WO2011026438A1 - Procédé, équipement et système de réseau pour transfert en mode voix inter-technologie d'accès radio - Google Patents

Procédé, équipement et système de réseau pour transfert en mode voix inter-technologie d'accès radio Download PDF

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Publication number
WO2011026438A1
WO2011026438A1 PCT/CN2010/076601 CN2010076601W WO2011026438A1 WO 2011026438 A1 WO2011026438 A1 WO 2011026438A1 CN 2010076601 W CN2010076601 W CN 2010076601W WO 2011026438 A1 WO2011026438 A1 WO 2011026438A1
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WIPO (PCT)
Prior art keywords
port
media
message
information
access network
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PCT/CN2010/076601
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English (en)
Chinese (zh)
Inventor
顾炯炯
聂鑫
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华为技术有限公司
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Publication of WO2011026438A1 publication Critical patent/WO2011026438A1/fr

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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

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a voice switching method, device, and network system across a wireless access technology.
  • the voice calls of mobile communication can be divided into the following two categories: The first type is the session type service carried by the Circuit (CS) domain; the second type is the Packet Service (PS) domain.
  • the session type service carried.
  • the 3GPP standards organization defines a Single Radio Voice Call Continuity (SRVCC) process to switch voice services from the PS domain to the CS domain.
  • the SRVCC process includes an Inter-R book AT handover (switching across wireless access technologies) process and an IMS session transfer process.
  • the inter-RAT handover may be performed first, and then the IMS session transfer may be performed, or the IMS session transfer may be performed before the inter-RAT handover is performed.
  • the interruption of the voice service is caused by the interruption delay of the media plane caused by the Inter-RAT handover. IMS session transfer? The sum of the interruptions of the media faces that have caused the user experience to deteriorate.
  • the embodiments of the present invention provide a voice switching method, a device, and a network system for wireless access technologies, which reduce the time of session interruption caused by handover and improve user experience.
  • a voice switching method for wireless access technologies including:
  • the media anchor in the IMS network receives a message indicating that the port is added, and the message indicating the added port is used to indicate that the media anchor increases a port that communicates with the target side circuit access network;
  • Receiving, by the second port, a downlink media stream from the second UE, and passing the downlink media stream A port is sent to the source side IP access network, and is sent to the target side to the network through the third port;
  • the media anchor receives a message indicating that the first port is unavailable, and controls not to send the downlink media stream from the second UE to the source side IP access network.
  • a media anchor including:
  • a message receiving unit configured to receive a message indicating that the port is added, where the message indicating the added port is used to indicate that the media anchor increases a port that communicates with the target side circuit access network; and receives a message indicating that the first port is unavailable;
  • a port allocating unit configured to add a third port as a port for communicating with the target side circuit access network according to the message indicating that the port is added according to the indication;
  • a media stream receiving unit configured to receive a downlink media stream from the second UE by using the second port, where the first media stream sending unit is configured to send the downlink media stream to the source IP access network by using the first port;
  • a second media stream sending unit configured to send the downlink media stream to the target side circuit access network by using the third port
  • control unit configured to: after receiving the message indicating that the first port is unavailable, control not to send the downlink media stream from the second UE to the source side IP access network.
  • a network system includes: a media anchor control network element and a media anchor point, where
  • the media anchor control network element is configured to receive a request message for the first update media information, and extract, from the request message of the first update media information, the SDP of the first UE in the target side circuit access network to join the indication increase port.
  • the message indicating the addition of the port is sent to the media anchor; after receiving the request message of the second update media information, the request message for determining the second update media information does not carry the first UE on the source side IP access network.
  • SDP sends a message indicating that the first port is unavailable to the media anchor;
  • the media anchor is configured to receive a message indicating that the port is added, add a third port as a port for communicating with the target side circuit access network according to the indication, and receive a downlink from the second UE by using the second port.
  • the media stream is sent to the source side IP access network through the first port, and is sent to the target side circuit access network through the third port; after receiving the message indicating that the first port is unavailable, the control is performed.
  • the downlink media stream from the second UE is not transmitted to the source side IP access network.
  • the media anchor sends the downlink media stream from the second UE to the source IP access network and the target side circuit access network simultaneously in the SRVCC handover process of the first UE, which eliminates the IMS Session transfer.
  • the media plane is interrupted, so that the SRVCC handover interruption delay does not include IMS Session transfer?
  • FIG. 1 is a flowchart of a method for switching voice over the radio access technology according to the first embodiment of the present invention
  • FIG. 2A is a media flow between the first UE and the second UE before the first UE performs SRVCC handover according to the first embodiment of the present invention
  • FIG. 2B is a first UE and a second UE when the first UE performs SRVCC handover according to Embodiment 1 of the present invention.
  • FIG. 2C is a schematic diagram of media stream transmission between a first UE and a second UE after a first UE performs SRVCC handover according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart of a voice switching method for a cross-radio access technology according to Embodiment 2 of the present invention
  • FIG. 4 is a flowchart of a voice switching method for a wireless access technology according to Embodiment 3 of the present invention
  • FIG. 6 is a flowchart of a voice switching method for a cross-radio access technology according to Embodiment 5 of the present invention
  • FIG. 7 is a cross-wire diagram provided by Embodiment 6 of the present invention
  • FIG. 8 is a flowchart of a voice switching method for a cross-radio access technology according to Embodiment 7 of the present invention
  • FIG. 9 is a voice switching function of an inter-radio access technology according to Embodiment 8 of the present invention
  • FIG. 10 is a flowchart of a voice switching method for a cross-radio access technology according to Embodiment 9 of the present invention
  • FIG. 11 is a schematic diagram of a SCC AS according to an embodiment of the present invention for knowing whether a media anchor control network element supports
  • FIG. 12 is a structural diagram of a media anchor provided by Embodiment 10 of the present invention.
  • Embodiment 1 Referring to FIG. 1, a first embodiment of the present invention provides a voice switching method for a wireless access technology, where the method includes:
  • IP Multimedia Subsystem The media anchor in the IMS network receives a message indicating an add port, and the message indicating the add port is used to indicate that the media anchor increases a port for communicating with the target side circuit access network.
  • the media anchor receives the message indicating that the port is sent by the media anchor control network element, and the media anchor control network element sends the message indicating that the port is added to the media anchor point under the control of the SCC AS.
  • the media anchor control network element may be a proxy call session control function (Proxy-CSCF, P-CSCF) or an Interconnection Border Control Function (IBCF), where the media anchor is a border session controller. (Session Border Controller, SBC), or the media anchor control network element is a media gateway control function (MGCF).
  • SBC Session Border Controller
  • MGCF media gateway control function
  • the media anchor point is a media gateway (MGGW) controlled by the MGCF.
  • the message of adding the port according to the indication is allocated, and the third port is allocated as a port for accessing the network communication with the target side circuit.
  • the media anchor allocates a third port (T3) as a port for communicating with the target side circuit access network according to the message indicating that the port is added, and sets a media stream between the second port (T2) and the third port (T3).
  • the direction is a one-way transmission, and the media stream transmission direction is an MGW controlled from the second UE to the SRVCC IWF, or the direction of the media stream between the second port (T2) and the third port (T3) may be set to be bidirectional.
  • the downlink media stream is received by the second UE by using the second port, and the downlink media stream is sent to the source IP access network by using the first port, and is connected to the target side circuit by using the third port.
  • the network sends.
  • the media anchor receives a message indicating that the first port is unavailable, and controls not to send the downlink media stream from the second UE to the source side IP access network.
  • the message indicating that the first port is unavailable in the step may be a message indicating that the first port is deleted; and the controlling not to send the downlink media stream from the second UE to the source side IP access network may be the first UE and the second UE. Delete the information of the first port in the context of the call.
  • the source side IP access network may include an E-UTRAN network, an MME, an S-GW, and a PDN GW; or the source side IP access network may include a PS domain of the UTRAN/GERAN network, and the SGSN. And GGSN.
  • the target side circuit access network includes: a CS domain of the UTRAN/GERAN network, an MSC, and a Base Station Subsystem (BSS) or an RNS.
  • BSS Base Station Subsystem
  • the media anchor receives the message indicating that the first port is deleted from the media anchor control network element, and the media anchor control network element sends a message indicating that the first port is deleted to the media anchor under the control of the SCC AS, SCC
  • the AS After receiving the notification message that the first UE completes the Inter-RAT handover sent by the SRVCC IWF, or after receiving the message sent by the P-CSCF serving the first UE, the AS sends a message indicating that the first UE is in the IMS network before the handover.
  • the control media anchor control network element After receiving the notification message sent by the HSS indicating that the first UE has completed the Inter-RAT handover, the control media anchor control network element sends a message indicating that the first port is deleted to the media anchor point.
  • the media anchor in the IMS network in the first embodiment of the present invention simultaneously sends the downlink media stream of the second UE to the source side IP access network and the target side electric wife into the network during the SRVCC handover process of the first UE, ensuring the first When a UE switches to the target side circuit to access the network, it can immediately receive the downlink media stream of the second UE, and eliminates the media plane interruption caused by the IMS Session transfer, thereby making the SRVCC
  • the S-CSCF serving the first UE needs to trigger the call to the SCC AS for anchoring, and then the call is routed to the P-CSCF serving the second UE.
  • the P-CSCF serving the second UE controls the media anchor to create a context for the call, ie, creates a call context of the first UE and the second UE, and adds T1 and T2 port information to the context, setting between the T1 and T2 ports
  • the media stream is transmitted in both directions.
  • the T1 port is used to communicate with the source side IP access network
  • the T2 port is used to communicate with the second UE; or the second UE is located in the CS domain, the call is routed to the MGCF serving the second UE, and is served by the second UE.
  • the MGCF controls the media anchor to create a context for the call; or when the second UE is in a different IMS domain or a Next Generation Network (NGN) network than the first UE, the media anchor is controlled by the IBCF serving the first UE.
  • NNN Next Generation Network
  • the point creates a context for the call.
  • the media stream transmission between the first UE and the second UE is as shown in FIG. 2A.
  • the SRVCC IWF can be implemented by the enhanced mobile switching control server (MSC server), that is, the SRVCC IWF and the MSC server are A unified device (a unified device indicates that the SRVCC IWF is on the same physical entity as the MSC server).
  • the SRVCC IWF can also include the function of the MGCF.
  • the SRVCC IWF, the MSC server and the MGCF are located on the same physical entity, so that the MGW controlled by the SRVCC IWF can be located on the same physical entity as the MGW of the MGCF (ie, the media anchor). It can reduce the delay of media plane transmission.
  • the SCC AS in the IMS network After receiving the IMS session transfer request sent by the SRVCC IWF, the SCC AS in the IMS network notifies the media anchor control network element to control the media anchor to add the T3 port to the context corresponding to the call (ie, the first UE and the second UE).
  • the media stream transmission direction between T3 and T2 is set to bidirectional transmission or unidirectional transmission (the unidirectional transmission direction of the media stream is from T2 to T3), thereby establishing a media anchor point to the target side of the SRVCC handover.
  • the media access path of the circuit access network (at this time, the media path is: media anchor T3 port SRVCC IWF controlled MGW target MSC controlled MGW destination UTRAN/GERAN circuit domain (Circuit Service, CS)), and will be the first
  • the downlink media stream of the UE is simultaneously sent to the source side IP access network and the target side electric wife into the network, as shown in FIG. 2B.
  • the media side path of the target side circuit network and the second UE has been established, and the SCC AS notifies the media anchor control network element to control the media anchor point deletion first.
  • the T1 port information in the call context of the UE and the second UE stops transmitting the downlink media stream to the source IP access network. If the media stream transmission direction between T2 and T3 is one-way transmission, the T2 and T3 are modified at this time.
  • the media stream transmission direction between the ports is bidirectional transmission, as shown in FIG. 2C.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a second embodiment of the present invention provides a voice switching method for a wireless access technology.
  • a first UE is required to perform SRVCC handover, and a second UE is located in the same IMS domain as the first UE, and the first UE is from the E.
  • the UTRAN is switched to the CS domain in the UTRAN/GERAN.
  • the method specifically includes:
  • the S-CSCF serving the first UE triggers the call to the SCC AS according to the Initial Filter Criteria (iFC) of the first UE, and serves the first UE during the call setup phase.
  • the S-CSCF routes the call to the I-CSCF, S-CSCF and P-CSCF serving the second UE, and sends the H.248 ADD to the media anchor for the P-CSCF served by the second UE.
  • a message carrying the indication information of adding the port T1 and the port T2, and the remote descriptor of the T1 (the SDP of the first UE in the source IP access network), and the remote descriptor of the T2 (the second UE) SDP).
  • the media anchor is a call setup context of the first UE to the second UE, that is, a call context of the first UE and the second UE, and the remote descriptor of T1 and the remote descriptor of T2 are added to the first UE and the second In the call context of the UE, the transmission direction of the media stream between T1 and T2 is set to be bidirectional.
  • the media anchor point may be based on the transmission direction of the media stream between the first port and the second port set in the call context of the first UE and the second UE, and the IP address of the first UE on the source side.
  • the SDP accessing the network sends the downlink media stream from the second UE to the source IP access network through the first port.
  • the first UE sends a measurement report to the E-UTRAN.
  • the E-UTRAN determines to switch the first UE to the CS domain according to the measurement, and sends a handover request (Handover Required) to the MME.
  • the MME performs Bearer Splitting to send a Forward Reloc Req (Rebound Req) to the SRVCC IWF.
  • the bearer separation is to identify the PS bearer carrying the voice and the PS bearer carrying the non-voice. This is to release the PS bearer containing the voice component after the SRVCC handover is completed.
  • the SRVCC IWF sends a Prepare HO Req to the MSC to request the MSC to prepare for the handover of the call of the first UE to the CS domain.
  • the MSC sends a handover request (Handover Req) to the RNS or the base station subsystem (BSS) to request the RNS or the BSS to prepare for the handover of the call of the first UE to the CS domain, where the MSC receives the RNS or the BSS.
  • Handover Ack Take RNS as an example.
  • the MSC sends a Prepare Handover Resp message to the SRVCC IWF.
  • the SRVCC IWF is established with the MSC.
  • the first UE sends a session transfer request message to the SCC AS.
  • the SCC AS returns an acknowledgement message to the SRVCC IWF for the session transfer request.
  • the SRVCC IWF sends a forward relocation response message to the MME (Forward Reloc) Resp), starting the Inter-RAT Handover process of the first UE.
  • #zhang can avoid media plane switching caused by session transfer due to premature activation of Inter-RAT Handover after Inter-RAT Handover.
  • the MME sends a handover command to the E-UTRAN.
  • the E-UTRAN sends a handover command to the first UE, where the first UE is instructed to switch from the E-UTRAN to the CS domain of the UTRAN/GERAN.
  • the SCC AS sends a relNVITE message to the second UE to request to update media information of the session, where the relNVITE message is a request message for updating the media information, where the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • SDP Offer SDP of the first UE on the source side IP access network, SDP of the SRVCC IWF/MGW.
  • the SDP of the side IP access network, the SDP of the SRVCC IWF/MGW indicates that the descriptor of the media gateway of the call needs to be updated to the SDP of the first UE in the source IP access network and the SDP of the MGW controlled by the SRVCC IWF.
  • the P-CSCF serving the second UE After receiving the relNVITE message sent by the SCC AS, the P-CSCF serving the second UE determines, according to the STN-SR, that the relNVITE message is a media plane update request of the SRVCC handover, and sends an H.248 ADD message to the media anchor.
  • the message is used to control the media anchor to allocate resources for the SRVCC handover request, and the remote descriptor of the T3 port allocated by the specified media anchor is the SDP of the SRVCC IWF/MGW.
  • the media anchor adds the remote descriptor of the T3 to the call context of the first UE and the second UE, and sets the topology relationship of T1 and ⁇ 2 to ⁇ Tl, ⁇ 2, and isolation ⁇ , that is, the T1 and ⁇ 2 are not connected.
  • the direction of the IWF/MGW The direction of the IWF/MGW.
  • the P-CSCF serving the second UE sends a 200 OK as a response to the SCC AS, and the SDP answer carried in the 200 OK is the related media information of the T3. 317.
  • the SCC AS sends a session migration completion message to the SRVCC IWF.
  • the SDP answer carried in the End of Session Transfer and the session migration complete message carries the T3 related media information, and the SRVCC IWF uses the H.248 message to carry the SDP carried in the session migration completion message.
  • the notification is notified to the MGW controlled by the SRVCC IWF, and the media plane negotiation from the media anchor to the MGW is completed.
  • the media plane path of the MGW RNS or BSS controlled by the MGW MSC controlled by the second UE media anchor SRVCC IWF is established, and the subsequent media anchor simultaneously transmits the downlink media stream from the second UE to the E-UTRAN and the RNS, Or E-UTRAN and BSS.
  • the SCC AS sends a subscription message SUBSCRIBE to the SRVCC IWF, requesting to subscribe to the Inter-RAT handover completion event, that is, requesting the SRVCC IWF to indicate whether the Inter-RAT handover has been completed.
  • the event package is defined as follows:
  • Event package name srvcc-status
  • the SRVCC IWF should be placed on the physical entity with the MGCF, avoiding the situation where the MGCF is located between the SRVCC IWF and the SCC AS and the SUBSCRIBE cannot be forwarded by the MGCF to the SRVCC IWF. occur.
  • the SRVCC IWF sends a 200 OK to the SCC AS as a response.
  • the voice call of the first UE is switched from the E-UTRAN to the CS domain of the UTRAN/GERAN, that is, an Inter-RAT handover procedure.
  • the RNS or the BSS sends a handover complete message (HO Complete) to the MSC to notify the MSC that the Inter-RAT Handover of the first UE is completed.
  • HO Complete handover complete message
  • the MSC sends a send end signal (SES) to the SRVCC IWF to notify the MSC that the Inter-RAT Handover of the first UE is completed.
  • SES send end signal
  • the SRVCC IWF sends a Forward Reloc Complete/ACK message to the MME.
  • the SRVCC IWF After receiving the end signal, the SRVCC IWF sends a notification message (Notify) to the SCC AS, notifying the SCC AS that the Inter-RAT Handover of the first UE is completed, and the SCC AS sends the SRVCC to the SRVCC. Send 200 OK as a response.
  • a notification message (Notify)
  • the SCC AS After receiving the end signal, the SRVCC IWF sends a notification message (Notify) to the SCC AS, notifying the SCC AS that the Inter-RAT Handover of the first UE is completed, and the SCC AS sends the SRVCC to the SRVCC.
  • Send 200 OK as a response.
  • the SCC AS After receiving the notification message (Notify), the SCC AS sends a relNVITE message to the second UE to request to update the media information of the session.
  • the relNVITE message is a request message for updating the media information, and the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF receives the relNVITE message, and finds that the SDP of the first UE in the source-side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used to control the media anchor to delete the T1 port. At the same time, the transmission direction of the media stream between T2 and ⁇ 3 is changed to two-way transmission. After receiving the H.248 SUB message, the media anchor deletes the information of the T1 port in the call context of the first UE and the second UE, and sets the transmission direction of the media stream between T2 and ⁇ 3 to bidirectional transmission.
  • the media anchor in the IMS network in the second embodiment of the present invention sends the downlink media stream of the second UE to the source side IP access network including the E-TURAN simultaneously and the target side circuit in the SRVCC handover process of the first UE.
  • the incoming network (including the CS domain of the UTRAN/GERAN) ensures that the first UE can immediately receive the downlink media stream of the second UE when it switches to the target side circuit access network, thereby eliminating the media plane interruption caused by the IMS Session transfer, thereby enabling
  • the interrupt delay of the SRVCC switch does not include the interrupt delay caused by the IMS Session transfer, which improves the user experience.
  • Another embodiment of the present invention provides a method for switching a voice over a radio access technology.
  • the method is different from the second embodiment in that: the second UE is located in the CS domain, and in step 315, is the MGCF serving the second UE.
  • Other steps are similar to the second embodiment and will not be described again.
  • Another embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the method is different from the foregoing second embodiment in that: the second UE is located in a different IMS domain from the first UE, and in step 315, The IBCF serving the second UE receives the relNVITE message and sends the H.248 to the media anchor.
  • ADD message in step 316, the IBCF sends a 200 OK to the SCC AS as a response, and the 200 OK carries the SDP answer; in step 326, the RBCF receives the relNVITE message, and finds that the SDP of the first UE on the source side IP access network has been deleted.
  • Sending an H.248SUB message to the media anchor the message is used to control the media anchor to delete T1, and the transmission direction between T2 and ⁇ 3 is changed to the joyful transmission.
  • the other steps are similar to the second embodiment and will not be described again.
  • Another embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the method is different from the second embodiment in that: the SRVCC IWF and the MSC are located on the same physical entity, that is, the function enhanced MSC performs the SRVCC IWF.
  • the media stream transmission direction between the media anchor point and the target side circuit access network in the handover process is one-way transmission, and when the first UE completes the inter-RAT Handover, the SCC AS needs to control the media anchor point to The media stream transmission direction with the target side circuit access network is changed to bidirectional transmission.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • a third embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the method is different from the second embodiment in that: a media anchor sets a media stream between T2 and ⁇ 3 when a T3 port is allocated.
  • the transmission direction is bidirectional transmission, and the method includes:
  • 401-414 is similar to 301-314 and will not be mentioned here.
  • the P-CSCF serving the second UE After receiving the relNVITE message sent by the SCC AS, the P-CSCF serving the second UE determines, according to the STN-SR, that the relNVITE message is a media plane update request of the SRVCC handover, and sends an H.248 ADD message to the media anchor.
  • the message is used to control the media anchor to allocate resources for the SRVCC handover request, and the remote descriptor of the T3 port allocated by the specified media anchor is the SRVCC IWF/MGW SDP.
  • the media anchor adds the remote descriptor of the T3 to the call context of the first UE and the second UE, and sets the topology relationship of T1 and ⁇ 2 to ⁇ Tl, ⁇ 2, and isolation ⁇ , that is, the T1 and ⁇ 2 are not connected.
  • Set the topological relationship of ⁇ 2 and ⁇ 3 to ⁇ 2, ⁇ 3, bidirectional ⁇ , that is, set ⁇ 2, ⁇ 3 connections, and the transmission direction of media streams between ⁇ 2 and ⁇ 3 is bidirectional.
  • the P-CSCF serving the second UE sends a 200 OK to the SCC AS as the response, and the SDP answer carried in the 200 OK is the related media information of the T3.
  • the SCC AS sends a session migration complete message to the SRVCC IWF.
  • the SDP answer carried in the End of Session Transfer l session carries the T3 related media information.
  • the SRVCC IWF notifies the MGW of the SDP answer carried in the session migration completion message to the MGW through the H.248 message, and completes the media plane negotiation from the media anchor to the MGW.
  • the second UE goes to the MGW controlled by the SRVCC IWF, the MGW controlled by the SRVCC IWF to the MGW controlled by the MSC, the media plane path of the MGW controlled by the MSC to the RNS or the BSS, and the subsequent media anchor points the downlink media from the second UE.
  • the stream is simultaneously transmitted to the E-UTRAN and the RNS, or the E-UTRAN and the BSS, and the uplink media stream from the first UE is transmitted to the second UE.
  • 418-424 is similar to 318-324 in the second embodiment, and will not be mentioned here.
  • the SCC AS After receiving the notification message (Notify), the SCC AS sends a relNVITE message to the second UE to request to update the media information of the session.
  • the relNVITE message is a second update media information request message, and the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF serving the second UE receives the relNVITE message, and finds that the SDP of the first UE in the source-side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used for control.
  • the media anchor deletes the T1 port.
  • the medium anchor point in the third embodiment of the present invention sends the downlink media stream of the second UE to the source side IP access network (including the E-TURAN) and the target side circuit access network simultaneously in the SRVCC handover process of the first UE (
  • the CS domain including the UTRAN/GERAN ensures that the first UE can immediately receive the downlink media stream of the second UE when the target side circuit is connected to the network, and the media plane interruption caused by the IMS Session transfer is eliminated, thereby interrupting the SRVCC handover.
  • the delay does not include the IMS Session transfer to cause the interrupt delay to improve the user experience.
  • the transmission direction of the media stream between T2 and T3 is set to be bidirectional, and the first UE does not need to switch to the target side circuit.
  • the transmission direction of the media stream between T2 and T3 is modified, so that the SRVCC handover delay is only the delay of the Inter-RAT Handover, which improves the user experience.
  • Embodiment 4 is applicable not only to the second UE being in the same IMS domain as the first UE, but also applicable to the first UE being in the IMS domain, the second UE being in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • Embodiment 4 is applicable not only to the second UE being in the same IMS domain as the first UE, but also applicable to the first UE being in the IMS domain, the second UE being in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • a fourth embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the method is different from the second embodiment in that: a P-CSCF receiving a policy and a charging rule function entity served by a first UE After the message indicating that the voice bearer of the first UE is unavailable in the source IP access network is sent, the message sent to the SCC AS is sent to the SCC AS to release the session of the first UE in the IMS network before the handover.
  • the method includes:
  • 501-523 is similar to 301-323 in the second embodiment, and details are not described herein again.
  • the MME After receiving the Forward Reloc Complete message sent by the SRVCC IWF, the MME sends a Request Bearer Deactivation to the S-GW, and the S-GW sends the deactivated voice to the P-GW. Request Bearer Deactivation.
  • the P-GW sends a Credit Control Request (CCR) to the PCRF to indicate that the voice bearer of the first UE in the source side IP access network is unavailable, and the PCRF sends a credit control response to the P-GW (Credit Control Answer) , CCA).
  • CCR Credit Control Request
  • CCA Credit Control Answer
  • the PCRF sends an Abort Session Request (ASR) to the P-CSCF serving the first UE, to indicate that the voice bearer of the first UE in the source-side IP access network is unavailable, and serves the first UE.
  • ASR Abort Session Request
  • the P-CSCF sends a Abort Session Request (ASA) to the PCRF.
  • ASA Abort Session Request
  • the SCC AS After receiving the BYE, the SCC AS sends a relNVITE message to the second UE, requesting to update the media information of the session, where the relNVITE message is a request message for the second update media information, where the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF serving the second UE receives the foregoing relNVITE message, and finds that the SDP of the first UE in the source side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used to control the media.
  • the anchor deletes the T1 port and simultaneously transmits the data stream between the T2 and ⁇ 3 ports. Change to two-way transmission.
  • the medium anchor point in the fourth embodiment of the present invention sends the downlink media stream of the second UE to the source side IP access network (including the E-UTRAN) and the target side circuit access network simultaneously in the SRVCC handover process of the first UE (
  • the CS domain including the UTRAN/GERAN ensures that the first UE can immediately receive the downlink media stream of the second UE when the target side circuit is connected to the network, and the media plane interruption caused by the IMS Session transfer is eliminated, thereby interrupting the SRVCC handover.
  • the delay does not include the IMS Session transfer causing the interrupt delay to improve the user experience.
  • Embodiment 4 is applicable not only to the second UE being in the same IMS domain as the first UE, but also that the first UE is in the IMS domain, the second UE is in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • Embodiment 5 is a diagrammatic representation of Embodiment 5:
  • a fifth embodiment of the present invention provides a voice switching method for a cross-radio access technology.
  • the first UE is to perform SRVCC handover, and the first UE and the second UE are located in the same IMS domain, and the first UE is in the universal terrestrial radio.
  • the access method in the access network (Universal Terrestrial Radio Access Network, UTRAN) is changed from high speed packet access (HSPA, High Speed Packet Access) to circuit access.
  • the method includes:
  • the S-CSCF serving the first UE triggers the call to the SCC AS according to the Initial Filter Criteria (iFC) of the first UE, and serves the first UE during the call setup phase.
  • the S-CSCF routes the call to the I-CSCF, the S-CSCF and the P-CSCF serving the second UE, and the P-CSCF serving the second UE sends an H.248 ADD message to the media anchor, the message carrying The indication information of the port T1 and the port T2 is added, and the remote descriptor of T1 (the SDP of the first UE in the source IP access network) and the remote descriptor of the T2 (the SDP of the second UE).
  • T1 the SDP of the first UE in the source IP access network
  • the remote descriptor of the T2 the SDP of the second UE.
  • the media anchor is a call setup context of the first UE to the second UE, that is, a call context of the first UE and the second UE, and the remote descriptor of T1 and the remote descriptor of T2 are added to the first UE and the second In the call context of the UE, the transmission direction of the media stream between T1 and T2 is set to be bidirectional.
  • the first UE sends a measurement report to the UTRAN.
  • the UTRAN determines to switch the first UE to the CS domain according to the measurement report, and sends a handover request to the Serving GPRS Support Node (SGSN). Required ).
  • SGSN Serving GPRS Support Node
  • the SGSN performs Bearer Splitting, and sends a Forward Reloc Req to the SRVCC IWF.
  • the SRVCC IWF sends a Prepare HO Req to the MSC to request the MSC to prepare for the handover of the call of the first UE to the CS domain.
  • the MSC sends a handover request (Handover Req) to the RNS or the BSS, to request the RNS or the BSS to prepare for the handover of the call of the first UE to the CS domain, and the MSC receives the handover response (Handover Ack) sent by the RNS or the BSS, where Take RNS as an example.
  • Handover Req a handover request
  • Handover Ack the handover response
  • the MSC sends a Prepare Handover Resp message to the SRVCC IWF.
  • a bearer is established between the SRVCC IWF and the MSC.
  • the SRVCC UE initiates a session transfer request message to the SCC AS.
  • the SCC AS returns an acknowledgement message to the SRVCC IWF for the session transfer request.
  • the SRVCC IWF sends a Forward Relocation Resp message to the SGSN to start an Inter-RAT Handover process of the first UE.
  • #zhang can avoid media plane switching caused by session transfer due to premature activation of Inter-RAT Handover after Inter-RAT Handover.
  • the SGSN sends a handover command to the UTRAN.
  • the UTRAN sends a handover command to the first UE, to indicate that the first UE changes from the high-speed packet access mode of the UTRAN to the wireless-intrusion mode.
  • the SCC AS sends a relNVITE message to the second UE to request to update the media information of the session, where the relNVITE message is the first request message for updating the media call information, where the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • SDP Offer SDP of the first UE in the source IP access network, SDP of the SRVCC IWF/MGW.
  • the STN-SR is the handover number of the SRVCC
  • the SRVCC IWF/MGW represents the MGW controlled by the SRVCC IWF
  • the SDP of the SRVCC IWF/MGW is the access of the first UE to the target side circuit SDP of the network
  • SDP Offer SDP of the first UE in the source side IP access network, SDP of the SRVCC IWF/MGW:
  • the descriptor of the media gateway of the call needs to be updated to the first UE in the source IP access network SDP and SRVCC IWF control the SDP of the MGW.
  • the P-CSCF serving the second UE After receiving the relNVITE message sent by the SCC AS, the P-CSCF serving the second UE determines, according to the STN-SR, that the relNVITE message is a media plane update request of the SRVCC handover, and sends an H.248 ADD message to the media anchor.
  • the message is used to control the media anchor to allocate resources for the SRVCC handover request, and the remote descriptor of the T3 port allocated by the specified media anchor is the SDP of the SRVCC IWF/MGW.
  • the media anchor adds the remote descriptor of the T3 to the call context of the first UE and the second UE, and sets the topology relationship of T1 and ⁇ 2 to ⁇ Tl, ⁇ 2, and isolation ⁇ , that is, the T1 and ⁇ 2 are not connected.
  • the P-CSCF serving the second UE sends a 200 OK as a response to the SCC AS, and the 200 OK carries the SDP answer, and the SDP answer is the related media information of the T3, which includes: ⁇ 3 remote descriptor (SRVCC IWF/MGW SDP) ).
  • the SCC AS sends a session migration complete message (End of Session Transfer) to the SRVCC IWF.
  • the SDP answer carried in the session migration completion message carries the T3 related media information, and the SRVCC IWF notifies the MGW of the SDP answer carried in the session migration completion message through the H.248 message, and completes the media plane negotiation from the media anchor point to the MGW.
  • the MGW ⁇ MSC controlled by the media anchor ⁇ SRVCC IWF is controlled by MGW ⁇
  • the media plane path of the RNS or BSS is established, and the subsequent media anchor simultaneously transmits the downlink media stream from the second UE to the PS domain and the CS domain of the UTRAN.
  • the SCC AS sends a subscription message SUBSCRIBE to the SRVCC IWF, requesting to subscribe to the Inter-RAT handover completion event, that is, requesting the SRVCC IWF to indicate whether the Inter-RAT handover has been completed.
  • the SRVCC IWF should be placed on the physical entity with the MGCF to prevent the MGCF from being located between the SRVCC IWF and the SCC AS, and the SUBSCRIBE cannot be forwarded by the MGCF to the SRVCC IWF. 619.
  • the SRVCC IWF sends a 200 OK to the SCC AS as a response.
  • the first UE is changed from high-speed packet access to electrical in UTRAN, that is, an Inter-RAT handover procedure.
  • the RNS or the BSS sends a handover complete message (HO Complete) to the MSC to notify the MSC that the Inter-RAT Handover of the first UE is completed.
  • HO Complete handover complete message
  • the SRVCC IWF sends a Forward Reloc Complete/ACK message to the SGSN.
  • the SRVCC IWF After receiving the handover complete message, the SRVCC IWF sends a notification message (Notify) to the SCC AS to notify the SCC AS that the handover is complete, and the SCC AS sends a 200 OK to the SRVCC IWF as a response.
  • a notification message (Notify)
  • the SCC AS After receiving the notification message (Notify), the SCC AS sends a relNVITE message to the second UE to request to update the media information of the session.
  • the relNVITE message is a request message of the second more media information, and the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF receives the relNVITE message, and finds that the SDP of the first UE in the source-side IP access network has been deleted, and sends an H.248SUB message to the media anchor, where the message is used to control the media anchor to delete the T1 port.
  • the transmission direction of the media streams between T2 and ⁇ 3 is changed to two-way transmission.
  • Another embodiment of the present invention provides a voice switching method for a wireless access technology, which differs from the foregoing embodiment 5 in that: the second UE is in the CS domain, and in step 615, the MGCF is served for the second UE.
  • relNVITE message sending an H.248 ADD message to the media anchor; in step 616, the MGCF sends a 200 OK to the SCC AS as a response, and the 200 OK carries the SDP answer; in step 626, the MGCF receives the relNVITE message, and finds that the first UE is in the source.
  • the SDP of the side IP access network has been deleted, and an H.248SUB message is sent to the media anchor.
  • Another embodiment of the present invention provides a voice switching method for a wireless access technology, which is different from the foregoing embodiment 5 in that: the second UE is in an IMS domain different from the first UE, and in step 615, The IBCF served by the two UEs receives the relNVITE message, and sends an H.248 ADD message to the media anchor. In step 616, the IBCF sends a 200 OK response to the SCC AS, and the 200 OK carries the SDP answer.
  • the IBCF receives the relNVITE message.
  • the SDP of the first UE in the source-side IP access network is deleted, and the H.248SUB message is sent to the media anchor, where the message is used to control the media anchor to delete T1, and the transmission direction of the T2 and ⁇ 3 media streams is changed. For two-way transmission.
  • the other steps are similar to those in the fifth embodiment, and are not described herein again.
  • Another embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the method is different from the sixth embodiment in that: the SRVCC IWF and the MSC are located on the same physical entity, that is, the function enhanced MSC performs the SRVCC IWF.
  • the medium anchor point in the fifth embodiment of the present invention simultaneously sends the downlink media stream of the second UE to the source side IP access network (including the PS domain of UTRAN/GERAN) and the target side electric wife in the process of SRVCC handover by the first UE.
  • the incoming network (including the CS domain of the UTRAN/GERAN) ensures that the first UE can immediately receive the downlink media stream of the second UE when switching to the target side circuit access network, thereby eliminating the media plane interruption caused by the IMS Session transfer, thereby
  • the SRVCC handover interruption delay does not include the IMS Session transfer to cause an interrupt delay, which improves the user experience.
  • a seventh embodiment of the present invention provides a voice switching method for a wireless access technology, where the first UE is located in the UTRAN, and the method is different from the implementation sixth in that: the media anchor is allocated T3.
  • the transmission relationship between the media streams of T2 and ⁇ 3 is two-way transmission, and the method includes:
  • 701-714 is similar to 601-614, and will not be described here.
  • the P-CSCF serving the second UE After receiving the relNVITE message sent by the SCC AS, the P-CSCF serving the second UE determines, according to the STN-SR, that the relNVITE message is a media plane update request of the SRVCC handover, and sends an H.248 ADD message to the media anchor.
  • the message is used to control the media anchor to allocate resources for the SRVCC handover request, and the remote descriptor of the T3 port allocated by the specified media anchor is the SRVCC IWF/MGW SDP.
  • the media anchor adds the remote descriptor of T3 to the first UE and the second UE.
  • the P-CSCF serving the second UE sends a 200 OK message to the SCC AS in response, the 200 OK carries the SDP answer, and the SDP answer is the related media information of the T3, which includes: the remote descriptor of the T3 (SRVCC IWF/MGW SDP).
  • the SCC AS sends a session migration completion message to the SRVCC IWF.
  • the SDP answer carried in the End of Session Transfer ⁇ session migration complete message carries the T3 related media information, and the SRVCC IWF passes the SDP carried in the session migration completion message by using the H.248 message. Answer the notification to the MGW to complete the media face negotiation from the media anchor to the MGW.
  • the second UE-SRVCC IWF controlled MGW-MSC controlled MGW-RNS or BSS media plane path is established, and the subsequent media anchor simultaneously transmits the downlink media stream from the second UE to the PS domain and the CS domain of the UTRAN. And sending the uplink media stream from the first UE to the second UE.
  • 718-724 are similar to 618-624 in the sixth embodiment, and are not described herein again.
  • the SCC AS After receiving the notification message (Notify), the SCC AS sends a relNVITE message to the second UE, requesting to update the media information of the session.
  • the relNVITE message is a second update media information request message, and the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF serving the second UE receives the foregoing relNVITE message, and finds that the SDP of the first UE in the source side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used to control the media.
  • the anchor deletes the T1 port.
  • Embodiment 6 is applicable not only to the second UE being in the same IMS domain as the first UE, but also applicable to the first UE being in the IMS domain, the second UE being in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • the medium anchor point in the sixth embodiment of the present invention simultaneously sends the downlink media stream of the second UE to the source side IP access network (including the UTRAN/GERAN PS) during the SRVCC handover process by the first UE.
  • the domain and the target side are connected to the network (including the CS domain of the UTRAN/GERAN) to ensure that the first UE can immediately receive the downlink media stream of the second UE when switching to the target side circuit access network, thereby eliminating the IMS Session transfer.
  • the media plane is interrupted, so that the SRVCC handover interruption delay does not include the IMS Session transfer causing the interrupt delay to improve the user experience; and when the T3 port is allocated, the transmission direction of the media stream between T2 and T3 is set to be bidirectional transmission, and is not required.
  • the transmission direction of the media stream between T2 and T3 is modified, so that the SRVCC handover delay is only the delay of the Inter-RAT Handover, thereby improving the user experience.
  • a seventh embodiment of the present invention provides a voice switching method for a wireless access technology, where the first UE is located in the UTRAN, and the method is different from the fifth embodiment in that: the PCRF serves the first UE.
  • the P-CSCF sends a message indicating that the voice bearer of the first UE in the source side IP access network is unavailable, and the P-CSCF serving the first UE sends a message to the SCC AS indicating that the first UE is in the IMS network before the switchover Session message, the method includes:
  • 801-823 is similar to 601-623 in the fifth embodiment, and details are not described herein again.
  • the SGSN receives a forward location complete message sent by the SRVCC IWF (Forward Reloc)
  • the GGSN sends a Delete PDP Context Response to the SGSN.
  • the GGSN sends a Credit Control Request (CCR) to the PCRF to indicate that the voice bearer of the first UE in the source side IP access network is unavailable, and the PCRF sends a Credit Control Answer (CCA) to the GGSN. .
  • CCR Credit Control Request
  • CCA Credit Control Answer
  • the PCRF sends an Abort Session Request (ASR) to the P-CSCF serving the first UE, to indicate that the voice bearer of the first UE in the source-side IP access network is unavailable, and serves the first UE.
  • ASR Abort Session Request
  • the P-CSCF sends a Abort Session Request (ASA) to the PCRF.
  • ASA Abort Session Request
  • the SCC AS After receiving the BYE, the SCC AS sends a re!NVITE message to the second UE, requesting an update meeting.
  • the media information of the voice wherein the relNVITE message is a second update media information request message, and the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF serving the second UE receives the relNVITE message, and finds that the SDP of the first UE in the source-side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used to control the media.
  • the anchor deletes the T1 port and changes the transmission direction of the media stream between T2 and T3 to bidirectional transmission.
  • the media anchor in the seventh embodiment of the present invention simultaneously sends the downlink media stream of the second UE to the source side IP access network (including the PS domain of UTRAN/GERAN) and the target side electric wife in the process of SRVCC handover by the first UE.
  • the incoming network (including the CS domain of the UTRAN/GERAN) ensures that the first UE can immediately receive the downlink media stream of the second UE when switching to the target side circuit access network, thereby eliminating the media plane interruption caused by the IMS Session transfer, thereby
  • the SRVCC handover interruption delay does not include the IMS Session transfer to cause an interrupt delay, which improves the user experience.
  • the technical solution provided in the foregoing seventh embodiment is applicable not only to the second UE being in the same IMS domain as the first UE, but also that the first UE is in the IMS domain, the second UE is in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • the SCC AS learns whether the first UE has completed the Inter-RAT Handover by subscribing to the SRVCC IWF for the handover event of the first UE, and when the Inter-RAT Handover is completed, the SCC The AS changes the transmission direction of the media stream between T2 and ⁇ 3 on the media anchor to two-way transmission. Therefore, the SRVCC IWF and the MGCF are required to be on the same physical entity and support the SIP protocol, so that the MGCF is located between the SRVCC IWF and the SCC AS, and the related information cannot be forwarded to the SCC AS by the MGCF. If the SRVCC IWF and the MGCF are respectively deployed on different physical entities, the present invention can be implemented by the following technical solutions provided in Embodiment 8 and Embodiment 9.
  • the eighth embodiment of the present invention provides a voice switching method for a wireless access technology.
  • the first UE is to perform SRVCC handover, and the first UE and the second UE are located in the same IMS domain.
  • the first UE is located in the E-UTRAN, and the method specifically includes:
  • 901-922 is similar to 301-322 in the second embodiment, and details are not described herein again.
  • the SRVCC IWF sends an Unstructured Supplementary Service Data (USSD) message to the Home Subscriber Server (HSS), where the message carries the mobile subscriber international number of the user that the Inter-RAT Handover has completed ( The Mobile Station ISDN number, MSISDN) logo.
  • USSD Unstructured Supplementary Service Data
  • HSS Home Subscriber Server
  • the HSS sends a notification message (Sh-Notify) to the SCC AS through the Sh interface, where the message carries the MSISDN identifier of the user who has completed the Inter-RAT Handover.
  • the SCC AS determines, according to the MSISDN identifier carried in the notification message, that the first UE has completed the Inter-RAT Handover, and sends a relNVITE message to the second UE, requesting to update the media information of the session, where the relNVITE message is the second update media information.
  • Request message, the relNVITE message includes:
  • Request-URI STN-SR (SRVCC switch number)
  • the P-CSCF serving the second UE receives the foregoing relNVITE message, and finds that the SDP of the first UE in the source side IP access network has been deleted, and sends an H.248SUB message to the media anchor, where the message is used to control the media.
  • the anchor deletes the T1 port and changes the transmission direction of the T2 and ⁇ 3 media streams to two-way transmission.
  • the SRVCC IWF sends a Forward Relocation Complete (ACK) message to the MME.
  • ACK Forward Relocation Complete
  • the technical solution provided in the foregoing embodiment 8 is applicable not only to the second UE being in the same IMS domain as the first UE, but also applicable to the first UE being in the IMS domain, the second UE being in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • the medium anchor point in the eighth embodiment of the present invention sends the downlink media stream of the second UE to the source side IP access network (including the E-UT AN) and the target side circuit access network simultaneously in the SRVCC handover process of the first UE. (including the CS domain of the UTRAN/GERAN), ensuring that the first UE can immediately receive the downlink media stream of the second UE when switching to the target side circuit access network, thereby eliminating the media plane interruption caused by the IMS Session transfer, thereby enabling the SRVCC to switch. Interrupt delay does not include IMS Session transfer Causes interrupt latency and improves user experience.
  • a ninth embodiment of the present invention provides a voice switching method for a wireless access technology, where the first UE will access in a Universal Terrestrial Radio Access Network (UTRAN). From high speed packet access (HSPA, High Speed Packet Access) to circuit access, the method specifically includes:
  • 1001—1022 is similar to 601—622, and will not be described here.
  • the SRVCC IWF sends an Unstructured Supplementary Service Data (USSD) message to the HSS, where the message carries the MSISDN identifier of the user that the Inter-RAT Handover has completed.
  • USSD Unstructured Supplementary Service Data
  • the HSS sends a notification message (Sh-Notify) to the SCC AS through the Sh interface, where the message carries the MSISDN identifier of the user who has completed the Inter-RAT Handover.
  • Sh-Notify a notification message
  • the SCC AS determines, according to the MSISDN identifier carried in the notification message, that the first UE has completed the Inter-RAT Handover, and sends a relNVITE message to the second UE, requesting to update the media information of the session, where the relNVITE message is the second update media information.
  • Request message, the relNVITE message includes:
  • the P-CSCF serving the second UE receives the foregoing relNVITE message, and finds that the SDP of the first UE in the source side IP access network has been deleted, and sends an H.248 SUB message to the media anchor, where the message is used to control the media.
  • the anchor deletes the T1 port and changes the transmission direction of the T2 and ⁇ 3 media streams to two-way transmission.
  • the SRVCC IWF sends a Forward Relocation Complete (ACK) message to the SGSN.
  • ACK Forward Relocation Complete
  • the technical solution provided in the foregoing embodiment 8 is applicable not only to the second UE being in the same IMS domain as the first UE, but also applicable to the first UE being in the IMS domain, the second UE being in the CS domain, or the first UE and The second UE is in a different IMS domain and does not affect the implementation of the present invention.
  • the media anchor point in the ninth embodiment of the present invention will be the second in the process of performing SRVCC handover by the first UE.
  • the downlink media stream of the UE is simultaneously sent to the source side IP access network (including the PS domain of the UTRAN/GERAN) and the target side to the mobile network (including the CS domain of the UTRAN/GERAN) to ensure that the first UE switches to the target side circuit.
  • the downlink media stream of the second UE can be immediately received, and the media plane interruption caused by the IMS Session transfer is eliminated, so that the SRVCC handover interruption delay does not include the IMS Session transfer causing the interrupt delay, thereby improving the user experience.
  • the SCC AS sends a relNVITE message to the media anchor control network element (P-CSCF/MGCF/IBCF) to control the media anchor to modify the topology of the port, and the Request-URI in the relNVITE message.
  • the STN-SR (Handover Number) is carried. If the control network element (P-CSCF/MGCF/IBCF) of the media anchor does not support the solution of the present invention, the relNVITE message cannot continue to be routed, causing the IMS session transfer to fail. .
  • the SCC AS can detect whether the P-CSCF/MGCF/IBCF supports the SRVCC performance optimization function during the call setup phase.
  • the SRVCC performance optimization function means that the P-CSCF/MGCF/IBCF can recognize the STN-SR (handover number) and notify the media anchor to establish or modify the topology relationship.
  • the SCC AS After the session between the first UE and the second UE is established, the SCC AS sends a SIP Option message (SIP Option) message to query whether the control network element (P-CSCF/MGCF/IBCF) of the media anchor supports SRVCC. Performance optimization.
  • SIP Option SIP Option message
  • the control network element (P-CSCF/MGCF/IBCF) of the media anchor returns a 200 OK message as a response, and the message carries indication information indicating whether the SRVCC performance optimization is supported.
  • a tenth embodiment of the present invention provides a media anchor point, where the media anchor point may be an MGW or an SBC, and the media anchor point includes:
  • the message receiving unit 1201 is configured to receive a message indicating that the port is added, where the message indicating the added port is used to indicate that the media anchor increases a port that communicates with the target side circuit access network, and receives a message indicating that the first port is unavailable. ;
  • the port allocating unit 1202 is configured to allocate a third port as a port for communicating with the target side circuit access network according to the message indicating that the port is added according to the indication;
  • the media stream receiving unit 1203 is configured to receive the downlink media stream from the second UE by using the second port, where the first media stream sending unit 1204 is configured to send the downlink media stream to the source IP access network by using the first port. ;
  • the second media stream sending unit 1205 is configured to send the downlink media stream to the target side electrical access network through the third port;
  • the control unit 1206 is configured to: after receiving the message indicating that the first port is unavailable, control not to send the downlink media stream from the second UE to the source side IP access network.
  • the message indicating that the port is added carries the session description protocol SDP of the first UE in the target side circuit access network; the port allocating unit 1202 is configured to add the first in the call context of the first UE and the second UE.
  • the first UE of the third port remote descriptor accesses the SDP information of the network in the target side circuit; and sets the transmission direction of the media stream between the second port and the third port to be bidirectional in the call context of the first UE and the second UE transmission.
  • the media anchor also includes:
  • a context information establishing unit configured to establish a call context of the first UE and the second UE in a call setup phase, and add information of the first port and information of the second port in a call context of the first UE and the second UE And setting the media stream transmission direction between the first port and the second port to be bidirectional, where the information of the first port includes the SDP of the first UE that is the remote identifier of the first port on the source side IP access network, The information of the second port includes an SDP of the second UE as the remote descriptor of the second port;
  • a context information modification unit configured to set, in a call context of the first UE and the second UE, a transmission direction of the media stream between the second port and the third port from a second port to a third port to a bidirectional direction Transmission.
  • the first media stream sending unit 1204 is configured according to the transmission direction of the media stream between the first port and the second port set in the call context of the first UE and the second UE, and the first UE is in the source side IP access network.
  • the SDP sends the downlink media stream to the source IP access network through the first port.
  • the message indicating that the first port is unavailable is a message indicating that the first port is deleted; the control unit 1206 is configured to delete the information of the first port from the call context of the first UE and the second UE.
  • the media anchor sends the downlink media stream from the second UE to the source IP access network and the target side to the network in the process of the SRVCC handover in the first UE, ensuring that the first UE switches to the network.
  • the target side circuit accesses the network, the downlink media stream of the second UE can be immediately received, and the media plane interruption caused by the IMS Session transfer is eliminated, so that the SRVCC handover interruption delay does not include the interruption delay caused by the IMS Session transfer, and the user is improved.
  • Example 11 Example 11:
  • the eleventh embodiment of the present invention provides a network system, including: a media anchor control network element, a media anchor point, and an SCC AS, where
  • the SCC AS is configured to send, when the first UE performs the SRVCC handover, a request message that carries the first update session media information of the SDP of the first UE in the target side circuit access network, where the first UE has switched to the target side. After the circuit accesses the network, sending, to the media anchor control network element, a request message that does not carry the second update session media information of the SDP of the first UE in the source side IP access network;
  • the media anchor control network element is configured to receive a request message for the first update media information, and extract, from the request message of the first update media information, the SDP of the first UE in the target side circuit access network to join the indication increase port.
  • the message indicating the addition of the port is sent to the media anchor; after receiving the request message of the second update media information, the request message for determining the second update media information does not carry the first UE on the source side IP access network.
  • SDP sends a message indicating that the first port is unavailable to the media anchor;
  • the media anchor is configured to receive a message indicating that the port is added, add a third port as a port for communicating with the target side circuit access network according to the indication, and receive a downlink from the second UE by using the second port.
  • the media stream is sent to the source side IP access network through the first port, and is sent to the target side circuit access network through the third port; after receiving the message indicating that the first port is unavailable, the control is performed.
  • the downlink media stream from the second UE is not transmitted to the source side IP access network.
  • the media anchor sends the downlink media stream from the second UE to the source IP access network simultaneously under the control of the media anchor control network element.
  • the target side circuit accesses the network, and ensures that the first UE can immediately receive the downlink media stream of the second UE when the first-party UE is switched to the network, and the media delay caused by the IMS Session transfer is eliminated, thereby improving the user experience. It can be accomplished by a program to instruct related hardware, and the program can be stored in a computer readable storage medium such as a read only memory, a magnetic disk or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Les modes de réalisation de la présente invention portent sur un procédé, un équipement et un système de réseau pour le transfert en mode voix inter-technologie d'accès radio, le procédé de transfert en mode voix inter-technologie d'accès radio comprenant les opérations suivantes : une ancre multimédia dans un sous-système multimédia par protocole Internet (IMS) reçoit un message qui indique l'ajout d'un port, et le message qui indique l'ajout d'un port est utilisé pour indiquer à l'ancre multimédia d'ajouter le port pour communiquer avec un réseau d'accès circuit côté cible; conformément au message qui indique l'ajout d'un port, un troisième port est attribué en tant que port pour communiquer avec le réseau d'accès circuit côté cible; un flux multimédia de liaison descendante provenant d'un second équipement utilisateur (UE) est reçu par l'intermédiaire d'un deuxième port, et le flux multimédia de liaison descendante est envoyé à un réseau d'accès par protocole Internet (IP) côté source par l'intermédiaire d'un premier port et envoyé au réseau d'accès circuit côté cible par l'intermédiaire du troisième port; l'ancre multimédia reçoit un message indiquant l'indisponibilité du premier port, et met en œuvre la commande pour ne pas envoyer le flux multimédia de liaison descendante du second UE au réseau d'accès IP côté source. Par utilisation des solutions décrites par les modes de réalisation de la présente invention, le temps d'interruption de session provoqué par un transfert peut être réduit et l'expérience des utilisateurs peut être améliorée.
PCT/CN2010/076601 2009-09-04 2010-09-03 Procédé, équipement et système de réseau pour transfert en mode voix inter-technologie d'accès radio WO2011026438A1 (fr)

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