Request message or a Tracking Area Update Request message including information about the mobile station's SRVCC capability, and in which a path for voice communications between the mobile station and an additional mobile station (UE#2) is switched from a first path through the LTE radio access system to a second path through the 2G/3G radio access system in a visited network of the mobile station based on the SRVCC capability of the mobile station, the second path including a circuit switched signal exchanged between the mobile station and an enhanced MSC/MGW via the 2G/3G radio access system and a VoIP media signal and a control signal VoIP exchanged between the enhanced MSC/MGW and the additional mobile station, wherein the station exchanges, with the enhanced MSC/MGW, the circuit-switched signal for conversion into the VoIP media signal and the control signal VoIP port by MSC/MGW improved.
    [0005]
    5. Improved MSC/MGW, adapted for use in a mobile communication system in which a path for voice communications between a mobile station (UE#1) and an additional mobile station (UE#2) is switched from a first path through an LTE radio access system to a second path through a 2G/3G radio access system in a visited network of the mobile station based on the SRVCC capability of the mobile station, wherein the second path includes a switched signal per circuit, a VoIP media signal and a VoIP control signal, wherein the enhanced MSC/MGW is adapted to exchange the circuit-switched signal between the mobile station and the enhanced MSC/MGW via the radio access system 2G/3G, and characterized by the fact that it is adapted to convert the circuit-switched signal to the VoIP media signal and the VoIP control signal.
    [0006]
    6. Signal control method by an enhanced MSC/MGW, characterized in that it comprises the steps of: converting, by an enhanced MSC/MGW, a circuit-switched signal to a VoIP media signal and a control signal of VoIP, wherein a path for voice communications between a mobile station (UE#1) and an additional mobile station (UE#2) is switched from a first path through an LTE radio access system to a second path through a 2G/3G radio access system in a visited mobile station network based on the SRVCC capacity of the mobile station, where the second path includes the circuit switched signal, the VoIP media signal, and the VoIP control, where the circuit-switched signal is exchanged between the mobile station and the enhanced MSC/MGW via the 2G/3G radio access system, and where the VoIP media signal and the VoIP control signal are exchanged between the enhanced MSC/MGW and the additional mobile station.
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    法律状态:
    2020-11-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-11-10| B25A| Requested transfer of rights approved|Owner name: NEC CORPORATION (JP) |
    2020-11-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-06-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-03| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 11/08/2010, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |
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