WO2009100609A1 - 一种单无线信道语音业务连续性的域切换方法 - Google Patents

一种单无线信道语音业务连续性的域切换方法 Download PDF

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Publication number
WO2009100609A1
WO2009100609A1 PCT/CN2008/002157 CN2008002157W WO2009100609A1 WO 2009100609 A1 WO2009100609 A1 WO 2009100609A1 CN 2008002157 W CN2008002157 W CN 2008002157W WO 2009100609 A1 WO2009100609 A1 WO 2009100609A1
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WIPO (PCT)
Prior art keywords
message
session
vcc
handover
lte
Prior art date
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PCT/CN2008/002157
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English (en)
French (fr)
Inventor
Shilin You
Jiyan Cai
Zhenwu Hao
Zhiming Yu
Original Assignee
Zte Corporation
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to EP08872379.6A priority Critical patent/EP2229036A4/en
Priority to US12/866,202 priority patent/US8180347B2/en
Priority to EP17174710.8A priority patent/EP3240257B1/en
Publication of WO2009100609A1 publication Critical patent/WO2009100609A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1096—Supplementary features, e.g. call forwarding or call holding
    • 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
    • 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]
    • 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 accessing a single wireless channel voice service continuity from a next-generation mobile communication network LTE/SAE (Long Term Evolution, System Architecture Evolution) architecture (Single Radio Voice) Call Continuity (SRVCC for short) is the domain switching method.
  • LTE/SAE Long Term Evolution, System Architecture Evolution
  • SAE Single Radio Voice Call Continuity
  • a dual-mode user equipment is registered in both the CS domain and the IMS domain.
  • the voice service continuity application server (voice call Continuity) is anchored to the IMS domain.
  • Application Server referred to as VCC AS.
  • the two-mode UEs have two numbers known to the VCC AS: VDK VCC Domain Transfer URI, VCC domain switching universal identifier), indicating that the user switches from the CS domain to the IMS domain; VDN (VCC Domain Transfer Number, VCC Domain Switch Number) , the user session is switched from the IMS domain to the CS domain at the service layer.
  • the dual-mode UE uses the VDI as the called number in the IMS domain to initiate a session request to the VCC AS, and the VCC AS receives the session request. Then, the resources of the CS domain are released, and the resources of the established session and the original session in the IMS domain are switched, and the handover is completed.
  • the modulo UE uses the VDN as the called number in the CS domain to initiate a session request to the VCC AS. After receiving the session request, the VCC AS releases the resources of the IMS domain, associates the established session with the resources of the original session in the IMS, and the handover is completed.
  • the dual-mode UE must support Dual Radio (dual mode dual standby), that is, simultaneous voice calls can be made in the IMS domain and the CS domain.
  • Dual Radio dual mode dual standby
  • ICS centralized control
  • another application server ICCF IMS CS Control Function
  • the ICCF is adjacent to the VCC AS and is located at the beginning of the call.
  • AS Application Server
  • the other CS networks only serve as a type of pipe access to the IMS domain, and all services are triggered by the ICCF of the IMS domain.
  • the mobile communication network has proposed the next-generation architecture concept of LTE/SAE, enabling the evolved wireless communication system to provide higher transmission rates. Shorter transmission delay, lower cost, support for mobility between 3GPP (3rd Generation Partnership Project) internal access systems, and 3GPP access systems and non-3GPP access systems Between mobility and so on.
  • LTE/SAE will also serve as an access method for the IMS domain and support the original VCC function.
  • the single-channel voice service continuity SRVCC is proposed.
  • the principle architecture diagrams of the two schemes for implementing SRVCC are as follows. Figure 2 and Figure 3, where:
  • the corresponding network elements of LTE/SAE mainly include:
  • E-UTRAN (Evolved UTRAN) is a next-generation radio access network that provides higher uplink and downlink rates, lower transmission delays, and more reliable wireless transmission.
  • the MME Mobility Management Entity
  • the MME is a control plane function entity that is responsible for managing and storing UE contexts (such as UE/user identity, mobility management state, user security parameters, etc.), assigning temporary identifiers to users, and when the UE is camped on The tracking area or the network is responsible for authenticating the user.
  • UE contexts such as UE/user identity, mobility management state, user security parameters, etc.
  • the SAE GW (SAE Gateway) is a user plane function entity and is responsible for user plane data routing processing. It can be divided into SGW (Serving SAE GW, Serving SAE GW) and PDN GW (Public Data Network).
  • SGW is a mobility anchor between the SAE system and the legacy 3GPP system and the mobility anchor between the E-UTRAN.
  • PDN GW terminates the downlink data of the UE in the idle state, initiates paging when the downlink data sent to the UE arrives, and manages and stores the context of the UE, such as the IP bearer service parameter and the internal routing information of the network.
  • the existing 2G (2nd Generation, 2nd Generation, 3rd Generation, 3rd Generation, 3rd Generation Mobile) mobile network mainly includes the following network elements: 2G GERAN (GSM/EDGE Radio Access Network) or 3G UTRAN (Universal Terrestrial Radio Access Network), and Core Network (CN).
  • the core network element includes the VMSC (Visit Mobile Service Switch Center) / MSC (Mobile Services Switch Center) and PS domain (Packet Switched Domain).
  • SGSN Server GPRS
  • the HSS Home Subscriber Server
  • the IMS network mainly includes the following network elements:
  • Core network elements such as CSCF (Call Session Control Function), MGCF (Media Gateway Control Function), and VCC AS that implement VCC.
  • CSCF Call Session Control Function
  • MGCF Media Gateway Control Function
  • VCC AS Vehicle Control Function
  • a single wireless channel voice service continuity control function is added, such as the S-IWF (Shared Inter Working Function) in FIG. And the IWF (Inter Working Function) in Figure 3, the core network element VMSC of the CS domain of the S-IWF/IWF and 2G/3G, and the core network element SGSN of the PS domain, and the LTE/SAE network
  • the MMEs are all connected to control the switching between the LTE/SAE network and the 2G/3G network.
  • the S-IWF/IWF is also connected to the ICCF/VCC AS through the CSCF of the IMS domain network to ensure that all calls can be anchored to the ICCF/VCC AS in the IMS domain to ensure the basic functions of the VCC.
  • the interface between the S-IWF and the VMSC uses an E interface, and the E interface uses a Mobile Application Part (MAP) signaling, and the S-IWF and the VMSC are switched.
  • the inter-office handover mode of the CS domain is used.
  • the A/Iu-CS interface is used between the IWF and the VMSC, and the intra-office handover mode of the CS domain is switched between the IWF and the VMSC.
  • the UE can access the IMS domain through the LTE/SAE, or the PS domain of the 2G/3G network (such as the CS domain access device GERAN/UTRAN in the figure) (that is, the PS domain in the figure)
  • the access device SGSN part accesses the IMS network, enjoys the IMS service, and can also access the 2G/3G CS network (ie, the VMSC/MGW in the figure) to provide CS services such as voice services.
  • 4 is a flow of implementing handover from LTE/SAE to CS domain in the SRVCC architecture shown in FIG. 2.
  • a session is initiated between the UE and the UE-B in the IMS, and is anchored to the VCC AS; Includes the following steps:
  • the UE sends a measurement report to the radio network element E-UTRAN of the LTE/SAE.
  • the E-UTRAN initiates a redirect request message to the MME according to the information in the measurement report.
  • the MME sends a forward redirect request message to the S-IWF according to the information of the redirect request message, instructing the S-IWF to switch the corresponding session to the CS domain access.
  • the S-IWF and the CS domain network element VMSC and the GERAN/UTRAN complete the handover request and handover request of the CS domain inter-office handover and the response process thereof;
  • the inter-office handover of the CS domain includes: the S-IWF sends a MAP preparation handover request message to the VMSC, the VMSC sends a handover request message to the GERAN/UTRAN, and the GERAN/UTRAN sends a handover request confirmation message to the VMSC, and the VMSC prepares a handover request to the S-IWF back to the MAP.
  • the S-IWF sends an initial address message of the ISUP (ISDN User Part) signaling to the VMSC according to the switching number, and the VMSC sends an ISUP address full message to the S-IWF.
  • ISUP ISDN User Part
  • the S-IWF sends an initial address message of the ISUP to the ICCF/VCC AS through the VMSC of the CS domain and the MGCF and the CSCF of the IMS domain, where the message carries the VDN, indicating that the session is switched from the IMS domain to the CS domain at the service layer, ICCF /VCC AS returns a response message to the S-IWF;
  • the ICCF/VCC AS initiates a release session message to the UE by using the IMS domain and the LTE/SAE network, and notifies the UE-B to update the bearer by using the IMS domain.
  • the S-IWF sends back a forward relocation request confirmation message to the MME.
  • the MME sends a relocation request confirmation message to the E-UTRAN.
  • the E-UTRAN sends a relocation command message (handover command) to the UE.
  • the UE sends a handover access message to the target GERAN/UTRAN;
  • the GERAN/UTRAN After detecting the handover, the GERAN/UTRAN sends a handover detection message to the VMSC. 113.
  • the VMSC sends a MAP processing access signaling message to the S-IWF, where the message notifies that the S-IWF user terminal has started to access from the CS domain.
  • the UE sends a handover complete message to the GERAN/UTRAN.
  • the GERAN/UTRAN sends a handover complete message to the S-IWF by the VMSC.
  • the VMSC sends a MAP transmission end signal message to the S-IWF, notifying that the S-IWF user terminal has switched to the CS domain, and the S-IWF ends according to the MAP.
  • the signal message judges that the handover is completed;
  • the VMSC sends an ISUP response message to the S-IWF (corresponding to the ISUP initial address message in step 105);
  • the S-IWF After the handover is completed, the S-IWF notifies the LTE/SAE network to release resources.
  • step 107 If the VCC AS has released the LTE/SAE resource at step 107, then the step is no longer performed.
  • FIG. 5 is a flow chart of the call from LTE/SAE to CS domain in the SRVCC architecture shown in Figure 3, which mainly includes the following steps:
  • a session is initiated between the UE and the UE-B in the IMS, and is anchored to the VCC AS.
  • the UE is attached to the CS network by using an LTE/SAE network.
  • the UE initiates a CS call through the LTE/SAE network, and completes the access process (including encryption, authorization, etc.);
  • the UE sends a call setup message (SETUP message) to the network side (IWF), where the message carries the VDN as the called number.
  • SETUP message a call setup message
  • IWF network side
  • the IWF saves the call setup information
  • the UE sends a measurement report to the LTE/SAE radio network element E-UTRAN.
  • E-UTRAN decides to switch
  • the E-UTRAN sends a handover request message to the MME according to the information in the measurement report.
  • the MME sends a handover request message to the IWF. 5110, the IWF sends a call setup message (SETUP message) to the VMSC according to the information saved in step S105, where the message carries the VDN as the called number;
  • SETUP message a call setup message
  • steps Sl l l S115 and steps S116 to S128 are performed separately:
  • the VMSC sends an initial address message of the ISUP according to the VDN in the call setup message to establish a call to the MGCF.
  • the MGCF After the MGCF receives the ISUP initial address message, the MGCF establishes a SIP (Session Initial Protocol) session to the VCC AS.
  • SIP Session Initial Protocol
  • the MGCF After the SIP session is successfully established, the MGCF sends an ISUP response message to the VMSC.
  • the VMSC sends a response message (CONNECT (Connect) message) to the UE;
  • VCC AS initiates a release session message to the UE through the IMS domain and the LTE/SAE network, and notifies the UE-B to update the bearer through the IMS domain.
  • the VMSC sends a channel assignment request message to the IWF, and the IWF returns a channel assignment response message to complete the channel assignment process.
  • the IWF sends a handover request message to the VMSC according to the information received in step S109;
  • the VMSC sends a handover request message to the target GERAN/UTRAN.
  • the target GERAN/UTRAN completes the reservation of the resource, and sends a handover response message to the VMSC;
  • the VMSC sends a handover command message to the IWF.
  • the IWF sends a handover response message to the MME.
  • the MME sends a handover command message to the E-UTRAN.
  • the E-UTRAN sends a handover command message to the UE.
  • the UE sends a handover access message to the target GERAN/UTRAN, and accesses the target GERAN/UTRAN;
  • the GERAN/UTRAN After detecting the handover, the GERAN/UTRAN sends a handover detection message to the VMSC.
  • the UE handover is completed, and the VMSC receives the handover complete message; S128.
  • the VMSC releases the resource of the handover initiation side LTE/SAE.
  • the above technology has the following problems: After the ICCF/VCC AS receives the initial address message of the ISUP (steps 106 and S111), the session established between the ICCF/VCC AS and the UE via LTE/SAE is released, and the UE may The handover command has not been received, or is being switched.
  • the session path at this time is as shown in FIG. 6. Only the CS network and the remote node are connected between the UE and the remote node, and only when the UE successfully switches to the CS. After the domain, the session between the UE and the remote node can be connected. If the UE does not successfully switch to the CS domain, the UE cannot return to the original session channel to continue the session because the session resources between the VCC AS and the LTE/SAE network have been released.
  • the technical problem to be solved by the present invention is to provide a domain switching method for single wireless channel voice service continuity, so that when the UE cannot successfully switch from the LTE/SAE network to the CS domain, the original session channel of the LTE/SAE network can be returned to continue. Conversation.
  • the present invention provides a domain switching method for single wireless channel voice service continuity.
  • the user equipment UE evolves the SAE network access through the long-term evolution LTE/system architecture, and establishes anchor-to-voice service continuity with the remote node.
  • the LTE/SAE network sends a handover command to the UE, and after receiving the handover command, the UE sends a handover complete message to the target access device of the CS domain;
  • the S-IWF After the UE sends the handover complete message, the S-IWF sends a release session notification message to the VCC AS after receiving the message indicating that the handover complete message is sent by the UE.
  • the VCC AS After receiving the release session notification message, the VCC AS releases the session resources of the VCC AS to the session of the LTE/SAE network.
  • the method further includes:
  • the S-IWF sends a voice service carrying the voice service continuity domain switching number VDN to the VCC AS.
  • a continuity switching request the VDN is used to indicate that the VCC AS performs domain switching of voice service continuity of a single wireless channel;
  • the VCC AS learns, according to the VDN, that the session resources of the VCC AS to the session of the LTE/SAE network are released after receiving the release session notification message.
  • the method further includes:
  • the S-IWF sends a handover notification message to the VCC AS to notify the VCC AS that the domain switching of the voice service continuity of the single wireless channel is about to be performed;
  • the VCC AS learns, according to the handover notification message, that the session resource of the VCC AS to the session of the LTE/SAE network needs to be released after receiving the release session notification message.
  • the handover notification message is: an unstructured supplementary service data USSD message, or an information message of an initial session protocol SIP.
  • the release session notification message is: a USSD message, or an indication message of a SIP, or an information message of a SIP, or a session request message of a SIP, or a re-session message of a SIP.
  • the VCC AS after receiving the release session notification message, the VCC AS also releases the LTE/SAE network.
  • the present invention also provides a domain switching method for single wireless channel voice service continuity.
  • the UE establishes an IMS session anchored to the VCC AS with the remote node through the LTE/SAE network access; when the interworking function IWF receives the UE to send After the call setup message carrying the VDN and the handover request sent by the LTE/SAE network for switching the session to access from the CS domain, the LTE/SAE network and the CS domain network are controlled to perform subsequent handover operations, and the method includes :
  • the UE After receiving the handover complete message sent by the LTE/SAE network, the UE sends a handover access message and a handover complete message to the target access device in the CS domain, and sends a notification message that the handover has been completed to the VCC AS.
  • the VCC AS After receiving the notification message of the completed handover, the VCC AS releases the session resources of the VCC AS to the session of the LTE/SAE network.
  • the VDN is used to indicate that the VCC AS performs domain switching of voice service continuity of a single wireless channel;
  • the IWF Before receiving the handover request sent by the LTE/SAE network, the IWF, before releasing the session resources of the session of the VCC AS to the LTE/SAE network, includes:
  • the IWF sends a call setup message containing the VDN to the VMSC; after receiving the call setup message, the VMSC sends an ISUP initial address message containing the VDN to the media gateway control function MGCF;
  • the MGCF After receiving the ISUP initial address message, the MGCF establishes a SIP session with the VCC AS by using the VDN;
  • the VCC AS learns, according to the VDN, that the session resource of the VCC AS to the session of the LTE/SAE network is released after receiving the notification message of the completed handover.
  • the VCC AS After receiving the notification message of the completed handover, the VCC AS also updates the remote bearer of the session.
  • the notification message that the handover has been completed is: a USSD message, or a SIP message.
  • the present invention provides a method for implementing continuity of a single radio channel voice service in an LTE/SAE and 2G/3G network architecture, and solves the problem that the handover is unsuccessful when switching from LTE/SAE to the CS domain in the prior art. You cannot return to the original session channel to continue the call.
  • Figure 1 is a schematic diagram of a conventional VCC solution
  • FIG. 2 is a schematic diagram of an SRVCC architecture based on an LTE/SAE network
  • FIG. 3 is another SRVCC architecture diagram based on an LTE/SAE network
  • FIG. 4 is a flow chart of implementing LTE/SAE handover to a CS domain based on the SRVCC of FIG. 2 in the prior art;
  • FIG. 5 is a flowchart of implementing LTE/SAE to CS domain handover based on the SRVCC of FIG. 3 in the prior art
  • 6 is a schematic diagram of an unsuccessful handover from LTE/SAE to a CS domain in the existing SRVCC architecture
  • FIG. 7 is a flowchart of implementing LTE/SAE to CS domain handover based on the SRVCC of FIG. 2 according to an embodiment of the present invention
  • FIG. 8 is a flowchart of implementing LTE/SAE to CS domain switching based on SRVCC of FIG. 2 according to another embodiment of the present invention.
  • FIG. 9 is a flowchart of implementing LTE/SAE handover to a CS domain based on the SRVCC of FIG. 3 according to an embodiment of the present invention. Preferred embodiment of the invention
  • FIG. 7 is an embodiment of implementing LTE/SAE to CS domain handover according to the SRVCC architecture of FIG. 2, where a UE initiates a session in an IMS domain through an LTE/SAE network, and anchors an IMS domain in a VCC AS.
  • the handover method of the embodiment includes the following steps:
  • the UE sends a measurement report to the LTE/SAE radio network element E-UTRAN.
  • the E-UTRAN initiates a redirect request message to the MME according to the information in the measurement report.
  • the MME sends a forward redirect request message to the S-IWF according to the information in the redirect request message, instructing the S-IWF to switch the corresponding session to the CS domain access.
  • the S-IWF and the CS domain network element VMSC and the GERAN/UTRAN complete the handover request and handover requirement of the CS domain inter-office handover and the response process thereof;
  • the inter-office handover includes: the S-IWF sends a MAP preparation handover request message to the VMSC, the VMSC sends a handover request message to the GERAN/UTRAN, and the GERAN/UTRAN sends a handover request confirmation message to the VMSC, and the VMSC returns a MAP preparation handover request confirmation message to the S-IWF.
  • the message carries a handover number (HO#).
  • the S-IWF sends an initial address message of the ISUP to the VMSC according to the handover number, and the VMSC sends an ISUP address full message to the S-IWF.
  • the S-IWF sends a handover notification message to the ICCF/VCC AS, informing the VCC AS that the LTE/SAE to CS domain handover of the single radio channel occurs (that is, the single radio channel is about to be performed) Voice business continuity domain switching);
  • the notification message may notify the ICCF/VCC through the VMSC and the HSS using the USSD (Unstructured Supplementary Service Data) message.
  • USSD Unstructured Supplementary Service Data
  • the notification message may also use a SIP message message, and the S-IWF notifies the VCC AS through the CSCF.
  • the S-IWF sends an ISUP initial address message to the ICCF/VCC AS by using the VMSC of the CS domain and the MGCF and the CSCF of the IMS domain, where the message carries the VDN (indicating that the session is switched from the IMS domain to the CS domain at the service layer);
  • the /VCC AS returns a response message to the S-IWF, indicating that the handover from the IMS domain to the CS domain has been completed;
  • the S-IWF initiates a voice service continuity handover request to the VCC AS through the ISUP initial address message in the step, requesting to switch from the IMS domain to the CS domain.
  • the session resource of the ICCF/VCC AS to the UE is not released after completing the handover from the IMS domain to the CS domain according to the notification message;
  • the domain switching of the continuity of the voice service of the single wireless channel may be carried by carrying a specific VDN number, and the ICCF/VCC AS identifies the LTE/SAE network under the SRVCC to switch to the CS network according to the specific VDN number in the ISUP initial address message.
  • the session resources of the ICCF/VCC AS to the UE are not released after the completion of the handover from the IMS domain to the CS domain.
  • the S-IWF sends a forward relocation request confirmation message to the MME.
  • the MME sends a relocation request confirmation message to the E-UTRAN.
  • the E-UTRAN sends a relocation command message to the UE.
  • the UE sends a handover access message to the target GERAN/UTRAN;
  • the GERAN/UTRAN After detecting the handover, the GERAN/UTRAN sends a handover detection message to the VMSC. 213.
  • the VMSC sends a MAP processing access signaling message to the S-IWF, where the message notifies that the S-IWF user terminal has started to access from the CS domain. ;
  • the UE sends a handover complete message to the GERAN/UTRAN. 215.
  • the GERAN/UTRAN sends a handover complete message to the SMSC through the VMSC.
  • the VMSC sends a MAP_SEND_END_ SIGNAL message (MAP sending end signal) message to the S-IWF, and notifies the S-IWF user terminal that the user terminal has switched to the CS domain;
  • MAP_SEND_END_ SIGNAL message MAP sending end signal
  • the S-IWF sends a release session notification message to the ICCF/VCC AS through the CSCF, to notify the ICCF/VCC AS to release the session resources of the ICCF/VCC AS to the LTE/SAE.
  • the release session notification message may use the USSD message to notify the ICCF/VCC AS through the VMSC and the home subscriber server.
  • the release session notification message may also notify the VCC AS by using a SIP message, and the S-IWF initiates a subscription message to the VCC AS, subscribes to the session identifier of the VCC AS to the UE, and then instructs the VCC AS to release the VCC AS to the UE through the SIP indication message. Session resources.
  • the release session notification message may also notify the VCC AS by using a SIP message, such as a SIP message or a SIP session request message or a SIP re-session request message sent by the S-IWF to the VCC AS, instructing the VCC AS to release the VCC AS to the UE. Session resources.
  • the ICCF/VCC AS after receiving the release session notification message in step 217, releases the IMS domain session resources in the IF/SAE network of the ICCF/VCC AS in the session, and simultaneously releases related session resources of the LTE/SAE network.
  • the ICCF/VCC AS also sends an update bearer message to the far end of the session;
  • the VMSC sends an ISUP response message to the S-IWF (corresponding to the ISUP initial address message in step 205);
  • the S-IWF After the handover is completed, the S-IWF notifies the LTE/SAE network to release the corresponding resources of the session;
  • the UE finds that the handover is not successful (for example, if the UE fails to access the wireless GERAN/UTRAN in step 211, the UE determines that the handover fails), and then sends a return original channel message to the E-UTRAN, E-UTRAN Then, according to the received return original channel message, a handover cancel message is sent to the MME, the S-IWF, and the CS domain network element, so that the UE can return to the original session channel to continue the call.
  • the present invention implements LTE/SAE to CS based on the SRVCC architecture in FIG. 8.
  • the UE initiates a session in the IMS domain through the LTE/SAE network, and anchors the VCC AS of the IMS domain.
  • the handover method of this embodiment includes the following steps:
  • the UE sends a measurement report to the LTE/SAE radio network element E-UTRAN.
  • the E-UTRAN sends a redirect request message to the MME according to the information in the measurement report.
  • the MME sends a forward redirect request message to the S-IWF according to the information of the redirect request message, indicating that the S-IWF will Switching to the CS domain access corresponding to the session;
  • the S-IWF and the CS domain network element VMSC and the GERAN/UTRAN complete the handover request and handover request of the CS domain inter-office handover and the response process thereof;
  • the inter-office handover includes: the S-IWF sends a MAP preparation handover request message to the VMSC, the VMSC sends a handover request message to the GERAN/UTRAN, and the GERAN/UTRAN sends a handover request confirmation message to the VMSC, and the VMSC returns a MAP preparation handover request confirmation message to the S-IWF.
  • the message carries a handover number (HO#).
  • the S-IWF sends an initial address message of the ISUP to the VMSC according to the handover number, and the VMSC sends an ISUP address full message to the S-IWF.
  • the UE sends a release session notification message to the ICCF/VCC AS to notify the release of the session resource of the ICCF/VCC AS to the UE, where the message indicates that the LTE/SAE handover to the CS domain is completed.
  • the notification message uses the USSD message to notify the ICCF/VCC AS through the VMSC and the home subscriber server.
  • the ICCF/VCC AS releases the session resources of the IMS domain session resource and the LTE/SAE in the LTE/SAE network in the session, and the ICCF/VCC AS also sends the session resource.
  • the remote end of the session sends an update bearer message;
  • the VMSC sends an ISUP response message to the S-IWF (corresponding to the ISUP initial address message in step 305);
  • the S-IWF After the handover is completed, the S-IWF notifies the LTE/SAE network to release the corresponding resource of the session. 321 ⁇ 323, if the UE finds that the handover is not successful (for example, in step 311, the UE fails to access the wireless GERAN/UTRAN, the UE determines that the handover fails), and then sends a return original channel message to the E-UTRAN, E-UTRAN Then, the handover cancellation message is sent to the MME, the S-IWF, and the CS domain network element according to the received return original channel message, so that the UE can resume the call according to the original session channel established through the LTE/SAE.
  • FIG. 9 is an embodiment of the present invention, in which an LTE/SAE to CS domain handover is implemented according to the SRVCC architecture of FIG. 3, where an intra-office handover is used between the IWF and the VMSC, as shown in FIG. 9, the handover procedure of this embodiment is shown in FIG. Including the following steps:
  • a session is initiated between the UE and the UE-B in the IMS, and is anchored to the VCC AS.
  • the UE is attached to the CS network by using an LTE/SAE network.
  • the UE initiates a CS call through the LTE/SAE network, and completes the access process (including encryption, authorization, etc.);
  • the UE sends a call setup message (SETUP message) to the network side, where the message carries a specific VDN as the called number.
  • SETUP message a call setup message
  • a Single Radio UE carries a specific VDN to distinguish it from a normal Dual Radio UE.
  • the IWF saves call setup information.
  • the UE sends a measurement report to the LTE/SAE radio network element E-UTRAN.
  • E-UTRAN decides to switch
  • the E-UTRAN sends a handover request message to the MME according to the information in the measurement report.
  • the MME sends a handover request message to the IWF.
  • the IWF sends a call setup message (SETUP message) to the VMSC according to the information saved in step 405, where the message carries a special VDN as the called number.
  • SETUP message a call setup message
  • the VMSC sends an ISUP initial address message according to the special VDN to establish a call to the MGCF.
  • the MGCF After receiving the ISUP initial address message in step 411, the MGCF establishes a SIP session to the VCC AS by using the special VDN.
  • the step 425 and the step 412 are performed simultaneously.
  • the VCC AS does not immediately perform the operation of releasing the session message to the UE through the LTE/SAE network, but waits for the UE. An indication of the completion of the handover;
  • the VCC AS may temporarily not perform the operation of releasing the session message to the UE through the LTE/SAE network.
  • the MGCF sends an ISUP response message to the VMSC after the SIP session is successfully established.
  • the VMSC sends a response message ( CONNECT message) to the UE;
  • the VMSC sends a channel assignment request message to the IWF, and the IWF returns a channel assignment response message to complete the channel assignment process.
  • the IWF sends a handover request message to the VMSC according to the handover request message received in step 409;
  • the VMSC sends a handover request message to the target GERAN/UTRAN.
  • the target GERAN/UTRAN completes the reservation of the resource, and sends a handover response message to the VMSC.
  • the VMSC sends a handover command message to the IWF.
  • the IWF sends a handover response message to the MME.
  • the MME sends a handover command message to the E-UTRAN.
  • the E-UTRAN sends a handover command message to the UE.
  • the UE sends a handover access message to the target GERAN/UTRAN, and the access target
  • the GERAN/UTRAN After detecting the handover, the GERAN/UTRAN sends a handover detection message to the VMSC. 425-426, the UE handover is completed, and the VMSC receives the handover completion message.
  • the VMSC releases the resource on the handover initiation side.
  • the UE After the step 425, the UE notifies the VCC AS that the handover has been completed by using the USSD message.
  • the USSD message is forwarded by the network element entity such as the VMSC according to the standard USSD process.
  • the VCC AS After receiving the handover completion indication, the VCC AS sends the UE to the UE through the IMS domain and the LTE/SAE network. Initiating a release session message, releasing the IMS network resource of the VCC AS to the LTE/SAE network, and notifying the UE-B of the update 7 by the IMS domain;
  • step 432 if the UE finds that the handover fails (for example, in step 423, the UE fails to access the wireless GERAN/UTRAN, the UE determines that the handover has failed), and sends a return original channel message to the E-UTRAN, E-UTRAN Then, according to the received return original channel message, a handover cancel message is sent to the MME, the S-IWF, and the CS domain network element, so that the UE can return to the original session channel according to the original session resource to continue the call.
  • step 428 if the Gm interface is available, the UE may also notify the VCC AS that the handover has been completed through a SIP message.
  • the UE can return to the original session channel according to the original session resource that has not been released after the handover fails.
  • the UE sends a return original channel message to the E-UTRAN after the handover is found to be unsuccessful, and the E-UTRAN sends the original channel message to the MME, the S-IWF/IWF according to the received return original channel message. And the CS domain network element sends a handover cancel message, so that the UE can return to the original session channel to continue the call.

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Description

一种单无线信道语音业务连续性的域切换方法
技术领域
本发明涉及通信领域， 尤其涉及一种从下一代移动通信网络 LTE/SAE ( Long term Evolution ,长期演进 /System Architecture Evolution ,系统架构演进) 架构下接入单无线信道语音业务连续性（ Single Radio Voice Call Continuity, 简称 SRVCC ) 的域切换方法。 背景技术
为了保证语音业务在电路交换（ Circuit Switched,简称 CS )域和 IP( Internet
Protocol , 网络互联协议） 多媒体子系统 （IP Multimedia Core Network Subsystem, 简称 IMS ) 域之间的连续性， 即语音业务连续性 （ Voice Call Continuity, 简称 VCC ) , 传统的解决方案如图 1所示：
双模用户设备 ( User Equipment, 简称 UE )在 CS域和 IMS域均注册， 当 UE在 CS域或者 IMS域发起语音业务时， 均锚定到 IMS域的语音业务连 续性应用服务器（ Voice Call Continuity Application Server, 简称 VCC AS )中。 双模 UE中保存有两个 VCC AS已知的号码： VDK VCC Domain Transfer URI, VCC域切换通用标识），表示用户从 CS域切换到 IMS域； VDN( VCC Domain Transfer Number, VCC域切换号码）， 将用户会话在业务层从 IMS域切换到 CS域。 当双模 UE在 CS域发生了语音业务， 并且准备从 CS域切换到 IMS 域时， 双模 UE在 IMS域用 VDI作为被叫号码， 向 VCC AS发起会话请求， VCC AS收到该会话请求后，释放 CS域的资源，关联所建会话和原会话在 IMS 域的资源， 切换完成； 同理， 当双模 UE在 IMS域发起了语音业务， 准备从 IMS域切换到 CS域时，双模 UE在 CS域用 VDN作为被叫号码，向 VCC AS 发起会话请求， 当 VCC AS收到该会话请求后， 释放 IMS域的资源， 关联所 建会话和原会话在 IMS的资源， 切换完成。
以上描述的是传统的 VCC实现原理，其中的双模 UE必须同时支持 Dual Radio (双模双待） ， 即同时能在 IMS域和 CS域进行语音呼叫。 为了实现所有业务在 IMS域的集中控制 （ICS ) , 在 IMS域中增加了另 一个应用服务器 ICCF( IMS CS Control Function, IMS电路域控制功能）， ICCF 与 VCC AS相邻， 位于起呼的第一个 AS ( Application Server, 应用服务器）， 而在终呼中位于最后一个 AS。其他的 CS网络仅仅作为一种管道接入 IMS域， 所有业务均在 IMS域的 ICCF引导触发。
随着网络架构扁平化的发展，以及多种高速宽带可移动接入方式的出现， 促使移动通信网络提出了 LTE/SAE的下一代架构理念，使得演进的无线通信 系统能够提供更高的传输速率，更短的传输延时，更低的成本，同时支持 3GPP ( 3rd Generation Partnership Project, 第三代合作伙伴计划） 内部接入系统之 间的移动性，以及 3GPP接入系统和非 3GPP接入系统之间的移动性等。此外， LTE/SAE还将作为 IMS域的一种接入手段， 支持原有的 VCC功能。 然而由 于双模模式下对于手机电池能耗非常大和 LTE/SAE本身具有强大的移动性管 理能力等原因， 提出了单信道语音业务连续性 SRVCC, 目前实现 SRVCC的 两种方案的原理架构图分别如图 2和图 3所示， 其中：
LTE/SAE的相应网元主要包含：
E-UTRAN ( Evolved UTRAN, 演进的无线接入网）是下一代的无线接入 网， 可以提供更高的上下行速率， 更低的传输延迟和更加可靠的无线传输。
MME ( Mobility Management Entity, 移动管理实体）是控制面功能实体， 负责管理和存储 UE上下文（比如 UE/用户标识， 移动性管理状态， 用户安 全参数等） ， 为用户分配临时标识， 当 UE驻扎在该跟踪区域或者该网络时 负责对该用户进行鉴权。
SAE GW ( SAE Gateway, SAE网关）是用户面功能实体， 负责用户面数 据路由处理， 可分为 SGW ( Serving SAE GW, 服务 SAE GW )和 PDN GW ( Public Data Network, 公用数据网网关） 。 SGW是 SAE系统与传统 3GPP 系统间的移动锚点以及 E-UTRAN之间的移动锚点。 PDN GW终结处于闲置 状态的 UE的下行数据， 当发往 UE的下行数据到达时， 发起寻呼； 以及管理 和存储 UE的上下文， 比如 IP承载业务参数和网络内部路由信息等。
现有的 2G ( 2nd Generation, 第二代移动通信） /3G ( 3rd Generation, 第 三代移动通信）移动网络主要包含以下网元： 2G的 GERAN ( GSM/EDGE Radio Access Network, GSM/EDGE无线接 入网） ）或 3G的 UTRAN ( Universal Terrestrial Radio Access Network, 通用 陆地无线接入网） ， 以及核心网 （Core Network, 简称 CN ) 。 核心网网元包 含 CS域网元 VMSC ( Visited Mobile Services Switch Center, 拜访移动业务交 换中心 ) /MSC ( Mobile Services Switch Center, 移动业务交换中心 )和 PS域 (分组交换域） 网元 SGSN ( Serving GPRS Support Node, 服务 GPRS支持节 点） ， 其中 VMSC/MSC提供电路语音业务、 电路数据业务和短消息业务， SGSN与 LTE/SAE中的 SAE GW相连，提供 PS域业务。 HSS( Home Subscriber Server, 归属用户服务器）管理 CS域、 PS域和 IMS域的数据。
IMS网络主要包含如下网元：
CSCF ( Call Session Control Function, 核心网元呼叫会话控制功能） 、 MGCF ( Media Gateway Control Function, 媒体网关控制功能）等核心网元， 以及实现 VCC功能的 VCC AS。
以上所述为现有技术的网络， 为了实现单无线信道语音业务连续性， 增 加了一个单无线信道语音业务连续性控制功能， 如图 2 中的 S-IWF ( Shared Inter Working Function, 共享互通功能） 以及图 3 中的 IWF ( Inter Working Function, 互通功能） ， S-IWF/IWF与 2G/3G的 CS域的核心网网元 VMSC 和 PS域的核心网网元 SGSN、 以及 LTE/SAE 网络的 MME都相连， 控制 LTE/SAE网络与 2G/3G网络切换。 S-IWF/IWF还通过 IMS域网络的 CSCF与 ICCF/VCC AS相连， 保证所有呼叫都能锚定到 IMS域的 ICCF/VCC AS中， 保证 VCC基本功能的实现。
其中， 图 2所示的方案中， S-IWF与 VMSC之间接口釆用 E接口， E接 口釆用移动应用部分（ Mobile Application Part, 简称 MAP )信令， S-IWF与 VMSC之间切换釆用 CS域的局间切换方式；图 3所示的方案中，IWF与 VMSC 之间是 A/Iu-CS接口， IWF与 VMSC之间切换釆用 CS域的局内切换方式。
在上述的网络架构中， UE既能通过 LTE/SAE接入 IMS域， 也可以通过 2G/3G网络（如图中的 CS域接入设备 GERAN/UTRAN )的 PS域（即图中的 PS域接入设备 SGSN部分 )接入 IMS网络， 享受 IMS的业务， 同时还能接 入 2G/3G的 CS网络（即图中的 VMSC/MGW ) , 提供语音业务等 CS业务。 图 4是图 2所示 SRVCC架构下实现从 LTE/SAE切换到 CS域的流程， UE 和 UE-B之间在 IMS发起了一个会话， 并且锚定到了 VCC AS中； 图 4所示 切换流程包括以下步骤：
101 , UE向 LTE/SAE的无线网元 E-UTRAN发送测量报告；
102, E-UTRAN根据测量报告中的信息， 向 MME发起重定向请求消息；
103 , MME根据重定向请求消息的信息， 向 S-IWF发送向前重定向请求 消息， 指示 S-IWF将对应会话切换到 CS域接入；
104, S-IWF与 CS域网元 VMSC和 GERAN/ UTRAN之间完成 CS域局 间切换的切换请求和切换要求及其响应过程；
CS域局间切换包含： S-IWF向 VMSC发送 MAP准备切换请求消息， VMSC向 GERAN/UTRAN发送切换要求消息， GERAN/UTRAN向 VMSC回 送切换要求证实消息， VMSC向 S-IWF回 MAP准备切换请求证实消息， 所 述消息携带切换号码（HO# ) 。
105, S-IWF根据切换号码向 VMSC发送 ISUP ( ISDN User Part, 综合数 字业务用户部分）信令的初始地址消息， VMSC向 S-IWF回送 ISUP的地址 全消息；
106 , S-IWF通过 CS域的 VMSC和 IMS域的 MGCF和 CSCF向 ICCF/VCC AS发送 ISUP的初始地址消息， 所述消息携带 VDN,表示将会话在业务层从 IMS域切换到 CS域， ICCF/VCC AS向 S-IWF回送应答消息；
107 , ICCF/VCC AS通过 IMS域和 LTE/SAE网络向 UE发起释放会话消 息 , 并通过 IMS域通知 UE-B更新承载；
108, S-IWF向 MME会回送向前重定位请求证实消息；
109 , MME向 E-UTRAN回送重定位请求证实消息；
110, E-UTRAN向 UE回送重定位命令消息 （切换命令 ) ；
111 , UE发送切换接入消息到目标 GERAN/UTRAN;
112, GERAN/UTRAN检测到切换后， 向 VMSC发送切换检测到消息； 113 , VMSC向 S-IWF发送 MAP处理接入信令消息 ,所述消息通知 S-IWF 用户终端已经开始从 CS域接入；
114, UE向 GERAN/UTRAN发送切换完成消息；
115, GERAN/UTRAN通过向 VMSC向 S-IWF发送切换完成消息； 116, VMSC向 S-IWF发送 MAP发送结束信号消息，通知 S-IWF用户终 端已经切换到 CS域， S-IWF根据该 MAP结束信号消息判断切换完成；
117, VMSC向 S-IWF回送 ISUP应答消息 （对应步骤 105的 ISUP初始 地址消息） ；
118, 切换完成后， S-IWF通知 LTE/SAE网络释放资源。
如果在步骤 107, VCC AS已经释放了 LTE/SAE资源， 则该步骤不再执 行。
图 5是图 3所示 SRVCC架构下实现呼叫从 LTE/SAE切换到 CS域的流 程， 主要包含以下步骤：
S101 , UE和 UE-B之间在 IMS发起了一个会话， 并且锚定到了 VCC AS 中；
5102, UE通过 LTE/SAE网络附着在 CS网络；
5103 , UE通过 LTE/SAE网络发起 CS呼叫， 完成接入过程（包括加密、 授权等） ；
S104, UE给网络侧 （IWF )发送呼叫建立消息 （SETUP 消息） ， 该消 息中携带 VDN作为被叫号码；
5105, IWF保存呼叫建立信息；
5106 , UE向 LTE/SAE无线网元 E-UTRAN发送测量报告；
5107, E-UTRAN决定切换；
S108, E-UTRAN根据测量报告中的信息， 向 MME发切换请求消息；
S 109 , MME向 IWF发送切换请求消息； 5110, IWF根据步骤 S105保存的信息给 VMSC发呼叫建立消息（ SETUP 消息） ， 该消息中携带 VDN作为被叫号码；
在步骤 S110后， 会同时分别进行步骤 Sl l l~ S115和步骤 S116~ S128:
5111 , VMSC根据呼叫建立消息中的 VDN, 发送 ISUP的初始地址消息 以建立到 MGCF的呼叫；
5112, MGCF收到 ISUP初始地址消息后，建立到 VCC AS的 SIP( Session Initial Protocol, 初始会话协议）会话；
5113 , MGCF在 SIP会话建立成功后给 VMSC发 ISUP应答消息；
5114, VMSC给 UE发应答消息 （CONNECT (连接） 消息） ；
S 115 , VCC AS通过 IMS域和 LTE/SAE网络向 UE发起释放会话消息， 并通过 IMS域通知 UE-B更新 7 载。
5116, VMSC给 IWF发信道指派请求消息， IWF返回信道指派响应消息， 完成信道指派流程；
5117, IWF紧接着根据步骤 S109中接收到的信息给 VMSC发切换请求 消息；
5118 , VMSC向目标 GERAN/UTRAN发切换请求消息；
5119, 目标 GERAN/UTRAN完成资源的预留， 给 VMSC发切换响应消 息；
5120, VMSC给 IWF发切换命令消息；
S121 , IWF给 MME发切换响应消息；
5122 , MME给 E-UTRAN发切换命令消息；
5123 , E-UTRAN给 UE发切换命令消息；
5124 , UE 发送切换接入消息到目标 GERAN/UTRAN , 接入目标 GERAN/UTRAN;
S125, GERAN/UTRAN检测到切换后， 向 VMSC发送切换检测到消息；
S126-S127, UE切换完成， VMSC收到切换完成消息； S128, VMSC释放切换发起侧 LTE/SAE的资源。
上述技术存在如下问题： 在 ICCF/VCC AS收到 ISUP的初始地址消息后 (步骤 106和步骤 S111 ) , 会释放 ICCF/VCC AS和 UE之间经由 LTE/SAE 建立的会话， 而此时 UE可能还没有收到切换命令， 或者正在切换中， 此时 的会话路径如图 6所示， UE和远端节点之间只有 CS网络到远端节点之间是 通的， 只有当 UE成功切换到 CS域之后， UE和远端节点的会话才能接通； 如果 UE没有成功切换到 CS域， 由于 VCC AS与 LTE/SAE网络之间的会话 资源已经被释放， UE无法返回原来的会话通道继续会话。
发明内容
本发明要解决的技术问题是提供一种单无线信道语音业务连续性的域切 换方法， 以便在 UE无法从 LTE/SAE 网络成功切换到 CS域时， 可以返回 LTE/SAE网络的原会话通道继续会话。
为了解决上述问题， 本发明提供一种单无线信道语音业务连续性的域切 换方法， 用户设备 UE通过长期演进 LTE/系统架构演进 SAE网络接入， 与远 端节点建立了锚定到语音业务连续性应用服务器 VCC AS的 IP多媒体子系统 IMS会话；当共享互通功能 S-IWF接收到的 LTE/SAE网络发送的用于将所述 会话切换到从电路交换 CS域接入的切换请求后， 该方法包括：
LTE/SAE网络向 UE发送切换命令， 接收到所述切换命令后， UE向 CS 域的目标接入设备发送切换完成消息；
UE在发送所述切换完成消息后，或者 S-IWF在接收到 UE发送的用于表 示切换完成消息后， 向 VCC AS发送释放会话通知消息；
VCC AS在接收到所述释放会话通知消息后， 释放 VCC AS到 LTE/SAE 网络的所述会话的会话资源。
此外，当 S-IWF接收到的 LTE/SAE网络发送的所述切换请求后、 LTE/SAE 网络向 UE发送所述切换命令前， 还包括：
S-IWF向 VCC AS发送携带语音业务连续性域切换号码 VDN的语音业务 连续性切换请求； 所述 VDN用于指示 VCC AS进行单无线信道的语音业务 连续性的域切换；
VCC AS根据所述 VDN获知需要在接收到所述释放会话通知消息后才释 放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
此外，当 S-IWF接收到的 LTE/SAE网络发送的所述切换请求后、 LTE/SAE 网络向 UE发送所述切换命令前， 还包括：
向 VCC AS发送语音业务连续性切换请求指示其进行语音业务连续性的 域切换前， S-IWF向 VCC AS发送切换通知消息， 通知 VCC AS即将进行单 无线信道的语音业务连续性的域切换；
VCC AS根据所述切换通知消息获知需要在接收到所述释放会话通知消 息后才释放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
此外， 所述切换通知消息为： 非结构化补充业务数据 USSD消息、 或初 始会话协议 SIP的信息消息。
此外， 所述释放会话通知消息为： USSD消息、 或 SIP的指示消息、 或 SIP的信息消息、 或 SIP的会话请求消息、 或 SIP的再会话消息。
此外， VCC AS接收到所述释放会话通知消息后， 还释放 LTE/SAE网络
本发明还提供一种单无线信道语音业务连续性的域切换方法， UE通过 LTE/ SAE网络接入， 与远端节点建立了锚定到 VCC AS的 IMS会话； 当互 通功能 IWF接收到 UE发送的携带 VDN的呼叫建立消息和 LTE/SAE网络发 送的用于将所述会话切换到从 CS域接入的切换请求后，控制 LTE/ SAE网络 和 CS域网络进行后续的切换操作， 该方法包括：
UE接收到 LTE/SAE网络发送的切换完成消息后， 向 CS域的目标接入 设备发送切换接入消息和切换完成消息， 并向 VCC AS发送已完成切换的通 知消息；
VCC AS接收到所述已完成切换的通知消息后，释放 VCC AS到 LTE/SAE 网络的所述会话的会话资源。 此外， 所述 VDN用于指示 VCC AS进行单无线信道的语音业务连续性 的域切换；
IWF接收到 LTE/SAE 网络发送的所述切换请求后、 释放 VCC AS 到 LTE/SAE网络的所述会话的会话资源前， 还包括：
IWF向 VMSC发送包含所述 VDN的呼叫建立消息； 接收到所述呼叫建 立消息后， VMSC向媒体网关控制功能 MGCF发送包含所述 VDN的 ISUP 初始地址消息；
接收到所述 ISUP初始地址消息后， MGCF使用所述 VDN建立与 VCC AS 之间的 SIP会话；
VCC AS根据所述 VDN获知需要在接收到所述已完成切换的通知消息后 才释放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
此外， 接收到所述已完成切换的通知消息后， VCC AS还更新所述会话 的远端承载。
此外， 所述已完成切换的通知消息为： USSD消息、 或 SIP消息。
本发明提供了一种在 LTE/SAE和 2G/3G网络架构下单无线信道语音业务 连续性的实现方法， 解决了现有技术中进行从 LTE/SAE到 CS域的切换时， 如果切换不成功则不能返回原来的会话通道继续通话的问题。 附图概述
图 1传统的 VCC解决方案的示意图；
图 2为基于 LTE/SAE网络的 SRVCC架构图；
图 3为基于 LTE/SAE网络的另一 SRVCC架构图；
图 4为现有技术中基于图 2的 SRVCC实现 LTE/SAE向 CS域切换的流 程图；
图 5为现有技术中基于图 3的 SRVCC实现 LTE/SAE向 CS域切换的流 程图； 图 6为现有 SRVCC架构下从 LTE/SAE向 CS域切换不成功时的示意图； 图 7为本发明实施例基于图 2的 SRVCC实现 LTE/SAE向 CS域切换的 流程图；
图 8为本发明另一实施例基于图 2的 SRVCC实现 LTE/SAE向 CS域切 换的流程图；
图 9为本发明实施例基于图 3的 SRVCC实现 LTE/SAE向 CS域切换的 流程图。 本发明的较佳实施方式
下面将结合附图和实施例对本发明进行详细描述。
图 7为本发明基于图 2的 SRVCC架构下实现 LTE/SAE向 CS域切换的 一个实施例， UE在通过 LTE/SAE网络在 IMS域发起一个会话，并且锚定 IMS 域的 VCC AS中， 本实施例的切换方法包括以下步骤：
201 , UE向 LTE/SAE无线网元 E-UTRAN发送测量报告；
202, E-UTRAN根据测量报告中的信息， 向 MME发起重定向请求消息；
203 , MME根据重定向请求消息中的信息， 向 S-IWF发送向前重定向 请求消息， 指示 S-IWF将对应会话切换到 CS域接入；
204, S-IWF与 CS域网元 VMSC和 GERAN/ UTRAN之间完成 CS域的 局间切换的切换请求和切换要求及其响应过程；
局间切换包含： S-IWF向 VMSC发送 MAP准备切换请求消息， VMSC 向 GERAN/UTRAN发送切换要求消息， GERAN/UTRAN向 VMSC回送切换 要求证实消息， VMSC向 S-IWF回 MAP准备切换请求证实消息， 所述消息 携带切换号码（HO# ) 。
205 , S-IWF根据切换号码向 VMSC发送 ISUP的初始地址消息， VMSC 向 S-IWF回送 ISUP的地址全消息；
206 (可选 ) , S-IWF向 ICCF/VCC AS发送切换通知消息， 通知 VCC AS 有单无线信道的 LTE/SAE到 CS域的切换发生 (也就是即将进行单无线信道 的语音业务连续性的域切换） ；
在 ICCF和 VCC AS在同一网元和 UE在目标 VMSC已经注册的情况下 , 所述通知消息可以釆用 USSD ( Unstructured Supplementary Service Data, 非结 构化补充业务数据 ) 消息通过 VMSC和 HSS通知 ICCF/VCC AS。
所述通知消息也可以釆用 SIP的 message (信息 )消息， S-IWF通过 CSCF 通知 VCC AS。
207 , S-IWF通过 CS域的 VMSC和 IMS域的 MGCF和 CSCF向 ICCF/VCC AS发送 ISUP初始地址消息，所述消息携带 VDN(表示将会话在业务层从 IMS 域切换到 CS域）； ICCF/VCC AS向 S-IWF回应答消息，表示已经完成从 IMS 域到 CS域的切换；
S-IWF通过该步骤中的 ISUP初始地址消息，向 VCC AS发起语音业务连 续性切换请求， 请求从 IMS域切换到 CS域。
同时，如果 ICCF/VCC AS收到步骤 206的通知消息， 则才艮据所述通知消 息，在完成 IMS域到 CS域的切换后不释放 ICCF/VCC AS到 UE的会话资源； 或者， 该步骤 207中， 可以通过携带一个特定的 VDN号码， 表示单无线 信道语音业务连续性的域切换， ICCF/VCC AS根据 ISUP初始地址消息中的 特定 VDN号码标识 SRVCC下的 LTE/SAE网络向 CS网络切换，而不是仅仅 标识 IMS域切换到了 CS域， 从而在完成 IMS域到 CS域的切换后不释放 ICCF/VCC AS到 UE的会话资源。
208, S-IWF向 MME回送向前重定位请求证实消息；
209 , MME向 E-UTRAN回送重定位请求证实消息；
210, E-UTRAN向 UE回送重定位命令消息；
211 , UE发送切换接入消息到目标 GERAN/UTRAN;
212, GERAN/UTRAN检测到切换后， 向 VMSC发送切换检测到消息； 213 , VMSC向 S-IWF发送 MAP处理接入信令消息，所述消息通知 S-IWF 用户终端已经开始从 CS域接入；
214, UE向 GERAN/UTRAN发送切换完成消息； 215, GERAN/UTRAN通过向 VMSC向 S-IWF发送切换完成消息；
216, VMSC向 S-IWF发送 MAP— SEND— END— SIGNAL消息（ MAP发送 结束信号） 消息， 通知 S-IWF用户终端已经切换到 CS域；
217, S-IWF通过 CSCF向 ICCF/VCC AS发送释放会话通知消息， 通知 ICCF/VCC AS释放 ICCF/VCC AS到 LTE/SAE的会话资源；
在 ICCF和 VCC AS在同一网元和 UE已经在目标 VMSC已经登记的情 况下， 所述释放会话通知消息可以釆用 USSD消息， 通过 VMSC和归属用户 服务器通知 ICCF/VCC AS。
所述释放会话通知消息也可以釆用 SIP消息通知 VCC AS, S-IWF向 VCC AS发起一个订阅消息， 订阅 VCC AS到 UE的会话标识， 然后通过 SIP指示 消息指示 VCC AS释放 VCC AS到 UE的会话资源。
所述释放会话通知消息也可以釆用 SIP消息通知 VCC AS, 例如 S-IWF 向 VCC AS发起的 SIP message 消息或者 SIP会话请求消息或者 SIP再会话请 求消息等， 指示 VCC AS释放 VCC AS到 UE的会话资源。
218, ICCF/VCC AS收到步骤 217的释放会话通知消息后， 释放该会话 中 ICCF/VCC AS 到 LTE/SAE 网络中 IMS 域会话资源， 也可以同时释放 LTE/SAE网络的相关会话资源， 同时 ICCF/VCC AS还向会话的远端发送更 新承载消息；
219, VMSC向 S-IWF回送 ISUP应答消息 （对应步骤 205的 ISUP初始 地址消息） ；
220 , 切换完成后， S-IWF通知 LTE/SAE网络释放该会话相应的资源；
221 ~ 223 , 如果 UE发现切换没有成功（比如在步骤 211中， UE接入到 无线 GERAN/UTRAN失败， UE就会判断出切换失败） ， 则向 E-UTRAN发 送返回原信道消息， E-UTRAN则根据收到的返回原信道消息向 MME、 S-IWF 以及 CS域网元发送切换取消消息，从而使 UE能够返回原来的会话通道继续 通话。
如图 8所示，为本发明基于图 2下的 SRVCC架构下实现 LTE/SAE向 CS 域切换的另一个实施例， UE在通过 LTE/SAE网络在 IMS域发起一个会话， 并且锚定 IMS域的 VCC AS中， 本实施例的切换方法包括以下步骤：
301 , UE向 LTE/SAE无线网元 E-UTRAN发送测量报告；
302, E-UTRAN根据测量报告中的信息， 向 MME发起重定向请求消息； 303 , MME根据所述重定向请求消息的信息， 向 S-IWF发送向前重定向 请求消息， 指示 S-IWF将对应会话切换到 CS域接入；
304, S-IWF与 CS域网元 VMSC和 GERAN/ UTRAN之间完成 CS域的 者局间切换的切换请求和切换要求及其响应过程；
局间切换包含： S-IWF向 VMSC发送 MAP准备切换请求消息， VMSC 向 GERAN/UTRAN发送切换要求消息 , GERAN/UTRAN向 VMSC回送切换 要求证实消息， VMSC向 S-IWF回 MAP准备切换请求证实消息， 所述消息 携带切换号码（HO# ) 。
305, S-IWF根据切换号码向 VMSC发送 ISUP的初始地址消息， VMSC 向 S-IWF回送 ISUP的地址全消息；
306 ~ 316,请参见上一实施例中步骤 206 ~ 216中的描述，此处不再赘述；
317, UE向 ICCF/VCC AS发送释放会话通知消息， 通知释放 ICCF/VCC AS到 UE的会话资源， 该消息表示 LTE/SAE向 CS域切换完成；
在 ICCF和 VCC AS在同一网元和 UE已经在目标 VMSC已经登记的情 况下所述通知消息釆用 USSD 消息， 通过 VMSC 和归属用户服务器通知 ICCF/VCC AS„
318, ICCF/VCC AS收到步骤 317的释放会话通知消息后， 释放该会话 中 ICCF/VCC AS到 LTE/SAE网络中 IMS域会话资源和 LTE/SAE的会话资源， 同时 ICCF/VCC AS还向会话的远端发送更新承载消息；
319, VMSC向 S-IWF回送 ISUP应答消息 （对应步骤 305的 ISUP初始 地址消息） ；
以上两个步骤 318和步骤 319无先后顺序。
320, 切换完成后， S-IWF通知 LTE/SAE网络释放该会话相应的资源。 321 ~ 323 , 如果 UE发现切换没有成功（比如在步骤 311中， UE接入到 无线 GERAN/UTRAN失败， UE就会判断出切换失败） ， 则向 E-UTRAN发 送返回原信道消息， E-UTRAN则根据收到的返回原信道消息向 MME、 S-IWF 以及 CS域网元发送切换取消消息， 从而使 UE能够根据经由 LTE/SAE建立 的原会话资源返回原来的会话通道继续通话。
图 9为本发明基于图 3的 SRVCC架构下实现 LTE/SAE向 CS域切换的 一个实施例， 其中 IWF和 VMSC之间釆用局内切换的方式， 如图 9所示， 本 实施例的切换流程包括如下步骤：
401 , UE和 UE-B之间在 IMS发起了一个会话， 并且锚定到了 VCC AS 中；
402, UE通过 LTE/SAE网络附着在 CS网络；
403 , UE经 LTE/SAE网络发起 CS呼叫， 完成接入过程（包括加密、 授 权等） ；
404, UE给网络侧发呼叫建立消息（SETUP消息） ， 该消息中携带特定 的 VDN为被叫号码；
单无线信道（ Single Radio )的 UE携带特定的 VDN, 以区别于普通的双 无线信道（ Dual Radio ) UE。
405, IWF保存呼叫建立信息；
406, UE向 LTE/SAE无线网元 E-UTRAN发送测量报告；
407, E-UTRAN决定切换；
408, E-UTRAN根据测量报告中的信息， 向 MME发切换请求消息；
409 , MME向 IWF发送切换请求消息；
410, IWF根据步骤 405中保存的信息给 VMSC发呼叫建立消息（ SETUP 消息） ， 消息中携带特殊的 VDN作为被叫号码；
411 , VMSC根据该特殊的 VDN,发送 ISUP初始地址消息以建立到 MGCF 的呼叫； 412, MGCF收到步骤 411中的 ISUP初始地址消息后 ,使用所述特殊 VDN 建立到 VCC AS的 SIP会话；
在步骤 410后， 步骤 425和步骤 412会同时进行， VCC AS根据所述特 殊 VDN,在会话建立成功后，并不立即执行通过 LTE/SAE网络向 UE发起释 放会话消息的操作， 而是等待 UE切换完成的指示；
此外， 即使上述 ISUP初始地址消息中携带的是普通的 VDN, VCC AS 也可以暂时不执行通过 LTE/SAE网络向 UE发起释放会话消息的操作。
413 , MGCF在 SIP会话建立成功后给 VMSC发 ISUP应答消息；
414, VMSC给 UE发应答消息 （ CONNECT消息 ) ；
415, VMSC给 IWF发信道指派请求消息， IWF返回信道指派响应消息， 完成信道指派流程；
416, 接着， IWF根据步骤 409中接收到的切换请求消息给 VMSC发切 换请求消息；
417, VMSC向目标 GERAN/UTRAN发送切换请求消息；
418,目标 GERAN/UTRAN完成资源的预留，给 VMSC发切换响应消息；
419, VMSC给 IWF发切换命令消息；
420 , IWF给 MME发切换响应消息；
421 , MME给 E-UTRAN发切换命令消息；
422 , E-UTRAN给 UE发切换命令消息；
423 , UE 发送切换接入消息到目标 GERAN/UTRAN , 接入目标
GERAN/UTRAN;
424 , GERAN/UTRAN检测到切换后， 向 VMSC发送切换检测到消息； 425 - 426, UE切换完成， VMSC收到切换完成消息；
427 , VMSC释放切换发起侧的资源；
428, UE在步骤 425后紧接着通过 USSD消息通知 VCC AS已完成切换， 该 USSD消息按照标准的 USSD流程经 VMSC等网元实体转发；
429, VCC AS收到切换完成指示后，通过 IMS域和 LTE/SAE网络向 UE 发起释放会话消息， 释放 VCC AS到 LTE/SAE网络的 IMS网络资源， 并通 过 IMS域通知 UE-B更新 7 载；
430 ~ 432, 如果 UE发现切换失败（比如在步骤 423中， UE接入到无线 GERAN/UTRAN失败， UE就会判断出切换已失败） ， 则向 E-UTRAN发送 返回原信道消息， E-UTRAN则根据收到的返回原信道消息向 MME、 S-IWF 以及 CS域网元发送切换取消消息，从而使 UE能够根据原会话资源返回原来 的会话通道继续通话。
在实际应用中， 步骤 428中， 如果 Gm口可用， 那么 UE也可以通过 SIP 消息通知 VCC AS已完成切换。
工业实用性
通过上述流程， 保证了整个切换流程的可行性； 同时， 也能使 UE在切 换失败后， 可以根据未被释放的原会话资源返回原来的会话通道。
例如， 如果步骤 211或步骤 423执行失败， 则 UE在发现切换没有成功 后， 向 E-UTRAN发送返回原信道消息， E-UTRAN则根据收到的返回原信道 消息向 MME、 S-IWF/IWF以及 CS域网元发送切换取消消息 , 从而使 UE能 够返回原来的会话通道继续通话。

Claims

权 利 要 求 书
1、 一种单无线信道语音业务连续性的域切换方法，其特征在于，用户设 备 UE通过长期演进 LTE/系统架构演进 SAE网络接入，与远端节点建立了锚 定到语音业务连续性应用服务器 VCC AS的 IP多媒体子系统 IMS会话；当共 享互通功能 S-IWF接收到的 LTE/SAE网络发送的用于将所述会话切换到从电 路交换 CS域接入的切换请求后， 该方法包括：
LTE/SAE网络向 UE发送切换命令， 接收到所述切换命令后， UE向 CS 域的目标接入设备发送切换完成消息；
UE在发送所述切换完成消息后，或者 S-IWF在接收到 UE发送的用于表 示切换完成消息后， 向 VCC AS发送释放会话通知消息；
VCC AS在接收到所述释放会话通知消息后， 释放 VCC AS到 LTE/SAE 网络的所述会话的会话资源。
2、 如权利要求 1所述的方法， 其特征在于，
当 S-IWF接收到的 LTE/SAE网络发送的所述切换请求后、 LTE/SAE网 络向 UE发送所述切换命令前， 还包括：
S-IWF向 VCC AS发送携带语音业务连续性域切换号码 VDN的语音业务 连续性切换请求； 所述 VDN用于指示 VCC AS进行单无线信道的语音业务 连续性的域切换；
VCC AS根据所述 VDN获知需要在接收到所述释放会话通知消息后才释 放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
3、 如权利要求 1所述的方法， 其特征在于，
当 S-IWF接收到的 LTE/SAE网络发送的所述切换请求后、 LTE/SAE网 络向 UE发送所述切换命令前， 还包括：
向 VCC AS发送语音业务连续性切换请求指示其进行语音业务连续性的 域切换前， S-IWF向 VCC AS发送切换通知消息， 通知 VCC AS即将进行单 无线信道的语音业务连续性的域切换； VCC AS根据所述切换通知消息获知需要在接收到所述释放会话通知消 息后才释放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
4、 如权利要求 3所述的方法， 其特征在于，
所述切换通知消息为： 非结构化补充业务数据 USSD消息、 或初始会话 协议 SIP的信息消息。
5、 如权利要求 1所述的方法， 其特征在于，
所述释放会话通知消息为： USSD消息、 或 SIP的指示消息、 或 SIP的信 息消息、 或 SIP的会话请求消息、 或 SIP的再会话消息。
6、 如权利要求 1所述的方法， 其特征在于，
VCC AS接收到所述释放会话通知消息后， 还释放 LTE/SAE网络的所述 会话的会话资源并更新所述会话的远端承载。
7、 一种单无线信道语音业务连续性的域切换方法， 其特征在于， UE通 过 LTE/ SAE网络接入， 与远端节点建立了锚定到 VCC AS的 IMS会话； 当 互通功能 IWF接收到 UE发送的携带 VDN的呼叫建立消息和 LTE/SAE网络 发送的用于将所述会话切换到从 CS域接入的切换请求后，控制 LTE/ SAE网 络和 CS域网络进行后续的切换操作， 该方法包括：
UE接收到 LTE/SAE网络发送的切换完成消息后， 向 CS域的目标接入 设备发送切换接入消息和切换完成消息， 并向 VCC AS发送已完成切换的通 知消息；
VCC AS接收到所述已完成切换的通知消息后，释放 VCC AS到 LTE/SAE 网络的所述会话的会话资源。
8、 如权利要求 7所述的方法， 其特征在于，
所述 VDN用于指示 VCC AS进行单无线信道的语音业务连续性的域切 换；
IWF接收到 LTE/SAE 网络发送的所述切换请求后、 释放 VCC AS 到
LTE/SAE网络的所述会话的会话资源前， 还包括： IWF向 VMSC发送包含所述 VDN的呼叫建立消息； 接收到所述呼叫建 立消息后， VMSC向媒体网关控制功能 MGCF发送包含所述 VDN的 ISUP 初始地址消息；
接收到所述 ISUP初始地址消息后， MGCF使用所述 VDN建立与 VCC AS 之间的 SIP会话；
VCC AS根据所述 VDN获知需要在接收到所述已完成切换的通知消息后 才释放 VCC AS到 LTE/SAE网络的所述会话的会话资源。
9、 如权利要求 7所述的方法， 其特征在于，
接收到所述已完成切换的通知消息后， VCC AS还更新所述会话的远端 承载。
10、 如权利要求 1所述的方法， 其特征在于，
所述已完成切换的通知消息为： USSD消息、 或 SIP消息。
PCT/CN2008/002157 2008-02-05 2008-12-31 一种单无线信道语音业务连续性的域切换方法 WO2009100609A1 (zh)

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