WO2015062468A1 - 一种单一无线语音通话连续性切换的方法、设备及系统 - Google Patents

一种单一无线语音通话连续性切换的方法、设备及系统 Download PDF

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Publication number
WO2015062468A1
WO2015062468A1 PCT/CN2014/089662 CN2014089662W WO2015062468A1 WO 2015062468 A1 WO2015062468 A1 WO 2015062468A1 CN 2014089662 W CN2014089662 W CN 2014089662W WO 2015062468 A1 WO2015062468 A1 WO 2015062468A1
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Prior art keywords
session
stn
session establishment
cscf
establishment request
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PCT/CN2014/089662
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English (en)
French (fr)
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简海燕
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, device, and system for SRVCC (Single Radio Voice Call Continuity) handover.
  • SRVCC Single Radio Voice Call Continuity
  • the user equipment sends a call setup request to the P-CSCF device in the IP Multimedia Subsystem (IMS) network (Proxy-Call Session Control Function, Agent - Call session control function), the P-CSCF device determines that it is an emergency call, sends a call setup request to an E-CSCF (Emergency-Call Session Control Function) device, and then routes the E-CSCF device to the EATF.
  • IMS IP Multimedia Subsystem
  • the E-CSCF device or the EATF device retains the STN-SR (Session Transfer Number for SRVCC, session switching number of the SRVCC), and prepares for the subsequent handover process of the emergency call.
  • the information of the call path is then sent by the E-CSCF device to a PSAP (Public Safety Answering Point), which is also called an emergency call center.
  • PSAP Public Safety Answering Point
  • the user equipment sends a handover request to the eNodeB (E-UTRAN NodeB, the evolved network base station), and the eNodeB sends a handover request to the MME (Mobility Management Entity), and the MME receives the handover request.
  • the eNodeB E-UTRAN NodeB, the evolved network base station
  • MME Mobility Management Entity
  • SRVCC IWF Interworking Function
  • the SRVCC IWF device determines that the handover request is on the emergency call, and the SRVCC IWF device generates the STN-SR, and sends the handover request to the handover request.
  • the E-CSCF device or the I-CSCF device of the network where the EATF device is located performs a handover process.
  • the STN-SR generated by the SRVCC IWF device when the user equipment is switched is likely to be associated with the ATCF (Access Transfer Control Function)/ATGW (Access).
  • ATCF Access Transfer Control Function
  • ATGW Access Gateway
  • the Transfer Gateway generates a different STN-SR when the user equipment initiates registration, so that the handover fails.
  • the embodiment of the invention provides a method for SRVCC handover, which aims to solve how to make the E-CSCF/EATF device selected by the I-CSCF consistent with the E-CSCF/EATF device selected by the call setup.
  • a method for single wireless voice call continuity SRVCC handover comprising:
  • the P-CSCF device acquires the session handover number STN-SR of the single radio voice call continuity SRVCC, which includes the session establishment request or the session establishment request, in the case of receiving the session establishment message.
  • the STN-SR includes at least routing information of the session anchoring device;
  • the STN-SR is carried in the QoS control message to notify the MME when the UE (User Equipment) initiates the handover. Transmitting a handover request to the session anchoring device according to the STN-SR.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device generates an STN-SR according to one or more of the following information carried in the emergency call session establishment request, when receiving the emergency call session establishment request sent by the UE:
  • the destination address of the emergency call the user access location information, the user card identifier, and the user equipment identifier.
  • the P-CSCF is configured When receiving the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device generates an STN-SR according to one or more of the following information stored in advance when receiving the emergency call session establishment request sent by the UE:
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device receives a response message of the emergency call session establishment request sent by the session anchoring device, and the STN-SR is carried in the response message of the emergency call session establishment request.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device receives the following information carried in the emergency call back session establishment request according to the emergency call callback session establishment request sent by the session anchoring device. Generating the STN-SR by one or more of
  • the address of the session anchoring device The address of the session anchoring device, the user access location information, the user card identifier, and the user equipment identifier.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device When the P-CSCF device receives the emergency call callback session establishment request sent by the session anchoring device, the P-CSCF device generates the location according to one or more of the following information stored in advance. STN-SR;
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the STN-SR according to one or more of the following information stored in advance;
  • User access location information user card identification, user equipment identification;
  • the P-CSCF device generates the STN-SR according to one or more of the following information, in the case that the P-CSCF device receives the normal call session establishment request sent by the session anchoring device;
  • User access location information user card identification, user equipment identification, address of the session anchoring device.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the STN-SR according to one or more of the following information:
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the session anchoring device, the P-CSCF device generates the according to one or more of the following information. STN-SR;
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the session anchoring device, where the response message of the normal call session establishment request carries the STN-SR.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including :
  • the P-CSCF device when receiving the normal call session establishment request sent by the session anchoring device, sends the normal call session establishment request to the UE, where the normal call session establishment request carries the STN-SR;
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the UE, and sends a response message of the ordinary call session establishment request to the session anchoring device.
  • a method for single wireless voice call continuity SRVCC handover comprising:
  • the mobility management entity MME receives the QoS control message sent by the P-CSCF device, where the QoS control message carries the STN-SR;
  • the MME sends a handover request to the session anchoring device according to the STN-SR when the UE initiates the handover.
  • a proxy-call session control function P-CSCF device comprising:
  • An acquiring unit configured to acquire a session switching number STN-SR of a single wireless voice call continuity SRVCC, where the session establishment message includes a session establishment request or a response message of a session establishment request, where the session establishment message is received, where
  • the STN-SR includes at least routing information of the session anchoring device;
  • a sending unit configured to: when the QoS control message is sent to the MME, the STN-SR is carried in the QoS control message, to notify the MME, when the UE initiates the handover, according to the STN-SR
  • the session anchoring device sends a handover request.
  • the acquiring unit is specifically configured to:
  • the STN-SR Upon receiving the emergency call session establishment request sent by the UE, the STN-SR is generated according to one or more of the following information carried in the emergency call session establishment request:
  • the destination address of the emergency call the user access location information, the user card identifier, and the user equipment identifier.
  • the acquiring unit is specifically configured to:
  • the STN-SR is generated according to one or more of the following information stored in advance:
  • the acquiring unit is specifically configured to:
  • the acquiring unit is specifically configured to:
  • the address of the session anchoring device The address of the session anchoring device, the user access location information, the user card identifier, and the user equipment identifier.
  • the acquiring unit is specifically configured to:
  • the acquiring unit is specifically configured to:
  • the STN-SR Upon receiving the emergency call back session establishment request sent by the session anchoring device, the STN-SR is acquired according to the emergency call callback session establishment request sent by the session anchoring device.
  • the acquiring unit is specifically configured to:
  • User access location information user card identification, user equipment identification;
  • User access location information user card identification, user equipment identification, address of the session anchoring device.
  • the acquiring unit is specifically configured to:
  • the STN-SR is generated according to one or more of the following information:
  • the address of the session anchoring device selected by the user when registering the user is not registered
  • the acquiring unit is specifically configured to:
  • the acquiring unit is specifically configured to:
  • the normal call session establishment request is sent to the UE, where the normal call session establishment request carries the STN-SR;
  • a fourth aspect a mobility management entity MME, where the MME includes:
  • a receiving unit configured to receive a quality of service QoS control message sent by the P-CSCF device, where the QoS control message carries an STN-SR;
  • a sending unit configured to send a handover request to the session anchoring device according to the STN-SR when the UE initiates the handover.
  • a fifth aspect a system for single-standby voice continuous SRVCC handover, the system comprising a proxy-call session control function P-CSCF device and a mobility management entity MME, where
  • the P-CSCF device is configured to: when receiving a session establishment message, the P-CSCF device acquires a session switching number STN-SR of a single wireless voice call continuity SRVCC, where the session establishment message includes a session establishment request Or the response message of the session establishment request, the STN-SR includes at least the routing information of the session anchoring device; and when the QoS control message is sent to the mobility management entity MME, the STN-SR is carried in the QoS control message, In order to notify the MME to send a handover request to the session anchoring device according to the STN-SR when the UE initiates the handover.
  • the P-CSCF device acquires a session switching number STN-SR of a single wireless voice call continuity SRVCC, where the session establishment message includes a session establishment request Or the response message of the session establishment request, the STN-SR includes at least the routing information of the session anchoring device; and when the QoS control message is sent to the mobility management entity MME, the STN-SR is carried in
  • the MME is configured to receive a QoS control message sent by the mobility management entity MME, where the QoS control message carries an STN-SR; when the UE initiates the handover, according to the STN-SR direction
  • the session anchoring device sends a handover request.
  • An embodiment of the present invention provides a method for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF (Policy and Charging Rules Function). a fee-based function) device, such that the PCRF device sends the STN-SR to the MME for storage, thereby ensuring I-CSCF (Interrogating-Call Session Control Function) device selection by a concise method
  • I-CSCF Interrogating-Call Session Control Function
  • FIG. 1 is a flowchart of a method for SRVCC handover according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a method for a P-CSCF device to acquire a session switching number STN-SR of an SRVCC in an emergency call scenario;
  • FIG. 4 is a schematic diagram of another method for the P-CSCF device to acquire the session switching number STN-SR of the SRVCC in an emergency call scenario;
  • FIG. 5 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for a P-CSCF device to acquire a session switching number STN-SR of an SRVCC in an emergency call callback scenario according to an embodiment of the present invention
  • FIG. 8 is a flowchart of another method for obtaining a session switching number STN-SR of an SRVCC by a P-CSCF device in an emergency call callback scenario according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for acquiring an STN-SR by using an ATCF in a calling scenario according to an embodiment of the present invention
  • FIG. 12 is a flowchart of another method for obtaining an STN-SR in a calling scenario according to an embodiment of the present invention.
  • FIG. 13 is a flowchart of a method for acquiring an STN-SR in a called scenario according to an embodiment of the present invention
  • FIG. 14 is a flowchart of a method for acquiring an STN-SR in a called scenario according to an embodiment of the present invention
  • FIG. 15 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • 16 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 17 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • FIG. 18 is a flowchart of a method for a single wireless voice call continuity SRVCC handover according to an embodiment of the present invention
  • FIG. 19 is a structural diagram of a proxy-call session control function P-CSCF device according to an embodiment of the present invention.
  • FIG. 20 is a structural diagram of a device of a mobility management entity MME according to an embodiment of the present invention.
  • 21 is a system structural diagram of a single standby voice continuous SRVCC handover
  • FIG. 22 is a schematic structural diagram of a PCSCF according to an embodiment of the present invention.
  • FIG. 1 is a flowchart of a method for SRVCC handover according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:
  • Step 101 The proxy-call session control function P-CSCF device acquires a session switching number STN-SR of a single wireless voice call continuity SRVCC, in the case of receiving a session establishment message, the session establishment message a response message including a session establishment request or a session establishment request, where the STN-SR includes at least routing information of the session anchoring device;
  • the Proxy-Call Session Control Function acquires the STN-SR, including:
  • the emergency call destination address user access location information, user card identifier, and user equipment identifier.
  • the emergency call destination address includes an address of an Emergency Call Control Function (E-CSCF) device or an address of an Emergency Access Transfer Function (EATF) device.
  • E-CSCF Emergency Call Control Function
  • EATF Emergency Access Transfer Function
  • the emergency destination address and user access location information are obtained from SIP.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device generates an STN-SR according to one or more of the following information stored in advance when receiving the emergency call session establishment request sent by the UE:
  • the P-CSCF device sends the address of the next hop network element of the emergency call session establishment request, the address of the session anchoring device selected by the user when registering, and the address of the session anchoring device selected when the user is not registered.
  • the address of the next hop network element is directly sent to the next network element, for example, the PCSCF/ATCF device in FIG. 2 is the next hop network element of the UE, and the E-CSCF device is the P-CSCF device/ATCF device.
  • the next hop network element, the EATF device is the next hop network element of the E-CSCF device, and the PCSCF/ATCF device is the last hop network element of the E-CSCF device, and the E-CSCF device is the last hop network of the EATF device. yuan.
  • the address of the session anchoring device selected by the user at the time of registration may be an address of an Access Transfer Control Function (ATCF) device.
  • ATCF Access Transfer Control Function
  • the destination address of the emergency call is a destination address corresponding to an emergency call number, such as 110, 119, etc.
  • the user access location information is P-Acces-Network-Info
  • the user card identifier refers to a mobile terminal.
  • the user equipment identifier refers to an international mobile device identity code of a mobile terminal such as a mobile phone (International Mobile Equipment Identity, IMEI).
  • FIG. 2 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • step 4.1 when the user initiates an emergency call, the call setup request is sent to the P-CSCF device in the IMS network;
  • Step 4.2 The P-CSCF device determines that it is an emergency call, and sends a call setup request to the E-CSCF device and then routes the signal to the EATF device.
  • the E-CSCF device or the EATF device reserves the call path, and performs the handover process for the subsequent emergency call. ready;
  • step 4.3 the E-CSCF device or the EATF device sends the call path to the emergency call center PSAP.
  • Step 7.1 the P-CSCF device uses the STN-SR generated by the pre-configured data, and the P-CSCF device sends the STN-SR to the PCRF device;
  • Step 7.2 the Serving GateWay (S-GW) or a Packet Data Network (P-GW) sends the STN-SR to the MME for storage;
  • S-GW Serving GateWay
  • P-GW Packet Data Network
  • step 7.3 the MME stores the STN-SR.
  • Step 5.1 The base station eNodeB sends a handover request to the MME.
  • Step 5.2 When the MME sends a handover request, the MME saves the STN-SR and sends the STN-SR to the SRVCC IWF device.
  • Step 5.3 The SRVCC IWF device sends the STN-SR to the I-CSCF device.
  • Step 5.4 The I-CSCF device accurately routes the handover request to the E-CSCF device or the EATF device according to the STN-SR.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device sends the emergency call session establishment request to the session anchoring device when receiving an emergency call session establishment request of the UE;
  • the P-CSCF device receives a response message of the emergency call session establishment request sent by the session anchoring device, and the STN-SR is carried in the response message of the emergency call session establishment request.
  • the P-CSCF device may obtain the STN-SR from the SIP response message of the E-CSCF device or the EATF device, and send the STN-SR to the PCRF device.
  • FIG. 3 is a schematic diagram of a method for the P-CSCF device to acquire the session switching number STN-SR of the SRVCC in an emergency call scenario. As shown in Figure 3:
  • Step 301 When the user initiates an emergency call, the call setup request INVITE is sent to the P-CSCF device in the IMS network.
  • Step 302 The P-CSCF device determines that it is an emergency call, and sends a call setup request to the E-CSCF device.
  • Step 303 The E-CSCF device sends the call request to the EATF device to notify that an emergency call occurs.
  • Step 304 The EATF device processes the INVITE and keeps in the call path to prepare for the subsequent handover process of performing the emergency call, and then sends the call to the E-CSCF device to continue routing.
  • Step 305 The E-CSCF device sends the call path to the emergency call center PSAP.
  • Step 306 The E-CSCF device receives the 183 response of the INVITE request, where the message carries the called media information, and the pre-transmission response is sent to the EATF device.
  • Step 307 after receiving the 183 response, the EATF device sends a response to the E-CSCF device after the processing completes the 183 response.
  • the STN-SR for handover is provided in the message.
  • Step 308 after receiving the 183 response of the EATF device, the E-CSCF device forwards the packet to the P-CSCF device.
  • Step 309 after receiving the 183 response, the P-CSCF device executes the service according to the media information in the message.
  • Quality of Service QoS
  • QoS Quality of Service
  • Step 310 after the P-CSCF device completes the processing, sending 183 a response to the calling UE;
  • Step 311 When the MME initiates the handover, the MME sends a handover request to the eMSC (enhanced MSC server), and carries the saved STN-SR in the request message.
  • the eMSC enhanced MSC server
  • Step 312 The eMSC requests the INVITE of the handover according to the STN-SR to the I-CSCF device in the domain where the EATF device is located.
  • Step 313 The I-CSCF device routes the request message to the ETAF device according to the STN-SR, and the ETAF device performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • FIG. 4 is a schematic diagram of another method for the P-CSCF device to acquire the session switching number STN-SR of the SRVCC in an emergency call scenario. As shown in Figure 4:
  • Step 401 When the user initiates an emergency call, the call setup request INVITE is sent to the P-CSCF device in the IMS network.
  • Step 402 The P-CSCF device determines that it is an emergency call, and sends a call setup request to the E-CSCF device. Before forwarding the message, it is determined that local media anchoring is required, and the ATCF device is inserted into the call path to directly route the message to the ATCF device.
  • Step 403 After receiving the message, the ATCF device remains in the call path, prepares for the subsequent handover process of performing the emergency call, and continues to route the request to the E-CSCF device.
  • Step 404 The E-CSCF device sends the call request to the EATF device to notify the emergency call to occur.
  • Step 405 the EATF device processes the INVITE and keeps in the call path, prepares for the subsequent handover process of performing the emergency call, and then sends the call to the E-CSCF device to continue routing.
  • Step 406 The E-CSCF device sends the call path to the emergency call center PSAP.
  • Step 407 The E-CSCF device receives the 183 response of the INVITE request, where the message carries the called media information, and the pre-transmission response is sent to the EATF device.
  • Step 408 after receiving the 183 response, the EATF device sends a response to the E-CSCF device after the processing completes the 183 response.
  • Step 409 After receiving the 183 response of the EATF device, the E-CSCF device forwards the response to the ATCF device.
  • Step 410 After receiving the 183 response of the E-CSCF device, the ATCF device sends the response to the P-CSCF. Ready.
  • the STN-SR for handover is provided in the message.
  • Step 411 After receiving the 183 response, the P-CSCF device performs a QoS control process according to the media information in the message, and provides an STN-SR parameter in the control request.
  • Step 412 After the P-CSCF device completes the processing, the 183 response is sent to the calling UE.
  • Step 413 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 414 The eMSC requests the INVITE of the handover according to the STN-SR to the I-CSCF device of the domain where the ATCF device is located.
  • Step 415 the I-CSCF device routes the request message to the ATCF device according to the STN-SR, and the ATCF device performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • FIG. 5 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • step 4.1 when the user initiates an emergency call, the call setup request is sent to the P-CSCF device in the IMS network;
  • Step 4.2 The P-CSCF device sends the call setup request to the ATCF device.
  • Step 4.3 sending the call setup request to an E-CSCF device or an EATF device;
  • step 4.4 the E-CSCF device or the EATF device sends the call setup request to the PSAP.
  • Step 7.1 The ATCF device carries the STN-SR to the P-CSCF device in the SIP response message, and the P-CSCF device sends the STN-SR to the PCRF device.
  • Step 7.2 the PCRF device sends the STN-SR to the S-GW or P-GW;
  • Step 7.3 The S-GW or the P-GW sends the STN-SR to the MME, so that the MME stores the STN-SR.
  • Step 5.1 The base station eNodeB sends a handover request to the MME.
  • Step 5.2 When the MME sends a handover request, the MME saves the STN-SR and sends the STN-SR to the SRVCC IWF device.
  • Step 5.3 The SRVCC IWF device sends the STN-SR to the I-CSCF device.
  • Step 5.4 The I-CSCF device accurately routes the handover request to the ATCF device according to the STN-SR.
  • the P-CSCF device when the P-CSCF device receives the session establishment message, the P-CSCF device Obtain the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device receives the emergency call callback session establishment request sent by the session anchoring device, and the P-CSCF device according to the emergency callback session Emergency PMIS (Public Safety Answering Point) One or more of the following information carried in the callback establishment request to generate the STN-SR;
  • Emergency PMIS Public Safety Answering Point
  • the address of the session anchoring device The address of the session anchoring device, the user access location information, the user card identifier, and the user equipment identifier.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the emergency call callback session establishment request sent by the session anchoring device, the P-CSCF device generates the location according to one or more of the following information stored in advance. STN-SR;
  • the address of the session anchoring device selected by the user at the time of registration may be an ATCF device address or an ATGW address.
  • FIG. 6 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • Step 6.1 in the process of establishing an emergency call back call session, the PSAP sends a callback session request to the I-CSCF device;
  • Step 6.2 The I-CSCF device sends the callback session request to the S-CSCF device.
  • Step 6.3 The S-CSCF device triggers an AS (Application Server) to perform service control, including service continuity service control, and then the AS routes the session back to the S-CSCF device.
  • AS Application Server
  • Step 6.4 The S-CSCF device sends the callback session request to the ATCF device.
  • Step 6.5 The ATCF device sends the callback session request to the P-CSCF device.
  • Step 6.6 The P-CSCF device sends the callback session request to the user equipment UE.
  • Step 7.1 the P-CSCF device uses the STN-SR generated by the pre-configured data, and the P-CSCF device sends the STN-SR to the PCRF device;
  • Step 7.2 the PCRF device sends the STN-SR to the S-GW or the P-GW;
  • step 7.3 the S-GW or the P-GW sends the STN-SR to the MME for storage.
  • Step 2.1 The base station eNodeB sends a handover request to the MME.
  • Step 2.2 When the MME sends a handover request, the MME saves the STN-SR and sends the STN-SR to the SRVCC IWF device.
  • Step 2.3 The SRVCC IWF device sends the STN-SR to the I-CSCF device;
  • Step 2.4 The I-CSCF device accurately routes the handover request to the ATCF device according to the STN-SR.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device acquires the STN-SR according to the emergency call callback session establishment request sent by the session anchoring device when receiving the emergency call callback session establishment request.
  • FIG. 7 is a flowchart of a method for a P-CSCF device to acquire a session switching number STN-SR of an SRVCC in an emergency call callback scenario according to an embodiment of the present invention. As shown in Figure 7,
  • Step 701 The S-CSCF device receives the called initial session establishment request INVITE, and the S-CSCF device performs a called AS triggering process, including a process of triggering an SCC (Service Centralization and Continuity) AS, S-CSCF The device sends the called initial session establishment request INVITE to the AS;
  • SCC Service Centralization and Continuity
  • Step 702 The SCC AS receives an initial session establishment request INVITE, and the SCC AS processes the session information, and keeps in the call path, and then forwards the initial session establishment request INVITE to the S-CSCF device.
  • Step 703 The S-CSCF device receives an initial session establishment INVITE request sent back by the SCC AS, and the S-CSCF device sends the ATCF device on the called side.
  • Step 704 The ATCF device receives the session establishment request of the user, keeps in the call path, and forwards the initial session establishment request INVITE to the P-CSCF device. And provide STN-SR in the message;
  • Step 705 The P-CSCF device receives an initial session establishment INVITE request, and forwards the request to the UE.
  • Step 706 The UE receives an initial session setup INVITE request, and returns a 183 response to the P-CSCF device.
  • the response message can carry media information
  • Step 707 The P-CSCF device receives the 183 response and performs a QoS control process.
  • step 708 the P-CSCF device forwards the response to the ATCF device.
  • Step 709 The ATCF device receives the 183 response, and forwards the response to the S-CSCF device.
  • Step 710 the S-CSCF device receives 183 response, and forwards it to the SCC AS.
  • Step 711 After receiving the 183 response, the SCC AS forwards the message to the S-CSCF device.
  • Step 712 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the response to the calling side.
  • Step 713 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 714 The eMSC requests the INVITE of the handover according to the STN-SR to the I-CSCF device of the domain where the ATCF device is located.
  • Step 715 The I-CSCF device routes the request message to the ATCF device according to the STN-SR, and the ATCF device associates the handover session with the original session, and performs handover processing.
  • the SCC AS carries the STN-SR to the P-CSCF device in the SIP request message.
  • FIG. 8 is a flowchart of another method for obtaining a session switching number STN-SR of an SRVCC by a P-CSCF device in an emergency call callback scenario according to an embodiment of the present invention. As shown in Figure 8,
  • Step 801 The S-CSCF device receives the called initial session establishment request INVITE, and the S-CSCF device performs a called AS triggering process, including a process of triggering the SCC AS.
  • Step 802 the S-CSCF device sends the called initial session establishment request INVITE to the AS;
  • Step 803 the SCC AS receives the initial session establishment request INVITE, the SCC AS processes the session information, and keeps in the call path, and then forwards the initial session establishment request INVITE to the S-CSCF device, and provides the STN-SR in the message;
  • Step 804 The S-CSCF device sends an initial session establishment request INVITE to the I-CSCF device.
  • Step 805 The P-CSCF device receives an initial session establishment INVITE request, and forwards the request to the UE.
  • Step 806 The UE receives the initial session establishment INVITE request, and returns a 183 response to the P-CSCF device, where the response message can carry the media information.
  • Step 807 The P-CSCF device receives the 183 response, performs a QoS control process, and forwards the response to the S-CSCF device.
  • Step 808 The S-CSCF device receives the 183 response and forwards the message to the SCC AS.
  • Step 809 After receiving the 183 response, the SCC AS forwards the message to the S-CSCF device.
  • Step 810 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the response to the calling side.
  • Step 811 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 812 The eMSC requests the INVITE of the route switching according to the STN-SR to the I-CSCF device in the domain where the SCC AS is located.
  • Step 813 The I-CSCF device routes the request message to the SCC AS according to the STN-SR, and the SCC AS performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • FIG. 9 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention. As shown in Figure 9,
  • Step 6.1 in the process of establishing an emergency call back call session, the PSAP sends a callback session request to the I-CSCF device;
  • Step 6.2 The I-CSCF device sends the callback session request to the S-CSCF device.
  • Step 6.3 The S-CSCF device triggers the AS to perform service control, including service continuity service control, and then the AS routes the session back to the S-CSCF device.
  • the request carries the STN-SR;
  • Step 6.4 The S-CSCF device sends the callback session request to the P-CSCF device.
  • Step 6.5 The P-CSCF device sends the callback session request to the user equipment UE.
  • Step 7.1 The P-CSCF device sends the STN-SR to the PCRF device.
  • Step 7.2 the PCRF device sends the STN-SR to the S-GW or the P-GW;
  • Step 7.3 The S-GW or the P-GW sends the STN-SR to the MME.
  • Step 2.1 The base station eNodeB sends a handover request to the MME.
  • Step 2.2 When the MME sends the handover request, the STN-SR obtained from the PCRF device saved by the MME is preferentially used, and the STN-SR is sent to the SRVCC IWF device.
  • Step 2.3 The SRVCC IWF device sends the STN-SR to the I-CSCF device;
  • Step 2.4 The I-CSCF device accurately routes the handover request to the AS according to the STN-SR.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the according to one or more of the following information stored in advance. STN-SR;
  • User access location information user card identification, user equipment identification;
  • the P-CSCF device generates the STN-SR according to one or more of the following information, in the case that the P-CSCF device receives the normal call session establishment request sent by the session anchoring device;
  • User access location information user card identification, user equipment identification, address of the session anchoring device.
  • the address of the session anchoring device includes an ATCF device address or an ATGW address.
  • FIG. 10 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • the user sends a normal call request to the P-CSCF device.
  • Step 2.2 The P-CSCF device sends a normal call request to the ATCF device.
  • Step 2.3 The ATCF device sends a normal call request to the S-CSCF device.
  • Step 2.4 The S-CSCF device triggers the AS to perform service control, including service continuity service control, and then the AS routes the session back to the S-CSCF device.
  • step 2.5 the S-CSCF device sends the normal call request to Callee.
  • Step 7.1 The P-CSCF device uses the STN-SR generated by the pre-configured data, and sends the STN-SR to the PCRF device.
  • Step 7.2 the PCRF device sends the STN-SR to the S-GW or the P-GW;
  • Step 7.3 The S-GW or the P-GW sends the STN-SR to the MME.
  • Step 3.1 The base station eNodeB sends a handover request to the MME.
  • Step 3.2 When the MME sends a handover request, the MME saves the STN-SR and sends the STN-SR to the SRVCC IWF device.
  • Step 3.3 the SRVCC IWF device sends the STN-SR to the I-CSCF device;
  • Step 3.4 The I-CSCF device accurately routes the handover request to the ATCF device according to the STN-SR.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the STN-SR according to one or more of the following information:
  • the P-CSCF device generates the STN-SR according to one or more of the following information, in the case that the P-CSCF device receives the normal call session establishment request sent by the session anchoring device;
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the session anchoring device, where the response message of the normal call session establishment request carries the STN-SR.
  • FIG. 11 is a flowchart of a method for acquiring an STN-SR by an ATCF device in a calling scenario according to an embodiment of the present invention.
  • Step 1101 When the user initiates an ordinary call, the initial session establishment request INVITE is sent to the P-CSCF device in the IMS network.
  • Step 1102 The P-CSCF device forwards the initial session establishment request INVITE to the ATCF device.
  • Step 1103 After receiving the message, the ATCF device prepares for the subsequent handover process of the normal call, and then routes the initial session establishment request INVITE to the S-CSCF device.
  • Step 1104 The S-CSCF device triggers the initial session request INVITE to the SCC AS.
  • Step 1105 The SCC AS processes the INVITE and keeps in the call path to prepare for the subsequent handover process of performing the normal call, and then sends the initial session establishment request INVITE to the S-CSCF device to continue routing.
  • Step 1106 The S-CSCF device sends the call path to the called side.
  • Step 1107 The S-CSCF device receives the 183 response of the INVITE request, where the message carries the called media information, and the pre-transmission response is sent to the SCC AS.
  • Step 1108 After receiving the 183 response, the SCC AS sends a response to the S-CSCF device after the processing completes the 183 response.
  • Step 1109 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the response to the ATCF device.
  • step 1110 after receiving the 183 response from the S-CSCF device, the ATCF device forwards the packet to the P-CSCF device.
  • the STN-SR for handover is provided in the message.
  • Step 1111 After receiving the 183 response, the P-CSCF device performs a QoS control process according to the media information in the message, and provides an STN-SR parameter in the control request.
  • Step 1112 After the P-CSCF device completes the processing, the 183 response is sent to the calling UE.
  • step 1113 when the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 1114 The eMSC requests the INVITE of the handover according to the STN-SR to the I-CSCF device of the domain where the ATCF device is located.
  • Step 1115 The I-CSCF device routes the request message to the ATCF device according to the STN-SR, and the ATCF device performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • FIG. 12 is a flowchart of another method for obtaining an STN-SR in a calling scenario according to an embodiment of the present invention.
  • Step 1201 When the user initiates an ordinary call, the initial session establishment request INVITE is sent to the P-CSCF device in the IMS network.
  • step 1202 the P-CSCF device forwards the initial session establishment request INVITE to the S-CSCF device.
  • Step 1203 The S-CSCF device triggers the initial session request INVITE to the SCC AS.
  • Step 1204 the SCC AS processes the INVITE, and keeps in the call path, prepares for the subsequent handover process of performing the normal call, and then sends the initial session establishment request INVITE to the S-CSCF device to continue routing, and provides in the message. STN-SR for switching.
  • Step 1205 The S-CSCF device sends the call path to the called side.
  • step 1206 the S-CSCF device receives the 183 response of the INVITE request, and the message carries the called media information.
  • step 1207 the S-CSCF device responds 183 to the SCC AS.
  • Step 1208 After receiving the 183 response, the SCC AS receives the 183 response, and sends a response to the S-CSCF device, and carries the STN-SR in the 183 response.
  • Step 1209 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the packet to the P-CSCF device.
  • Step 1210 After receiving the 183 response, the P-CSCF device performs a QoS control process according to the media information in the message, and provides the STN-SR parameter in the control request. After the P-CSCF device finishes processing, it sends a 183 response to the calling UE.
  • Step 1211 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 1212 The eMSC requests the INVITE of the route switch according to the STN-SR to the I-CSCF device of the domain where the SCC AS is located.
  • Step 1213 The I-CSCF device routes the request message to the SCC AS according to the STN-SR, and the SCC AS performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device when receiving the normal call session establishment request sent by the session anchoring device, sends the normal call session establishment request to the UE, where the normal call session establishment request carries the STN-SR;
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the UE, and sends a response message of the ordinary call session establishment request to the session anchoring device.
  • FIG. 13 is a flowchart of a method for acquiring an STN-SR in a called scenario according to an embodiment of the present invention.
  • Step 1301 The S-CSCF device receives the called initial session establishment request INVITE, and the S-CSCF device performs the called AS triggering process, including the process of triggering the SCC AS, and the S-CSCF device sends the called initial session establishment request INVITE to the AS. ;
  • Step 1302 The SCC AS receives an initial session establishment request INVITE, and the SCC AS processes the session information, and keeps in the call path, and then forwards the initial session establishment request INVITE to the S-CSCF device;
  • Step 1303 The S-CSCF device receives an initial session establishment INVITE request sent back by the SCC AS, and the S-CSCF device sends the ATCF device on the called side.
  • Step 1304 The ATCF device receives the session establishment request of the user, and remains in the call path.
  • Step 1305 The ATCF device forwards an initial session establishment request INVITE to the P-CSCF device, and provides an STN-SR in the message.
  • Step 1306 the P-CSCF device receives an initial session establishment INVITE request, and forwards to the UE;
  • Step 1307 The UE receives an initial session establishment INVITE request, and returns a 183 response to the P-CSCF device.
  • the response message can carry media information
  • Step 1308 The P-CSCF device receives the 183 response, performs a QoS control process, and forwards the response to the ATCF device.
  • Step 1309 the ATCF device receives the 183 response, and forwards the response to the S-CSCF device.
  • Step 1310 the S-CSCF device receives 183 response, and forwards it to the SCC AS.
  • Step 1311 After receiving the 183 response, the SCC AS forwards the message to the S-CSCF device.
  • Step 1312 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the response to the calling side.
  • Step 1313 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 1314 The eMSC requests the INVITE of the handover according to the STN-SR to the I-CSCF device of the domain where the ATCF device is located.
  • Step 1315 The I-CSCF device routes the request message to the ATCF device according to the STN-SR, and the ATCF device associates the handover session with the original session, and performs handover processing.
  • FIG. 14 is a flowchart of a method for acquiring an STN-SR in a called scenario according to an embodiment of the present invention.
  • Step 1401 The S-CSCF device receives the called initial session establishment request INVITE, and the S-CSCF device performs the called AS triggering process, including the process of triggering the SCC AS, and the S-CSCF device sends the called initial session establishment request INVITE to the AS. ;
  • Step 1402 The SCC AS receives an initial session establishment request INVITE, and the SCC AS processes the session information and remains in the call path.
  • step 1403 the SCC AS forwards the initial session establishment request INVITE to the S-CSCF device, and provides the STN-SR in the message.
  • Step 1404 The S-CSCF device receives an initial session establishment INVITE request sent back by the SCC AS, and the S-CSCF device sends the P-CSCF device on the called side.
  • Step 1405 The P-CSCF device receives an initial session establishment INVITE request, and forwards the request to the UE.
  • Step 1406 The UE receives an initial session establishment INVITE request, and returns a 183 response to the P-CSCF device.
  • the response message can carry media information
  • Step 1407 The P-CSCF device receives the 183 response, performs the QoS control process, provides the STN-SR parameter in the control request, and forwards the response to the S-CSCF device.
  • Step 1408 the S-CSCF device receives 183 response, and forwards it to the SCC AS.
  • Step 1409 After receiving the 183 response, the SCC AS forwards the message to the S-CSCF device.
  • Step 1410 After receiving the 183 response of the SCC AS, the S-CSCF device forwards the response to the calling side.
  • Step 1411 When the MME initiates the handover, the MME sends a handover request to the eMSC, and carries the saved STN-SR in the request message.
  • Step 1412 The eMSC requests the INVITE of the route switching according to the STN-SR to the I-CSCF device of the domain where the SCC AS is located;
  • Step 1413 The I-CSCF device routes the request message to the SCC AS according to the STN-SR, and the SCC AS performs handover processing according to the STN-SR, and associates the handover session with the original session.
  • FIG. 15 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • the user sends a normal call request to the P-CSCF device;
  • Step 2.2 The P-CSCF device sends a normal call request to the ATCF device.
  • Step 2.3 The ATCF device sends a normal call request to the S-CSCF device.
  • Step 2.4 The S-CSCF device triggers the AS to perform service control, including service continuity service control, and then the AS routes the session back to the S-CSCF device.
  • step 2.5 the S-CSCF device sends the normal call request to Callee.
  • Step 7.1 The AS carries the STN-SR in the SIP request message, and sends the STN-SR to the PCSCF.
  • the P-CSCF device obtains the STN-SR in the message, and sends the STN-SR to the PCRF device.
  • Step 7.2 the PCRF device sends the STN-SR to the S-GW or the P-GW;
  • Step 7.3 The S-GW or the P-GW sends the STN-SR to the MME.
  • Step 3.1 The base station eNodeB sends a handover request to the MME.
  • Step 3.2 When the MME sends the handover request, the STN-SR obtained by the MME from the PCRF device is preferentially used, and the STN-SR is sent to the SRVCC IWF device.
  • Step 3.3 the SRVCC IWF device sends the STN-SR to the I-CSCF device;
  • Step 3.4 The I-CSCF device accurately routes the handover request to the ATCF device according to the STN-SR.
  • Step 102 When the P-CSCF device sends a Qos control message to the mobility management entity MME, the STN-SR is carried in the QoS control message to notify the MME that when the UE initiates the handover, according to the The STN-SR sends a handover request to the session anchoring device.
  • FIG. 16 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention.
  • the P-CSCF device transmits the STN-SR to the PCRF device, and the PCRF device transmits the STN-SR to the MME through the S/P-GW, the MME And storing the STN-SR, when the MME initiates a handover request, preferentially routing the handover request to a destination according to the STN-SR.
  • FIG. 17 is a schematic diagram of a method for SRVCC handover according to an embodiment of the present invention. As shown in Figure 17,
  • Step 1701 the P-CSCF sends a Qos control message to the PCRF device, where the Qos control message carries the STN-SR;
  • Step 1702 The PCRF device sends the Qos control message to the S-GW or the P-GW.
  • Step 1703 The S-GW or the P-GW sends a setup session request to the MME, and carries the STN-SR in the setup session request.
  • Step 1704 The MME sends the response to establish a session request to the S-GW or the P-GW.
  • An embodiment of the present invention provides a method for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device will The STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method. - The CSCF device/EATF device device is consistent.
  • FIG. 18 is a flowchart of a method for a single wireless voice call continuity SRVCC handover according to an embodiment of the present invention. The method includes the following steps:
  • Step 1801 the MME receives the QoS control message sent by the P-CSCF device, where the QoS control message carries the STN-SR;
  • Step 1802 When the UE initiates the handover, the MME sends a handover request to the session anchoring device according to the STN-SR.
  • An embodiment of the present invention provides a method for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device will The STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method. - The CSCF device/EATF device device is consistent.
  • FIG. 19 is a structural diagram of a proxy-call session control function P-CSCF device according to an embodiment of the present invention. As shown in FIG. 19, the device includes:
  • the obtaining unit 1901 is configured to acquire a session switching number STN-SR of a single wireless voice call continuity SRVCC, where the session establishment message includes a response message of a session establishment request or a session establishment request, where the session establishment message is received,
  • the STN-SR includes at least routing information of the session anchoring device;
  • the sending unit 1902 when the QoS control message is sent to the mobility management entity MME, carries the STN-SR in the QoS control message, to notify the MME, according to the STN-SR, when the UE initiates the handover.
  • a handover request is sent to the session anchor device.
  • the obtaining unit 1901 is specifically configured to:
  • the STN-SR Upon receiving the emergency call session establishment request sent by the UE, the STN-SR is generated according to one or more of the following information carried in the emergency call session establishment request:
  • the destination address of the emergency call the user access location information, the user card identifier, and the user equipment identifier.
  • the obtaining unit 1901 is specifically configured to:
  • the STN-SR is generated according to one or more of the following information stored in advance:
  • next hop network element is directly sent to the next network element, for example, the PCSCF/ATCF device in FIG. 2 is the next hop network element of the UE, and the E-CSCF device is the P-CSCF device/ATCF device.
  • Next hop network element the EATF device is the next hop network element of the E-CSCF device, and PCSCF/ATCF The device is the last hop network element of the E-CSCF device, and the E-CSCF device is the last hop network element of the EATF device.
  • the address of the session anchoring device selected by the user at the time of registration may be an address of an Access Transfer Control Function (ATCF) device.
  • ATCF Access Transfer Control Function
  • the destination address of the emergency call is a destination address corresponding to an emergency call number, such as 110, 119, etc.
  • the user access location information is P-Acces-Network-Info
  • the user card identifier refers to a mobile terminal.
  • the user equipment identifier refers to an international mobile device identity code of a mobile terminal such as a mobile phone (International Mobile Equipment Identity, IMEI).
  • the obtaining unit 1901 is specifically configured to:
  • the obtaining unit 1901 is specifically configured to:
  • the address of the session anchoring device The address of the session anchoring device, the user access location information, the user card identifier, and the user equipment identifier.
  • the acquiring unit is specifically configured to:
  • the acquiring unit is specifically configured to:
  • the STN-SR Upon receiving the emergency call back session establishment request sent by the session anchoring device, the STN-SR is acquired according to the emergency call callback session establishment request sent by the session anchoring device.
  • the acquiring unit is specifically configured to:
  • User access location information user card identification, user equipment identification;
  • User access location information user card identification, user equipment identification, address of the session anchoring device.
  • the acquiring unit is specifically configured to:
  • the STN-SR is generated according to one or more of the following information:
  • the acquiring unit is specifically configured to:
  • the acquiring unit is specifically configured to:
  • the normal call session establishment request is sent to the UE, where the normal call session establishment request carries the STN-SR;
  • An embodiment of the present invention provides an apparatus for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device
  • the STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method.
  • the CSCF device/EATF device device is consistent.
  • FIG. 20 is a structural diagram of a device of a mobility management entity MME according to an embodiment of the present invention, where the MME includes:
  • the receiving unit 2001 is configured to receive a QoS control message sent by the P-CSCF device, where the QoS control message carries the STN-SR;
  • the sending unit 2002 is configured to send a handover request to the session anchoring device according to the STN-SR when the UE initiates the handover.
  • An embodiment of the present invention provides an apparatus for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device
  • the STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method.
  • the CSCF device/EATF device device is consistent.
  • FIG. 21 is a system structural diagram of a single standby voice continuous SRVCC handover.
  • the system includes a proxy-call session control function P-CSCF device 2101 and a mobility management entity MME 2102, where
  • the P-CSCF device 2101 is configured to acquire a session switching number STN-SR of a single wireless voice call continuity SRVCC, where the session establishment message includes a session establishment request or a session establishment request, if a session establishment message is received.
  • the STN-SR includes at least routing information of the session anchoring device; when transmitting the quality of service QoS control message to the mobility management entity MME 2102, The STN-SR is carried in the QoS control message to notify the MME 2102 to send a handover request to the session anchoring device according to the STN-SR when the UE initiates the handover.
  • the MME 2102 is configured to receive a QoS Qos control message sent by the P-CSCF device 2101, where the QoS control message carries an STN-SR; when the UE initiates the handover, the device is anchored to the session according to the STN-SR. Send a switch request.
  • An embodiment of the present invention provides a system for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device
  • the STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method.
  • the CSCF device/EATF device device is consistent.
  • FIG. 22 is a schematic structural diagram of a P-CSCF according to an embodiment of the present invention.
  • FIG. 22 is a device 2200 according to an embodiment of the present invention.
  • the specific implementation of the device does not limit the specific implementation of the device.
  • the device 2200 includes:
  • a processor 2201 A processor 2201, a communication interface 2202, a memory 2203, and a bus 2204.
  • the processor 2201, the communication interface 2202, and the memory 2203 complete communication with each other via the bus 2204.
  • a communication interface 2202 configured to communicate with other devices
  • the processor 2201 is configured to execute a program.
  • the program can include program code, the program code including computer operating instructions.
  • the processor 2201 may be a central processing unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present invention.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • the memory 2203 is configured to store a program.
  • the memory 2203 may be a volatile memory such as a random-access memory (RAM) or a non-volatile memory such as an read-only memory (ead-only memory). ROM), flash memory, hard disk drive (HDD) or solid Solid state drive (SSD).
  • the processor 2201 executes the following method according to the program instructions stored in the memory 2203:
  • the P-CSCF device acquires the session handover number STN-SR of the single radio voice call continuity SRVCC, which includes the session establishment request or the session establishment request, in the case of receiving the session establishment message.
  • the STN-SR includes at least routing information of the session anchoring device;
  • the P-CSCF device sends a QoS control message to the mobility management entity MME
  • the STN-SR is carried in the QoS control message to notify the MME to perform the handover according to the STN-SR.
  • a handover request is sent to the session anchor device.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device generates an STN-SR according to one or more of the following information carried in the emergency call session establishment request, when receiving the emergency call session establishment request sent by the UE:
  • the destination address of the emergency call the user access location information, the user card identifier, and the user equipment identifier.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device generates an STN-SR according to one or more of the following information stored in advance when receiving the emergency call session establishment request sent by the UE:
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device receives a response message of the emergency call session establishment request sent by the session anchoring device, and the STN-SR is carried in the response message of the emergency call session establishment request.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device receives the following information carried in the emergency call back session establishment request according to the emergency call callback session establishment request sent by the session anchoring device. Generating the STN-SR by one or more of
  • the address of the session anchoring device The address of the session anchoring device, the user access location information, the user card identifier, and the user equipment identifier.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the emergency call callback session establishment request sent by the session anchoring device, the P-CSCF device generates the location according to one or more of the following information stored in advance. STN-SR;
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the STN-SR according to one or more of the following information stored in advance;
  • User access location information user card identification, user equipment identification;
  • the P-CSCF device generates the STN-SR according to one or more of the following information, in the case that the P-CSCF device receives the normal call session establishment request sent by the session anchoring device;
  • User access location information user card identification, user equipment identification, address of the session anchoring device.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device When the P-CSCF device receives the normal call session establishment request sent by the UE, the P-CSCF device generates the STN-SR according to one or more of the following information:
  • the P-CSCF device generates the STN-SR according to one or more of the following information, in the case that the P-CSCF device receives the normal call session establishment request sent by the session anchoring device;
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the session anchoring device, where the response message of the normal call session establishment request carries the STN-SR.
  • the P-CSCF device When the P-CSCF device receives the session establishment message, the P-CSCF device acquires the session switching number STN-SR of the SRVCC, including:
  • the P-CSCF device when receiving the normal call session establishment request sent by the session anchoring device, sends the normal call session establishment request to the UE, where the normal call session establishment request carries the STN-SR;
  • the P-CSCF device receives a response message of the normal call session establishment request sent by the UE, and sends a response message of the ordinary call session establishment request to the session anchoring device.
  • the MME 2102 in FIG. 21 may also have the same structure as the P-CSCF device in FIG. 22, when the processor in the MME 2102 executes the program instructions stored in the memory. To achieve the following method:
  • the STN-SR receives a quality of service QoS control message sent by the P-CSCF device, where the QoS control message carries the STN-SR; when the user equipment UE initiates the handover, the STN-SR sends a handover request to the session anchoring device according to the STN-SR.
  • An embodiment of the present invention provides an apparatus for SRVCC handover, in which a P-CSCF device acquires a session switching number STN-SR of an SRVCC, and sends the STN-SR to a PCRF device, so that the PCRF device
  • the STN-SR is sent to the MME for storage, thereby ensuring that the E-CSCF device EATF device E-CSCF device/EATF device device selected by the I-CSCF device and the E-CSCF device EATF device E selected by the call establishment are selected by the simple method.
  • the CSCF device/EATF device device is consistent.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • the desired program code and any other medium that can be accessed by the computer may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable , fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media.
  • coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated media.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.
  • each embodiment in the present specification is described in a progressive manner, and the same similar parts between the various embodiments may be referred to each other, and each embodiment focuses on other embodiments.
  • the description is relatively simple, and the execution process of each unit specific function can be referred to the partial description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. Or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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Abstract

本发明实施例提供一种SRVCC切换的方法、设备及系统，所述方法中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF选择到的E-CSCF/EATF设备和呼叫建立选择到的E-CSCF/EATF设备保持一致。

Description

一种单一无线语音通话连续性切换的方法、设备及系统
本申请要求于2013年10月28日提交中国专利局、申请号为201310516749.7、发明名称为“一种单一无线语音通话连续性切换的方法、设备及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信领域，尤其涉及到一种SRVCC(Single Radio Voice Call Continuity，单一无线语音通话连续性)切换的方法、设备及系统。
背景技术
在紧急呼叫会话的建立过程中，用户发起紧急呼叫时，用户设备发送呼叫建立请求给IP多媒体子系统(IP Multimedia Subsystem，IMS)网络中的P-CSCF设备(Proxy-Call Session Control Function，代理-呼叫会话控制功能)设备，P-CSCF设备判断为紧急呼叫，发送呼叫建立请求给E-CSCF(Emergency-Call Session Control Function，紧急-呼叫会话控制功能)设备，再由E-CSCF设备路由到EATF(Emergency Access Transfer Function，紧急接入转换功能)设备，E-CSCF设备或者EATF设备保留STN-SR(Session Transfer Number for SRVCC，SRVCC的会话切换号码)，为后续执行紧急呼叫的切换过程做准备，然后由E-CSCF设备将所述呼叫路径的信息发送给PSAP(Public Safety Answering Point，公共安全维护中心)，其中，公共安全维护中心也称为紧急呼叫中心。当用户设备发起切换时，该用户设备向eNodeB(E-UTRAN NodeB，演进型网络基站)发送切换请求，该eNodeB向MME(Mobility Management Entity，移动管理实体)发送切换请求，MME收到切换请求后，判断该用户设备所发起的呼叫是否是紧急呼叫，若是，则将切换请求发送给SRVCC IWF(Interworking Function，互操作功能)设备，并通知SRVCC IWF设备该切换请求为紧急呼叫上的切换请求，SRVCC IWF设备收到切换请求后，判断为紧急呼叫上的切换请求，SRVCC IWF设备生成STN-SR，将切换请求发送给 E-CSCF设备或者EATF设备所在网络的I-CSCF设备执行切换过程。
如果IMS网络中有多个E-CSCF/EATF设备时，SRVCC IWF设备在用户设备发生切换时所生成的STN-SR很可能与ATCF(Access Transfer Control Function，接入切换控制功能)/ATGW(Access Transfer Gateway，接入切换网关)在该用户设备发起注册时所生成的STN-SR不同，使得切换失败。
发明内容
本发明实施例提供了一种SRVCC切换的方法，旨在解决如何使得I-CSCF选择到的E-CSCF/EATF设备和呼叫建立选择到的E-CSCF/EATF设备保持一致。
第一方面，一种单一无线语音通话连续性SRVCC切换的方法，所述方法包括：
代理-呼叫会话控制功能P-CSCF设备在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
所述P-CSCF设备向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE(User Equipment，用户设备)发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
结合第一方面，在第一方面的第一种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
结合第一方面，在第一方面的第二种可能的实现方式中，所述P-CSCF设 备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
结合第一方面，在第一方面的第三种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
结合第一方面，在第一方面的第四种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
结合第一方面，在第一方面的第五种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注 册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
结合第一方面，在第一方面的第六种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取STN-SR。
结合第一方面，在第一方面的第七种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
结合第一方面，在第一方面的第八种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR:
上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述 STN-SR；
下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
结合第一方面，在第一方面的第九种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
结合第一方面，在第一方面的第十种可能的实现方式中，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
所述P-CSCF设备接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
第二方面，一种单一无线语音通话连续性SRVCC切换的方法，所述方法包括：
移动管理实体MME接收P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
第三方面，一种代理-呼叫会话控制功能P-CSCF设备，所述设备包括：
获取单元，用于在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
发送单元，用于向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
结合第三方面，在第三方面的第一种可能的实现方式中，所述获取单元，具体用于：
在接收到UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
结合第三方面，在第三方面的第二种可能的实现方式中，所述获取单元，具体用于：
在接收到UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
结合第三方面，在第三方面的第三种可能的实现方式中，所述获取单元，具体用于：
在接收到UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
结合第三方面，在第三方面的第四种可能的实现方式中，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
结合第三方面，在第三方面的第五种可能的实现方式中，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
结合第三方面，在第三方面的第六种可能的实现方式中，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取STN-SR。
结合第三方面，在第三方面的第七种可能的实现方式中，所述获取单元，具体用于：
在接收到所述UE发送的普通呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识；
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
结合第三方面，在第三方面的第八种可能的实现方式中，所述获取单元，具体用于：
在接收到UE发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR:
上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册 时选择的会话锚定设备的地址。
结合第三方面，在第三方面的第九种可能的实现方式中，所述获取单元，具体用于：
在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
结合第三方面，在第三方面的第十种可能的实现方式中，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
第四方面，一种移动管理实体MME，所述MME包括：
接收单元，用于接收P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
发送单元，用于在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
第五方面，一种单待语音连续SRVCC切换的系统，所述系统包括代理-呼叫会话控制功能P-CSCF设备以及移动管理实体MME，其中，
所述P-CSCF设备，用于在接收到会话建立消息的情况下，所述P-CSCF设备获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
所述MME，用于接收移动管理实体MME发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；在UE发起切换时，根据所述STN-SR向 所述会话锚定设备发送切换请求。
本发明实施例提供一种SRVCC切换的方法，所述方法中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF(Policy and Charging Rules Function，策略和计费规则功能)设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF(Interrogating-Call Session Control Function，查询-呼叫会话控制功能)设备选择到的E-CSCF/EATF设备和呼叫建立选择到的E-CSCF/EATF设备保持一致。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的一种SRVCC切换的方法流程图；
图2是本发明实施例提供的一种SRVCC切换的方法示意图；
图3是在紧急呼叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的方法示意图；
图4是在紧急呼叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的另一种方法示意图；
图5是本发明实施例提供的一种SRVCC切换的方法示意图；
图6是本发明实施例提供的一种SRVCC切换的方法示意图；
图7是本发明实施例提供的一种在紧急呼叫回叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的方法流程图；
图8是本发明实施例提供的在紧急呼叫回叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的另一种方法流程图；
图9是本发明实施例提供的一种SRVCC切换的方法示意图；
图10是本发明实施例提供的一种SRVCC切换的方法示意图；
图11是本发明实施例提供的一种主叫场景下有ATCF的获取STN-SR的方法流程图；
图12是本发明实施例提供的在主叫场景下获取STN-SR的另一种方法流程图；
图13是本发明实施例提供的在被叫场景下获取STN-SR的方法流程图；
图14是本发明实施例提供的一种在被叫场景下获取STN-SR的方法流程图；
图15是本发明实施例提供的一种SRVCC切换的方法示意图；
图16是本发明实施例提供的一种SRVCC切换的方法示意图；
图17是本发明实施例提供的一种SRVCC切换的方法示意图；
图18是本发明实施例提供的一种单一无线语音通话连续性SRVCC切换的方法流程图；
图19是本发明实施例提供的一种代理-呼叫会话控制功能P-CSCF设备结构图；
图20是本发明实施例提供的一种移动管理实体MME的设备结构图；
图21是一种单待语音连续SRVCC切换的系统结构图；
图22是本发明实施例提供的一种PCSCF的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下获得的所有其他实施例，都属于本发明保护的范围。
参考图1，图1是本发明实施例提供的一种SRVCC切换的方法流程图。如图1所示，所述方法包括以下步骤：
步骤101，代理-呼叫会话控制功能P-CSCF设备在接收到会话建立消息的情况下，所述P-CSCF设备获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
可选地，所述P-CSCF设备在接收到会话建立消息时，所述代理呼叫会话控制(Proxy-Call Session Control Function，P-CSCF设备)获取STN-SR，包括：
所述P-CSCF设备在接收到UE(User Equipment，用户设备)发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
所述紧急呼叫目的地址，用户接入位置信息，用户卡标识，用户设备标识。
所述紧急呼叫目的地址包括紧急呼叫会话控制功能(Emergency–Call Session Control Function，E-CSCF)设备的地址或者紧急接入切换功能(Emergency Access Transfer Function，EATF)设备的地址。
具体的，类似于通过如下一个表得到STN-SR：
Figure PCTCN2014089662-appb-000001
其中紧急目的地址和用户接入位置信息都是从SIP中获取的。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的的下述信息中的一种或者多种生成STN-SR：
所述P-CSCF设备发送所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
其中，下一跳网元的地址是初始请求发直接发送到下一个网元，比如图2中PCSCF/ATCF设备是UE的下一跳网元，E-CSCF设备是P-CSCF设备/ATCF设备的下一跳网元，EATF设备是E-CSCF设备的下一跳网元，而PCSCF/ATCF设备是E-CSCF设备的上一跳网元，E-CSCF设备是EATF设备的上一跳网元。
所述注册时用户选择的会话锚定设备的地址可以是接入切换控制功能(Access Transfer Control Function，ATCF)设备的地址。
其中，所述紧急呼叫的目的地址为拨打紧急呼叫号码例如110、119等所对应的目的地址，所述用户接入位置信息为P-Acces-Network-Info，所述用户卡标识是指移动终端如手机的通用用户识别模块(Universal Subscriber Identity Module，USIM)或者IP多媒体服务身份模块(IP Multimedia Services Identity Module，IMSI)，所述用户设备标识是指移动终端如手机的国际移动设备身份码(International Mobile Equipment Identity，IMEI)。
具体地，参考图2，图2是本发明实施例提供的一种SRVCC切换的方法示意图。
如图2所示，步骤4.1，用户发起紧急呼叫时，发送呼叫建立请求给IMS网络中的P-CSCF设备；
步骤4.2，P-CSCF设备判断为紧急呼叫，发送呼叫建立请求给E-CSCF设备再路由给EATF设备，所述E-CSCF设备或者EATF设备保留呼叫路径，为后续执行紧急呼叫的切换过程做好准备；
步骤4.3，所述E-CSCF设备或者EATF设备将所述呼叫路径发送给紧急呼叫中心PSAP。
步骤7.1，所述P-CSCF设备使用预先配置的数据生成的STN-SR，所述P-CSCF设备将所述STN-SR发送到PCRF设备；
步骤7.2，所述服务网关(Serving GateWay，S-GW)或者分组数据网(Packet Data Network，P-GW)将所述STN-SR发送到MME存储；
步骤7.3，所述MME存储所述STN-SR。
步骤5.1，基站eNodeB向MME发送切换请求；
步骤5.2，MME发送切换请求时，优先使用MME保存的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤5.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤5.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到E-CSCF设备或者EATF设备。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE的紧急呼叫会话建立请求时，向所述会话锚定设备方向发送所述紧急呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
具体的，参考图2，在步骤7.1中，P-CSCF设备可以从E-CSCF设备或者EATF设备的SIP响应消息中获取STN-SR，并发送给PCRF设备。
同时，具体的，可以参考图3，图3是在紧急呼叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的方法示意图。如图3所示：
步骤301，用户发起紧急呼叫时，发送呼叫建立请求INVITE给IMS网络中的P-CSCF设备；
步骤302，P-CSCF设备判断为紧急呼叫，发送呼叫建立请求给E-CSCF设备.
步骤303，E-CSCF设备将所述呼叫请求发送给EATF设备，通知紧急呼叫发生。
步骤304，EATF设备处理INVITE，并保留在呼叫路径中，为后续执行紧急呼叫的切换过程做好准备，然后将所述呼叫发送给E-CSCF设备继续路由。
步骤305，E-CSCF设备将所述呼叫路径发送给紧急呼叫中心PSAP。
步骤306，E-CSCF设备收到INVITE请求的183响应，消息中携带被叫的媒体信息，前传响应给EATF设备。
步骤307，EATF设备收到183响应后，处理完成183响应后，前传响应给E-CSCF设备。并在消息中提供用于切换的STN-SR。
步骤308，E-CSCF设备收到EATF设备的183响应后，前传给P-CSCF设备。
步骤309，P-CSCF设备收到183响应后，根据消息中的媒体信息，执行服 务质量(Quality of Service，QoS)控制过程，同时在控制请求中提供STN-SR参数。
步骤310，P-CSCF设备完成处理后，发送183响应给主叫UE；
步骤311，MME发起切换时，向eMSC(enhanced MSC server，增强移动交换中心服务器)发送切换请求，并在请求消息中携带保存的STN-SR。
步骤312，eMSC根据STN-SR，路由切换的INVITE请求给EATF设备所在域的I-CSCF设备。
步骤313，I-CSCF设备根据STN-SR将请求消息路由给ETAF设备，ETAF设备根据STN-SR执行切换处理，并关联切换会话和原会话。
参考图4，图4是在紧急呼叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的另一种方法示意图。如图4所示：
步骤401，用户发起紧急呼叫时，发送呼叫建立请求INVITE给IMS网络中的P-CSCF设备；
步骤402，P-CSCF设备判断为紧急呼叫，发送呼叫建立请求给E-CSCF设备，转发消息前，判断需要进行本地媒体锚定，在呼叫路径中插入ATCF设备，直接将消息路由给ATCF设备。
步骤403，ATCF设备收到消息后，保留在呼叫路径中，为后续执行紧急呼叫的切换过程做好准备，继续将请求路由给E-CSCF设备。
步骤404，E-CSCF设备将所述呼叫请求发送给EATF设备，通知紧急呼叫发生。
步骤405，EATF设备处理INVITE，并保留在呼叫路径中，为后续执行紧急呼叫的切换过程做好准备，然后将所述呼叫发送给E-CSCF设备继续路由。
步骤406，E-CSCF设备将所述呼叫路径发送给紧急呼叫中心PSAP。
步骤407，E-CSCF设备收到INVITE请求的183响应，消息中携带被叫的媒体信息，前传响应给EATF设备。
步骤408，EATF设备收到183响应后，处理完成183响应后，前传响应给E-CSCF设备。
步骤409，E-CSCF设备收到EATF设备的183响应后，前传给ATCF设备。
步骤410，ATCF设备收到E-CSCF设备的183响应后，前传给P-CSCF设 备。并在消息中提供用于切换的STN-SR。
步骤411，P-CSCF设备收到183响应后，根据消息中的媒体信息，执行QoS控制过程，同时在控制请求中提供STN-SR参数。
步骤412，P-CSCF设备完成处理后，发送183响应给主叫UE。
步骤413，MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR。
步骤414，eMSC根据STN-SR，路由切换的INVITE请求给ATCF设备所在域的I-CSCF设备。
步415，I-CSCF设备根据STN-SR将请求消息路由给ATCF设备，ATCF设备根据STN-SR执行切换处理，并关联切换会话和原会话。
参考图5，图5是本发明实施例提供的一种SRVCC切换的方法示意图。如图5所示，步骤4.1，用户发起紧急呼叫时，发送呼叫建立请求给IMS网络中的P-CSCF设备；
步骤4.2，P-CSCF设备将所述呼叫建立请求发送到ATCF设备；
步骤4.3，将所述呼叫建立请求发送到E-CSCF设备或者EATF设备；
步骤4.4，所述E-CSCF设备或者EATF设备将所述呼叫建立请求发送到PSAP。
步骤7.1，ATCF设备在SIP响应消息中携带STN-SR给P-CSCF设备，所述P-CSCF设备将所述STN-SR发送到PCRF设备；
步骤7.2，所述PCRF设备将所述STN-SR发送到所述S-GW或者P-GW；
步骤7.3，所述S-GW或者P-GW将所述STN-SR发送到MME，以使得所述MME存储所述STN-SR。
步骤5.1，基站eNodeB向MME发送切换请求；
步骤5.2，MME发送切换请求时，优先使用MME保存的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤5.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤5.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到ATCF设备。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备 获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据所述紧急呼叫回叫会话Emergency PSAP(Public Safety Answering Point)callback建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
发送所述紧急呼叫回叫会话Emergency PSAP(Public Safety Answering Point)callback建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
所述注册时用户选择的会话锚定设备的地址可以是ATCF设备地址或者ATGW地址。
具体的，参考图6，图6是本发明实施例提供的一种SRVCC切换的方法示意图。
步骤6.1，在紧急呼叫回叫会话的建立过程中，PSAP将回叫会话请求发送到I-CSCF设备；
步骤6.2，所述I-CSCF设备将所述回叫会话请求发送到S-CSCF设备；
步骤6.3，S-CSCF设备触发AS(Application Server，应用服务器)执行业务控制，包括业务连续性的业务控制，然后AS将会话路由回S-CSCF设备；
步骤6.4，所述S-CSCF设备将所述回叫会话请求发送到ATCF设备；
步骤6.5，所述ATCF设备将所述回叫会话请求发送到P-CSCF设备；
步骤6.6，所述P-CSCF设备将所述回叫会话请求发送到用户设备UE。
步骤7.1，所述P-CSCF设备使用预先配置的数据生成的STN-SR，所述P-CSCF设备将所述STN-SR发送到PCRF设备；
步骤7.2，所述PCRF设备将所述STN-SR发送到S-GW或者P-GW；
步骤7.3，所述S-GW或者P-GW将所述STN-SR发送到MME存储。
步骤2.1，基站eNodeB向MME发送切换请求；
步骤2.2，MME发送切换请求时，优先使用MME保存的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤2.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤2.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到ATCF设备。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取STN-SR。
具体的，参考图7，图7是本发明实施例提供的一种在紧急呼叫回叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的方法流程图。如图7所示，
步骤701、S-CSCF设备收到被叫初始会话建立请求INVITE，S-CSCF设备执行被叫AS触发过程，包括触发SCC(Service Centralization and Continuity，服务集中和连续性)AS的过程，S-CSCF设备发送被叫的初始会话建立请求INVITE给AS；
步骤702、SCC AS收到初始会话建立请求INVITE，SCC AS处理会话信息，并保留在呼叫路径中，然后前传初始会话建立请求INVITE给S-CSCF设备；
步骤703、S-CSCF设备收到SCC AS前传回来的初始会话建立INVITE请求，S-CSCF设备发送被叫侧的ATCF设备；
步骤704、ATCF设备收到用户的会话建立请求，保留在呼叫路径中，并前传初始会话建立请求INVITE给P-CSCF设备。并在消息中提供STN-SR；
步骤705、P-CSCF设备收到初始会话建立INVITE请求，前转给UE；
步骤706、UE收到初始会话建立INVITE请求，返回183响应给P-CSCF设备。响应消息可以携带媒体信息；
步骤707、P-CSCF设备收到183响应，执行QoS控制过程，
步骤708，P-CSCF设备转发响应给ATCF设备。
步骤709、ATCF设备收到183响应，并转发响应给S-CSCF设备；
步骤710、S-CSCF设备收到183响应，转发给SCC AS；
步骤711、SCC AS收到183响应后，转发给S-CSCF设备；
步骤712、S-CSCF设备收到SCC AS的183响应后，转发给主叫侧；
步骤713、MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR。
步骤714、eMSC根据STN-SR，路由切换的INVITE请求给ATCF设备所在域的I-CSCF设备。
步骤715、I-CSCF设备根据STN-SR将请求消息路由给ATCF设备，ATCF设备关联切换会话和原会话，执行切换处理。
在紧急呼叫回叫会话的建立过程中，SCC AS在SIP请求消息中携带STN-SR给P-CSCF设备。
参考图8，图8是本发明实施例提供的在紧急呼叫回叫场景下P-CSCF设备获取SRVCC的会话切换号码STN-SR的另一种方法流程图。如图8所示，
步骤801、S-CSCF设备收到被叫初始会话建立请求INVITE，S-CSCF设备执行被叫AS触发过程，包括触发SCC AS的过程；
步骤802，S-CSCF设备发送被叫的初始会话建立请求INVITE给AS；
步骤803、SCC AS收到初始会话建立请求INVITE，SCC AS处理会话信息，并保留在呼叫路径中，然后前传初始会话建立请求INVITE给S-CSCF设备，并在消息中提供STN-SR；
步骤804，S-CSCF设备向I-CSCF设备发送初始会话建立请求INVITE；
步骤805、P-CSCF设备收到初始会话建立INVITE请求，前转给UE；
步骤806、UE收到初始会话建立INVITE请求，返回183响应给P-CSCF设备，响应消息可以携带媒体信息。
步骤807、P-CSCF设备收到183响应，执行QoS控制过程，并转发响应给S-CSCF设备；
步骤808、S-CSCF设备收到183响应，转发给SCC AS；
步骤809、SCC AS收到183响应后，转发给S-CSCF设备；
步骤810、S-CSCF设备收到SCC AS的183响应后，转发给主叫侧；
步骤811、MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR；
步骤812、eMSC根据STN-SR，路由切换的INVITE请求给SCC AS所在域的I-CSCF设备；
步骤813、I-CSCF设备根据STN-SR将请求消息路由给SCC AS，SCC AS根据STN-SR执行切换处理，并关联切换会话和原会话。
参考图9，图9是本发明实施例提供的一种SRVCC切换的方法示意图。如图9所示，
步骤6.1，在紧急呼叫回叫会话的建立过程中，PSAP将回叫会话请求发送到I-CSCF设备；
步骤6.2，所述I-CSCF设备将所述回叫会话请求发送到S-CSCF设备；
步骤6.3，S-CSCF设备触发AS执行业务控制，包括业务连续性的业务控制，然后AS将会话路由回S-CSCF设备。请求中携带STN-SR；
步骤6.4，所述S-CSCF设备将所述回叫会话请求发送到P-CSCF设备；
步骤6.5，所述P-CSCF设备将所述回叫会话请求发送到用户设备UE。
步骤7.1，所述P-CSCF设备将所述STN-SR发送到PCRF设备；
步骤7.2，所述PCRF设备将所述STN-SR发送到S-GW或者P-GW；
步骤7.3，所述S-GW或者P-GW将所述STN-SR发送到MME。
步骤2.1，基站eNodeB向MME发送切换请求；
步骤2.2，MME发送切换请求时，优先使用MME保存的从PCRF设备获取的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤2.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤2.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到AS。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述 STN-SR；
用户接入位置信息，用户卡标识，用户设备标识；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
所述会话锚定设备的地址包括ATCF设备地址或者ATGW地址。
参考图10，图10是本发明实施例提供的一种SRVCC切换的方法示意图。如图10所示，步骤2.1，用户向P-CSCF设备发送普通呼叫请求；
步骤2.2，所述P-CSCF设备向ATCF设备发送普通呼叫请求；
步骤2.3，所述ATCF设备向所述S-CSCF设备发送普通呼叫请求；
步骤2.4，S-CSCF设备触发AS执行业务控制，包括业务连续性的业务控制，然后AS将会话路由回S-CSCF设备；
步骤2.5，所述S-CSCF设备将所述普通呼叫请求发送到Callee。
步骤7.1，所述P-CSCF设备使用预先配置的数据生成的STN-SR，并将所述STN-SR发送到PCRF设备；
步骤7.2，所述PCRF设备将所述STN-SR发送到S-GW或者P-GW；
步骤7.3，所述S-GW或者P-GW将所述STN-SR发送到MME。
步骤3.1，基站eNodeB向MME发送切换请求；
步骤3.2，MME发送切换请求时，优先使用MME保存的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤3.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤3.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到ATCF设备。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR:
上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
具体的，参考图11，图11是本发明实施例提供的一种主叫场景下有ATCF设备的获取STN-SR的方法流程图。
步骤1101，用户发起普通呼叫时，发送初始会话建立请求INVITE给IMS网络中的P-CSCF设备；
步骤1102，P-CSCF设备转发初始会话建立请求INVITE给ATCF设备。
步骤1103，ATCF设备收到消息后，为后续执行普通呼叫的切换过程做好准备，然后将初始会话建立请求INVITE路由给S-CSCF设备。
步骤1104，S-CSCF设备将所述初始会话请求INVITE触发给SCC AS。
步骤1105，SCC AS处理INVITE，并保留在呼叫路径中，为后续执行普通呼叫的切换过程做好准备，然后将所述初始会话建立请求INVITE发送给S-CSCF设备继续路由。
步骤1106，S-CSCF设备将所述呼叫路径发送给被叫侧。
步骤1107，S-CSCF设备收到INVITE请求的183响应，消息中携带被叫的媒体信息，前传响应给SCC AS。
步骤1108，SCC AS收到183响应后，处理完成183响应后，前传响应给S-CSCF设备。
步骤1109，S-CSCF设备收到SCC AS的183响应后，前传给ATCF设备。
步骤1110，ATCF设备收到S-CSCF设备的183响应后，前传给P-CSCF设备。并在消息中提供用于切换的STN-SR。
步骤1111，P-CSCF设备收到183响应后，根据消息中的媒体信息，执行QoS控制过程，同时在控制请求中提供STN-SR参数。
步骤1112，P-CSCF设备完成处理后，发送183响应给主叫UE。
步骤1113，MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR。
步骤1114，eMSC根据STN-SR，路由切换的INVITE请求给ATCF设备所在域的I-CSCF设备。
步骤1115，I-CSCF设备根据STN-SR将请求消息路由给ATCF设备，ATCF设备根据STN-SR执行切换处理，并关联切换会话和原会话。
具体的，参考图12，图12是本发明实施例提供的在主叫场景下获取STN-SR的另一种方法流程图。
步骤1201，用户发起普通呼叫时，发送初始会话建立请求INVITE给IMS网络中的P-CSCF设备；
步骤1202，P-CSCF设备转发初始会话建立请求INVITE给S-CSCF设备。
步骤1203，S-CSCF设备将所述初始会话请求INVITE触发给SCC AS。
步骤1204，SCC AS处理INVITE，并保留在呼叫路径中，为后续执行普通呼叫的切换过程做好准备，然后将所述初始会话建立请求INVITE发送给S-CSCF设备继续路由，并在消息中提供用于切换的STN-SR。
步骤1205，S-CSCF设备将所述呼叫路径发送给被叫侧。
步骤1206，S-CSCF设备收到INVITE请求的183响应，消息中携带被叫的媒体信息。
步骤1207，S-CSCF设备将183响应给SCC AS。
步骤1208，SCC AS收到183响应后，处理完成183响应后，前传响应给S-CSCF设备，并在183响应中携带STN-SR。
步骤1209，S-CSCF设备收到SCC AS的183响应后，前传给P-CSCF设备。
步骤1210，P-CSCF设备收到183响应后，根据消息中的媒体信息，执行QoS控制过程，同时在控制请求中提供STN-SR参数。P-CSCF设备完成处理后，发送183响应给主叫UE。
步骤1211、MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR；
步骤1212：eMSC根据STN-SR，路由切换的INVITE请求给SCC AS所在域的I-CSCF设备。
步骤1213：I-CSCF设备根据STN-SR将请求消息路由给SCC AS，SCC AS根据STN-SR执行切换处理，并关联切换会话和原会话。
可选地，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
所述P-CSCF设备接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
具体的，参考图13，图13是本发明实施例提供的在被叫场景下获取STN-SR的方法流程图。
步骤1301、S-CSCF设备收到被叫初始会话建立请求INVITE，S-CSCF设备执行被叫AS触发过程，包括触发SCC AS的过程，S-CSCF设备发送被叫的初始会话建立请求INVITE给AS；
步骤1302、SCC AS收到初始会话建立请求INVITE，SCC AS处理会话信息，并保留在呼叫路径中，然后前传初始会话建立请求INVITE给S-CSCF设备；
步骤1303、S-CSCF设备收到SCC AS前传回来的初始会话建立INVITE请求，S-CSCF设备发送被叫侧的ATCF设备；
步骤1304、ATCF设备收到用户的会话建立请求，保留在呼叫路径中。
步骤1305、ATCF设备前传初始会话建立请求INVITE给P-CSCF设备，并在消息中提供STN-SR；
步骤1306、P-CSCF设备收到初始会话建立INVITE请求，前转给UE；
步骤1307、UE收到初始会话建立INVITE请求，返回183响应给P-CSCF设备。响应消息可以携带媒体信息；
步骤1308、P-CSCF设备收到183响应，执行QoS控制过程，并转发响应给ATCF设备。
步骤1309、ATCF设备收到183响应，并转发响应给S-CSCF设备；
步骤1310、S-CSCF设备收到183响应，转发给SCC AS；
步骤1311、SCC AS收到183响应后，转发给S-CSCF设备；
步骤1312、S-CSCF设备收到SCC AS的183响应后，转发给主叫侧；
步骤1313、MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR。
步骤1314、eMSC根据STN-SR，路由切换的INVITE请求给ATCF设备所在域的I-CSCF设备。
步骤1315、I-CSCF设备根据STN-SR将请求消息路由给ATCF设备，ATCF设备关联切换会话和原会话，执行切换处理。
参考图14，图14是本发明实施例提供的一种在被叫场景下获取STN-SR的方法流程图。
步骤1401、S-CSCF设备收到被叫初始会话建立请求INVITE，S-CSCF设备执行被叫AS触发过程，包括触发SCC AS的过程，S-CSCF设备发送被叫的初始会话建立请求INVITE给AS；
步骤1402、SCC AS收到初始会话建立请求INVITE，SCC AS处理会话信息，并保留在呼叫路径中。
步骤1403，SCC AS前传初始会话建立请求INVITE给S-CSCF设备，并在消息中提供STN-SR。
步骤1404、S-CSCF设备收到SCC AS前传回来的初始会话建立INVITE请求，S-CSCF设备发送被叫侧的P-CSCF设备。
步骤1405、P-CSCF设备收到初始会话建立INVITE请求，前转给UE；
步骤1406、UE收到初始会话建立INVITE请求，返回183响应给P-CSCF设备。响应消息可以携带媒体信息；
步骤1407、P-CSCF设备收到183响应，执行QoS控制过程，同时在控制请求中提供STN-SR参数，并转发响应给S-CSCF设备。
步骤1408、S-CSCF设备收到183响应，转发给SCC AS；
步骤1409、SCC AS收到183响应后，转发给S-CSCF设备；
步骤1410、S-CSCF设备收到SCC AS的183响应后，转发给主叫侧；
步骤1411、MME发起切换时，向eMSC发送切换请求，并在请求消息中携带保存的STN-SR；
步骤1412、eMSC根据STN-SR，路由切换的INVITE请求给SCC AS所在域的I-CSCF设备；
步骤1413、I-CSCF设备根据STN-SR将请求消息路由给SCC AS，SCC AS根据STN-SR执行切换处理，并关联切换会话和原会话。
具体的，参考图15，图15是本发明实施例提供的一种SRVCC切换的方法示意图。如图15所示，步骤2.1，用户向P-CSCF设备发送普通呼叫请求；
步骤2.2，所述P-CSCF设备向ATCF设备发送普通呼叫请求；
步骤2.3，所述ATCF设备向所述S-CSCF设备发送普通呼叫请求；
步骤2.4，S-CSCF设备触发AS执行业务控制，包括业务连续性的业务控制，然后AS将会话路由回S-CSCF设备；
步骤2.5，所述S-CSCF设备将所述普通呼叫请求发送到Callee。
步骤7.1，所述AS在SIP请求消息中携带STN-SR，并将所述STN-SR发送到PCSCF，P-CSCF设备获取到消息中的STN-SR，将STN-SR发送给PCRF设备；
步骤7.2，所述PCRF设备将所述STN-SR发送到S-GW或者P-GW；
步骤7.3，所述S-GW或者P-GW将所述STN-SR发送到MME。
步骤3.1，基站eNodeB向MME发送切换请求；
步骤3.2，MME发送切换请求时，优先使用MME保存的从PCRF设备获取的STN-SR，将所述STN-SR发送到SRVCC IWF设备；
步骤3.3，所述SRVCC IWF设备将所述STN-SR发送到I-CSCF设备；
步骤3.4，所述I-CSCF设备根据所述STN-SR将切换请求准确路由到ATCF设备。
步骤102，所述P-CSCF设备向移动管理实体MME发送Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在所述UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
具体的，参考图16，图16是本发明实施例提供的一种SRVCC切换的方法示意图。如图16所示，在会话建立请求session setup procedure中P-CSCF设备将STN-SR发送到PCRF设备，所述PCRF设备通过S/P-GW将所述STN-SR发送到MME，所述MME存储所述STN-SR，当所述MME发起切换请求时，优先根据该STN-SR将所述切换请求路由到目的地。
具体的，参考图17，图17是本发明实施例提供的一种SRVCC切换的方法示意图。如图17所示，
步骤1701，P-CSCF向PCRF设备发送Qos控制消息，所述Qos控制消息中携带STN-SR；
步骤1702，PCRF设备向S-GW或者P-GW发送所述Qos控制消息；
步骤1703，S-GW或者P-GW向所述MME发送建立会话请求，并在所述建立会话请求中携带STN-SR；
步骤1704，所述MME向所述S-GW或者P-GW发送所述建立会话请求的响应。本发明实施例提供一种SRVCC切换的方法，所述方法中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
参考图18，图18是本发明实施例提供的一种单一无线语音通话连续性SRVCC切换的方法流程图。所述方法包括以下步骤：
步骤1801，MME接收P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
步骤1802，所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
具体的，参考图16和图17的描述，在此不再赘述。
本发明实施例提供一种SRVCC切换的方法，所述方法中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
参考图19，图19是本发明实施例提供的一种代理-呼叫会话控制功能P-CSCF设备结构图。如图19所示，所述设备包括：
获取单元1901，用于在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
发送单元1902，用于向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
可选地，所述获取单元1901，具体用于：
在接收到UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
可选地，所述获取单元1901，具体用于：
在接收到UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
其中，下一跳网元的地址是初始请求发直接发送到下一个网元，比如图2中PCSCF/ATCF设备是UE的下一跳网元，E-CSCF设备是P-CSCF设备/ATCF设备的下一跳网元，EATF设备是E-CSCF设备的下一跳网元，而PCSCF/ATCF 设备是E-CSCF设备的上一跳网元，E-CSCF设备是EATF设备的上一跳网元。
所述注册时用户选择的会话锚定设备的地址可以是接入切换控制功能(Access Transfer Control Function，ATCF)设备的地址。
其中，所述紧急呼叫的目的地址为拨打紧急呼叫号码例如110、119等所对应的目的地址，所述用户接入位置信息为P-Acces-Network-Info，所述用户卡标识是指移动终端如手机的通用用户识别模块(Universal Subscriber Identity Module，USIM)或者IP多媒体服务身份模块(IP Multimedia Services Identity Module，IMSI)，所述用户设备标识是指移动终端如手机的国际移动设备身份码(International Mobile Equipment Identity，IMEI)。
具体的，参考图2的描述，在此不再赘述。
可选地，所述获取单元1901，具体用于：
在接收到UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
具体的，参考图3、图4、图5的描述，在此不再赘述。
可选地，所述获取单元1901，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
可选地，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
具体的，参考图6、图7、图8、图9的描述，在此不再赘述。
可选地，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取STN-SR。
可选地，所述获取单元，具体用于：
在接收到所述UE发送的普通呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识；
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
可选地，所述获取单元，具体用于：
在接收到UE发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR:
上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
可选地，所述获取单元，具体用于：
在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
可选地，所述获取单元，具体用于：
在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
具体的，参考图10-图15的描述，在此不再赘述。
本发明实施例提供一种SRVCC切换的设备，所述设备中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
参考图20，图20是本发明实施例提供的一种移动管理实体MME的设备结构图，所述MME包括：
接收单元2001，用于接收P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
发送单元2002，用于在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
具体的，参考图16和图17的描述，在此不再赘述。
本发明实施例提供一种SRVCC切换的设备，所述设备中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
参考图21，图21是一种单待语音连续SRVCC切换的系统结构图。所述系统包括代理-呼叫会话控制功能P-CSCF设备2101以及移动管理实体MME2102，其中，
所述P-CSCF设备2101，用于在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；向移动管理实体MME 2102发送服务质量Qos控制消息时， 在所述Qos控制消息中携带所述STN-SR，以通知所述MME 2102在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
所述MME2102，用于接收P-CSCF设备2101发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
本发明实施例提供一种SRVCC切换的系统，所述系统中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
图22是本发明实施例提供的一种P-CSCF的结构示意图。参考图22，图22是本发明实施例提供的一种设备2200，本发明具体实施例并不对所述设备的具体实现做限定。所述设备2200包括：
处理器(processor)2201，通信接口(Communications Interface)2202，存储器(memory)2203，总线2204。
处理器2201，通信接口2202，存储器2203通过总线2204完成相互间的通信。
通信接口2202，用于与其他设备进行通信；
处理器2201，用于执行程序。
具体地，程序可以包括程序代码，所述程序代码包括计算机操作指令。
处理器2201可能是一个中央处理器(central processing unit，CPU)，或者是特定集成电路ASIC(Application Specific Integrated Circuit)，或者是被配置成实施本发明实施例的一个或多个集成电路。
存储器2203，用于存储程序。存储器2203可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)，或者非易失性存储器(non-volatile memory)，例如只读存储器(ead-only memory，ROM)，快闪存储器(flash memory)，硬盘(hard disk drive，HDD)或固 态硬盘(solid-state drive，SSD)。处理器2201根据存储器2203存储的程序指令，执行以下方法：
代理-呼叫会话控制功能P-CSCF设备在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
所述P-CSCF设备向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取STN-SR。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR:
上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
所述P-CSCF设备接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
所述P-CSCF设备接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
其中，需要说明的是，图21中的MME 2102也可以具有与图22中P-CSCF设备相同的结构，当MME 2102中的处理器执行存储器中存储的程序指令时可 以实现如下方法：
接收P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；在用户设备UE发起切换时，根据所述STN-SR向会话锚定设备发送切换请求。
本发明实施例提供一种SRVCC切换的设备，所述设备中P-CSCF设备获取SRVCC的会话切换号码STN-SR，并将所述STN-SR发送到PCRF设备，以使得所述PCRF设备将所述STN-SR发送到MME进行存储，从而通过简洁的方法确保I-CSCF设备选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备和呼叫建立选择到的E-CSCF设备EATF设备E-CSCF设备/EATF设备设备保持一致。
通过以上的实施方式的描述可知，所属领域的技术人员可以清楚地了解到本发明可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括RAM、ROM、EEPROM、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字用户线(DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本发明所使用的，盘(Disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常磁性的复制数据，而碟则用激光来光学的复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实 施例的不同之处。尤其，对于装置实施例而言，由于其基本相似于方法实施例，所以描述得比较简单，各单元具体功能的执行过程参见方法实施例的部分说明即可。以上所描述的装置实施例仅仅是示意性的，其中作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。本领域普通技术人员在不付出创造性劳动的情况下，即可以理解并实施。
总之，以上所述仅为本发明技术方案的较佳实施例而已，并非用于限定本发明的保护范围。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (25)

  1. 一种单一无线语音通话连续性SRVCC切换的方法，其特征在于，所述方法包括：
    代理-呼叫会话控制功能P-CSCF设备在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
    所述P-CSCF设备向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在用户设备UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
  2. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
    所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
  3. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
    接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  4. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包 括：
    所述P-CSCF设备在接收到所述UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
    所述P-CSCF设备接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
  5. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
    所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
  6. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
    发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  7. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取所述STN-SR。
  8. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到 会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述UE发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
    用户接入位置信息，用户卡标识，用户设备标识；
    所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
    用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
  9. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR:
    上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
    所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，所述P-CSCF设备根据下述信息中的一种或者多种生成所述STN-SR；
    下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  10. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
    所述P-CSCF设备接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
  11. 根据权利要求1所述的方法，其特征在于，所述P-CSCF设备在接收到会话建立消息时，所述P-CSCF设备获取SRVCC的会话切换号码STN-SR，包括：
    所述P-CSCF设备在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向所述UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
    所述P-CSCF设备接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
  12. 一种单一无线语音通话连续性SRVCC切换的方法，其特征在于，所述方法包括：
    移动管理实体MME接收代理-呼叫会话控制功能P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
    所述MME在用户设备UE发起切换时，根据所述STN-SR向会话锚定设备发送切换请求。
  13. 一种代理-呼叫会话控制功能P-CSCF设备，其特征在于，所述设备包括：
    获取单元，用于在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；
    发送单元，用于向移动管理实体MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在用户设备UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
  14. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述UE发送的紧急呼叫会话建立请求的情况下，根据所述紧急呼叫会话建立请求中携带的下述信息中的一种或者多种生成STN-SR：
    所述紧急呼叫的目的地址，用户接入位置信息，用户卡标识，用户设备标识。
  15. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述UE发送的紧急呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成STN-SR：
    接收所述P-CSCF设备发送的所述紧急呼叫会话建立请求的下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  16. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述UE发送的紧急呼叫会话建立请求时，向所述会话锚定设备发送所述紧急呼叫会话建立请求；
    接收所述会话锚定设备发送的紧急呼叫会话建立请求的响应消息，所述紧急呼叫会话建立请求的响应消息中携带所述STN-SR。
  17. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述紧急呼叫回叫会话建立请求中携带的下述信息中的一种或者多种生成所述STN-SR；
    所述会话锚定设备的地址，用户接入位置信息，用户卡标识，用户设备标识。
  18. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
    发送所述紧急呼叫回叫会话建立请求给所述P-CSCF设备的网元地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  19. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述会话锚定设备发送的紧急呼叫回叫会话建立请求的情况下，根据所述会话锚定设备发送的紧急呼叫回叫会话建立请求获取所述STN-SR。
  20. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述UE发送的普通呼叫会话建立请求的情况下，根据预先存储的下述信息中的一种或者多种生成所述STN-SR；
    用户接入位置信息，用户卡标识，用户设备标识；
    在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
    用户接入位置信息，用户卡标识，用户设备标识，所述会话锚定设备的地址。
  21. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到UE发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR:
    上一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址；
    在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，根据下述信息中的一种或者多种生成所述STN-SR；
    下一跳网元的地址，注册时用户选择的会话锚定设备的地址，用户未注册时选择的会话锚定设备的地址。
  22. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到UE发送的普通呼叫会话建立请求的情况下，向所述会话锚定设备发送所述普通呼叫会话建立请求；
    接收所述会话锚定设备发送的所述普通呼叫会话建立请求的响应消息，所述普通呼叫会话建立请求的响应消息中携带所述STN-SR。
  23. 根据权利要求13所述的P-CSCF设备，其特征在于，所述获取单元，具体用于：
    在接收到所述会话锚定设备发送的普通呼叫会话建立请求的情况下，向UE发送所述普通呼叫会话建立请求，所述普通呼叫会话建立请求中携带STN-SR；
    接收所述UE发送的所述普通呼叫会话建立请求的响应消息，向所述会话锚定设备发送所述普通呼叫会话建立请求的响应消息。
  24. 一种移动管理实体MME，其特征在于，所述MME包括：
    接收单元，用于接收代理-呼叫会话控制功能P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；
    发送单元，用于在UE发起切换时，根据所述STN-SR向会话锚定设备发送切换请求。
  25. 一种单待语音连续SRVCC切换的系统，其特征在于，所述系统包括代理-呼叫会话控制功能P-CSCF设备以及移动管理实体MME，其中，
    所述P-CSCF设备，用于在接收到会话建立消息的情况下，获取单一无线语音通话连续性SRVCC的会话切换号码STN-SR，所述会话建立消息包括会话建立请求或者会话建立请求的响应消息，所述STN-SR至少包括会话锚定设备的路由信息；向所述MME发送服务质量Qos控制消息时，在所述Qos控制消息中携带所述STN-SR，以通知所述MME在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
    所述MME，用于接收所述P-CSCF设备发送的服务质量Qos控制消息，所述Qos控制消息中携带STN-SR；在UE发起切换时，根据所述STN-SR向所述会话锚定设备发送切换请求。
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