WO2010133112A1 - 一种单一无线语音呼叫连续性实现方法及单一无线语音呼叫连续性系统 - Google Patents

一种单一无线语音呼叫连续性实现方法及单一无线语音呼叫连续性系统 Download PDF

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Publication number
WO2010133112A1
WO2010133112A1 PCT/CN2010/071771 CN2010071771W WO2010133112A1 WO 2010133112 A1 WO2010133112 A1 WO 2010133112A1 CN 2010071771 W CN2010071771 W CN 2010071771W WO 2010133112 A1 WO2010133112 A1 WO 2010133112A1
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Prior art keywords
emsc
media
icp
message
agw
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PCT/CN2010/071771
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English (en)
French (fr)
Inventor
谢振华
郝振武
陶全军
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10777316.0A priority Critical patent/EP2432281B1/en
Priority to ES10777316T priority patent/ES2796120T3/es
Priority to KR1020117026947A priority patent/KR101385673B1/ko
Priority to RU2011154613/07A priority patent/RU2507714C2/ru
Priority to BRPI1010922A priority patent/BRPI1010922A2/pt
Priority to US13/258,360 priority patent/US8670411B2/en
Priority to JP2012511128A priority patent/JP5324703B2/ja
Publication of WO2010133112A1 publication Critical patent/WO2010133112A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H04W36/385—Reselection control by fixed network equipment of the core network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements

Definitions

  • the present invention relates to the field of communications, and in particular, to a method for implementing single-standby service continuity and a system for single-standby service continuity.
  • IP Multimedia Core Network Subsystem is an IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP) to build an open and flexible business environment. Support multimedia applications and provide users with rich multimedia services.
  • 3GPP 3rd Generation Partnership Project
  • the control layer and the service layer are separated.
  • the control layer does not provide specific services, and only provides the necessary triggering, routing, and accounting functions to the service layer.
  • the service triggering and control function in the control layer is completed by the Call Session Control Function (CSCF).
  • CSCF Call Session Control Function
  • Call session control functions are divided into: proxy call session control function (Proxy-CSCF, referred to as P-CSCF), query call session control function (Interrogating-CSCF, referred to as I-CSCF) and service call session control function (Serving-CSCF, referred to as S-CSCF) three types, of which the main responsibility is S-CSCF, I-CSCF is optional.
  • the service layer is composed of a series of application servers (ASs), which can provide specific service services.
  • the AS can be an independent entity or exist in the S-CSCF.
  • the control layer (S-CSCF) controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function.
  • AS and S-CSCF can be collectively referred to as Server Equipment (SE).
  • SE Server Equipment
  • the end-to-end device in the session is called User Equipment (UE), which is responsible for interaction with users.
  • UE User Equipment
  • Some UEs have multiple ways to access the network, including packet switching through 3GPP (Packet Switch, PS for short). ) domain access network, access through other non-3GPP PS domains
  • the network can even access the network through a Circuit Switch (CS) domain.
  • CS Circuit Switch
  • the CS network is configured with an enhanced mobile switching center (eMSC), and the eMSC provides a SIP (Session Initial Protocol) interface to interact with the IMS network, the interaction between the IMS network and the CS network can be performed through the eMSC. to realise.
  • eMSC enhanced mobile switching center
  • SIP Session Initial Protocol
  • SRVCC Radio Voice Call Continuity
  • FIG. 1 is a schematic diagram of a single-standby service continuity, which describes a signaling path and a media path for a single-standby terminal UE-1 to establish a session with an IMS terminal UE-2, and after a single-standby terminal service continuity occurs, UE-1 and UE-
  • the signaling path and media path of 2 in order to simplify the illustration and description, the S-CSCF and the Service Continuity AS (SC AS) are drawn into one entity, and the SIP protocol communication based on the IMS standard is used.
  • SC AS Service Continuity AS
  • A102 The signaling path between the UE-1 and the P-CSCF communicates with each other through the SIP protocol of the IMS. For the SC AS, this is an access leg path;
  • A104 The signaling path between the P-CSCF and the SC AS/S-CSCF communicates with each other through the IMS SIP protocol. For the SC AS, this also belongs to the Access leg path;
  • R101 The signaling path between the SC AS/S-CSCF and the UE-2 communicates with each other through the SIP protocol of the IMS. For the SC AS, this is the remote leg path; after the single-standby service continuity occurs The signaling path and the media path between UE-1 and UE-2 are changed.
  • the change of the signaling path is described as follows: A112: Signaling path between UE-1 and eMSC, signaling through CS domain Protocols communicate with each other. For SC AS, this is the Access leg path;
  • A114 Signaling path between eMSC and SC AS/S-CSCF, SIP protocol through IMS Communicate with each other, for SC AS, this also belongs to the Access leg path;
  • R101 The signaling path between the SC AS/S-CSCF and the UE-2 communicates with each other through the IMS SIP protocol. For the SC AS, this is the remote leg path, which occurs in the single-standby service continuity. After that, the remote path does not change.
  • Figure 2 is a diagram of the existing single-standby service continuity architecture. It describes the relevant parts or network elements of the network that participate in the implementation of the single-standby service continuity, and the interfaces or connection relationships between them. The description is as follows:
  • UE a user terminal device having a single-standby service continuity capability
  • a CS network a network providing a traditional CS service for a user
  • PS network control network element A network for providing users with PS services, whose control network element is MME (Mobility Management Entity) or SGSN (Serving GPRS Support Node); eMSC: Processing PS network control network The handover request sent by the meta, the inter-domain transfer of the execution session, the association of the CS handover operation with the inter-domain transfer operation, and the like;
  • MME Mobility Management Entity
  • SGSN Serving GPRS Support Node
  • eMSC Processing PS network control network The handover request sent by the meta, the inter-domain transfer of the execution session, the association of the CS handover operation with the inter-domain transfer operation, and the like;
  • IMS network A network that provides users with IMS services. Related interface description:
  • S202 An air interface between the UE and the CS network (referred to as a CS air interface), implements information interaction between the UE and the CS network, such as a standard Um interface;
  • S204 an air interface between the UE and the PS network control network element (referred to as a PS air interface) , implementing information exchange between the UE and the PS network control network element, such as a standard Uu interface;
  • S206 an interface between the CS network and the eMSC (which may be referred to as a CS signaling interface), and the interface between the eMSC and the base station subsystem is a standard Iu-CS interface, eMSC and other mobiles, depending on the specific network element connected.
  • the interface between the switching centers is a standard inter-office signaling interface, that is, an E interface and an Nc interface;
  • S208 The signaling interface between the control network element of the PS network control network element and the eMSC (which may be referred to as a domain) Inter-switching signaling interface) to provide inter-domain handover support, the interface is a standard SV interface;
  • S210 The PS network controls a signaling interface between the network element and the Internet, such as a standard SGi interface, which can provide IP data bearer for information interaction between the UE and the Internet, because the IMS network is on the Internet. Therefore, it can be regarded as a special Internet;
  • S212: The signaling path between the eMSC and the IMS network can be the 12 interface of the IMS-based SIP protocol between the standard eMSC and the IMS network, or can be the eMSC and the media.
  • the standard Nc interface between the gateways and the standard Mg interface between the media gateway and the IMS network are formed; if the latter, the media gateway translates the message on the Nc interface into an IMS SIP message or vice versa; the Nc interface can be based on the SIP protocol ( Nc-SIP) can also be based on the ISUP (ISDN User Protocol) protocol (Nc-ISUP).
  • Nc-SIP and 12 interfaces are based on the SIP protocol, the protocol only specifies the format of the message. The content of the message is determined by the application.
  • the use of the 12 interface indicates that the eMSC supports IMS-related applications, and the use of the Nc-SIP interface indicates eMSC supports traditional CS related applications.
  • Step 301 UE-1 serves the S204 interface with the PS network control network element.
  • the PS network control network element sends a measurement report, and the cell signal strength measurement information is reported above.
  • Step 302 The PS network control network element serving the UE-1 (the original PS network control network element) determines the vicinity according to the signal strength information of each cell in the measurement report.
  • the CS network is more suitable for serving UE-1, and then decides to perform the handover operation;
  • Step 303 the control network element in the original PS network control network element, such as the mobility management entity
  • the S208 interface between the network element and the eMSC is controlled by the PS network control network element, and a handover request is sent to the eMSC, for example, a Handover request message is sent, and the message carries the UE-1.
  • Number information and PS network control network The number information of the SC AS used to identify the service continuity request obtained by the Home Subscriber Server (HSS); Step 304: The eMSC performs a standard CS handover procedure to prepare the media link resource of the target CS network.
  • Step 305 After completing the CS handover process, the eMSC sends a handover response message to the PS network control network element through the S208 interface, for example, sending a Handover response message;
  • Step 306 After receiving the handover response message, the PS network control network element receives the handover response message.
  • Step 307 After receiving the handover command message, the UE-1 adjusts the access mode to access through the CS domain; A CS media connection path is established between the UE and the eMSC, and is composed of a CS media connection between the UE-1 and the CS network and a CS media connection between the CS network and the eMSC. The following steps occur after step 303 and have no sequential relationship with steps 304-307.
  • Step 308 After receiving the handover request message sent by the network control network element, the eMSC sends a call request to the SC AS.
  • the call request is sent through the signaling path of S212 (which may be referred to as an interconnection and communication path). It may be an INVITE message of the SIP or an IAM (Initial Address Message) message of the ISUP; the call request carries the number information of the UE-1 and the number information of the SC AS, where the number information of the SC AS is used as the called Information, the number information of UE-1 is used as the calling information.
  • Step 309 The SC AS finally receives the SIP INVITE message of the IMS forwarded by the CSCF.
  • the SC AS may determine that this is a service continuity request according to the called information, and then find an ongoing call associated with the call according to the calling information; Step 310, the signaling path of the SC AS in the associated ongoing call Sending an IMS update request to the UE-2 through the CSCF, for example, sending an UPDATE (update) or relNVITE (re-invitation) message; Step 311: After receiving the update request, the UE-2 responds to the IMS's consent update message, such as sending " 200 OK"message; Step 312: After receiving the consent update message forwarded by the CSCF, the SC AS sends an acknowledgement call message to the eMSC through the signaling path of S212, for example, sending a "200 OK" message, and the eMSC may eventually receive a SIP "200 OK". "Message, may also be an ANUP (Answer Message) message of ISUP;
  • a new media path is established between the eMSC and the UE-2, and the eMSC connects the newly created media path and the CS media path, so that the UE-1 can continue to talk with the UE-2.
  • the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, and to provide a single-standby service continuity implementation method and a single-standby service continuity system that do not need to update the remote end.
  • the present invention provides a method for implementing a single-standby service continuity, which includes the method of anchoring to an IP multimedia sub-device by a user terminal UE-1 and a remote end through a packet-switched PS network.
  • the system control point ICP and media are anchored to the IP Multimedia Subsystem IMS session of the ICP-controlled access gateway AGW:
  • the PS network control network element sends a handover request to the enhanced mobile switching center eMSC, requesting to switch the IMS session to access through the circuit switched CS network; after receiving the handover request, the eMSC prepares and prepares for the UE-1
  • the media link resource of the eMSC and sends a call request to the ICP; the ICP controls the AGW to associate the media link established by the call request with the remote media link of the IMS session.
  • the above method can also have the following characteristics:
  • the call request sent by the eMSC is an initial session protocol SIP call request message; the message carries a transport address H for receiving media data in the newly allocated new media link of the eMSC; and the call request is established at the ICP.
  • the ICP receives the transmission address H and the external receiving of the remote media link
  • the address F is associated, and the transport address J of the new media link for receiving the media data sent by the eMSC is sent to the eMSC by using a SIP answering call.
  • the foregoing method may further have the following feature: in the step of associating, by the ICP, the media link established by the call request with the remote media link of the IMS session: after the ICP receives the SIP call request message, Sending a mapping request to the access gateway AGW, where the request carries the transport address H;
  • the AGW associates the transport address H with the remote media link, and allocates the transport address J, and sends the transport address J to the ICP through a mapping response.
  • the above method may also have the following features:
  • the call request sent by the eMSC is an initial address message of the Integrated Services Digital Network User Protocol ISUP, where the message carries the line number of the line resource used by the eMSC end to transmit the CS media in the newly created media link.
  • the ICP returns an ISUP to the eMSC.
  • the ANM message carries the line number L2 of the line resource for transmitting CS media between the eMSC end and the remote end in the newly created media link.
  • the foregoing method may further have the following feature: in the step of associating, by the ICP, the media link established by the call request with the remote media link of the IMS session: after the ICP receives the initial address message, AGW sends a mapping request, the request Carrying the line number LI; after receiving the mapping request, the AGW associates the line number L1 with the remote media link, allocates the line number L2, and sends the line number L2 through a mapping response.
  • ICP in the step of associating, by the ICP, the media link established by the call request with the remote media link of the IMS session: after the ICP receives the initial address message, AGW sends a mapping request, the request Carrying the line number LI; after receiving the mapping request, the AGW associates the line number L1 with the remote media link, allocates the line number L2, and sends
  • the present invention provides a single standby service continuity system, which includes: a packet switched PS network control network element, a circuit switched CS network, an enhanced mobile switching center eMSC, an IP multimedia subsystem control point ICP, and access.
  • the PS network control network element is configured to: send a handover request to the eMSC, request to switch the IMS session to access through the CS network; and the IMS session is the user terminal UE-1 through the PS network
  • the signaling established with the remote end is anchored to the ICP and the medium is anchored to the ICP controlled access gateway AGW;
  • the eMSC is configured to: prepare the UE-1 with the eMSC after receiving the handover request Media link resources, and sending a call request to the ICP;
  • the ICP is configured to: control the AGW to associate the media link established by the call request with a remote media link of the IMS session.
  • the call request sent by the eMSC is an initial session protocol SIP call request message; the message carries a transport address H for receiving media data in the newly allocated new media link of the eMSC;
  • the ICP is further configured to: after receiving the SIP call request message, associate the transport address H with an external receive address F of the remote media link, and use the new media link for receiving
  • the transport address J of the media data sent by the eMSC is sent to the eMSC through a SIP answering call.
  • the system may also have the following features: the ICP is further configured to: after receiving the SIP call request message, send a mapping request to the AGW, where the request carries the transport address H; the AGW is set to: The transport address H is associated with the remote media link,
  • the above system may also have the following features:
  • the call request sent by the eMSC is an initial address message of the Integrated Services Digital Network User Protocol ISUP, and the message carries the line number of the line resource used by the eMSC end to transmit the CS media in the newly created media link.
  • the ICP is further configured to: after receiving the initial address message, return an ISAM message of the ISUP to the eMSC, where the message carries the new media link for transmission between the eMSC end and the remote end Line number L2 of the line resource of the CS media.
  • the system may also have the following features: the ICP is further configured to: after receiving the initial address message, send a mapping request to the AGW, where the request carries the line number L1; the AGW is set to: receive After the mapping request, the line number L1 is associated with the remote media link, and the line number L2 is allocated, and the line number L2 is sent to the ICP through the mapping response.
  • the present invention provides a control device supporting a single standby service continuity system, which includes a connected receiving module and an associated module, and the receiving module is configured to: receive a call request sent by the enhanced mobile switching center eMSC, And informing the association module; the association module is configured to: at the user terminal UE-1, establish a signaling anchor with the remote end through the packet-switched PS network, and anchor to the control device and media to control the control device After accessing the IP Multimedia Subsystem IMS session of the gateway AGW, the AGW is controlled to associate the media link established by the call request with the remote media link of the IMS session according to the received call request.
  • the control device may also have the following characteristics: the call request sent by the eMSC is an initial session protocol SIP call request message; the message carries a transport address H for receiving media data in the newly allocated new media link of the eMSC; The association module is further configured to: associate the transport address H with an external receiving address F of the remote media link, and use the new media link to receive media data sent by the eMSC The transport address j is sent to the eMSC via a SIP answering call.
  • the control device may also have the following features: The call request sent by the eMSC is an initial address message of the Integrated Services Digital Network User Protocol ISUP, where the message carries the line of the line resource used by the eMSC end to transmit the CS media in the newly created media link. No.
  • the association module is further configured to: return an ANM message of the ISUP to the eMSC, where the ANM message carries a line resource for transmitting CS media between the eMSC end and the remote end in the newly created media link.
  • Line number L2 the association module is further configured to: return an ANM message of the ISUP to the eMSC, where the ANM message carries a line resource for transmitting CS media between the eMSC end and the remote end in the newly created media link.
  • the invention provides an enhanced single-standby business continuity architecture and implementation method, which can effectively reduce the problem of excessive interruption time in the prior art and greatly improve the user experience.
  • FIG. 1 is a schematic diagram of a single standby service continuity diagram
  • FIG. 2 is a conventional single standby service continuity architecture diagram
  • FIG. 3 is a flow chart of an existing single standby service continuity implementation method
  • FIG. 5 is a schematic diagram of an enhanced single standby service continuity process according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an enhanced single standby service continuity architecture according to an embodiment of the present invention
  • FIG. Nc-SIP enhanced single standby service continuity flow chart 1
  • FIG. 8 is an architecture 1 based enhanced single standby service continuity flow chart 2 (Nc-ISUP) according to an embodiment of the present invention
  • Nc-ISUP enhanced single standby service continuity flow chart 2
  • FIG. 10 is a structural diagram of an ICP and an eMSC based on the architecture of FIG. 1 according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of an integrated ICP and AGW architecture based on the architecture diagram of the embodiment of the present invention
  • FIG. 13 is an ICP based on the architecture diagram 1 of the embodiment of the present invention; , AGW and PGW/GGSN integrated architecture diagram;
  • FIG. 14 is a schematic diagram of an enhanced single-standby service continuity architecture according to an embodiment of the present invention
  • FIG. 15 is a flow chart of enhanced single-standby service continuity (Nc-SIP) based on architecture 2 according to an embodiment of the present invention
  • FIG. 17 is a structural diagram of a combination of ICP and eMSC based on architecture 2 according to an embodiment of the present invention
  • FIG. 18 is an enhanced list based on FIG. 17 according to an embodiment of the present invention
  • FIG. 19 is a structural diagram of the ICP and SC AS based on the architecture diagram of the embodiment of the present invention
  • FIG. 20 is a flowchart of the enhanced single-standby service continuity based on FIG. 19 according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an enhanced single-standby service continuity architecture according to an embodiment of the present invention.
  • Standard SRVCC architecture part Same as each network element in Figure 2 except that it does not contain an IMS network; the extension part contains the following network elements:
  • ICP IMS Control Point
  • AGW Access Gate Way
  • AGW used to process media data forwarding
  • IMS network element This is the standard network element of the IMS network. Depending on the embodiment, the ICP and AGW may or may not be part of the IMS network. Description of related interfaces: S402 - S410: Same as S202 ⁇ S210 in Figure 2, because the extended part is based on the Internet, so the S410 interface is not connected to which specific network element;
  • S412 The IMS signaling interface of the UE and the extension part, where the interface is a logical interface, and is used for transmitting the IMS signaling of the interaction between the UE and the extension part; and the network element of the extension part is specifically connected with the network element of the extension part, depending on the specific embodiment, If the ICP and AGW are part of the IMS network, the interface may not be displayed and stated because it is a standard method;
  • S416 A signaling interface between the ICP and the AGW, the ICP uses the interface to control the AGW to allocate resources, map or associate media paths;
  • S418 A signaling interface between the ICP and the IMS network element, for transmitting an IMS protocol message between the UE and the P-CSCF, or an IMS protocol message between the P-CSCF and the I-CSCF/S-CSCF, or a CSCF and an SC AS IMS protocol message, depending on the location of the ICP;
  • Steps 501 ⁇ 502 UE-1 initiates an IMS call request, for example, sends an INVITE message, and the call request is actually transmitted by the S404 and S410 interfaces, and is carried on the IP bearer established by the PS network control network element, and thus passes through the PS network control network.
  • the call request carries the transport address information of the UE-1 for receiving the media data, which is represented as B; the call request is routed to the ICP, and the routing process may pass some network elements of the IMS network, or may not pass.
  • Step 503 The ICP requests the AGW to allocate an address resource through the S416 interface, for example, sending an allocation request message, where the message carries the transmission address information B; Step 504, the AGW allocates the port resources C and F, where the port F It is configured to receive the media data sent by the remote end, and establish an association relationship with the transport address information B, so that the media data received from the port F needs to be forwarded to the transport address B, and the port C is used to forward the media received by the port F.
  • the AGW indicates to the ICP to agree to the allocation through the S416 interface, such as sending an allocation response message, which carries the information of the port F; ,
  • the transmission address information corresponding to port F F still be a transmission including IP address and port address.
  • the B includes multiple transmission address information of the received media data
  • the step 503 may be a message carrying multiple transmission address information of the received media data, or multiple The message carries a transmission address information of the received media data.
  • the step 504 may be a message carrying multiple port information, or multiple messages carrying one port information respectively, and the specific implementation method does not affect the essence of the present invention. .
  • Step 505 The ICP replaces the transport address B of the IMS call request in step 502 with the transport address F, and then forwards the IMS call request to the far end.
  • Step 506 After receiving the IMS call request, the remote end sends an IMS response call, such as sending. 200 OK message, the message carrying the transmission address information of the remote end for receiving the media data, denoted as X;
  • Step 507 after receiving the IMS response call, the ICP requests the AGW to allocate the address resource through the S416 interface, for example, sending an allocation request The message carries the transport address information X.
  • Step 508 The AGW allocates the port resources D and E, where the port D is used to receive the media data sent by the UE-1, and establishes its association with the transport address X, so that the port D The received media data needs to be forwarded to the transport address X, and the port E is used to forward the media data received by the port D;
  • the AGW indicates the consent distribution to the ICP through the S416 interface, for example, sending an allocation response message, and the message carries the information of the port D.
  • the transmission address information corresponding to the port D is still represented as D.
  • the step 507 may be a message carrying multiple transmission address information of the received media data, or multiple messages, respectively carrying a transmission address information of the received media data;
  • the step 508 may also be a message carrying multiple port information, or multiple messages carrying one port information respectively, and the specific implementation method does not affect the essence of the present invention.
  • Steps 509 ⁇ 510, the ICP replaces the transport address X in the IMS answering call in step 506 with the transport address D, and then forwards the IMS answering call to the UE-1; the message may or may not pass through some IMS network elements.
  • the message is actually uploaded to the UE-1 by the IP bearer established by the PS network control network element, and therefore the network element is controlled by the PS network; thus, the UE-1 and the remote end establish the IMS medium.
  • the connection includes an IMS media connection 1 between the UE-1 and the AGW (referred to as IMS media 1) and an IMS media connection 2 between the AGW and the remote end (referred to as IMS media 2).
  • IMS media 1 between the UE-1 and the AGW
  • IMS media 2 IMS media connection 2 between the AGW and the remote end
  • Step 518 After receiving the handover request message of the PS network control network element control network element, the eMSC sends a call request to the ICP, and the request passes the signaling of S414.
  • the path is sent, so it may be an INVITE message of the SIP or an IAM (Initial Address Message) message of the ISUP;
  • the call request carries the number information of the UE-1 and the number information or identification information of the ICP, where the ICP The number information or the identification information is used as the called information, and the number information of the UE-1 is used as the calling information.
  • This step and the following steps occur after the step 513, and have no order relationship with the steps 514 to 517.
  • Step 519 The ICP determines 518 that the call request is a handover request of the session of 502 (the target of the call is the ICP number information or the identification information, and the caller's caller information may be associated with the session of step 502), requesting the AGW to perform the mapping operation, so that The new media is interconnected with the original IMS media 2.
  • the specific implementation varies with the architecture.
  • the eMSC may finally receive the "200 OK" message of the SIP, or may be the ANM message of the ISUP, depending on the specific connection mode; thus, a new media path is established between the eMSC and the AGW, and the eMSC will The new media path and the CS media path are connected, and the AGW connects the newly created media path with the IMS media connection 2, so that the UE-1 can continue to talk with the UE-2.
  • the control device supporting the single standby service continuity system (ie, the ICP in the present invention) of the embodiment of the present invention includes a connected receiving module and an associated module, and the receiving module is configured to: receive a call sent by the enhanced mobile switching center eMSC Requesting, and informing the association module; the association module is configured to: anchor the user equipment UE-1 to the control device and media anchor to the control device via the packet exchange PS network and the remote end After controlling the IP Multimedia Subsystem IMS session of the Access Gateway AGW, the AGW is controlled to associate the media link established by the call request with the remote media link of the IMS session according to the received call request.
  • the receiving module is configured to: receive a call sent by the enhanced mobile switching center eMSC Requesting, and informing the association module
  • the association module is configured to: anchor the user equipment UE-1 to the control device and media anchor to the control device via the packet exchange PS network and the remote end After controlling the IP Multimedia Subsystem IMS session of the Access Gateway AGW, the AGW is controlled to associate
  • the call request sent by the eMSC is an initial session protocol SIP call request message; the message carries a transport address H for receiving media data in the newly allocated new media link of the eMSC; the association module is further configured to: Associating the transport address H with the external receiving address F of the remote media link, and transmitting the transport address j of the new media link for receiving the media data sent by the eMSC by using a SIP answering call Give the eMSC.
  • the call request sent by the eMSC is an initial address message of the Integrated Services Digital Network User Protocol ISUP, where the message carries the line number L1 of the line resource used by the eMSC end to transmit the CS media in the newly created media link;
  • the device is configured to: return an ANM message of the ISUP to the eMSC, where the ANM message carries a line number L2 of the line resource for transmitting CS media between the eMSC end and the remote end in the newly created media link.
  • the interface information corresponding to S410 is no longer displayed and expressed in the following embodiments, which does not affect the complete description of the present invention, because the interface represents an IP connection relationship, and the IMS network and the extension part of the present invention are entirely It is a business network based on IP.
  • FIG. 6 is a schematic diagram of an enhanced single-standby service continuity architecture according to an embodiment of the present invention.
  • the related parts or network elements of the network that implement enhanced single-standby service continuity, and the interfaces or connection relationships between them are described as follows: NE description: Standard SRVCC architecture part: Same as each network element of Figure 4;
  • ICP Controls the AGW to allocate resources, map or associate media paths
  • AGW Used to implement forwarding of IP media data or forwarding between CS media data and IP media data; related interface description:
  • S612 An IMS signaling interface between the UE and the ICP, for transmitting IMS signaling between the UE and the P-CSCF through the ICP, for example, may be an IMS standard Gm interface;
  • S614 a signaling interface between the eMSC and the ICP, Passing the message in the process of establishing the link between the eMSC and the ICP, such as a standard Nc interface, which may be a SIP-based Nc-SIP interface or an ISUP-based Nc-ISUP interface;
  • S616 A signaling interface between the ICP and the AGW, enabling the ICP to control the AGW to allocate resources, mapping or associating the media path;
  • S618 signaling interface between the ICP and the IMS network element, for transmitting the IMS between the UE and the P-CSCF through the ICP Protocol messages, such as Gm interfaces that can be IMS standards;
  • FIG. 7 is an architecture 1 based enhanced single standby service continuity flow chart 1 (Nc-SIP) according to an embodiment of the present invention
  • FIG. 7 depicts an IMS session established between UE-1 and UE-2 after completion of IMS session establishment , UE-1 issued
  • Step 701 is similar to steps 501-510 of FIG. 5; wherein the IMS message transmission between the UE and the ICP does not pass through any standard IMS network element, and the UE-1 and the remote end establish an IMS media connection, including UE-1 and AGW. IMS media connection 1 and IMS media connection between AGW and remote
  • Step 702 is the same as steps 511 to 517 in FIG. 5;
  • Step 703 After receiving the handover request message of the PS network control network element controller network element, the eMSC sends a call request to the ICP, and the request is sent through the signaling path of S614.
  • the S614 interface uses the Nc-SIP interface, so the SIP INVITE message is sent, and the call request carries the number information of the UE-1 and the ICP number information or identification information, where the ICP number information Or the identification information is used as the called information, and the number information of the UE-1 is used as the calling information, and the message carries the transmission address H of the eMSC for receiving the media data.
  • This step may be performed before the completion of the step 702.
  • Step 704 The call request of the ICP judgment 703 is a handover request of the session in step 701, and the AGW is requested to perform a mapping operation, for example, sending a Map request message, where the message carries the transport address H of the eMSC and the original IMS media connection 2 The transmission address F, or the transmission address D of the original IMS media connection 1; Step 705, the AGW performs a mapping operation, connects the newly created media connection with the original IMS media connection 2, and allocates a new near-end media data receiving port J, for simplification The transmission address information corresponding to the port J is still represented as J.
  • the AGW sends a mapping response message to the ICP through the S616 interface, for example, sending a Map response message, where the message carries the AGW for receiving the media data.
  • the ICP sends an Nc-SIP response message to the eMSC through the S614 interface, for example, sending a "200 OK" message, where the message carries the obtained media resource information of the AGW;
  • a new media path is established between the eMSC and the AGW, and the eMSC establishes a new media path.
  • the AGW connects the new media path with the IMS media connection 2, so that the UE-1 can continue to talk with the UE-2.
  • FIG. 8 is a flow chart of the enhanced single standby service continuity based on architecture 1 according to an embodiment of the present invention.
  • Nc-ISUP (Nc-ISUP); Figure 8 shows that after the establishment of the IMS session between UE-1 and UE-2, UE-1 has single-standby service continuity, how UE-1 and the network implement the UE-1 to establish the CS domain.
  • the S614 interface uses the Nc-ISUP interface, so the IAM message of the ISUP is sent, and the eMSC is carried.
  • the line number L1 of the line resource for transmitting the CS media, the call request carries the number information of the UE-1 and the number information of the ICP, wherein the number information of the ICP is used as the called information, and the number information of the UE-1 is used as the calling information.
  • This step can be performed before the completion of step 802. For details, refer to the related description of step 518.
  • Step 804 The ICP determines that the call request of 803 is a handover request of the session of 801.
  • the ICP requests the AGW to perform a line assignment operation, such as sending a Line Alloc request message, where the message carries the obtained line number L1.
  • the message is transmitted through the S616 interface.
  • Step 805 After receiving the line allocation request, the AGW allocates a line resource for transmitting the CS media, and the corresponding line number is L2, and then sends a line allocation response to the ICP through the S616 interface, for example, Sending a Line Alloc response message carrying the assigned line number L2;
  • the ICP requests the AGW to perform a mapping operation, such as sending a Map request message, which carries the obtained line number L1 If steps 804 ⁇ 805 are performed, the message may also carry the obtained line number L2, which also carries the original IMS media connection 2
  • Step 807 the AGW performs a mapping operation, and connects the new media connection with the original IMS media connection 2.
  • mapping operation is carried.
  • Line number information so the AGW allocates a new line resource for transmitting CS media data, and the corresponding line number is set to L2; if steps 804-805 are performed, the line resource is allocated, and the AGW sends a mapping response to the ICP through the S616 interface.
  • the message for example, sends a Map response message. If 804 ⁇ 805 is executed, the message may not carry the line number information.
  • Step 808 ICP Receiving the mapping response, sending a response message of the Nc-ISUP to the eMSC through the S614 interface, for example, sending an ANM message, where the message carries the line information of the transmitted CS media data of the obtained AGW; thus, a new CS medium is established between the eMSC and the AGW.
  • Path the eMSC connects the newly created media path with the CS media path between the UE and the eMSC, and the AGW adds the new CS media path and the IMS. Connecting the connection member 2, so that UE-1 and UE-2 to continue to make a call.
  • FIG. 9 is a structural diagram of the ICP and PGW/GGSN architecture based on the architecture 1 according to the embodiment of the present invention, and describes related parts or network elements of the network, which are implemented to enhance the continuity of the single-standby service, and The interface or connection relationship between them is described as follows: Related network element description: Standard SRVCC architecture part: except for the PS network control network element, the other is the same as the network elements of Figure 4;
  • PGW/GGSN The network element connected to the Internet by the PS network control network element belongs to the network element of the PS network control network element, called the Packet Data Network Gate Way / Global GPRS Support Node (Global GPRS Support) Node), processing the interaction of the PS network control network element IP network, the network element adds an IMS Control Point (IMS Control Point) function, controls the AGW to allocate resources, maps or associates the media path;
  • IMS Control Point IMS Control Point
  • S902 - S908 Same as S402 ⁇ S408 in FIG. 4;
  • S912 IMS signaling interface between the UE and the PGW or GGSN, for transmitting IMS signaling between the UE and the P-CSCF through the PGW/GGSN, for example, may be IMS Standard Gm interface;
  • S914 A signaling interface between the eMSC and the PGW/GGSN, for transmitting messages in the eMSC and the PGW/GGSN link establishment process, such as a standard Nc interface, which may be SIP-based (Nc-SIP) or ISUP-based. (Nc-ISUP);
  • S916 A signaling interface between the PGW/GGSN and the AGW, enabling the PGW/GGSN to control the AGW to allocate resources, map or associate media paths;
  • FIG. 10 is a schematic diagram of an ICP and eMSC architecture based on the architecture of FIG. 1 according to an embodiment of the present invention, and describes related parts or network elements of the network that participate in the implementation of enhanced single-standby service continuity, and Inter-interface or connection relationship, described as follows:
  • Related network element description Standard SRVCC architecture part: except for eMSC, the other is the same as each network element of Figure 4;
  • eMSC Enhanced mobile switching center, processing PS network control network element The switching request is sent, the inter-domain transfer of the session is performed, and the CS switching operation is associated with the inter-domain transfer operation.
  • the network element adds an IMS Control Point function to control the AGW to allocate resources, map or associate the media path. ;
  • AGW Access Gate Way, which implements forwarding between CS media data and IP media data; related interface description:
  • S1002 - S1008 same as S402 ⁇ S408 in Figure 4;
  • S1012 IMS signaling interface between the UE and the eMSC, used to deliver the UE and the eMSC
  • IMS signaling between P-CSCFs such as the Gm interface of the IMS standard
  • S1016 A signaling interface between the eMSC and the AGW, so that the eMSC controls the AGW to allocate resources, map or associate the media path;
  • the signaling interface between the eMSC and the IMS network element is used to transmit the IMS protocol message between the UE and the P-CSCF through the eMSC, for example, the Gm interface of the IMS standard;
  • FIG. 11 is a flowchart of an enhanced single-standby service continuity flowchart based on FIG. 10 according to an embodiment of the present invention, and describes a process of establishing an IMS session between UE-1 and UE-2, and after the IMS session is established, UE-1 has a single-standby service continuity. How does UE-1 and the network implement the process of establishing a media connection by the UE-1 using the CS domain, and maintaining the original session continuation process. The target cell to which the UE-1 is handed over does not belong to the eMSC management.
  • Step 1101 The UE-1 initiates an IMS call request, for example, sends an INVITE message, where the request message is carried on an IP bearer provided by the PS network control network element, where the call request is carried.
  • the UE-1 is configured to receive the transmission address information of the media data, which is represented as B, and the message is routed to the eMSC, and the routing process does not pass through any network element of the IMS network.
  • Step 1102 The eMSC requests the address resource to be allocated to the AGW through the S1016 interface, for example, Sending an allocation request message, where the message carries the B transmission address information; Step 1103, the AGW allocates the port resources C and F, where the port F is used to receive the media data sent by the remote end, and The association relationship is such that the media data received by the port F needs to be forwarded to the transport address B.
  • the port C is used to forward the media data received by the port F, and then the device agrees to allocate the message to the eMSC through the S1016 interface, for example, sending an allocation response message.
  • the message carries port F.
  • the transport address information corresponding to port F is still denoted as F, and the transport address includes an IP address and a port; if the call to be established by UE-1 includes more than one medium, B includes transmission of multiple received media data.
  • the address information may be a message carrying multiple transmission address information of the received media data, or multiple messages, respectively carrying a transmission address information of the received media data, and the corresponding step 1103 is also a message carrying multiple ports.
  • Step 1104 The eMSC replaces the transport address B in step 1101 with the transport address F, and then forwards the IMS call request message.
  • Step 1105 After receiving the IMS call request message, the remote end sends an IMS response call message, for example, sending a "200 OK" message.
  • the message carries the transmission address information of the remote end for receiving the media data, denoted as X.
  • the eMSC receives the IMS response call message, and requests the AGW to allocate the address resource through the S 1016 interface, for example, sends an allocation request message, in the message.
  • port E is used to forward the media data received by port D, and then express the consent to the eMSC through the S1016 interface, for example, to send an allocation response message, the message carries the information of port D, in order to simplify the description, the corresponding transmission of port D
  • the address information is still represented as D; if X includes multiple transmission address information of the received media data, step 1106 may
  • the message is a message carrying multiple transmission address information of the received media data, and may also be multiple messages, respectively carrying a transmission address information of the received media data, and the corresponding step 1107 is also a message carrying multiple port information, or multiple The messages respectively carry a port information, and the specific implementation method does not affect the essence of the present invention.
  • Step 1108 The eMSC replaces the transport address X in step 1105 with the transport address D, and then forwards the IMS response call message.
  • the message does not pass through any IMS network element, and the message is transmitted to the UE, which is actually carried by the PS network control network element.
  • UE-1 and the far end establish an IMS media connection, including between UE-1 and AGW.
  • the following steps describe the inter-domain handover when UE-1 occurs.
  • Steps 1109 to 1111 are the same as steps 511-513 in FIG. 5;
  • Step 1112 The eMSC prepares media link resources of the target CS network according to a standard CS handover procedure.
  • the eMSC Since the target cell belongs to a different MSC, the eMSC sends the target MSC to the target MSC.
  • the handover request for example, sends a Handover Request message;
  • the target MSC responds with a handover response message, such as a Handover response message, carrying an inter-office handover number.
  • the line resource of the media sends a Line Alloc request than the 3 ⁇ 4 port;
  • Step 1115, the AGW receives the line resource allocation request, allocates the line resource for transmitting the CS media, and then responds to the allocated line number L1, for example, sends a Line Alloc response message, carries the line number.
  • Step 1116 the eMSC sends a link establishment request to the target MSC, for example, sending an IAM message, carrying the obtained line number L1 information;
  • Step 1117 the target MSC prepares the radio resource for the UE-1 according to the standard CS interoffice handover procedure.
  • Step 1118 the target MSC returns a link establishment response, such as sending an ANM message, carrying The target MSC is configured to transmit the information of the line number L2 of the line resource of the CS media data to the eMSC.
  • Step 1119 The eMSC requests the AGW to perform a mapping operation, such as sending a Map request message, carrying the obtained line number L1 or L2, At the same time, the transport address F of the original IMS media connection 2, or the transport address D of the original IMS media connection 1 is carried; Step 1120, the AGW performs a mapping operation, and connects the new media connection with the original IMS media connection 2, and the AGW uses the S1016 interface to The eMSC sends a mapping response message, for example, sending a Map response message.
  • Step 1122 After receiving the handover response message, the PS network control network element sends a handover command message to the UE-1 through the S1004 interface, for example, sends a Handover Command message to notify the UE-1 to switch to the CS domain; Step 1123, UE -1 receives the handover command and adjusts the access mode to access the CS domain; thus, the CS media connection path is established between UE-1 and the AGW, and the UE-1 and the CS network, the CS network and the target MSC, and the target MSC and The CS media connection between the AGWs is composed, and the new CS media is connected to the original IMS media connection 2 through the connection function of the AGW, so that the UE-1 can continue to talk with the UE-2.
  • FIG. 12 is a schematic diagram of a ICP and AGW architecture based on the architecture diagram of the embodiment of the present invention, and describes related parts or network elements of the network that participate in the implementation of enhanced single-standby service continuity, and Inter-interface or connection relationship, which is described as follows: Related network element description: Standard SRVCC architecture part: Same as each network element of Figure 4;
  • IACP IMS Access and Control Point function to allocate resources, map or associate media paths, forward IP media data, or forward between CS media data and IP media data.
  • the IMS signaling interface between the UE and the IACP is used to transmit the IMS signaling between the UE and the P-CSCF through the IACP, for example, the Gm interface of the IMS standard;
  • S1214 A signaling interface between the eMSC and the IACP, used to transmit messages in the process of establishing the eMSC and the IACP, such as a standard Nc interface, which may be SIP-based (Nc-SIP) or ⁇ IS-based (Nc) -ISUP ) ;
  • S1218 A signaling interface between the IACP and the IMS network element, used to deliver the UE and the IACP
  • the IMS protocol message between the P-CSCF may be the Gm interface of the IMS standard; the flow embodiment of the architecture is very similar to that of FIG. 7 and FIG. 8, and only the ICP and the AGW in the figure are combined into an IACP. The message flow becomes an internal process, so I won't go into details.
  • FIG. 13 is a schematic diagram of the ICP, AGW, and PGW/GGSN architecture based on the architecture diagram of the embodiment of the present invention, and describes related parts or networks of the network that are implemented to enhance the continuity of the single-standby service.
  • the elements, and the interfaces or connection relationships between them, are described as follows: Related network element description: Standard SRVCC architecture part: Same as the network elements of Figure 4;
  • PGW/GGSN The network element that the PS network control network element is connected to the Internet, belongs to the network element of the PS network control network element, and is called the Packet Data Network Gate Way / Global GPRS Support Node (Global GPRS Support) Node), handling the interaction of the PS network control network element IP network, the network element adds IMS Access and Control Point (IMS Access and Control Point) function, realizes allocation of resources, mapping or associated media path, IP media data forwarding or CS Forwarding between media data and IP media data; related interface description:
  • IMS Access and Control Point IMS Access and Control Point
  • the IMS signaling interface between the UE and the PGW/GGSN is used to transmit the IMS signaling between the UE and the P-CSCF through the PGW/GGSN, for example, the Gm interface of the IMS standard;
  • S1314 A signaling interface between the eMSC and the PGW/GGSN, which is used to transmit messages in the process of establishing the eMSC and the PGW/GGSN, such as a standard Nc interface, which may be SIP-based (Nc-SIP) or ISUP-based. (Nc-ISUP);
  • S1318 The signaling interface between the PGW/GGSN and the IMS network element is used to transmit the IMS protocol message between the UE and the P-CSCF through the PGW/GGSN, for example, the Gm interface of the IMS standard;
  • Figure 7 and Figure 8 are very similar, just change the ICP in the figure to PGW/GGSN, and is integrated with AGW, the message flow between them becomes an internal process, so it will not be described.
  • FIG. 14 is a schematic diagram of an enhanced single-standby service continuity architecture according to an embodiment of the present invention, and describes related parts or network elements of the network and interfaces between them to implement enhanced single-standby service continuity. Or a connection relationship, which is described as follows: Related network element description: Standard SRVCC architecture part: same as each network element of FIG. 4;
  • IMS Control Point which controls the AGW to allocate resources, map or associate media paths;
  • AGW Access Gate Way to forward IP media data or between CS media data and IP media data; Related interface description:
  • S1402 - S1408 Same as S402 ⁇ S408 in FIG. 4;
  • S1412 IMS signaling interface between the UE and the P-CSCF, for transmitting IMS signaling between the UE and the P-CSCF, for example, the Gm interface of the IMS standard ;
  • S1414 A signaling interface between the eMSC and the ICP, for transmitting messages in the eMSC and ICP link establishment process, such as a standard Nc interface, which may be SIP-based (Nc-SIP) or ISUP-based (Nc- ISUP);
  • S1416 A signaling interface between the ICP and the AGW that enables the ICP to control the AGW to allocate resources, map or associate media paths;
  • S1418 The signaling interface between the ICP and the IMS I-CSCF or the S-CSCF is used to transmit the IMS protocol message between the P-CSCF and the I-CSCF or the S-CSCF through the ICP, for example, the Mw interface of the IMS standard;
  • S1420 Signaling interface between ICP and P-CSCF for transmitting P-CSCF through ICP
  • the IMS protocol message between the I-CSCF or the S-CSCF may be the Mw interface of the IMS standard; S1418 and S1420 together form the S418 interface in FIG.
  • FIG. 15 is an architecture-based enhanced single-standby service continuity flow chart (Nc-SIP) according to an embodiment of the present invention.
  • Nc-SIP enhanced single-standby service continuity flow chart
  • Step 1502 is the same as steps 511 to 517 in FIG. 5;
  • Step 1503 After receiving the handover request message of the PS network control network element, the eMSC sends a call request to the ICP, and the request is sent through the signaling path of S1414.
  • the S1414 interface uses the Nc-SIP interface, so the SIP INVITE message is sent.
  • the call request carries the number information of the UE-1 and the ICP number information.
  • the ICP number information is used as the called information, UE- The number information of 1 is used as the calling information, and the message carries the transmission address H of the received media data of the eMSC.
  • This step can be performed before the completion of step 1502. For details, refer to the related description of step 518.
  • Step 1504 The ICP determines that the call request of 1503 is a handover request of the session of 1501, and requests the AGW to perform a mapping operation, such as sending a Map request message, carrying the transport address H of the eMSC and the transport address F of the original IMS media connection 2, Or the transmission address D of the original IMS media connection 1; Step 1505, the AGW performs a mapping operation, connects the newly created media connection with the original IMS media connection 2, and allocates a new near-end media data receiving port J, for simplicity of description, port J The corresponding transport address information is still represented as J. After the mapping operation is completed, the AGW passes the S1416 interface to the ICP.
  • a mapping operation such as sending a Map request message, carrying the transport address H of the eMSC and the transport address F of the original IMS media connection 2, Or the transmission address D of the original IMS media connection 1;
  • Step 1505 the AGW performs a mapping operation, connects the newly created media connection with the original IMS media connection 2, and allocate
  • Step 1506 the ICP receives the mapping response, and sends an Nc-SIP response message to the eMSC through the S1414 interface, for example, sending "200 OK" message, the message carries the obtained media resource information of the AGW; thus, a new IMS media path is established between the eMSC and the AGW, and the eMSC connects the newly created media path and the CS media path, and the AGW adds the new media path and the IMS.
  • the media connection 2 is connected so that the UE-1 can continue to talk with the UE-2.
  • the process of using the Nc-ISUP interface between the eMSC and the ICP in the architecture has the same IMS call establishment process as that of FIG. 15 , and the handover process is the same as that of FIG. 8 and therefore will not be described again.
  • FIG. 16 is a schematic diagram of the ICP and P-CSCF architecture based on the architecture diagram of the embodiment of the present invention, and describes related parts or network elements of the network that are implemented to enhance the continuity of the single-standby service. And the interface or connection relationship between them, the description is as follows: Related network element description: Standard SRVCC architecture part: Same as each network element of Figure 4; P-CSCF: Proxy CSCF, standard P-CSCF increases the signaling path anchoring function AGW: Access Gateway (Access GateWay), the function of media path anchoring; related interface description:
  • S1602 - S1608 Same as S402 ⁇ S408 in FIG. 4; Since the P-CSCF is an IMS network element, the signaling interface between the UE and the IMS network is not displayed and described, which is an IMS standard interface.
  • S1614 A signaling interface between the eMSC and the P-CSCF, used to transmit messages in the process of establishing the eMSC and the ICP, such as a standard Nc interface, which may be SIP-based (Nc-SIP), or may be used in ISUP. ( Nc-ISUP ) ;
  • S1616 The signaling interface between the P-CSCF and the AGW enables the P-CSCF to control the AGW to allocate resources, map or associate the media path.
  • the flow embodiment of the architecture is very similar to that of FIG. 15, and only the ICP and P in the figure are needed. -CSCF is one, so I won't go into details.
  • FIG. 17 is a schematic diagram of the ICP and eMSC architecture based on the architecture diagram of the embodiment of the present invention, and describes related parts or network elements of the network, and the network elements involved in implementing the enhanced single-standby service continuity. Inter-interface or connection relationship, described as follows: Related network element description: Standard SRVCC architecture part: except for eMSC, the other is the same as each network element of Figure 4; eMSC: Enhanced mobile switching center, processing PS network control network element The switching request is sent, the inter-domain transfer of the session is performed, and the CS switching operation is associated with the inter-domain transfer operation. The network element adds an IMS Control Point function to control the AGW to allocate resources, map or associate the media path. ;
  • AGW Access Gate Way, which implements forwarding between CS media data and IP media data; related interface description:
  • S1702 - S1708 Same as S402 ⁇ S408 in FIG. 4;
  • S1712 IMS signaling interface between the UE and the P-CSCF, for transmitting IMS signaling between the UE and the P-CSCF, for example, the Gm interface of the IMS standard ;
  • S1716 A signaling interface between the eMSC and the AGW, so that the eMSC controls the AGW to allocate resources, map or associate media paths;
  • S1718 The signaling interface between the eMSC and the I-CSCF or the S-CSCF of the IMS is used to transmit the IMS protocol message between the P-CSCF and the I-CSCF or the S-CSCF through the eMSC, for example, the Mw interface of the IMS standard;
  • S1720 A signaling interface between the eMSC and the P-CSCF, for transmitting an IMS protocol message between the P-CSCF and the I-CSCF or the S-CSCF through the eMSC, for example, an Mw interface of the IMS standard;
  • S1718 and S1720 form the S418 interface in Figure 4.
  • FIG. 18 is a flowchart of enhanced single-standby service continuity based on FIG. 17 according to an embodiment of the present invention, and describes a process of establishing an IMS session between UE-1 and UE-2, and after the IMS session is established, UE-1 has a single-standby service continuity. How does UE-1 and the network implement the process of establishing a media connection for the UE-1 to use the CS domain, and maintain the original session continuation process.
  • Step 1801 UE-1 initiates an IMS call request, for example, sends an INVITE message, where the request message is carried on an IP bearer provided by a PS network control network element, where the call request carries UE-1 for receiving media.
  • Data transmission address information denoted as B, the message is routed to the P-CSCF;
  • Step 1802 the P-CSCF forwards the call request, and the forwarded message arrives at the eMSC;
  • Steps 1803 to 1808 are the same as steps 1102 to 1107 of FIG. 11; 1809.
  • the eMSC replaces the transport address X in step 1806 with the transport address D, and then forwards the IMS response call message, and the message passes through the P-CSCF.
  • the UE, forwarding the message is actually carried over the PS network control element to establish an IP carrier network; this point, UE-1 and the distal end of IMS media connection is established, including between UE-1 and the AGW
  • IMS media connection 1 IMS media connection between the AGW and the remote 2.
  • Steps 1811 to 1814 are the same as steps 511 to 514 in FIG. 5, wherein the prepared CS media resource is identified by the line number L1 on the AGW; steps 1815 to 1818 are the same as steps 804 to 807 of FIG. 8;
  • the eMSC receives the mapping response and connects to the original PS network control network through the S1708 interface.
  • the UE sends a handover response message, for example, sends a Handover response message;
  • Step 1820 After receiving the handover response message, the PS network control network element sends a handover command message to the UE-1 through the S1704 interface, for example, sends a Handover Command message, and notifies the message.
  • the UE-1 switches to the CS domain.
  • FIG. 19 is a schematic diagram of the ICP and SC AS architecture based on the architecture diagram of the embodiment of the present invention, and describes related parts or network elements of the network involved in implementing the enhanced single-standby service continuity, and The interface or connection relationship between them is described as follows: Related network element description: Standard SRVCC architecture part: Same as each network element of FIG. 4;
  • SC AS The service continuity application server function of the IMS standard, newly adding the function of controlling the AGW to allocate resources, mapping or associating media paths;
  • AGW Access Gateway (Access GateWay), which implements IP media data forwarding; related interface description:
  • S1902 - S1908 Same as S402 ⁇ S408 in FIG. 4; Since the SC AS is an IMS network element, the signaling interface between the UE and the IMS network is not displayed and described, and it is an IMS standard interface.
  • S1914 the same as S414 in FIG. 4;
  • S1916 a signaling interface between the SC AS and the AGW, so that the SC AS controls the AGW to allocate resources, Map or associate media paths;
  • the signaling interface between the SC AS and the CSCF of the IMS is an ISC interface of the IMS standard
  • FIG. 20 is a flowchart of the enhanced single-standby service continuity based on FIG. 19 according to an embodiment of the present invention, and describes that a single-standby service occurs in UE-1 after the establishment of an IMS session between UE-1 and UE-2 is completed.
  • Continuity UE-1 and the network how to enable the UE-1 to establish a media connection using the CS domain and keep the original session continuous.
  • SC AS and the CSCF are drawn together, including the following steps: Step 2001, Steps 501 to 510 of FIG.
  • Step 2002 which is the same as steps 511 to 517 in FIG. 5;
  • Step 2003 After receiving the handover request message of the PS network control network element, the eMSC sends a call request to the SC AS, and the request is sent through the signaling path of S1914.
  • the S1914 interface uses the IMS standard 12 interface, so the SIP INVITE message is sent.
  • the call request carries the number information of the UE-1 and the number information of the SC AS.
  • the number information of the SC AS is used as the called party.
  • the information of the UE-1 is used as the calling information, and the message carries the transmission address H of the received media data of the eMSC.
  • This step can be performed before the completion of the step 2002. For details, refer to the related description of the step 518.
  • Step 2005 the AGW performs a mapping operation, connects the new media connection with the original IMS media connection 2, and allocates a new near-end media data receiving port J, for simplicity of description, the port The transport address information corresponding to J is still represented as J.
  • the AGW passes the S1916 interface.
  • the SC AS sends a mapping response message, for example, sends a Map response message, and the message carries the transmission address J of the AGW to receive the media data.
  • step 2006 the SC AS receives the mapping response, and sends a response message to the eMSC through the signaling path of S1914.
  • a "200 OK" message is sent, and the message carries the obtained media resource information of the AGW; thus, a new IMS media path is established between the eMSC and the AGW, and the eMSC connects the newly created media path and the CS media path, and the AGW adds the newly created media path. It is connected with the IMS media connection 2, so that the UE-1 can continue to talk with the UE-2.
  • steps 2003 to 2006 are the same as steps 703 to 706 of FIG. 7. If the Nc-ISUP interface is used, steps 2003 to 2006 and step 803 of FIG. 8 are used. 808 is the same.
  • the process from the SC AS side is the same, except that the media connection between the eMSC and the AGW is between the CS media connection between the eMSC and the media gateway and between the media gateway and the AGW.
  • the composition of the IMS media connection because the process is completely standardized, the various possibilities are not described here. While the invention has been described in connection with the specific embodiments, the modifications and the modifications Such modifications and variations are considered to be within the scope of the invention and the scope of the appended claims.
  • the present invention provides a single-standby business continuity implementation method and a single-standby business continuity system, which can effectively reduce the problem of excessive interruption time in the prior art and greatly improve the user experience.

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Description

一种单一无线语音呼叫连续性实现方法及单一无线语音呼叫
连续性系统 技术领域 本发明涉及通信领域， 尤其涉及一种单待业务连续性实现方法及单待业 务连续性系统。
背景技术
IP多媒体子系统（ IP Multimedia Core Network Subsystem, 简称 IMS )是 由第三代合作伙伴计划（ 3rd Generation Partnership Project, 简称 3GPP )提出 的一种基于 IP的网络架构， 构建了一个开放而灵活的业务环境， 支持多媒体 应用， 能够为用户提供丰富的多媒体业务。 在 IMS业务体系中 ,控制层和业务层是分离的，控制层不提供具体业务， 只向业务层提供必要的触发、 路由、 计费等功能。 控制层中业务触发和控制功能是呼叫会话控制功能（ Call Session Control Function, 简称 CSCF )完成的。 呼叫会话控制功能分为： 代理呼叫会话控制 功能 ( Proxy-CSCF , 简称 P-CSCF ) 、 查询呼叫会话控制功能 ( Interrogating-CSCF , 简称 I-CSCF ) 和服务呼叫会话控制功能 ( Serving-CSCF, 简称 S-CSCF )三种类型， 其中负主要责任的是 S-CSCF, I-CSCF是可选的。 业务层是由一系列应用服务器（Application Server, 简称 AS )组成， 能 提供具体业务服务， AS可以是独立的实体， 也可以存在于 S-CSCF中。 控制层（S-CSCF )根据用户的签约信息控制业务触发， 调用 AS上的业 务， 实现业务功能。 AS和 S-CSCF可以统称为服务设备（Server Equipment, 简称 SE ) 。 会话中的端到端设备称为用户设备 ( User Equipment, 简称 UE ) , 负责 与使用者的交互， 有的 UE具有多种接入网络的方式， 包括通过 3GPP的包 交换（Packet Switch, 简称 PS )域接入网络， 通过其他非 3GPP的 PS域接入 网络， 甚至可以通过电路交换（Circuit Switch, 简称 CS )域接入网络等。 如果 CS网络配置了增强移动交换中心（enhanced Mobile Switch Center, 简称 eMSC ) , 由 eMSC提供 SIP ( Session Initial Protocol, 初始会话协议） 接口来与 IMS网络交互，则 IMS网络与 CS网络的交互可以通过 eMSC来实 现。 对于具有多种接入方式的 UE而言， 如果该 UE某时刻只能使用一种接 入方式， 在一种接入方式下正在执行某项业务， 比如通话， 则当 UE移动到 其他地方而需要改变其使用的接入方式时， UE和网络能提供某种方式使 UE 正在执行的业务不被中断， 这样的能力我们称之为单待终端业务连续性， 简 称单待业务连续性（ Single Radio Voice Call Continuity, 简称 SRVCC ) 。 图 1是单待业务连续性示意图，描述了单待终端 UE-1与 IMS终端 UE-2 建立会话的信令路径和媒体路径， 以及发生单待终端业务连续性后， UE-1 与 UE-2的信令路径和媒体路径，为简化图示和描述，将 S-CSCF和业务连续 性 AS ( SC AS ) 画成一个实体， 两者间使用基于 IMS标准的 SIP协议通讯。 单待业务连续性发生前， UE-1和 UE-2间建立了会话， 其信令路径描述 下：
A102: UE-1和 P-CSCF之间的信令路径， 通过 IMS的 SIP协议互相通 讯， 对于 SC AS而言， 这是访问端 （Access leg )路径；
A104: P-CSCF和 SC AS/S-CSCF之间的信令路径， 通过 IMS的 SIP协 议互相通讯， 对于 SC AS而言， 这也属于访问端 （Access leg )路径；
R101 : SC AS/S-CSCF和 UE-2之间的信令路径， 通过 IMS的 SIP协议 互相通讯， 对于 SC AS而言， 这是远端 （Remote leg )路径； 单待业务连续性发生后， UE-1和 UE-2间的信令路径和媒体路径都发生 了变化， 其中信令路径的变化描述如下： A112: UE-1和 eMSC之间的信令路径，通过 CS域的信令协议互相通讯， 对于 SC AS而言， 这是访问端 （ Access leg )路径；
A114: eMSC和 SC AS/S-CSCF之间的信令路径， 通过 IMS的 SIP协议 互相通讯， 对于 SC AS而言， 这也属于访问端 （Access leg )路径;
R101 : SC AS/S-CSCF和 UE-2之间的信令路径， 通过 IMS的 SIP协议 互相通讯， 对于 SC AS而言， 这是远端 （Remote leg )路径， 在单待业务连 续性发生后， 该远端路径没有变化。
图 2是现有的单待业务连续性架构图， 描述了参与实现单待业务连续性 的网络各相关部分或网元， 以及它们间的接口或连接关系， 描述如下： 相关网元描述：
UE: 具有单待业务连续性能力的用户终端设备； CS网络： 为用户提供传统 CS业务的网络；
PS网络控制网元： 为用户提供 PS业务的网络，其控制网元为 MME (移 动管理实体—— Mobility Management Entity )或 SGSN (服务 GPRS支持节 点 Serving GPRS Support Node ) ； eMSC: 处理 PS网络控制网元发送的切换请求， 执行会话的域间转移， 将 CS切换操作与域间转移操作关联起来等；
IMS网络： 为用户提供 IMS业务的网络。 相关接口描述：
S202: UE和 CS网络间的空中接口 （简称 CS空口） ， 实现 UE和 CS 网络间的信息交互， 如标准的 Um接口； S204: UE和 PS网络控制网元间的空中接口 （简称 PS空口）， 实现 UE 和 PS网络控制网元间的信息交互， 如标准的 Uu接口；
S206: CS网络与 eMSC间的接口 （可以称为 CS信令接口 ) , 根据连接 的具体网元的不同而不同， eMSC与基站子系统间的接口为标准的 Iu-CS接 口， eMSC与其他移动交换中心间的接口为标准的局间信令接口， 即 E接口 和 Nc接口；
S208: PS网络控制网元的控制网元与 eMSC间的信令接口（可以称为域 间切换信令接口） ， 以提供域间切换支持， 该接口为标准的 SV接口；
S210: PS网络控制网元与英特网间的信令接口， 如标准的 SGi接口， 该 接口可以为 UE和英特网间的信息交互提供 IP数据承载，由于 IMS网络^^ 于英特网的， 因此可以算一种特殊的英特网； S212: eMSC与 IMS 网络间的信令路径， 可以是标准的 eMSC与 IMS 网络间的基于 IMS的 SIP协议的 12接口， 也可以是由 eMSC与媒体网关间 的标准 Nc接口及媒体网关与 IMS网络间的标准 Mg接口连接组成； 如果是 后者， 媒体网关会将 Nc接口上的消息翻译成 IMS的 SIP消息或反之； Nc接 口可基于 SIP协议（Nc-SIP ) , 也可基于 ISUP ( ISDN User Protocol, 综合业 务数字网络用户协议）协议（ Nc-ISUP )。 虽然 Nc-SIP和 12接口一样都基于 SIP协议， 但协议只规定了消息的格式， 消息的内容是由应用决定的， 使用 12接口则表明 eMSC支持 IMS相关的应用， 使用 Nc-SIP接口则表明 eMSC 支持传统 CS相关的应用。
图 3是现有的单待业务连续性实现方法流程图，描述了 UE-1和 UE-2间 建立了 IMS会话， 从而建立起 IMS媒体连接路径， 该 IMS媒体连接路径由 UE-1和 PS网络控制网元间的媒体连接及 PS网络控制网元与 UE-2间的媒体 连接组成， UE-1发生单待业务连续性后， UE-1及网络实现让 UE-1使用 CS 域建立媒体连接， 并保持原会话连续的过程， 包括如下步骤： 步骤 301、 UE-1通过与 PS网络控制网元间的 S204接口向为其服务的
PS网络控制网元发送测量报告， 以上报小区信号强度测量信息； 步骤 302、 为 UE-1服务的 PS网络控制网元（原 PS网络控制网元）根 据测量报告中各小区信号强度信息判定附近的 CS网络更适合为 UE-1服务， 于是决定执行切换操作； 步骤 303、 原 PS 网络控制网元中的控制网元， 比如移动性管理实体
( Mobile Management Entity, 简称 MME )或 SGSN, 通过 PS网络控制网元 控制网元与 eMSC间的 S208接口，向 eMSC发送切换请求，比如发送 Handover request (切换请求）消息， 该消息中携带 UE-1的号码信息和 PS网络控制网 元通过归属用户服务器 （ Home Subscriber Server, 简称 HSS )获得的 SC AS 的用于标识业务连续性请求的号码信息； 步骤 304、 eMSC执行标准的 CS切换流程， 以准备目标 CS网络的媒体 链路资源； 步骤 305、完成 CS切换流程后， eMSC通过 S208接口向 PS网络控制网 元发送切换响应消息， 比如发送 Handover response (切换响应） 消息； 步骤 306、 PS网络控制网元收到切换响应消息后，通过 S204接口向 UE-1 发送切换命令消息， 通知 UE-1切换到 CS域； 步骤 307、 UE-1收到切换命令消息后， 将接入方式调整为通过 CS域接 入； 至此 UE-1和 eMSC间建立起了 CS媒体连接路径， 由 UE-1和 CS网络 间的 CS媒体连接及 CS网络和 eMSC间的 CS媒体连接组成。 以下步骤发生在步骤 303之后， 与步骤 304 ~ 307没有顺序关系。 步骤 308、eMSC收到 PS网络控制网元控制网元发送的切换请求消息后， 向 SC AS发送呼叫请求； 上述呼叫请求通过 S212 的信令路径（可以称为互联互通信令路径）发 送， 因此可以是 SIP的 INVITE (邀请 )消息， 也可以是 ISUP的 IAM (初始 地址消息）消息； 该呼叫请求中携带 UE-1的号码信息和 SC AS的号码信息， 其中 SC AS的号码信息作为被叫信息， UE-1的号码信息作为主叫信息。 步骤 309、 SC AS最终会收到由 CSCF转发来的 IMS的 SIP INVITE消息，
SC AS根据被叫信息可判定这是一次业务连续性请求， 再根据主叫信息寻找 到与此次呼叫关联的正在进行的呼叫； 步骤 310、 SC AS在关联的正在进行的呼叫的信令路径上， 通过 CSCF 向 UE-2发送 IMS的更新请求， 比如发送 UPDATE (更新 )或 relNVITE (重 邀请） 消息； 步骤 311、 UE-2收到更新请求后， 回应 IMS的同意更新消息， 比如发送 "200 OK" 消息； 步骤 312、 SC AS收到由 CSCF转发来的同意更新消息后， 通过 S212的 信令路径向 eMSC发送应答呼叫消息， 比如发送 "200 OK" 消息， eMSC最 终收到的可能是 SIP的 "200 OK"消息，也可能是 ISUP的 ANM (应答消息） 消息；
至此， eMSC和 UE-2间建立起新的媒体路径， eMSC将该新建的媒体路 径和 CS媒体路径接起来， 使 UE-1能继续和 UE-2进行通话。
由上可知， 由于设置在归属网络的 SC AS不进行媒体路径的锚定， 因此 釆用现有的单待业务连续性实现方法，在步骤 310 ~ 311中，需要对远端执行 更新操作， 而执行更新操作的 IMS信令的传递时延比较长， 这将导致 CS媒 体建立好后仍需等待较长时间新的媒体路径才能建立好， 从而使通话中断时 间过大。
发明内容 本发明所要解决的技术问题是， 克服现有技术的不足， 提供一种无需对 远端进行更新的单待业务连续性实现方法及单待业务连续性系统。 为了解决上述技术问题， 本发明提供一种单待业务连续性实现方法， 其 包括，所述方法是在用户终端 UE-1通过包交换 PS网络与远端建立了信令锚 定到 IP多媒体子系统控制点 ICP及媒体锚定到 ICP控制的访问网关 AGW的 IP多媒体子系统 IMS会话后实现：
PS网络控制网元向增强移动交换中心 eMSC发送切换请求，请求将所述 IMS会话切换到通过电路交换 CS网络接入； 所述 eMSC接收到所述切换请求后， 为 UE-1准备与所述 eMSC的媒体 链路资源， 并向 ICP发送呼叫请求； ICP控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS会话的远端 媒体链路进行关联。 上述方法还可具有以下特点： eMSC发送的所述呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中， 所述 ICP接收到所述 SIP呼叫请求消息后， 将所述传输 地址 H与所述远端媒体链路的外部接收地址 F进行关联，并将所述新建媒体 链路中用于接收所述 eMSC发送的媒体数据的传输地址 J通过 SIP应答呼叫 发送给所述 eMSC。 上述方法还可具有以下特点： 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中： 所述 ICP接收到所述 SIP呼叫请求消息后， 向访问网关 AGW发送映射 请求， 该请求中携带所述传输地址 H;
AGW将所述传输地址 H与所述远端媒体链路进行关联， 并分配所述传 输地址 J, 将所述传输地址 J通过映射响应发送给 ICP。 上述方法还可具有以下特点： eMSC发送的所述呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中， 所述 ICP接收到所述初始地址消息后， 向所述 eMSC返 回 ISUP的 ANM消息， 该消息中携带所述新建媒体链路中用于在 eMSC端 与远端之间传输 CS媒体的线路资源的线路号 L2。 上述方法还可具有以下特点： 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中： 所述 ICP接收到所述初始地址消息后， 向 AGW发送映射请求， 该请求 中携带所述线路号 LI ; 接收到所述映射请求后， AGW将线路号 L1与所述远端媒体链路进行关 联， 并分配所述线路号 L2, 将所述线路号 L2通过映射响应发送给 ICP。 为了解决上述技术问题， 本发明提供一种单待业务连续性系统， 该系统 包含：包交换 PS网络控制网元、电路交换 CS网络、增强移动交换中心 eMSC、 IP多媒体子系统控制点 ICP和访问网关 AGW; 其中： 所述 PS网络控制网元设置成： 向 eMSC发送切换请求， 请求将 IMS会 话切换到通过所述 CS网络接入； 所述 IMS会话为用户终端 UE-1通过所述 PS 网络与远端建立的信令锚定到 ICP及媒体锚定到 ICP控制的访问网关 AGW的会话； 所述 eMSC设置成：在接收到所述切换请求后，为 UE-1准备与所述 eMSC 的媒体链路资源， 并向 ICP发送呼叫请求； 所述 ICP设置成：控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS 会话的远端媒体链路进行关联。 上述系统还可具有以下特点： 所述 eMSC发送的呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 所述 ICP还设置成： 接收到所述 SIP呼叫请求消息后， 将所述传输地址 H与所述远端媒体链路的外部接收地址 F进行关联， 并将所述新建媒体链路 中用于接收所述 eMSC发送的媒体数据的传输地址 J通过 SIP应答呼叫发送 给所述 eMSC。 上述系统还可具有以下特点： 所述 ICP还设置成： 接收到所述 SIP呼叫请求消息后， 向所述 AGW发 送映射请求， 该请求中携带所述传输地址 H; 所述 AGW设置成： 将所述传输地址 H与所述远端媒体链路进行关联， 上述系统还可具有以下特点： 所述 eMSC发送的呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 所述 ICP还设置成：接收到所述初始地址消息后，向所述 eMSC返回 ISUP 的 ANM消息， 该消息中携带所述新建媒体链路中用于在 eMSC端与远端之 间传输 CS媒体的线路资源的线路号 L2。 上述系统还可具有以下特点： 所述 ICP还设置成： 在接收到所述初始地址消息后向所述 AGW发送映 射请求， 该请求中携带所述线路号 L1 ; 所述 AGW设置成：在接收到所述映射请求后将线路号 L1与所述远端媒 体链路进行关联， 并分配所述线路号 L2, 将所述线路号 L2通过映射响应发 送给 ICP。 为了解决上述技术问题， 本发明提供一种支持单待业务连续性系统的控 制装置， 其包括相连的接收模块和关联模块， 所述接收模块设置成： 接收增强移动交换中心 eMSC发送的呼叫请求， 并告知所述关联模块； 所述关联模块设置成：在用户终端 UE-1通过包交换 PS网络与远端建立 了信令锚定到所述控制装置及媒体锚定到所述控制装置控制的访问网关 AGW的 IP多媒体子系统 IMS会话后， 根据接收到的所述呼叫请求， 控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路进行 关联。 上述控制装置还可具有以下特点： 所述 eMSC发送的呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 所述关联模块还设置成： 将所述传输地址 H与所述远端媒体链路的外部 接收地址 F进行关联， 并将所述新建媒体链路中用于接收所述 eMSC发送的 媒体数据的传输地址 j通过 SIP应答呼叫发送给所述 eMSC。 上述控制装置还可具有以下特点： 所述 eMSC发送的呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 所述关联模块还设置成： 向所述 eMSC返回 ISUP的 ANM消息， 所述 ANM消息中携带所述新建媒体链路中用于在 eMSC端与远端之间传输 CS媒 体的线路资源的线路号 L2。
釆用本发明提出增强单待业务连续性架构及实现方法， 可有效地减少现 有技术中中断时间过长的问题， 大大改善用户体验。
附图概述 图 1是单待业务连续性示意图； 图 2是现有的单待业务连续性架构图； 图 3是现有的单待业务连续性实现方法流程图； 图 4是本发明实施例的增强单待业务连续性架构示意图； 图 5是本发明实施例的增强单待业务连续性流程示意图； 图 6是本发明实施例的增强单待业务连续性架构图 1 ; 图 7 是本发明实施例的基于架构 1 的增强单待业务连续性流程图 1 ( Nc-SIP ) ； 图 8 是本发明实施例的基于架构 1 的增强单待业务连续性流程图 2 ( Nc-ISUP ) ； 图 9是本发明实施例的基于架构图 1的 ICP与 PGW/GGSN合一架构图； 图 10是本发明实施例的基于架构图 1的 ICP与 eMSC合一架构图； 图 11是本发明实施例的基于图 10的增强单待业务连续性流程图； 图 12是本发明实施例的基于架构图 1的 ICP与 AGW合一架构图； 图 13是本发明实施例的基于架构图 1的 ICP、 AGW及 PGW/GGSN合 一架构图；
图 14是本发明实施例的增强单待业务连续性架构图 2; 图 15 是本发明实施例的基于架构 2 的增强单待业务连续性流程图 ( Nc-SIP ) ； 图 16是本发明实施例的基于架构 2的 ICP与 P-CSCF合一架构图； 图 17是本发明实施例的基于架构 2的 ICP与 eMSC合一架构图； 图 18是本发明实施例的基于图 17的增强单待业务连续性流程图； 图 19是本发明实施例的基于架构图 2的 ICP与 SC AS合一架构图； 图 20是本发明实施例的基于图 19的增强单待业务连续性流程图。
本发明的较佳实施方式
本发明的核心思想是， 引入扩展网元锚定信令和媒体（或在现有的网元 上增加相应的功能） ， 当单待业务连续性发生后， 将信令发送至扩展网元， 扩展网元通过关联会话将信令终结不再继续传递， 并更新原会话媒体路径的 近端， 保持远端不变。 下面将结合附图和实施例对本发明进行详细描述。 图 4是本发明实施例的增强单待业务连续性架构示意图， 图 4中描述了 实现增强单待业务连续性的网络各相关部分或网元， 以及它们之间的接口或 连接关系， 具体描述如下： 相关网元描述： 标准 SRVCC架构部分： 除不包含 IMS网络外，与图 2中的各网元相同； 扩展部分包含如下网元：
ICP( IMS Control Point , IMS控制点）：用于控制 AGW( Access Gate Way, 访问网关 )分配资源， 映射或关联媒体路径； AGW: 用于处理媒体数据的转发；
IMS网元： 即 IMS网络的各标准网元。 根据实施例的不同， ICP和 AGW可以是 IMS网络的一部分， 也可以不 疋。 相关接口描述： S402 - S410: 与图 2中的 S202 ~ S210相同， 由于扩展部分都是基于英 特网的， 因此 S410接口并不与哪个具体网元连接；
S412: UE和扩展部分的 IMS信令接口， 该接口为逻辑接口， 用于传递 UE和扩展部分交互的 IMS信令； 该接口具体与扩展部分的哪个网元相连视 具体的实施例而定， 如果 ICP和 AGW是 IMS网络的一部分， 则该接口可以 不显示和表述， 因为属于标准连法；
S414: 与图 2中的 S212相同；
S416: ICP和 AGW间的信令接口， ICP使用该接口控制 AGW分配资源， 映射或关联媒体路径；
S418: ICP和 IMS网元间的信令接口，用于传递 UE与 P-CSCF间的 IMS 协议消息， 或 P-CSCF与 I-CSCF/S-CSCF间的 IMS协议消息， 或 CSCF与 SC AS间的 IMS协议消息， 具体根据 ICP所在位置而定；
图 5是本发明实施例的增强单待业务连续性流程示意图， 描述了 UE-1 和 UE-2间建立 IMS会话的过程， 并且在 IMS会话建立完成后， UE-1发生 单待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连接， 并保持原会话连续的过程， 包括如下步骤： 步骤 501 ~ 502、 UE-1发起 IMS呼叫请求， 比如发送 INVITE消息， 该 呼叫请求实际由 S404及 S410接口传递， 承载于 PS网络控制网元建立的 IP 承载之上， 因此会经过 PS网络控制网元； 该呼叫请求中携带了 UE-1用于接 收媒体数据的传输地址信息， 表示为 B; 该呼叫请求被路由至 ICP, 路由过 程可能经过 IMS网络的某些网元， 也可能不经过， 视具体实施例而定； 步骤 503、 ICP通过 S416接口向 AGW请求分配地址资源， 比如发送分 配请求消息， 该消息中携带传输地址信息 B; 步骤 504、 AGW分配端口资源 C和 F, 其中端口 F用于接收远端发送的 媒体数据， 并建立其与传输地址信息 B的关联关系， 使得从端口 F收到的媒 体数据都需要转发给传输地址 B, 端口 C用于转发端口 F收到的媒体数据； 然后 AGW通过 S416接口向 ICP表示同意分配， 比如发送分配响应消息，该 消息中携带端口 F的信息； 为了简化描述， 端口 F对应的传输地址信息仍旧 表示为 F , 传输地址包括 IP地址和端口。 如果 UE-1欲建立的呼叫包括不止一种媒体， 则 B包含多个接收媒体数 据的传输地址信息， 步骤 503可以是一个消息， 携带多个接收媒体数据的传 输地址信息， 也可以是多个消息， 分别携带一个接收媒体数据的传输地址信 息； 相应地， 步骤 504也可以是一个携带多个端口信息的消息， 或多个分别 携带一个端口信息的消息， 具体实现方法不影响本发明的实质。 步骤 505、 ICP使用传输地址 F替换步骤 502中的 IMS呼叫请求的传输 地址 B, 然后向远端转发 IMS呼叫请求； 步骤 506、 远端接收到 IMS呼叫请求后， 发送 IMS应答呼叫， 比如发送 "200 OK" 消息， 该消息中携带远端用于接收媒体数据的传输地址信息， 表 示为 X； 步骤 507、 ICP收到 IMS应答呼叫后， 通过 S416接口向 AGW请求分配 地址资源， 比如发送分配请求消息， 该消息中携带传输地址信息 X； 步骤 508、 AGW分配端口资源 D和 E, 其中端口 D用于接收 UE-1发送 的媒体数据， 并建立其与传输地址 X的关联关系，使得端口 D收到的媒体数 据都需要转发给传输地址 X, 端口 E用于转发端口 D收到的媒体数据； 然后 AGW通过 S416接口向 ICP表示同意分配， 比如发送分配响应消息， 消息中 携带端口 D的信息，为简化描述，端口 D对应的传输地址信息仍旧表示为 D。 如果 X包含多个接收媒体数据的传输地址信息， 步骤 507可以是一个消 息， 携带多个接收媒体数据的传输地址信息， 也可以是多个消息， 分别携带 一个接收媒体数据的传输地址信息； 相应地， 步骤 508也可以是一个携带多 个端口信息的消息， 或多个分别携带一个端口信息的消息， 具体实现方法不 影响本发明的实质。 步骤 509 ~ 510、 ICP使用传输地址 D替换步骤 506中的 IMS应答呼叫 中的传输地址 X,然后向 UE-1转发 IMS应答呼叫；该消息可能经过某些 IMS 网元， 也可能不经过， 视具体实施例而定； 该消息实际是通过承载于 PS 网 络控制网元建立的 IP承载之上传给 UE- 1 , 因此会经过 PS网络控制网元； 至此， UE-1和远端建立了 IMS媒体连接， 其中包括 UE-1与 AGW间的 IMS媒体连接 1 (简称 IMS媒体 1 )和 AGW与远端间的 IMS媒体连接 2 (简 称 IMS媒体 2 ) 。 以下为 UE- 1发生域间切换时的步骤描述。 步骤 51 1 ~ 517、 与图 3中的步骤 301 ~ 307相同； 步骤 518、 eMSC收到 PS网络控制网元控制网元的切换请求消息后， 向 ICP发送呼叫请求， 该请求通过 S414的信令路径发送， 因此可以是 SIP的 INVITE (邀请）消息， 也可以是 ISUP的 IAM (初始地址消息） 消息； 该呼 叫请求中会携带 UE-1的号码信息和 ICP的号码信息或标识信息， 其中 ICP 的号码信息或标识信息作为被叫信息， UE-1的号码信息作为主叫信息； 本步骤及以下步骤发生在步骤 513之后 ,与步骤 514 ~ 517没有顺序关系。 步骤 519、 ICP判断 518的呼叫请求为 502的会话的切换请求（呼叫的 目标是 ICP的号码信息或标识信息， 可以通过呼叫的主叫信息关联步骤 502 的会话） ， 请求 AGW执行映射操作， 使新建媒体与原 IMS媒体 2互联， 具 体的实现方式随架构的不同而不同； 步骤 520、 映射操作完成后， ICP通过 S414的信令路径向 eMSC发送应 答呼叫消息， eMSC最终收到的可能是 SIP的 "200 OK"消息，也可能是 ISUP 的 ANM消息 , 视具体连接方式而定； 至此， eMSC和 AGW间建立起新的媒体路径， eMSC将该新建媒体路径 和 CS媒体路径接起来， AGW将该新建媒体路径和 IMS媒体连接 2连接起 来， 使 UE-1能继续和 UE-2进行通话。 本发明实施例的支持单待业务连续性系统的控制装置 （即本发明中的 ICP ) ， 其包括相连的接收模块和关联模块， 所述接收模块设置成： 接收增强移动交换中心 eMSC发送的呼叫请求， 并告知所述关联模块； 所述关联模块设置成：在用户终端 UE-1通过包交换 PS网络与远端建立 了信令锚定到所述控制装置及媒体锚定到所述控制装置控制的访问网关 AGW的 IP多媒体子系统 IMS会话后， 根据接收到的所述呼叫请求， 控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路进行 关联。 当所述 eMSC发送的呼叫请求为初始会话协议 SIP呼叫请求消息； 该消 息中携带所述 eMSC新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 所述关联模块还设置成： 将所述传输地址 H与所述远端媒体链路的外部 接收地址 F进行关联， 并将所述新建媒体链路中用于接收所述 eMSC发送的 媒体数据的传输地址 j通过 SIP应答呼叫发送给所述 eMSC。 当所述 eMSC发送的呼叫请求为综合业务数字网络用户协议 ISUP的初 始地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线 路资源的线路号 L1 ; 所述关联模块还设置成： 向所述 eMSC返回 ISUP的 ANM消息，所述 ANM消息中携带所述新建媒体链路中用于在 eMSC端与远 端之间传输 CS媒体的线路资源的线路号 L2。
为简化描述， 以下的实施例中不再显示和表述 S410对应的接口信息， 这并不影响对本发明的完整描述， 因为该接口是表示 IP连接关系的， 而 IMS 网络以及本发明的扩展部分整个就是基于 IP之上的业务网络。 第一架构实施例
图 6是本发明实施例的增强单待业务连续性架构图 1 , 描述了实现增强 单待业务连续性的网络各相关部分或网元， 以及它们间的接口或连接关系， 具体描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同；
ICP: 控制 AGW分配资源， 映射或关联媒体路径；
AGW: 用于实现 IP媒体数据的转发或 CS媒体数据与 IP媒体数据之间 的转发； 相关接口描述：
S602 - S608: 与图 4中的 S402 ~ S408相同；
S612: UE和 ICP间的 IMS信令接口，用于通过 ICP传递 UE和 P-CSCF 间的 IMS信令 , 比如可以为 IMS标准的 Gm接口； S614: eMSC和 ICP间的信令接口， 用于传递 eMSC与 ICP建链过程中 的消息， 比如标准的 Nc接口， 该接口可以是基于 SIP的 Nc-SIP接口， 也可 以是基于 ISUP的 Nc-ISUP接口；
S616: ICP和 AGW间的信令接口， 使 ICP控制 AGW分配资源， 映射 或关联媒体路径； S618: ICP和 IMS网元间的信令接口，用于通过 ICP传递 UE与 P-CSCF 间的 IMS协议消息 , 比如可以为 IMS标准的 Gm接口；
第一流程实施例 图 7 是本发明实施例的基于架构 1 的增强单待业务连续性流程图 1 ( Nc-SIP ) ； 图 7描述了 UE-1和 UE-2间的 IMS会话建立完成后， UE-1发 生单待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连接， 并保持原会话连续的过程， 其中 eMSC和 ICP间使用 Nc-SIP接口， 包括如 下步骤：
步骤 701、 与图 5的步骤 501 ~ 510相似； 其中， UE和 ICP间的 IMS消 息传递不经过任何标准 IMS网元， UE-1和远端建立了 IMS媒体连接， 其中 包括 UE-1与 AGW间的 IMS媒体连接 1和 AGW与远端间的 IMS媒体连接
2。 步骤 702、 与图 5中的步骤 511 ~ 517相同； 步骤 703、 eMSC收到 PS网络控制网元控制员网元的切换请求消息后， 向 ICP发送呼叫请求， 该请求通过 S614的信令路径发送， 此实施例中 S614 接口使用 Nc-SIP接口， 因此发送的是 SIP的 INVITE (邀请 ) 消息， 呼叫请 求中会携带 UE-1的号码信息和 ICP的号码信息或标识信息， 其中 ICP的号 码信息或标识信息作为被叫信息， UE-1的号码信息作为主叫信息， 并且该消 息中携带 eMSC的用于接收媒体数据的传输地址 H; 本步骤可以在步骤 702没完成前执行， 具体参见步骤 518的相关描述。 步骤 704、 ICP判断 703的呼叫请求为步骤 701的会话的切换请求， 请 求 AGW执行映射操作， 比如发送 Map request (映射请求） 消息， 该消息中 携带 eMSC的传输地址 H和原 IMS媒体连接 2的传输地址 F, 或原 IMS媒 体连接 1的传输地址 D; 步骤 705、 AGW执行映射操作， 将新建媒体连接与原 IMS媒体连接 2 连接起来， 并分配新的近端媒体数据接收端口 J, 为简化描述， 端口 J对应 的传输地址信息仍旧表示为 J,映射操作完成后， AGW通过 S616接口向 ICP 发送映射响应消息， 比如发送 Map response (映射响应） 消息， 该消息中携 带 AGW用于接收媒体数据的传输地址 J; 步骤 706、 ICP收到映射响应后， 通过 S614接口向 eMSC发送 Nc-SIP 的应答消息， 比如发送 "200 OK" 消息， 该消息中携带获得的 AGW的媒体 资源信息； 至此， eMSC和 AGW间建立起新的媒体路径， eMSC将该新建媒体路径 和 CS媒体路径接起来， AGW将该新建媒体路径和 IMS媒体连接 2连接起 来， 使 UE-1能继续和 UE-2进行通话。
第二流程实施例 图 8 是本发明实施例的基于架构 1 的增强单待业务连续性流程图 2
( Nc-ISUP ) ； 图 8描述了 UE-1和 UE-2间的 IMS会话建立完成后， UE-1 发生单待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连 接， 并保持原会话连续的过程， 其中 eMSC和 ICP间使用 Nc-ISUP接口， 包 括如下步骤： 步骤 801 ~ 802、 与图 7的步骤 701 ~ 702相同； 步骤 803、 eMSC收到 PS网络控制网元控制网元的切换请求消息后， 向 ICP发送呼叫请求， 该请求通过 S614的信令路径发送， 此实施例中 S614接 口使用 Nc-ISUP接口， 因此发送的是 ISUP的 IAM消息， 携带 eMSC用于传 输 CS媒体的线路资源的线路号 L1 , 该呼叫请求中携带 UE-1的号码信息和 ICP的号码信息， 其中 ICP的号码信息作为被叫信息， UE-1的号码信息作为 主叫信息； 本步骤可在步骤 802没完成前执行， 具体参见步骤 518的相关描述。 步骤 804、 ICP判断 803的呼叫请求为 801的会话的切换请求， 可选的， ICP请求 AGW执行线路分配操作， 比如发送 Line Alloc request (线路分配请 求） 消息， 该消息中携带获得的线路号 L1 , 该消息通过 S616接口传送； 步骤 805、 AGW收到线路分配请求后， 分配好用于传输 CS媒体的线路 资源， 其对应的线路号为 L2, 然后通过 S616接口发送线路分配响应给 ICP, 比如发送 Line Alloc response (线路分配响应）消息， 该消息中携带分配的线 路号 L2; 步骤 806、 ICP请求 AGW执行映射操作， 比如发送 Map request (映射 请求） 消息， 该消息中携带获得的线路号 L1 ; 如果执行了步骤 804 ~ 805 , 该消息中也可携带获得的线路号 L2,该消息中同时还携带原 IMS媒体连接 2 的传输地址 F, 或原 IMS媒体连接 1的传输地址 D; 步骤 807、 AGW执行映射操作， 将新建媒体连接与原 IMS媒体连接 2 连接起来， 如果没有执行步骤 804 ~ 805 , 由于映射操作携带了线路号信息， 因此 AGW分配新的用于传输 CS媒体数据的线路资源， 相应的线路号设为 L2； 如果执行了步骤 804 - 805 , 则线路资源已分配， AGW通过 S616接口 向 ICP发送映射响应消息， 比如发送 Map response (映射响应） 消息， 如果 执行了 804 ~ 805 , 该消息中可不携带线路号信息， 如果没有执行， 则该消息 中携带新分配的线路号 L2的信息； 步骤 808、 ICP收到映射响应， 通过 S614接口向 eMSC发送 Nc-ISUP的 应答消息， 比如发送 ANM消息，该消息中携带获得的 AGW的传输 CS媒体 数据的线路信息； 至此 eMSC和 AGW间建立起新的 CS媒体路径， eMSC将该新建媒体路 径和 UE与 eMSC间的 CS媒体路径接起来， AGW将该新建 CS媒体路径和 IMS媒体连接 2连接起来， 使 UE-1能继续和 UE-2进行通话。
第二架构实施例 图 9是本发明实施例的基于架构 1的 ICP与 PGW/GGSN合一架构图， 描述了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以 及它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 除 PS 网络控制网元有所不同外， 其他与图 4 各网元相同；
PGW/GGSN: PS网络控制网元与英特网相连的网元， 属于 PS网络控制 网元的网元， 称为分组数据网络网关（ Packet Data Network Gate Way ) /全局 GPRS支持节点 （Global GPRS Support Node ) , 处理 PS网络控制网元 IP 网络的交互，该网元新增 IMS控制点（ IMS Control Point )功能，控制 AGW 分配资源， 映射或关联媒体路径； AGW: 访问网关（ Access Gate Way ) , 实现 IP媒体数据的转发或 CS媒 体数据与 IP媒体数据之间的转发； 相关接口描述：
S902 - S908: 与图 4中的 S402 ~ S408相同； S912: UE和 PGW或 GGSN间的 IMS信令接口， 用于通过 PGW/GGSN 传递 UE和 P-CSCF间的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S914 : eMSC 和 PGW/GGSN 间的信令接口， 用于传递 eMSC 与 PGW/GGSN建链过程中的消息， 比如标准的 Nc接口， 可以是基于 SIP的 ( Nc-SIP ) , 也可以是基于 ISUP的 （Nc-ISUP ) ； S916: PGW/GGSN和 AGW间的信令接口， 使 PGW/GGSN控制 AGW 分配资源， 映射或关联媒体路径；
S918: PGW/GGSN和 IMS 网元间的信令接口， 用于通过 PGW/GGSN 传递 UE与 P-CSCF间的 IMS协议消息， 比如可以为 IMS标准的 Gm接口； 该架构下的流程实施例与图 7和图 8十分相似， 只需将图中的 ICP改为 PGW/GGSN即可， 因此不赘述。
第三架构实施例 图 10是本发明实施例的基于架构图 1的 ICP与 eMSC合一架构图， 描 述了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以及 它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 除 eMSC有所不同外， 其他与图 4各网元相同； eMSC: 增强移动交换中心， 处理 PS网络控制网元发送的切换请求， 执 行会话的域间转移， 将 CS切换操作与域间转移操作关联起来等， 该网元新 增 IMS控制点 （ IMS Control Point )功能， 控制 AGW分配资源， 映射或关 联媒体路径； AGW: 访问网关（ Access Gate Way ) , 实现 CS媒体数据与 IP媒体数据 之间的转发； 相关接口描述：
S1002 - S1008: 与图 4中的 S402 ~ S408相同; S1012: UE和 eMSC间的 IMS信令接口， 用于通过 eMSC传递 UE和
P-CSCF间的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S1016: eMSC和 AGW间的信令接口， 使 eMSC控制 AGW分配资源， 映射或关联媒体路径；
S1018: eMSC和 IMS网元间的信令接口， 用于通过 eMSC传递 UE与 P-CSCF间的 IMS协议消息， 比如可以为 IMS标准的 Gm接口；
第三流程实施例 图 11是本发明实施例的基于图 10的增强单待业务连续性流程图， 描述 了 UE-1和 UE-2间建立 IMS会话的过程，并且在 IMS会话建立完成后， UE-1 发生单待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连 接， 并保持原会话连续的过程， 其中 UE-1 切换到的目标小区不属于 eMSC 管理， 而属于另一个 MSC管理， 包括如下步骤： 步骤 1101、 UE-1发起 IMS呼叫请求， 比如发送 INVITE消息， 该请求 消息承载于由 PS 网络控制网元提供的 IP承载之上， 该呼叫请求中携带了 UE-1用于接收媒体数据的传输地址信息， 表示为 B, 消息被路由至 eMSC, 路由过程不经过 IMS网络的任何网元； 步骤 1102、 eMSC通过 S1016接口向 AGW请求分配地址资源， 比如发 送分配请求消息， 消息中携带 B传输地址信息； 步骤 1103、 AGW分配端口资源 C和 F , 其中端口 F用于接收远端发送 的媒体数据， 并建立关联关系， 使得端口 F收到的媒体数据都需要转发给传 输地址 B, 端口 C就是用来转发端口 F收到的媒体数据的， 然后通过 S1016 接口向 eMSC表示同意分配， 比如发送分配响应消息， 消息中携带端口 F的 信息， 为简化描述， 端口 F对应的传输地址信息仍旧表示为 F, 传输地址包 括 IP地址和端口； 如果 UE-1欲建立的呼叫包括不止一种媒体， 则 B包含多个接收媒体数 据的传输地址信息，步骤 1102可以是一个消息，携带多个接收媒体数据的传 输地址信息， 也可以是多个消息， 分别携带一个接收媒体数据的传输地址信 息，相应的步骤 1103也是一个消息携带多个端口信息，或多个消息分别携带 一个端口信息， 具体实现方法不影响本发明的实质。 步骤 1104、 eMSC使用传输地址 F替换步骤 1101 中的传输地址 B, 然 后转发 IMS呼叫请求消息； 步骤 1105、 远端接收到 IMS呼叫请求消息后， 发送 IMS应答呼叫消息， 比如发送 "200 OK" 消息， 消息携带了远端用于接收媒体数据的传输地址信 息， 表示为 X, 步骤 1106、 eMSC收到 IMS应答呼叫消息， 通过 S 1016接口向 AGW请 求分配地址资源， 比如发送分配请求消息， 消息中携带 X传输地址信息； 步骤 1107、 AGW分配端口资源 D和 E, 其中端口 D用于接收 UE-1发 送的媒体数据， 并建立关联关系， 使得端口 D收到的媒体数据都需要转发给 传输地址 X,端口 E就是用来转发端口 D收到的媒体数据的，然后通过 S1016 接口向 eMSC表示同意分配， 比如发送分配响应消息， 消息中携带端口 D的 信息， 为简化描述， 端口 D对应的传输地址信息仍旧表示为 D; 如果 X包含多个接收媒体数据的传输地址信息， 步骤 1106可以是一个 消息， 携带多个接收媒体数据的传输地址信息， 也可以是多个消息， 分别携 带一个接收媒体数据的传输地址信息，相应的步骤 1107也是一个消息携带多 个端口信息， 或多个消息分别携带一个端口信息， 具体实现方法不影响本发 明的实质。 步骤 1108、 eMSC使用传输地址 D替换步骤 1105中的传输地址 X, 然 后转发 IMS应答呼叫消息， 消息不经过任何 IMS网元， 该消息传给 UE实际 是承载于 PS网络控制网元建立的 IP承载之上； 至此， UE-1和远端建立了 IMS媒体连接， 其中包括 UE-1与 AGW间的 IMS媒体连接 1和 AGW与远端间的 IMS媒体连接 2。 以下步骤为 UE- 1发生域间切换时的描述。 步骤 1109 ~ 1111、 与图 5中的步骤 511 - 513相同； 步骤 1112、eMSC按标准的 CS切换流程准备目标 CS网络的媒体链路资 源， 由于目标小区属于不同的 MSC, 因此 eMSC向目标 MSC发送切换请求， 比如发送 Handover Request (切换请求） 消息； 步骤 1113、 目标 MSC回应切换响应消息， 比如 Handover response (切 换响应） 消息， 携带局间切换号码； 步骤 1114、 eMSC通过 S1016接口向 AGW请求分配 CS媒体的线路资 源， 比 ¾口发送 Line Alloc request; 步骤 1115、 AGW收到线路资源分配请求， 分配传输 CS媒体的线路资 源， 然后回应分配的线路号 L1 , 比如发送 Line Alloc response消息， 携带线 路号 L1的信息； 步骤 1116、 eMSC向目标 MSC发送建链请求， 比如发送 IAM消息， 携 带获得的线路号 L1的信息； 步骤 1117、目标 MSC按标准 CS局间切换过程为 UE-1准备好无线资源； 步骤 1118、 目标 MSC返回建链响应， 比如发送 ANM消息， 携带目标 MSC用于与 eMSC相互传输 CS媒体数据的线路资源的线路号 L2的信息； 步骤 1119、 eMSC请求 AGW执行映射操作， 比如发送 Map request (映 射请求） 消息， 携带获得的线路号 L1或 L2, 同时还携带原 IMS媒体连接 2 的传输地址 F, 或原 IMS媒体连接 1的传输地址 D; 步骤 1120、 AGW执行映射操作， 将新建媒体连接与原 IMS媒体连接 2 连接起来， AGW通过 S1016接口向 eMSC发送映射响应消息，比如发送 Map response (映射响应 ) 消息； 步骤 1121、 eMSC收到映射响应， 通过 S1008接口向原 PS网络控制网 元发送切换响应消息， 比如发送 Handover response消息； 步骤 1122、 PS网络控制网元收到切换响应消息后， 通过 S1004接口向 UE-1发送切换命令消息， 比如发送 Handover Command (切换命令 ) 消息， 通知 UE-1切换到 CS域； 步骤 1123、 UE-1收到切换命令， 调整接入方式为接入 CS域； 至此 UE-1和 AGW间建立起来了 CS媒体连接路径， 由 UE-1和 CS网 络， CS网络与目标 MSC, 以及目标 MSC和 AGW间的 CS媒体连接组成， 再通过 AGW的连接作用， 将新建 CS媒体与原 IMS媒体连接 2连接起来， 使 UE-1能继续和 UE-2进行通话。
第四架构实施例 图 12是本发明实施例的基于架构图 1的 ICP与 AGW合一架构图，描述 了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以及它 们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同；
IACP: IMS访问与控制点 （IMS Access and Control Point )功能， 实现 分配资源， 映射或关联媒体路径， IP媒体数据的转发或 CS媒体数据与 IP媒 体数据之间的转发； 相关接口描述： S1202 - S1208: 与图 4中的 S402 ~ S408相同；
S1212: UE和 IACP间的 IMS信令接口， 用于通过 IACP传递 UE和 P-CSCF间的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S1214: eMSC和 IACP间的信令接口， 用于传递 eMSC与 IACP建链过 程中的消息， 比如标准的 Nc接口， 可以是基于 SIP的 （Nc-SIP ) , 也可以 ^^于 ISUP的 （ Nc-ISUP ) ；
S1218: IACP和 IMS 网元间的信令接口， 用于通过 IACP传递 UE与 P-CSCF间的 IMS协议消息 , 比如可以为 IMS标准的 Gm接口； 该架构下的流程实施例与图 7和图 8十分相似， 只需将图中的 ICP和 AGW合一为 IACP, 其间的消息流程变为内部过程， 因此不赘述。
第五架构实施例 图 13是本发明实施例的基于架构图 1的 ICP、 AGW及 PGW/GGSN合 一架构图， 描述了为实现增强单待业务连续性， 参与实现的网络各相关部分 或网元， 以及它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同；
PGW/GGSN: PS网络控制网元与英特网相连的网元， 属于 PS网络控制 网元的网元， 称为分组数据网络网关 （ Packet Data Network Gate Way ) /全局 GPRS支持节点 （ Global GPRS Support Node ) , 处理 PS网络控制网元 IP网 络的交互， 该网元新增 IMS访问与控制点（ IMS Access and Control Point )功 能， 实现分配资源， 映射或关联媒体路径， IP媒体数据的转发或 CS媒体数 据与 IP媒体数据之间的转发； 相关接口描述：
S1302 - S1308: 与图 4中的 S402 ~ S408相同；
S1312: UE和 PGW/GGSN间的 IMS信令接口， 用于通过 PGW/GGSN 传递 UE和 P-CSCF间的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S1314 : eMSC 和 PGW/GGSN 间的信令接口， 用于传递 eMSC 与 PGW/GGSN建链过程中的消息， 比如标准的 Nc接口， 可以是基于 SIP的 ( Nc-SIP ) , 也可以是基于 ISUP的 （Nc-ISUP ) ；
S1318: PGW/GGSN和 IMS网元间的信令接口， 用于通过 PGW/GGSN 传递 UE与 P-CSCF间的 IMS协议消息， 比如可以为 IMS标准的 Gm接口； 该架构下的流程实施例与图 7和图 8十分相似， 只需将图中的 ICP改为 PGW/GGSN, 并与 AGW合一，其间的消息流程变为内部过程， 因此不赘述。
第六架构实施例 图 14是本发明实施例的增强单待业务连续性架构图 2,描述了为实现增 强单待业务连续性， 参与实现的网络各相关部分或网元， 以及它们间的接口 或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同；
ICP: IMS控制点 （ IMS Control Point ) , 控制 AGW分配资源， 映射或 关联媒体路径；
AGW: 访问网关（ Access Gate Way ) , 实现 IP媒体数据的转发或 CS媒 体数据与 IP媒体数据之间的转发； 相关接口描述：
S1402 - S1408: 与图 4中的 S402 ~ S408相同; S1412: UE和 P-CSCF间的 IMS信令接口， 用于传递 UE和 P-CSCF间 的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S1414: eMSC和 ICP间的信令接口， 用于传递 eMSC与 ICP建链过程 中的消息， 比如标准的 Nc接口， 可以是基于 SIP的 （Nc-SIP ) , 也可以是 基于 ISUP的 （Nc-ISUP ) ； S1416: ICP和 AGW间的信令接口， 使 ICP控制 AGW分配资源， 映射 或关联媒体路径；
S1418: ICP和 IMS的 I-CSCF或 S-CSCF间的信令接口， 用于通过 ICP 传递 P-CSCF与 I-CSCF或 S-CSCF间的 IMS协议消息， 比如可以为 IMS标 准的 Mw接口； S1420: ICP和 P-CSCF间的信令接口， 用于通过 ICP传递 P-CSCF与
I-CSCF或 S-CSCF间的 IMS协议消息， 比如可以为 IMS标准的 Mw接口； S1418和 S1420—起组成了图 4中的 S418接口。
第四流程实施例 图 15 是本发明实施例的基于架构 2 的增强单待业务连续性流程图 ( Nc-SIP ) , 描述了 UE-1和 UE-2间的 IMS会话建立完成后， UE-1发生单 待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连接， 并 保持原会话连续的过程， 其中 eMSC和 ICP间使用 Nc-SIP接口， 包括如下 步骤： 步骤 1501、 与图 5的步骤 501 ~ 510相似， 只是 UE和 ICP间的 IMS消 息传递经过标准 IMS的 P-CSCF网元， UE-1和远端建立了 IMS媒体连接， 其中包括 UE-1与 AGW间的 IMS媒体连接 1和 AGW与远端间的 IMS媒体 连接 2。 步骤 1502、 与图 5中的步骤 511 ~ 517相同； 步骤 1503、 eMSC收到 PS网络控制网元的切换请求消息后， 向 ICP发 送呼叫请求， 该请求通过 S1414的信令路径发送， 此实施例中 S1414接口使 用 Nc-SIP接口， 因此发送的是 SIP的 INVITE (邀请） 消息， 呼叫请求中会 携带 UE-1的号码信息和 ICP的号码信息， 其中 ICP的号码信息作为被叫信 息， UE-1的号码信息作为主叫信息，并且消息中携带 eMSC的接收媒体数据 的传输地址 H; 该步骤可在步骤 1502没完成前执行， 具体参见步骤 518的相关描述。 步骤 1504、 ICP判断 1503的呼叫请求为 1501的会话的切换请求， 请求 AGW执行映射操作， 比如发送 Map request (映射请求） 消息， 携带 eMSC 的传输地址 H和原 IMS媒体连接 2的传输地址 F, 或原 IMS媒体连接 1的 传输地址 D; 步骤 1505、 AGW执行映射操作， 将新建媒体连接与原 IMS媒体连接 2 连接起来， 并分配新的近端媒体数据接收端口 J, 为简化描述， 端口 J对应 的传输地址信息仍旧表示为 J,映射操作完成后， AGW通过 S1416接口向 ICP 发送映射响应消息 ,比如发送 Map response (映射响应）消息 ,消息携带 AGW 接收媒体数据的传输地址 J; 步骤 1506、 ICP收到映射响应， 通过 S1414接口向 eMSC发送 Nc-SIP 的应答消息， 比如发送 " 200 OK" 消息， 消息携带获得的 AGW的媒体资源 信息； 至此 eMSC和 AGW间建立起新的 IMS媒体路径， eMSC将该新建媒体 路径和 CS媒体路径接起来， AGW将该新建媒体路径和 IMS媒体连接 2连 接起来， 使 UE- 1能继续和 UE-2进行通话。 该架构下的 eMSC和 ICP间使用 Nc-ISUP接口的流程实施例其 IMS通 话建立过程与图 15的 1501描述相同， 切换过程与图 8相同， 因此不赘述。
第七架构实施例 图 16是本发明实施例的基于架构图 2的 ICP与 P-CSCF合一架构图，描 述了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以及 它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同； P-CSCF: 代理 CSCF, 标准 P-CSCF增加信令路径锚定的功能； AGW: 访问网关 （ Access GateWay ) , 实现媒体路径锚定的功能； 相关接口描述：
S1602 - S1608: 与图 4中的 S402 ~ S408相同； 由于 P-CSCF为 IMS网络网元， 因此 UE与 IMS网络间的信令接口没有 显示与描述， 其为 IMS标准接口。
S1614: eMSC和 P-CSCF间的信令接口， 用于传递 eMSC与 ICP建链过 程中的消息， 比如标准的 Nc接口， 可以是基于 SIP的 （Nc-SIP ) , 也可以 ^^于 ISUP的 （ Nc-ISUP ) ； S1616: P-CSCF和 AGW间的信令接口， 使 P-CSCF控制 AGW分配资 源， 映射或关联媒体路径； 该架构下的流程实施例与图 15十分相似， 只需将图中的 ICP和 P-CSCF 合一， 因此不赘述。
第八架构实施例 图 17是本发明实施例的基于架构图 2的 ICP与 eMSC合一架构图， 描 述了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以及 它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 除 eMSC有所不同外， 其他与图 4各网元相同； eMSC: 增强移动交换中心， 处理 PS网络控制网元发送的切换请求， 执 行会话的域间转移， 将 CS切换操作与域间转移操作关联起来等， 该网元新 增 IMS控制点 （ IMS Control Point )功能， 控制 AGW分配资源， 映射或关 联媒体路径；
AGW: 访问网关（ Access Gate Way ) , 实现 CS媒体数据与 IP媒体数据 之间的转发； 相关接口描述：
S1702 - S1708: 与图 4中的 S402 ~ S408相同; S1712: UE和 P-CSCF间的 IMS信令接口， 用于传递 UE和 P-CSCF间 的 IMS信令， 比如可以为 IMS标准的 Gm接口；
S1716: eMSC和 AGW间的信令接口， 使 eMSC控制 AGW分配资源， 映射或关联媒体路径；
S1718: eMSC和 IMS的 I-CSCF或 S-CSCF间的信令接口，用于通过 eMSC 传递 P-CSCF与 I-CSCF或 S-CSCF间的 IMS协议消息， 比如可以为 IMS标 准的 Mw接口； S1720: eMSC和 P-CSCF间的信令接口， 用于通过 eMSC传递 P-CSCF 与 I-CSCF或 S-CSCF间的 IMS协议消息，比如可以为 IMS标准的 Mw接口；
S1718和 S1720—起组成了图 4中的 S418接口。
第五流程实施例 图 18是本发明实施例的基于图 17的增强单待业务连续性流程图， 描述 了 UE-1和 UE-2间建立 IMS会话的过程，并且在 IMS会话建立完成后， UE-1 发生单待业务连续性， UE-1及网络如何实现让 UE-1使用 CS域建立媒体连 接， 并保持原会话连续的过程， 其中 UE-1切换到的目标小区属于 eMSC管 理， 包括如下步骤： 步骤 1801、 UE-1发起 IMS呼叫请求， 比如发送 INVITE消息， 该请求 消息承载于由 PS 网络控制网元提供的 IP承载之上， 该呼叫请求中携带了 UE-1用于接收媒体数据的传输地址信息，表示为 B, 消息被路由至 P-CSCF; 步骤 1802、 P-CSCF转发呼叫请求， 转发的消息到达 eMSC; 步骤 1803 ~ 1808、 与图 11的步骤 1102 ~ 1107相同； 步骤 1809、 eMSC使用传输地址 D替换步骤 1806中的传输地址 X, 然 后转发 IMS应答呼叫消息， 消息经过 P-CSCF; 步骤 1810、 P-CSCF转发该消息给 UE, 转发消息实际是承载于 PS网络 控制网元建立的 IP 载之上； 至此， UE-1和远端建立了 IMS媒体连接， 其中包括 UE-1与 AGW间的
IMS媒体连接 1和 AGW与远端间的 IMS媒体连接 2。
以下步骤为 UE- 1发生域间切换时的描述。 步骤 1811 ~ 1814、 与图 5 中的步骤 511 ~ 514相同， 其中准备好的 CS 媒体资源在 AGW上以线路号 L1标识； 步骤 1815 ~ 1818、 与图 8的步骤 804 ~ 807相同； 步骤 1819、 eMSC收到映射响应， 通过 S1708接口向原 PS网络控制网 元发送切换响应消息 , 比如发送 Handover response消息； 步骤 1820、 PS网络控制网元收到切换响应消息后， 通过 S1704接口向 UE-1发送切换命令消息， 比如发送 Handover Command (切换命令 ) 消息， 通知 UE-1切换到 CS域； 步骤 1821、 UE-1收到切换命令， 调整接入方式为接入 CS域； 至此 UE-1和 AGW间建立起来了 CS媒体连接路径， 由 UE-1和 CS网 络， CS网络与 AGW间的 CS媒体连接组成， 再通过 AGW的连接作用， 将 新建 CS媒体与原 IMS媒体连接 2连接起来，使 UE-1能继续和 UE-2进行通 话。
第九架构实施例 图 19是本发明实施例的基于架构图 2的 ICP与 SC AS合一架构图， 描 述了为实现增强单待业务连续性， 参与实现的网络各相关部分或网元， 以及 它们间的接口或连接关系， 其描述如下： 相关网元描述： 标准 SRVCC架构部分： 与图 4各网元相同；
SC AS: IMS标准的业务连续性应用服务器功能， 新增控制 AGW分配 资源， 映射或关联媒体路径的功能；
AGW: 访问网关 （ Access GateWay ) , 实现 IP媒体数据的转发； 相关接口描述：
S1902 - S1908: 与图 4中的 S402 ~ S408相同; 由于 SC AS为 IMS网络网元， 因此 UE与 IMS网络间的信令接口没有 显示与描述， 其为 IMS标准接口。
S1914: 与图 4中的 S414相同； S1916: SC AS和 AGW间的信令接口， 使 SC AS控制 AGW分配资源， 映射或关联媒体路径；
S1918: SC AS和 IMS的 CSCF间的信令接口，为 IMS标准的 ISC接口；
第六流程实施例 图 20是本发明实施例的基于图 19的增强单待业务连续性流程图， 描述 了 UE-1和 UE-2间的 IMS会话建立完成后， UE-1发生单待业务连续性，UE-1 及网络如何实现让 UE-1使用 CS域建立媒体连接，并保持原会话连续的过程， 为简化描述， 将 SC AS和 CSCF画在一起， 包括如下步骤： 步骤 2001、 与图 5的步骤 501 ~ 510相似， 只是 UE和 SC AS间的 IMS 消息传递按标准过程经过标准 IMS的各 CSCF网元， UE-1和远端建立了 IMS 媒体连接， 其中包括 UE-1与 AGW间的 IMS媒体连接 1和 AGW与远端间 的 IMS媒体连接 2。 步骤 2002、 与图 5中的步骤 511 ~ 517相同； 步骤 2003、 eMSC收到 PS网络控制网元的切换请求消息后， 向 SC AS 发送呼叫请求， 该请求通过 S1914的信令路径发送， 此实施例中 S1914接口 使用 IMS标准的 12接口， 因此发送的是 SIP的 INVITE (邀请 ) 消息， 呼叫 请求中会携带 UE-1的号码信息和 SC AS的号码信息， 其中 SC AS的号码信 息作为被叫信息， UE-1 的号码信息作为主叫信息， 并且消息中携带 eMSC 的接收媒体数据的传输地址 H; 该步骤可在步骤 2002没完成前执行， 具体参见步骤 518的相关描述。 步骤 2004、 SC AS判断 2003的呼叫请求为 2001的会话的切换请求， 请 求 AGW执行映射操作， 比如发送 Map request (映射请求）消息，携带 eMSC 的传输地址 H和原 IMS媒体连接 2的传输地址 F, 或原 IMS媒体连接 1的 传输地址 D; 步骤 2005、 AGW执行映射操作， 将新建媒体连接与原 IMS媒体连接 2 连接起来， 并分配新的近端媒体数据接收端口 J, 为简化描述， 端口 J对应 的传输地址信息仍旧表示为 J, 映射操作完成后， AGW通过 S1916接口向 SC AS发送映射响应消息 , 比如发送 Map response (映射响应） 消息 , 消息 携带 AGW接收媒体数据的传输地址 J; 步骤 2006、 SC AS收到映射响应， 通过 S1914的信令路径向 eMSC发送 应答消息， 比如发送 " 200 OK" 消息， 消息携带获得的 AGW的媒体资源信 息； 至此 eMSC和 AGW间建立起新的 IMS媒体路径， eMSC将该新建媒体 路径和 CS媒体路径接起来， AGW将该新建媒体路径和 IMS媒体连接 2连 接起来， 使 UE- 1能继续和 UE-2进行通话。 该架构下，如果 eMSC和 SC AS间使用 Nc-SIP接口，则步骤 2003 ~ 2006 与图 7的步骤 703 ~ 706相同， 如果使用 Nc-ISUP接口， 则步骤 2003 ~ 2006 与图 8的步骤 803 ~ 808相同， 如果 eMSC和 SC AS间通过媒体网关相连， 则从 SC AS侧看去流程与此相同，只是 eMSC与 AGW间的媒体连接由 eMSC 与媒体网关间的 CS媒体连接与媒体网关与 AGW间的 IMS媒体连接组成， 因为过程完全是标准化的， 在此不赘述各种可能情况。 尽管本发明结合特定实施例进行了描述， 但是对于本领域的技术人员来 说， 可以在不背离本发明的精神或范围的情况下进行修改和变化。 这样的修 改和变化被视作在本发明的范围和附加的权利要求书范围之内。
工业实用性 本发明提供一种单待业务连续性实现方法及单待业务连续性系统， 可有 效地减少现有技术中中断时间过长的问题， 大大改善用户体验。

Claims

权 利 要 求 书
1、一种单待业务连续性实现方法，其包括，所述方法是在用户终端 UE-1 通过包交换 PS网络与远端建立了信令锚定到 IP多媒体子系统控制点 ICP及 媒体锚定到 ICP控制的访问网关 AGW的 IP多媒体子系统 IMS会话后实现： PS网络控制网元向增强移动交换中心 eMSC发送切换请求，请求将所述
IMS会话切换到通过电路交换 CS网络接入； 所述 eMSC接收到所述切换请求后， 为 UE-1准备与所述 eMSC的媒体 链路资源， 并向 ICP发送呼叫请求；
ICP控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS会话的远端 媒体链路进行关联。
2、 如权利要求 1所述的方法， 其中： eMSC发送的所述呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中， 所述 ICP接收到所述 SIP呼叫请求消息后， 将所述传输 地址 H与所述远端媒体链路的外部接收地址 F进行关联，并将所述新建媒体 链路中用于接收所述 eMSC发送的媒体数据的传输地址 J通过 SIP应答呼叫 发送给所述 eMSC。
3、 如权利要求 2所述的方法， 其中： 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中： 所述 ICP接收到所述 SIP呼叫请求消息后， 向访问网关 AGW发送映射 请求， 该请求中携带所述传输地址 H; AGW将所述传输地址 H与所述远端媒体链路进行关联， 并分配所述传 输地址 J, 将所述传输地址 J通过映射响应发送给 ICP。
4、 如权利要求 1所述的方法， 其中： eMSC发送的所述呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中， 所述 ICP接收到所述初始地址消息后， 向所述 eMSC返 回 ISUP的 ANM消息， 该消息中携带所述新建媒体链路中用于在 eMSC端 与远端之间传输 CS媒体的线路资源的线路号 L2。
5、 如权利要求 4所述的方法， 其中： 在 ICP将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路 进行关联的步骤中： 所述 ICP接收到所述初始地址消息后， 向 AGW发送映射请求， 该请求 中携带所述线路号 L1 ; 接收到所述映射请求后， AGW将线路号 L1与所述远端媒体链路进行关 联， 并分配所述线路号 L2, 将所述线路号 L2通过映射响应发送给 ICP。
6、 一种单待业务连续性系统， 该系统包含： 包交换 PS网络控制网元、 电路交换 CS网络、 增强移动交换中心 eMSC、 IP多媒体子系统控制点 ICP 和访问网关 AGW; 其中： 所述 PS网络控制网元设置成： 向 eMSC发送切换请求， 请求将 IMS会 话切换到通过所述 CS网络接入； 所述 IMS会话为用户终端 UE-1通过所述 PS 网络与远端建立的信令锚定到 ICP及媒体锚定到 ICP控制的访问网关 AGW的会话； 所述 eMSC设置成：在接收到所述切换请求后，为 UE-1准备与所述 eMSC 的媒体链路资源， 并向 ICP发送呼叫请求； 所述 ICP设置成：控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS 会话的远端媒体链路进行关联。
7、 如权利要求 6所述的系统， 其中： 所述 eMSC发送的呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 所述 ICP还设置成： 接收到所述 SIP呼叫请求消息后， 将所述传输地址 H与所述远端媒体链路的外部接收地址 F进行关联， 并将所述新建媒体链路 中用于接收所述 eMSC发送的媒体数据的传输地址 J通过 SIP应答呼叫发送 给所述 eMSC。
8、 如权利要求 7所述的系统， 其中： 所述 ICP还设置成： 接收到所述 SIP呼叫请求消息后， 向所述 AGW发 送映射请求， 该请求中携带所述传输地址 H; 所述 AGW设置成： 将所述传输地址 H与所述远端媒体链路进行关联，
9、 如权利要求 6所述的系统， 其中： 所述 eMSC发送的呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 所述 ICP还设置成：接收到所述初始地址消息后，向所述 eMSC返回 ISUP 的 ANM消息， 该消息中携带所述新建媒体链路中用于在 eMSC端与远端之 间传输 CS媒体的线路资源的线路号 L2。
10、 如权利要求 9所述的系统， 其中： 所述 ICP还设置成： 在接收到所述初始地址消息后向所述 AGW发送映 射请求， 该请求中携带所述线路号 LI ; 所述 AGW设置成：在接收到所述映射请求后将线路号 L1与所述远端媒 体链路进行关联， 并分配所述线路号 L2, 将所述线路号 L2通过映射响应发 送给 ICP。
11、 一种支持单待业务连续性系统的控制装置， 其包括相连的接收模块 和关联模块，
所述接收模块设置成： 接收增强移动交换中心 eMSC发送的呼叫请求， 并告知所述关联模块； 所述关联模块设置成：在用户终端 UE-1通过包交换 PS网络与远端建立 了信令锚定到所述控制装置及媒体锚定到所述控制装置控制的访问网关 AGW的 IP多媒体子系统 IMS会话后， 根据接收到的所述呼叫请求， 控制 AGW将所述呼叫请求建立的媒体链路与所述 IMS会话的远端媒体链路进行 关联。
12、 如权利要求 11所述的控制装置， 其中， 所述 eMSC发送的呼叫请求为初始会话协议 SIP呼叫请求消息； 该消息 中携带所述 eMSC 新分配的新建媒体链路中用于接收媒体数据的传输地址 H; 所述关联模块还设置成： 将所述传输地址 H与所述远端媒体链路的外部 接收地址 F进行关联， 并将所述新建媒体链路中用于接收所述 eMSC发送的 媒体数据的传输地址 J通过 SIP应答呼叫发送给所述 eMSC。
13、 如权利要求 11所述的控制装置， 其中， 所述 eMSC发送的呼叫请求为综合业务数字网络用户协议 ISUP的初始 地址消息， 该消息中携带新建媒体链路中 eMSC端用于传输 CS媒体的线路 资源的线路号 L1 ; 所述关联模块还设置成： 向所述 eMSC返回 ISUP的 ANM消息， 所述
ANM消息中携带所述新建媒体链路中用于在 eMSC端与远端之间传输 CS媒 体的线路资源的线路号 L2。
PCT/CN2010/071771 2009-05-22 2010-04-14 一种单一无线语音呼叫连续性实现方法及单一无线语音呼叫连续性系统 WO2010133112A1 (zh)

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