WO2012041026A1 - 电路交换域业务切换到分组交换域的方法及系统 - Google Patents

电路交换域业务切换到分组交换域的方法及系统 Download PDF

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Publication number
WO2012041026A1
WO2012041026A1 PCT/CN2011/070544 CN2011070544W WO2012041026A1 WO 2012041026 A1 WO2012041026 A1 WO 2012041026A1 CN 2011070544 W CN2011070544 W CN 2011070544W WO 2012041026 A1 WO2012041026 A1 WO 2012041026A1
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WIPO (PCT)
Prior art keywords
domain
proxy
domain service
switching request
service switching
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PCT/CN2011/070544
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English (en)
French (fr)
Inventor
谢振华
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ZTE Corp
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ZTE Corp
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Publication date
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Priority to US13/876,698 priority Critical patent/US8934454B2/en
Priority to JP2013529529A priority patent/JP5645329B2/ja
Priority to EP11827922.3A priority patent/EP2624631B1/en
Publication of WO2012041026A1 publication Critical patent/WO2012041026A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H04W76/00—Connection management
    • H04W76/10—Connection setup

Definitions

  • the present invention relates to a handover technology when a user equipment (UE, User Equipment) having a circuit switched (CS) domain service is switched from a non-packet switched (PS, Packet Switch) network to a PS network, and more particularly to an IP multimedia sub- A method and system for a user to switch from a circuit switched domain to a packet switched domain in a system (IMS, IP Multimedia Core Network Subsystem).
  • UE User Equipment
  • PS Packet Switch
  • IMS IP Multimedia Core Network Subsystem
  • IMS IP-based network architecture proposed by the 3rd Generation Partnership Project (3GPP). It builds an open and flexible business environment, supports multimedia applications, and provides users with rich multimedia services.
  • 3GPP 3rd Generation Partnership Project
  • control layer In the IMS service system, 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 functions in the control layer are performed by the Call Session Control Function (CSCF, Call Session Control Function).
  • the call session control functions mainly include: proxy call session control function (P-CSCF, Proxy-CSCF), query call session control function (I-CSCF, Interrogating-CSCF) and service call session control function (S-CSCF, Serving-CSCF)
  • P-CSCF proxy call session control function
  • I-CSCF query call session control function
  • S-CSCF Service Call session control function
  • S-CSCF Serving-CSCF
  • the service layer is composed of a series of application servers (AS, Application Server), which can provide specific service services.
  • AS application servers
  • the AS can be an independent entity or exist in the S-CSCF.
  • the control layer controls the service trigger according to the subscription information of the user, invokes the service on the AS, and implements the service function.
  • the end-to-end device in the session is called User Equipment (UE) and is responsible for interaction with the UE user.
  • UE User Equipment
  • the UE has multiple ways of accessing the network, including PS through 3GPP.
  • the domain accesses the network, or accesses the network through other non-3GPP PS domains, and even accesses the network through the CS domain.
  • an IMS user accesses and initiates a call in the CS domain, its call signaling needs to be routed to the IMS domain to which the user belongs, thereby providing services to the user.
  • the UE can only use the CS domain or the PS domain to provide voice services at a certain time, but cannot use the CS domain and the PS domain to provide voice services at the same time, when the UE uses the CS domain to provide voice services, the PS domain switching occurs, and the PS needs to be used.
  • the domain provides voice services, it is called Reverse Single Radio Voice Call Continuity (RSRVCC).
  • the UE may still use the PS domain to provide other non-speech services when using the CS domain to provide voice services, it is still possible to have non-voice service switching of the PS domain at the same time when reverse single-standby voice switching occurs. Since the UE provides services in the source network by the CS domain and the PS domain respectively, and the target network after the handover is only served by the PS domain, it is necessary to synchronize CS handover and PS handover during handover, that is, synchronous CS domain to PS domain handover. And switching from the PS domain to the PS domain. Summary of the invention
  • the main object of the present invention is to provide a method and system for switching a circuit switched domain service to a packet switched domain, which can accurately and quickly switch the CS domain service of the UE in the non-PS network to the PS network.
  • the serving network base station system decides to switch the circuit switched (CS) domain service of the user equipment (UE) to the PS domain of the target network, the CS domain service switching request of the UE is sent to the HO-Proxy;
  • the HO-Proxy requests the target network control entity to switch the CS domain service of the UE to the PS domain of the target network, or the HO-Proxy switches the CS domain service of the UE to the PS domain of the target network.
  • the method further includes:
  • the UE establishes a bearer in the monthly service network or the target network through an IP Multimedia Subsystem (IMS) network, or initiates an IMS session, or directly establishes a bearer in the service network or the target network.
  • IMS IP Multimedia Subsystem
  • the HO-Proxy requests the target network control entity to switch the CS domain service of the UE to the PS domain of the target network, or the HO-Proxy switches the CS domain service of the UE to the PS of the target network.
  • the domain also includes:
  • the HO-Proxy associates a PS domain service switching request of the UE with a CS domain service switching request of the UE.
  • the CS domain service switching request of the UE carries identifier information indicating whether the UE has a PS domain service.
  • the method further includes:
  • the serving network base station system sends a PS domain service switching request of the UE to the HO-Proxy;
  • the HO-Proxy requests the target network control entity to switch the CS domain and the PS domain service of the UE to the PS domain of the target network, or the HO-Proxy uses the CS domain service of the UE
  • the PS domain service is switched to the PS domain of the target network.
  • the method further includes:
  • the PS domain service switching request of the UE sent by the serving network base station system carries identifier information indicating that the UE has a CS domain service.
  • the HO-Proxy is associated with the PS domain service switching request of the UE and the CS domain service switching request of the UE, specifically:
  • the HO-Proxy When the HO-Proxy first receives the PS domain service switching request of the UE, it is determined that the UE further has a CS domain service.
  • the HO-Proxy associates a PS domain service switching request of the UE with the UE
  • the cs domain service switching request is specifically:
  • the HO-Proxy When the HO-Proxy first receives the PS domain service switching request of the UE, it is determined that the UE further has a CS domain service according to the identifier information of the CS domain service in the PS domain service switching request; or receives the first When the CS domain service switching request of the UE is requested, the UE determines that the UE further has a PS domain service according to the identifier information indicating the PS domain service in the CS domain service switching request.
  • the HO-Proxy is associated with the PS domain service switching request of the UE and the CS domain service switching request of the UE, specifically:
  • the HO-Proxy determines whether the UE further has a PS domain service according to whether the CS domain service switching request has the identifier information of the PS domain service.
  • the serving network base station system sends the CS domain service switching request of the UE to the HO-Proxy, specifically:
  • the serving network base station system carries the information that can be associated with the HO-Proxy in the CS domain service switching request, and sends the CS domain service switching request; or the serving network base station system uses the CS domain
  • the service switching request is sent to the HO-Proxy; or the serving network base station system sends the CS domain service switching request to the serving network MSC, where the serving network MSC sends a CS domain service switching request to the HO-Proxy .
  • the serving network base station system sends the CS domain service switching request and the PS domain service switching request of the UE to the HO-Proxy, specifically:
  • the serving network base station system carries information that can be associated with the HO-Proxy in the CS domain service switching request and the PS domain service switching request, and sends the CS domain service switching request and/or the PS a domain service switching request; or, the serving network base station system sends the CS domain service switching request to the HO-Proxy, and the serving network base station system sends the PS domain service switching request to the serving network SGSN , the service network SGSN sends PS The domain service switching request is sent to the HO-Proxy; or the serving network base station system sends the CS domain service switching request to the serving network MSC, where the serving network MSC sends a CS domain service switching request to the HO-Proxy And, the serving network base station system sends the PS domain service switching request to the HO-Proxy.
  • the HO-Proxy switches the CS domain service of the UE to the PS domain of the target network, specifically:
  • the HO-Proxy queries the serving network SGSN or the target network control entity that the UE establishes the bearer to query the bearer information, performs the PS domain handover operation, and uses the bearer service established by the UE. Said the original service of the UE on the CS domain; or,
  • the HO-Proxy When the UE has a PS domain service, the HO-Proxy performs a PS domain handover operation, and uses the bearer established by the UE to serve the UE's original service on the CS domain.
  • the target network control entity is an MME or an SGSN
  • the HO-Proxy is an MSC or an SGSN or a target network control entity.
  • a system for switching a circuit switched domain service to a packet switched domain comprising a serving network base station system, a target network control entity, and a HO-Proxy for switching to a PS domain of the target network; wherein, the serving network base station system is configured to determine When the CS domain service of the UE is switched to the PS domain of the target network, the CS domain service switching request of the UE is generated and sent to the HO-Proxy;
  • the HO-Proxy is configured to: after receiving the CS domain service switching request of the UE, request the target network control entity to switch the CS domain service of the UE to the PS domain of the target network, or use the CS of the UE The domain service is switched to the PS domain of the target network.
  • the system further includes a user equipment (UE), and the UE is configured to serve in the IMS network before the serving network base station system decides to switch the CS domain service of the UE to the PS domain of the target network.
  • the network or the target network establishes a bearer, or initiates an IMS session, or establishes a bearer directly on the service network or the target network.
  • the HO-Proxy requests the target network control entity to set the CS domain of the UE Before the service is switched to the PS domain of the target network, or the HO-Proxy switches the CS domain service of the UE to the PS domain of the target network, the HO-Proxy is further used to associate the PS domain service switching request of the UE. And a CS domain service switching request of the UE.
  • the serving network base station system is further configured to: in the CS domain service switching request of the UE, carry the identifier information of whether the UE has a PS domain service.
  • the UE further has a PS domain service
  • the service network is further configured to send a PS domain service switching request of the UE to the HO-Proxy;
  • the HO-Proxy further requests the target network control entity to switch the CS domain and the PS domain service of the UE to the PS domain of the target network, or the HO-Proxy further further uses the CS domain service and the PS domain service of the UE. Switch to the PS domain of the target network.
  • the PS domain service switching request of the UE sent by the serving network base station system carries identifier information indicating that the UE has a CS domain service.
  • the HO-Proxy is further configured to: when receiving the PS domain service switching request of the UE, determine that the UE further has a CS domain service.
  • the HO-Proxy is further configured to: when receiving the PS domain service switching request of the UE, determine, according to the identifier information of the CS domain service in the PS domain service switching request, that the UE further has a CS domain. business.
  • the HO-Proxy is further configured to, when receiving the CS domain service switching request of the UE, determine, according to the identifier information of the PS domain service in the CS domain service switching request, whether the UE is still Has a PS domain business.
  • the serving network base station system is further configured to: carry, in the CS domain service switching request, information that can be associated with the HO-Proxy, and send the CS domain service switching request; or: The domain service switching request is sent to the HO-Proxy; or the CS domain service switching request is sent to the serving network MSC, and the serving network MSC sends a CS domain service switching request to the HO-Proxy.
  • the serving network base station system is further configured to: carry information that can be associated with the HO-Proxy in the CS domain service switching request and the PS domain service switching request, and send the CS domain service switching Requesting and/or the PS domain service switching request; or transmitting the CS domain service switching request to the HO-Proxy, and the serving network base station system transmitting the PS domain service switching request to the serving network SGSN, the serving network SGSN sends a PS domain service switching request to the HO-Proxy; or sends the CS domain service switching request to the serving network MSC, where the serving network MSC sends a CS domain service switching request to the SGSN
  • the HO-Proxy, and the serving network base station system sends the PS domain service switching request to the HO-Proxy.
  • the HO-Proxy further queries the serving network SGSN or the target network control entity that establishes a bearer for the UE to query bearer information, performs a PS domain handover operation, and establishes using the UE.
  • the bearer service of the UE originally on the CS domain;
  • the UE has a PS domain service
  • the HO-Proxy further performs a PS domain handover operation, and uses the bearer established by the UE to serve the service of the UE in the CS domain.
  • the serving network when the serving network determines that the UE with the CS domain service needs to be handed over to the PS network, the serving network will forward the CS domain service switching request to the HO-Proxy, and may also forward the PS domain service switching request to the HO- Proxy, the HO-Proxy requests the target network control entity to switch the CS domain service to the PS network, or the HO-Proxy switches the CS domain service to the PS network. That is, the present invention handles the handover of the CS domain service to the PS network through the HO-Proxy.
  • the HO-Proxy can be located in the MSC or SGSN or the target network control entity.
  • the PS bearer resources can be accurately reserved for the corresponding service (CS domain service and/or PS domain service) of the UE, thereby realizing accurate and timely handover.
  • 1 is a flow of a first embodiment of a method for switching a circuit switched domain service to a packet switched domain according to the present invention Cheng Tu
  • Embodiment 2 is a flow chart of Embodiment 2 of a method for switching a circuit switched domain service to a packet switched domain according to the present invention. detailed description
  • the basic idea of the present invention is that when the serving network determines that the UE with the CS domain service needs to be handed over to the PS network, the serving network will forward the CS domain service switching request and/or the PS domain service switching request to the HO-Proxy.
  • the HO-Proxy performs handover of the CS domain service to the PS network.
  • FIG. 1 is a flowchart of Embodiment 1 of a method for switching a circuit switched domain service to a packet switched domain according to the present invention.
  • an application scenario of the present example is that UE-1 establishes a call through a CS domain and UE-2.
  • UE-1 may have other non-voice PS domain services.
  • PS network target network
  • all services need to be switched to the PS domain of the target network.
  • the circuit switched domain service of this example is switched to the packet.
  • the method of exchanging domains specifically includes the following steps:
  • Step 100 This step is optional.
  • the UE-1 requests the serving network to establish a PS bearer, for example, by sending a Bearer Resources Command message, or implementing an bearer establishment by interacting with the monthly service network through the IMS network, for example, initiating an IMS session.
  • the P-CSCF is required to establish a bearer and the P-CSCF interacts with the service network to implement bearer establishment.
  • This step may occur at any time before the handover. If the UE-1 first accesses the target network, it may also be at the target. The network establishes a bearer. At this time, the bearer is established by the target network base station system and the target network control entity. In this case, after the UE-1 moves to the service network, the CS service is established, and then the subsequent steps are performed.
  • Step 101 The UE-1 sends a measurement report to the network served by the UE-1, and reports the cell signal strength measurement information.
  • Step 102 The base station subsystem of the network served by the UE-1 determines, according to the signal strength measurement information of each cell in the measurement report of the UE-1, that the target network PS domain of the target cell is more suitable for the UE-1 service, and then determines to perform the handover operation.
  • the base station subsystem of the service network sends a handover request to the MSC, for example, a Handover Required message, and the target ID of the handover request message may be set to be available to each network element (such as the MSC) of the service network.
  • the handover request is routed to the target identifier of the HO-Proxy; if the UE-1 has a PS service, the handover request message further carries information indicating that there is a "PS service", for example, carried in the target ID.
  • the handover agent may be included in the MSC of the serving network or in the SGSN or in the target network control entity.
  • Step 103 The MSC sends a handover request message to the HO-Proxy.
  • the target ID of the handover request message is the target ID of the received handover request message (Handover required).
  • the handover request message carries information indicating "with PS service", for example, carried in the target ID, and when the HO-Proxy is in the control network element of the SGSN or the target network, for example, sending CS to PS HO Request message, where the target ID of the HO-Proxy in the MME also points to the HO-Proxy (this target ID is not necessarily the target ID of the received handover request message (Handover required), but may be carried according to the received handover request message.
  • the target ID or other field information is obtained.
  • the MSC can, for example, determine the HO-Proxy according to the configuration or the connection relationship.
  • the handover request message carries the information indicating the "PS service". , for example, carried in the target ID.
  • the Handover Required message sent to the MSC is sent to the HO-Proxy at the same time, and there is no more step 103 in the process.
  • Step 104 The HO-Proxy receives the handover request message from the CS domain (that is, when the MSC or the HO-Proxy is included in the MSC, it may also be from the base station subsystem), if the handover request message carries the indication "has a PS service" Information, waiting for a handover request message from the PS domain, If the HO-Proxy is in the SGSN, the HO-Proxy knows whether the user has a PS service and does not need to judge according to the indication information.
  • Step 105 If the UE-1 has a data service in the PS domain, the base station subsystem of the serving network also sends a handover request message to the data domain control entity (ie, the SGSN) of the service network, for example, sending a Relocation Required message, and switching the request.
  • the target identifier (target ID) of the message may be set to be able to be routed by the network element of the service network (such as the SGSN) to the target identifier of the HO-Proxy, and the handover request message may carry an indication.
  • Information about the CS service such as carried in the target ID.
  • the partial information of the target ID may be used to indicate that the current handover is PS and the CS is switched to the PS (ie, indicating "with CS service"), for example, by using a location area identifier (LAI) or a wireless area identifier in the target ID ( RAI, Routing Area Identity) to indicate, for example, that the current handover is a PS and the CS is switched to the PS by a specific LAI or RAI.
  • LAI location area identifier
  • RAI Routing Area Identity
  • the HO-Proxy After the HO-Proxy first receives the handover request from the PS domain, if the HO-Proxy is in the MSC, the normal PS domain to PS domain handover request will not reach the HO-Proxy, and the HO-Proxy may determine Waiting for a handover request from the CS domain, or waiting for a handover request from the CS domain when the HO-Proxy determines that the received handover request from the PS domain has "CS service" information, or when the HO-Proxy receives the CS from the CS first
  • the handover request of the domain may wait for the handover request from the PS domain according to the information of the "PS service" carried in the CS domain handover request, thereby implementing the handover request of the associated PS domain and the CS domain.
  • the present invention can also set the identification information of the CS domain service and the PS domain service simultaneously in the handover request of the PS domain service and the handover request of the CS domain service; thus, the handover request of the PS domain service is first HO-
  • the Proxy receives the handover request of the CS domain service and is first received by the HO-Proxy.
  • the HO-Proxy can determine whether the UE is to be carried by whether the received handover request carries the identifier of the PS and the CS to the PS.
  • CS domain service and PS domain service Switch to the PS domain of the target network.
  • the HO-Proxy determines that the received handover request carries the identification information of the CS domain service and the PS domain service, the handover request of the CS domain service and the handover of the PS domain service are confirmed. After the request, a handover request is sent to the corresponding network element of the target network, otherwise it waits for another handover request.
  • Step 106 The SGSN sends a handover request message to the HO-Proxy.
  • the target of the handover request message The ID is the target ID of the received handover request message (ie, pointing to the HO-Proxy).
  • the SGSN may, for example, determine the HO-Proxy according to the configuration or connection relationship.
  • the Relocation Required message is sent to the HO-Proxy at the same time, and there will be no more steps 106 in the process.
  • Step 107 The HO-Proxy associates information in the handover request message from the CS domain and the PS domain, that is, the handover request from the CS domain and the PS domain is associated with the method described in step 105, if there is a handover request from the two domains.
  • the message based on the related information therein, generates corresponding information that can be identified by the target network and merges them together as parameters of the handover request message in step 109.
  • Step 108 if step 100 is not performed, this step is an optional step.
  • the HO-Proxy applies to the data network gateway (ie, the SGW (Serving Gateway) and the PGW (PDN Gateway)) to establish a voice payload, and sends the voice carrier.
  • Bearer Resource Command, ⁇ performs step 100, and this step is also an optional step.
  • the HO-Proxy queries the serving network SGSN or the target network control entity that establishes the bearer for the UE-1 to query bearer information, such as sending a PDP. The Context Request message, thereby obtaining the information.
  • Step 109 if the step of step 108 is performed, after step 108, if step 108 is not performed, after step 107, if the HO-Proxy is not in the control entity of the target network, the control of the HO-Proxy to the target network Entity, Long Term Evolution (LTE, Long Term) Evolution)
  • the SGSN of the network's Mobile Management Entity or HSPA (High Speed Packet Access) network sends a handover request, such as sending a CS to PS Handover Request message, if the HO-Proxy is on the target network.
  • a handover request such as sending a CS to PS Handover Request message, if the HO-Proxy is on the target network.
  • the control entity there is no step 109. If the HO-Proxy obtains the bearer information, the handover request carries the obtained bearer information.
  • Step 110 If the HO-Proxy does not perform step 100 and the steps of step 108 are not performed, the target network control entity or HO-Proxy (if the HO-Proxy is in the target network control entity) requests to establish a voice bearer, such as sending a Bearer Resource Command. If step 100 is performed, the target network control entity or the HO-Proxy (if the HO-Proxy is in the target network control entity) queries the serving network SGSN or the target network control entity that establishes the bearer for the UE-1, such as sending PDP Context Request message, thereby obtaining bearer information.
  • a voice bearer such as sending a Bearer Resource Command.
  • Step 111 The target network control entity sends a handover request to the target network base station subsystem, for example, sending a Handover Request message.
  • Step 112 The target network base station subsystem responds to the handover response message, for example, sends a Handover Request Acknowledge message.
  • Step 113 After receiving the handover response, the target network control entity sends a handover response message to the HO-Proxy, for example, sending a CS to PS Handover Response message.
  • Step 114 The HO-Proxy sends a handover response message to the MSC of the serving network, for example, sending a Prep HO Response message.
  • Step 115 The MSC of the serving network sends a handover command to the serving network base station subsystem, for example, sending a Handover Command message;
  • Step 116 If the UE-1 has a data service, the HO-Proxy also sends a handover response to the serving network SGSN, for example, sending a Forward Relocation Response message;
  • Step 117 The serving network SGSN sends a handover command to the serving network base station subsystem, for example, sending a Relocation Command message;
  • Step 118 The serving network base station subsystem merges two handover commands, and sends a message to the UE-1 to switch to the target network, for example, sending a HO from UTRAN/GERAN message;
  • Step 119 The UE-1 performs handover and modulates into the target network.
  • the UE-1 provides services, including voice services, through the PS domain of the target network, so that the UE-1's voice service originally in the CS domain can continue to be provided in the PS domain of the target network.
  • FIG. 2 is a flowchart of Embodiment 2 of a method for switching a circuit switched domain service to a packet switched domain according to the present invention.
  • the application scenario of the present example is that UE-1 establishes a call through the CS domain and UE-2.
  • UE-1 may have other non-voice PS domain services.
  • PS network target network
  • All services need to be switched to the PS domain of the target network.
  • the circuit switched domain service of this example is switched to the packet.
  • the method of exchanging domains specifically includes the following steps:
  • this step is optional.
  • the UE-1 requests the serving network to establish a PS bearer, for example, by sending a Bearer Resources Command message, or implementing an bearer establishment by interacting with the monthly service network through the IMS network, for example, initiating an IMS session.
  • the P-CSCF is required to establish a bearer and the P-CSCF interacts with the service network to implement bearer establishment.
  • This step may occur at any time before the handover. If the UE-1 first accesses the target network, it may also be at the target. The network establishes a bearer. At this time, the bearer is established by the target network base station system and the target network control entity. In this case, after the UE-1 moves to the service network, the CS service is established, and then the subsequent steps are performed.
  • Step 201 UE-1 sends a measurement report to the network it serves, and the cell signal strength measurement information is reported above.
  • Step 202 The base station subsystem of the network served by the UE-1 determines, according to the signal strength measurement information of each cell in the measurement report, that the nearby PS target network is more suitable for the UE-1 service, and then determines to perform the handover operation, and the base station subsystem of the service network.
  • Sending a handover request to the SGSN for example, sending a Relocation Required message
  • the target identifier of the handover request message may be set to be
  • the network element of the service network (such as the SGSN) routes the handover request to the target identifier of the HO-Proxy, and the handover request message may carry information indicating that there is a CS service, for example, carrying in the target ID, and switching
  • the proxy may be included in the MSC or in the SGSN or in the target network control entity.
  • Step 203 The SGSN sends a handover request message to the HO-Proxy.
  • the target of the handover request message The ID is the target ID of the received handover request message (ie, pointing to the HO-Proxy).
  • the SGSN may, for example, determine the HO-Proxy according to the configuration or connection relationship;
  • the Relocation Request message is sent to the HO-Proxy at the same time, and there is no more step 203 in the process.
  • the partial information of the target ID may be used to indicate that the current handover is PS and the CS is switched to the PS (ie, indicating "with CS service"), for example, by using a location area identifier (LAI) or a wireless area identifier in the target ID ( RAI, Routing Area Identity) to indicate, for example, that the current handover is a PS and the CS is switched to the PS by a specific LAI or RAI.
  • LAI location area identifier
  • RAI Routing Area Identity
  • the HO-Proxy After the HO-Proxy first receives the handover request from the PS domain, if the HO-Proxy is in the MSC, the normal PS domain to PS domain handover request will not reach the HO-Proxy, and the HO-Proxy may determine Waiting for a handover request from the CS domain, or waiting for a handover request from the CS domain when the HO-Proxy determines that the received handover request from the PS domain has "CS service" information, or when the HO-Proxy receives the CS from the CS first
  • the handover request of the domain may wait for the handover request from the PS domain according to the information of the "PS service" carried in the CS domain handover request, thereby implementing the handover request of the associated PS domain and the CS domain.
  • the present invention can also perform a handover request for a PS domain service and a handover request for a CS domain service.
  • the identifier information of the CS domain service and the PS domain service is switched at the same time; thus, whether the handover request of the PS domain service is received by the HO-Proxy first, or the handover request of the CS domain service is first received by the HO-Proxy, HO
  • the Proxy can determine whether the CS domain service and the PS domain service of the UE are simultaneously switched to the PS domain of the target network by whether the received handover request carries the identifier of the PS and the CS handover to the PS.
  • the HO-Proxy determines that the received handover request carries the identification information of the CS domain service and the PS domain service, the handover request of the CS domain service and the handover of the PS domain service are confirmed. After the request, a handover request is sent to the corresponding network element of the target network, otherwise it waits for another handover request.
  • Step 204 After receiving the handover request message from the PS domain, the HO-Proxy waits for a handover request message from the CS domain.
  • Step 205 The base station subsystem of the service network further sends a handover request (that is, a handover request message of the CS domain) to the MSC, for example, sending a Handover Required message, where the target identifier of the handover request message can be set to be able to be used by each network element of the service network.
  • the MSC routes the handover request to the target identifier of the HO-Proxy.
  • the handover request message carries information indicating that there is a "PS service", for example, in the target ID.
  • the handover proxy may be included in the MSC or in the SGSN or in the control entity of the target network. If the HO-Proxy is in the SGSN, the HO-Proxy may know whether the user has the PS service without judging according to the indication information;
  • Step 206 The MSC sends a handover request message to the HO-Proxy.
  • the HO-Proxy is in another MSC, for example, sending a Prep_HO Request
  • the target ID of the handover request message is the target ID of the received handover request message, and the handover request message is sent.
  • the MSC can, for example, determine the HO-Proxy in the configuration or connection relationship.
  • the handover request message carries information indicating that there is a "PS service", such as the target ID. Carry in
  • the Handover Required message sent to the MSC is simultaneously sent to the HO-Proxy, and there is no more step 206 in the process.
  • Steps 207 to 219 are identical to steps 107 to 119 of Fig. 1 described above.
  • the UE-1 provides services, including voice services, through the PS domain of the target network, so that the UE-1's voice service originally in the CS domain can continue to be provided in the PS domain of the target network.
  • association as used in the present invention may also be referred to as "synchronization”.
  • the present invention also describes a system for switching a circuit switched domain service to a packet switched domain, including a serving network base station system, a target network control entity, and a HO-Proxy for switching to a PS domain of a target network; those skilled in the art should understand
  • the foregoing service network and the target network are all in the UE in the handover state, and the foregoing networks are all existing networks. Therefore, the structure of the system in which the circuit switched domain service of the present invention is switched to the packet switched domain is clear, Re-illustration.
  • some of the network elements in the foregoing network are different from the functions performed by the existing network elements. That is, the following corresponding functions are added to the network elements involved in the technical solution of the present invention, which are described in detail below.
  • a service network base station system configured to determine a CS domain service switching request of the UE and send the message to the HO-Proxy when the CS domain service of the UE is switched to the PS domain of the target network;
  • the HO-Proxy is configured to: after receiving the CS domain service switching request of the UE, request the target network control entity to switch the CS domain service of the UE to the PS domain of the target network, or use the CS of the UE The domain service is switched to the PS domain of the target network.
  • the system further includes a UE, where the UE is configured to establish a bearer in the serving network or the target network through the IMS network before the serving network base station system decides to switch the CS domain service of the UE to the PS domain of the target network, or , initiate an IMS session, or, directly, on the service network or target network.
  • the HO-Proxy requests the target network control entity to switch the CS domain service of the UE to the PS domain of the target network, or the HO-Proxy switches the CS domain service of the UE to the PS domain of the target network.
  • the HO-Proxy is further configured to associate a PS domain service switching request of the UE with a CS domain service switching request of the UE.
  • the service network base station system is further configured to: carry, in the CS domain service switching request of the UE, identifier information of whether the UE has a PS domain service.
  • the service network is further configured to send a PS domain service switching request of the UE to the HO-Proxy;
  • the HO-Proxy further requests the target network control entity to switch the CS domain and the PS domain service of the UE to the PS domain of the target network, or the HO-Proxy further further uses the CS domain service and the PS domain service of the UE. Switch to the PS domain of the target network.
  • the PS domain service switching request of the UE sent by the serving network base station system carries identifier information indicating that the UE has a CS domain service.
  • the foregoing HO-Proxy is further configured to: when receiving the PS domain service switching request of the UE, determine that the UE further has a CS domain service.
  • the foregoing HO-Proxy is further configured to: when receiving the PS domain service switching request of the UE, determine, according to the identifier information of the CS domain service in the PS domain service switching request, that the UE further has a CS domain service.
  • the foregoing HO-Proxy is further configured to: determine, according to the identifier information of the PS domain service in the CS domain service switching request, whether the UE further has a PS domain service, when receiving the CS domain service switching request of the UE .
  • the service network base station system is further configured to: carry, in the CS domain service switching request, information that can be associated with the HO-Proxy, and send the CS domain service switching request; or, the CS domain service switching request Sending to the HO-Proxy; or sending the CS domain service switching request to the serving network MSC, where the serving network MSC sends a CS domain service switching request
  • the HO-Proxy is requested.
  • the service network base station system is further configured to: carry the information that can be associated with the HO-Proxy in the CS domain service switching request and the PS domain service switching request, and send the CS domain service switching request and/or Or the PS domain service switching request is sent to the HO-Proxy, and the serving network base station system sends the PS domain service switching request to the serving network SGSN, where The serving network SGSN sends a PS domain service switching request to the HO-Proxy, or sends the CS domain service switching request to the serving network MSC, where the serving network MSC sends a CS domain service switching request to the HO-Proxy, And the serving network base station system sends the PS domain service switching request to the HO-Proxy
  • the HO-Proxy When the UE does not have the PS domain service, the HO-Proxy further queries the serving network SGSN or the target network control entity that establishes the bearer for the UE, performs the PS domain handover operation, and uses the bearer service established by the UE. If the UE has a PS domain service, the HO-Proxy further performs a PS domain handover operation, and uses the bearer service established by the UE, and the UE is originally on the CS domain. Business.

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Abstract

本发明公开了一种电路交换域业务切换到分组交换域的方法，设置用于向目标网络的PS域切换的切换代理（HO-Proxy）；所述方法包括：服务网络决定将具有CS域业务的UE切换到目标网络的PS域时，将所述UE的CS域业务切换请求发送至所述HO-Proxy；所述HO-Proxy请求目标网络控制实体将所述UE的CS域业务切换到目标网络的PS域，或所述HO-Proxy将所述UE的CS域业务切换到目标网络的PS域。本发明同时公开了一种实现上述方法的系统。本发明中，HO-Proxy用于CS域业务至PS网络的切换时，能为UE的相应业务（CS域业务和/或PS域业务）准确地预留PS的承载资源，从而实现准确及时的切换。

Description

电路交换域业务切换到分组交换域的方法及系统 技术领域
本发明涉及具有电路交换（ CS, Circuit Switch )域业务的用户设备（ UE, User Equipment ) 由非分组交换 ( PS , Packet Switch ) 网络切换到 PS网络 时的切换技术， 尤其涉及一种 IP多媒体子系统（IMS, IP Multimedia Core Network Subsystem )中用户从电路交换域切换到分组交换域的方法及系统。 背景技术
IMS 是由第三代合作伙伴计划 （3GPP , 3rd Generation Partnership Project )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由呼叫会话控制功能 （CSCF , Call Session Control Function ) 完成的。 呼叫会话控制功能主要有： 代理呼叫会 话控制功能 （P-CSCF, Proxy-CSCF ), 查询呼叫会话控制功能 （I-CSCF, Interrogating-CSCF )和服务呼叫会话控制功能 （ S-CSCF, Serving-CSCF ) 三种类型， 其中， S-CSCF功能是必须的， 而 I-CSCF是可选的。
业务层是由一系列应用服务器（AS , Application Server )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。
会话中的端到端设备称为用户设备 ( UE, User Equipment ), 负责与 UE 使用者之间的交互。 UE具有多种接入网络的方式， 包括通过 3GPP的 PS 域接入网络， 或通过其他非 3GPP的 PS域接入网络， 甚至可以通过 CS域 接入网络等。 当 IMS用户在 CS域接入并发起呼叫时， 其呼叫信令需要被 路由到用户归属的 IMS域， 从而为用户提供服务。
如果 UE某一时刻只能使用 CS域或 PS域提供语音服务， 而不能同时 使用 CS域和 PS域提供语音服务，当 UE使用 CS域提供语音服务时发生到 PS域的切换， 而需要使用 PS域提供语音服务时， 称之为反向单待语音切 换（ RSRVCC, Reverse Single Radio Voice Call Continuity )。
由于 UE在使用 CS域提供语音服务时仍可能使用 PS域提供其他非语 音服务， 因此在发生反向单待语音切换时， 仍有可能同时存在 PS域的非语 音业务切换。 由于 UE在源网络分别由 CS域和 PS域提供服务， 而在切换 后的目标网络只由 PS域提供服务， 势必需要在切换时同步 CS切换和 PS 切换， 即同步 CS域到 PS域的切换和 PS域到 PS域的切换。 发明内容
有鉴于此， 本发明的主要目的在于提供一种电路交换域业务切换到分 组交换域的方法及系统， 能将非 PS网络中 UE的 CS域业务准确快捷地切 换到 PS网络。
为达到上述目的， 本发明的技术方案是这样实现的：
一种电路交换域业务切换到分组交换域的方法， 设置用于向目标网络 的分组交换（PS )域切换的切换代理（HO-Proxy ); 所述方法包括：
服务网络基站系统决定将用户设备 ( UE )的电路交换（CS )域业务切 换到目标网络的 PS域时， 将所述 UE 的 CS域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy请求目标网络控制实体将所述 UE的 CS域业务切换到 目标网络的 PS域，或所述 HO-Proxy将所述 UE的 CS域业务切换到目标网 络的 PS域。 优选地， 在所述服务网络基站系统决定将所述 UE的 CS域业务切换到 目标网络的 PS域之前还包括：
所述 UE通过 IP多媒体子系统（ IMS ) 网络在月良务网络或目标网络建 立承载， 或， 发起 IMS会话， 或， 直接在服务网络或目标网络建立承载。
优选地， 在所述 HO-Proxy请求目标网络控制实体将所述 UE的 CS域 业务切换到目标网络的 PS域，或所述 HO-Proxy将所述 UE的 CS域业务切 换到目标网络的 PS域之前还包括：
所述 HO-Proxy关联所述 UE的 PS域业务切换请求和所述 UE的 CS域 业务切换请求。
优选地， 所述 UE的 CS域业务切换请求中携带有指示所述 UE是否具 有 PS域业务的标识信息。
优选地， 所述方法还包括：
所述 UE还具有 PS域业务时，所述服务网络基站系统将所述 UE的 PS 域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy请求目标网络控制实体将所述 UE的所述 CS域和所述 PS域业务切换到目标网络的 PS域，或所述 HO-Proxy将所述 UE的所述 CS 域业务和所述 PS域业务切换到目标网络的 PS域。
优选地， 所述方法还包括：
所述服务网络基站系统发送的所述 UE的 PS域业务切换请求中携带有 指示所述 UE具有 CS域业务的标识信息。
优选地，所述 HO-Proxy关联所述 UE的 PS域业务切换请求和所述 UE 的 CS域业务切换请求， 具体为：
所述 HO-Proxy在先接收到所述 UE的 PS域业务切换请求时， 确定所 述 UE还具有 CS域业务。
优选地，所述 HO-Proxy关联所述 UE的 PS域业务切换请求和所述 UE 的 cs域业务切换请求， 具体为：
所述 HO-Proxy在先接收到所述 UE的 PS域业务切换请求时， 根据所 述 PS域业务切换请求中的 CS域业务的标识信息确定所述 UE还具有 CS 域业务； 或先接收到所述 UE的 CS域业务切换请求时， 根据所述 CS域业 务切换请求中的指示有 PS域业务的标识信息确定所述 UE还具有 PS域业 务。
优选地，所述 HO-Proxy关联所述 UE的 PS域业务切换请求和所述 UE 的 CS域业务切换请求， 具体为：
所述 HO-Proxy在接收到所述 UE的 CS域业务切换请求时， 根据所述 CS域业务切换请求中的是否具有 PS域业务的标识信息确定所述 UE是否 还具有 PS域业务。
优选地， 所述服务网络基站系统将所述 UE的 CS域业务切换请求发送 至所述 HO-Proxy具体为：
所述服务网络基站系统在所述 CS 域业务切换请求中携带能关联到所 述 HO-Proxy的信息， 并发送所述 CS域业务切换请求； 或， 所述服务网络 基站系统将所述 CS域业务切换请求发送给所述 HO-Proxy; 或， 所述服务 网络基站系统将所述 CS域业务切换请求发送给服务网络 MSC, 所述服务 网络 MSC发送 CS域业务切换请求给所述 HO-Proxy。
优选地，所述服务网络基站系统将所述 UE的 CS域业务切换请求和 PS 域业务切换请求发送至所述 HO-Proxy具体为：
所述服务网络基站系统在所述 CS域业务切换请求和所述 PS域业务切 换请求中携带能关联到所述 HO-Proxy的信息， 并发送所述 CS域业务切换 请求和 /或所述 PS域业务切换请求； 或， 所述服务网络基站系统将所述 CS 域业务切换请求发送给所述 HO-Proxy, 并且， 所述服务网络基站系统将所 述 PS域业务切换请求发送给服务网络 SGSN,所述服务网络 SGSN发送 PS 域业务切换请求给所述 HO-Proxy; 或， 所述服务网络基站系统将所述 CS 域业务切换请求发送给服务网络 MSC ,所述服务网络 MSC发送 CS域业务 切换请求给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS域业 务切换请求发送给所述 HO-Proxy。
优选地， 所述 HO-Proxy将所述 UE的 CS域业务切换到目标网络的 PS 域具体为：
所述 UE没有 PS域业务时， 所述 HO-Proxy向为所述 UE建立承载的 服务网络 SGSN或目标网络控制实体询问承载信息， 执行 PS域切换操作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务； 或，
所述 UE有 PS域业务时 , 所述 HO-Proxy执行 PS域切换操作 , 并使用 所述 UE建立的承载服务所述 UE原来在 CS域上的业务。
优选地， 所述目标网络控制实体为 MME或 SGSN, 所述 HO-Proxy为 MSC或 SGSN或目标网络控制实体。
一种电路交换域业务切换到分组交换域的系统， 包含服务网络基站系 统、 目标网络控制实体、 用于向目标网络的 PS域切换的 HO-Proxy; 其中， 服务网络基站系统，用于决定将 UE的 CS域业务切换到目标网络的 PS 域时， 生成所述 UE的 CS域业务切换请求并发送至所述 HO-Proxy;
所述 HO-Proxy, 用于在接收到所述 UE的 CS域业务切换请求后， 请 求目标网络控制实体将所述 UE的 CS域业务切换到目标网络的 PS域， 或 将所述 UE的 CS域业务切换到目标网络的 PS域。
优选地， 所述系统还包括用户设备（UE ), 所述 UE, 用于在所述服务 网络基站系统决定将所述 UE的 CS域业务切换到目标网络的 PS域之前， 通过 IMS网络在服务网络或目标网络建立承载， 或， 发起 IMS会话， 或， 直接在服务网络或目标网络建立承载。
优选地， 在所述 HO-Proxy请求目标网络控制实体将所述 UE的 CS域 业务切换到目标网络的 PS域，或所述 HO-Proxy将所述 UE的 CS域业务切 换到目标网络的 PS域之前，所述 HO-Proxy还用于关联所述 UE的 PS域业 务切换请求和所述 UE的 CS域业务切换请求。
优选地， 所述服务网络基站系统还用于， 在所述 UE的 CS域业务切换 请求中携带有所述 UE是否具有 PS域业务的标识信息。
优选地， 所述 UE还具有 PS 域业务， 所述服务网络还用于， 将所述 UE的 PS域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy进一步请求目标网络控制实体， 将所述 UE的 CS域和 PS域业务切换到目标网络的 PS域， 或所述 HO-Proxy进一步将所述 UE的 CS域业务和 PS域业务切换到目标网络的 PS域。
优选地， 所述服务网络基站系统发送的所述 UE的 PS域业务切换请求 中携带有指示所述 UE具有 CS域业务的标识信息。
优选地， 所述 HO-Proxy进一步用于， 在接收到所述 UE的 PS域业务 切换请求时， 确定所述 UE还具有 CS域业务。
优选地， 所述 HO-Proxy进一步用于， 在接收到所述 UE的 PS域业务 切换请求时， 根据所述 PS域业务切换请求中的 CS域业务的标识信息确定 所述 UE还具有 CS域业务。
优选地， 所述 HO-Proxy进一步用于， 在接收到所述 UE的 CS域业务 切换请求时， 根据所述 CS域业务切换请求中的是否具有 PS域业务的标识 信息确定所述 UE是否还具有 PS域业务。
优选地， 所述服务网络基站系统进一步用于， 在所述 CS域业务切换请 求中携带能关联到所述 HO-Proxy的信息，并发送所述 CS域业务切换请求； 或者， 将所述 CS域业务切换请求发送给所述 HO-Proxy; 或者， 将所述 CS 域业务切换请求发送给服务网络 MSC ,所述服务网络 MSC发送 CS域业务 切换请求给所述 HO-Proxy。 优选地， 所述服务网络基站系统进一步用于， 在所述 CS域业务切换请 求和所述 PS域业务切换请求中携带能关联到所述 HO-Proxy的信息， 并发 送所述 CS域业务切换请求和 /或所述 PS域业务切换请求； 或者， 将所述 CS域业务切换请求发送给所述 HO-Proxy,并且，所述服务网络基站系统将 所述 PS域业务切换请求发送给服务网络 SGSN, 所述服务网络 SGSN发送 PS域业务切换请求给所述 HO-Proxy; 或者， 将所述 CS域业务切换请求发 送给服务网络 MSC, 所述服务网络 MSC发送 CS域业务切换请求给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS域业务切换请求发送给 所述 HO-Proxy。
优选地， 所述 UE没有 PS域业务时， 所述 HO-Proxy进一步向为所述 UE建立承载的服务网络 SGSN 或目标网络控制实体询问承载信息， 执行 PS域切换操作，并使用所述 UE建立的承载服务所述 UE原来在 CS域上的 业务；
或者， 所述 UE有 PS域业务， 所述 HO-Proxy进一步执行 PS域切换操 作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务。
本发明中， 当服务网络确定需要将具有 CS域业务的 UE切换到 PS网 络时， 服务网络将会将 CS域业务切换请求转发至 HO-Proxy, 还可以将 PS 域业务切换请求转发至 HO-Proxy, 由 HO-Proxy请求目标网络控制实体将 CS域业务切换到 PS网络， 或 HO-Proxy将 CS域业务切换到 PS网络。 也 就是说， 本发明通过 HO-Proxy, 来处理 CS 域业务到 PS 网络的切换。 HO-Proxy可位于 MSC或 SGSN或目标网络控制实体中。 HO-Proxy用于 CS域业务至 PS网络的切换时， 能为 UE的相应业务（ CS域业务和 /或 PS 域业务） 准确地预留 PS的承载资源， 从而实现准确及时的切换。 附图说明
图 1 为本发明电路交换域业务切换到分组交换域的方法实施例一的流 程图；
图 2为本发明电路交换域业务切换到分组交换域的方法实施例二的流 程图。 具体实施方式
本发明的基本思想是， 当服务网络确定需要将具有 CS域业务的 UE切 换到 PS网络时， 服务网络将会将 CS域业务切换请求和 /或 PS域业务切换 请求转发至 HO-Proxy, 由 HO-Proxy执行 CS域业务到 PS网络的切换。
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。
实施例一
图 1 为本发明电路交换域业务切换到分组交换域的方法实施例一的流 程图， 如图 1所示， 本示例的应用场景是， UE-1通过 CS域和 UE-2建立了 通话， UE-1可能还有其他非语音的 PS域业务， 当 UE-1移动到目标网（ PS 网络）需要将所有业务都切换到目标网的 PS域提供， 本示例的电路交换域 业务切换到分组交换域的方法具体包括以下步骤：
步骤 100, 此步骤为可选， 可选的， UE-1请求服务网络建立 PS承载， 比如通过发送 Bearer Resources Command消息 , 或通过 IMS网络与月良务网 络的交互实现承载建立， 比如发起 IMS 会话或在 IMS 注册过程中告知 P-CSCF需要建立承载并由 P-CSCF与服务网络交互实现承载建立， 该步骤 可发生在切换前任何时候， 如果 UE-1先接入目标网络， 也可在目标网络建 立承载， 此时是通过目标网络基站系统和目标网络控制实体建立承载的， 此种情况下， UE-1移动到服务网络后再建立 CS业务， 而后再执行后续步 骤。
步骤 101 , UE-1 向为其服务的网络发送测量报告， 以上报小区信号强 度测量信息。 步骤 102 , 为 UE-1服务的网络的基站子系统根据 UE-1的测量报告中 各小区信号强度测量信息判断目标小区所在的目标网络 PS 域更适合为 UE-1服务， 于是决定执行切换操作， 服务网络的基站子系统向 MSC发送 切换请求， 比如发送切换请求（ Handover required )消息， 切换请求消息的 目标标识（target ID )可以设置为可被所述服务网络的各网元（比如 MSC ) 将所述切换请求路由到所述 HO-Proxy的目标标识； 如果 UE-1还有 PS业 务， 切换请求消息中还携带有指示 "有 PS业务" 的信息， 比如在 target ID 中携带。切换代理可以包含在服务网络的 MSC中或 SGSN中或目标网络控 制实体中。
步骤 103 , MSC向 HO-Proxy发送切换请求消息， HO-Proxy在另一 MSC 中时， 比如发送 Prep HO Request消息，切换请求消息的 target ID为收到的 切换请求消息 （ Handover required ) 的 target ID (即指向 HO-Proxy ), 切换 请求消息携带有指示 "有 PS业务"的信息，比如在 target ID中携带， HO-Proxy 在 SGSN或目标网络的控制网元中时，比如发送 CS to PS HO Request消息， 其中 HO-Proxy在 MME中时 target ID也指向 HO-Proxy (此 target ID不一 定是收到的切换请求消息 （ Handover required ) 的 target ID, 而可以是根据 收到的切换请求消息携带的 target ID或其他字段信息得来），在 SGSN中时 MSC可以， 比如， 根据配置或连接关系确定 HO-Proxy, HO-Proxy在 MME 中时切换请求消息携带有指示 "有 PS业务" 的信息， 比如在 target ID中携 带。
当然，如果 HO-Proxy包含于此 MSC中 ,则发送给此 MSC的 Handover required消息即同时发送给了 HO-Proxy, 则流程中将不再有步骤 103。
步骤 104, HO-Proxy收到来自 CS域的切换请求消息（即来自 MSC或 HO-Proxy包含在 MSC中时还可以是来自基站子系统）， 如果切换请求消息 中携带有指示 "有 PS业务" 的信息， 则等待来自 PS域的切换请求消息， 如果 HO-Proxy在 SGSN中， 则 HO-Proxy可知用户是否有 PS业务而无需 根据指示信息判断。
步骤 105 , 如果 UE-1还有 PS域的数据业务， 则服务网络的基站子系 统还会向服务网络的数据域控制实体（也即 SGSN )发送切换请求消息， 比 如发送 Relocation Required消息， 切换请求消息的目标标识（ target ID )可 以设置为能被所述服务网络的各网元（比如 SGSN )将所述切换请求路由到 所述 HO-Proxy的目标标识， 切换请求消息中可携带有指示 "有 CS业务" 的信息， 比如在 target ID中携带。
target ID的部分信息可以用于表示当前的切换是 PS及 CS切换到 PS(即 指示 "有 CS业务"）， 比如通过 target ID中的位置区域标识（ LAI, Location Area Identity )或无线区域标识 ( RAI , Routing Area Identity )来指示， 例如 通过特定的 LAI或 RAI来标识当前的切换是 PS及 CS切换到 PS。 当然， 也可以通过在相应的请求消息中设置专用的切换指示标识来指示。
当 HO-Proxy先收到来自 PS域的切换请求后， 如果 HO-Proxy在 MSC 中， 因正常的 PS域到 PS域的切换请求不会到达 HO-Proxy, HO-Proxy可 据此判断还要等待来自 CS域的切换请求， 或当 HO-Proxy判断收到的来自 PS域的切换请求带 "有 CS业务" 的信息时等待来自 CS域的切换请求， 或 当 HO-Proxy先收到来自 CS域的切换请求， 则可根据 CS域切换请求中携 带的 "有 PS业务" 的信息等待来自 PS域的切换请求， 从而实现关联 PS 域与 CS域的切换请求。
当然， 本发明也可以在 PS域业务的切换请求及 CS域业务的切换请求 中均设置同时切换 CS域业务及 PS域业务的标识信息； 这样， 无论是 PS 域业务的切换请求先被 HO-Proxy接收到， 还是 CS域业务的切换请求先被 HO-Proxy接收到， HO-Proxy 均可通过所接收到的切换请求中是否携带有 PS及 CS切换到 PS的标识来确定是否是将 UE的 CS域业务及 PS域业务同 时切换到目标网络的 PS域。 也就是说， HO-Proxy判断所接收到的切换请 求中携带有同时切换 CS域业务及 PS域业务的标识信息时， 确认接收到所 述 UE的 CS域业务的切换请求及 PS域业务的切换请求后， 向所述目标网 络的相应网元发送切换请求， 否则等待另一切换请求。
步骤 106 , SGSN向 HO-Proxy发送切换请求消息， HO-Proxy在目标网 络控制网元中或与步骤 102 中的 MSC 不同的另一 MSC 中时， 比如发送 Forward Relocation Request消息，切换请求消息的 target ID为收到的切换请 求消息的 target ID (即指向 HO-Proxy ), HO-Proxy在步骤 103中的 MSC中 时， SGSN可以， 比如， 根据配置或连接关系确定 HO-Proxy。
当然， 如果 HO-Proxy 包含于此 SGSN 中， 则发送给此 SGSN 的
Relocation Required消息即同时发送给了 HO-Proxy , 则流程中将不再有步 骤 106。
步骤 107, HO-Proxy关联来自 CS域与 PS域的切换请求消息中的信息， 即釆用步骤 105中描述的方法关联来自 CS域与 PS域的切换请求， 如果有 来自两个域的切换请求消息， 则根据其中的相关信息以生成目标网络能识 别的对应信息并合并在一起作为步骤 109中的切换请求消息的参数。
步骤 108 , 如果没有执行步骤 100 , 本步骤为可选步骤， 可选地， HO-Proxy 向数据网络网关 （即 SGW ( Serving Gateway )和 PGW ( PDN Gateway ) ) 申请建立语音 载 , 比^口发送 Bearer Resource Command, ^口果 执行了步骤 100, 本步骤亦为可选步骤， 可选地， HO-Proxy向为 UE-1建立 承载的服务网络 SGSN或目标网络控制实体询问承载信息， 比如发送 PDP Context Request消息, 从而获得 载信息。
步骤 109, 如果执行了步骤 108的步骤， 则在步骤 108之后， 如果未执 行步骤 108 , 则在步骤 107之后， 如果 HO-Proxy不在目标网络的控制实体 中， 则 HO-Proxy向目标网络的控制实体， 即长期演进（LTE, Long Term Evolution ) 网络的移动管理实体（MME, Mobile Management Entity )或高 速数据访问 （HSPA, High Speed Packet Access ) 网络的 SGSN发送切换请 求， 比如发送 CS to PS Handover Request消息， 如果 HO-Proxy在目标网络 的控制实体中， 则没有步骤 109了， 如果 HO-Proxy获得了承载信息， 则切 换请求中携带获得的承载信息。
步骤 110, 如果 HO-Proxy未执行步骤 100且未执行步骤 108的步骤， 则目标网络控制实体或 HO-Proxy (如果 HO-Proxy在目标网络控制实体中） 请求建立语音承载， 比如发送 Bearer Resource Command, 如果执行了步骤 100, 则目标网络控制实体或 HO-Proxy (如果 HO-Proxy在目标网络控制实 体中）向为 UE-1建立承载的服务网络 SGSN或目标网络控制实体询问承载 信息， 比如发送 PDP Context Request消息， 从而获得承载信息。
步骤 111 , 目标网络控制实体向目标网络基站子系统发送切换请求， 比 如发送 Handover Request消息。
步骤 112, 目标网络基站子系统回应切换响应消息， 比如发送 Handover Request Acknowledge消息。
步骤 113 , 目标网络控制实体收到切换响应后， 向 HO-Proxy发送切换 响应消息， 比如发送 CS to PS Handover Response消息。
步骤 114, HO-Proxy向服务网络的 MSC发送切换响应消息， 比如发送 Prep HO Response消息；
步骤 115 , 服务网络的 MSC向服务网络基站子系统发送切换命令， 比 如发送 Handover Command (切换命令 ) 消息；
步骤 116,如果 UE-1还有数据业务，则 HO-Proxy还会向服务网络 SGSN 发送切换响应， 比如发送 Forward Relocation Response消息；
步骤 117,服务网络 SGSN向服务网络基站子系统发送切换命令， 比如 发送 Relocation Command消息； 步骤 118, 服务网络基站子系统合并两个切换命令， 向 UE-1发送切换 到目标网络的消息， 比如发送 HO from UTRAN/GERAN消息；
步骤 119, UE-1执行切换， 调制到目标网络中；
至此， UE-1通过目标网络的 PS域提供业务，包括语音业务，使得 UE-1 原本在 CS域的语音业务能继续在目标网络的 PS域提供。
实施例二
图 2为本发明电路交换域业务切换到分组交换域的方法实施例二的流 程图， 如图 2所示， 本示例的应用场景是， UE-1通过 CS域和 UE-2建立了 通话， UE-1可能还有其他非语音的 PS域业务， 当 UE-1移动到目标网（ PS 网络）需要将所有业务都切换到目标网的 PS域提供， 本示例的电路交换域 业务切换到分组交换域的方法具体包括以下步骤：
步骤 200, 此步骤为可选， 可选的， UE-1请求服务网络建立 PS承载， 比如通过发送 Bearer Resources Command消息 , 或通过 IMS网络与月良务网 络的交互实现承载建立， 比如发起 IMS 会话或在 IMS 注册过程中告知 P-CSCF需要建立承载并由 P-CSCF与服务网络交互实现承载建立， 该步骤 可发生在切换前任何时候， 如果 UE-1先接入目标网络， 也可在目标网络建 立承载， 此时是通过目标网络基站系统和目标网络控制实体建立承载的， 此种情况下， UE-1移动到服务网络后再建立 CS业务， 而后再执行后续步 骤。
步骤 201 , UE-1 向为其服务的网络发送测量报告， 以上报小区信号强 度测量信息。
步骤 202, 为 UE-1服务的网络的基站子系统根据测量报告中各小区信 号强度测量信息判断附近的 PS目标网络更适合为 UE-1服务， 于是决定执 行切换操作， 服务网络的基站子系统向 SGSN发送切换请求， 比如发送 Relocation required消息， 切换请求消息的目标标识可以设置为能被所述服 务网络的各网元（比如 SGSN )将所述切换请求路由到所述 HO-Proxy的目 标标识，切换请求消息中可携带有指示 "有 CS业务"的信息， 比如在 target ID中携带， 切换代理可以包含在 MSC中或 SGSN中或目标网络控制实体 中。
步骤 203 , SGSN向 HO-Proxy发送切换请求消息， HO-Proxy在目标网 络控制网元中或与步骤 205 中的 MSC 不同的另一 MSC 中时， 比如发送 Forward Relocation Request消息，切换请求消息的 target ID为收到的切换请 求消息的 target ID (即指向 HO-Proxy ), HO-Proxy在步骤 205中的 MSC中 时， SGSN可以， 比如， 根据配置或连接关系确定 HO-Proxy;
当然，如果 HO-Proxy包含于此 SGSN中，则发送给此 SGSN的 Forward
Relocation Request消息即同时发送给了 HO-Proxy, 则流程中将不再有步骤 203。
target ID的部分信息可以用于表示当前的切换是 PS及 CS切换到 PS(即 指示 "有 CS业务"）， 比如通过 target ID中的位置区域标识（LAI, Location Area Identity )或无线区域标识 ( RAI , Routing Area Identity )来指示， 例如 通过特定的 LAI或 RAI来标识当前的切换是 PS及 CS切换到 PS。 当然， 也可以通过在相应的请求消息中设置专用的切换指示标识来指示。
当 HO-Proxy先收到来自 PS域的切换请求后， 如果 HO-Proxy在 MSC 中， 因正常的 PS域到 PS域的切换请求不会到达 HO-Proxy, HO-Proxy可 据此判断还要等待来自 CS域的切换请求， 或当 HO-Proxy判断收到的来自 PS域的切换请求带 "有 CS业务" 的信息时等待来自 CS域的切换请求， 或 当 HO-Proxy先收到来自 CS域的切换请求， 则可根据 CS域切换请求中携 带的 "有 PS业务" 的信息等待来自 PS域的切换请求， 从而实现关联 PS 域与 CS域的切换请求。
当然， 本发明也可以在 PS域业务的切换请求及 CS域业务的切换请求 中均设置同时切换 CS域业务及 PS域业务的标识信息； 这样， 无论是 PS 域业务的切换请求先被 HO-Proxy接收到， 还是 CS域业务的切换请求先被 HO-Proxy接收到， HO-Proxy 均可通过所接收到的切换请求中是否携带有 PS及 CS切换到 PS的标识来确定是否是将 UE的 CS域业务及 PS域业务同 时切换到目标网络的 PS域。 也就是说， HO-Proxy判断所接收到的切换请 求中携带有同时切换 CS域业务及 PS域业务的标识信息时， 确认接收到所 述 UE的 CS域业务的切换请求及 PS域业务的切换请求后， 向所述目标网 络的相应网元发送切换请求， 否则等待另一切换请求。
步骤 204, HO-Proxy收到来自 PS域的切换请求消息， 则等待来自 CS 域的切换请求消息。
步骤 205 , 服务网络的基站子系统还向 MSC发送切换请求 （即 CS域 的切换请求消息）， 比如发送 Handover required消息， 切换请求消息的目标 标识可以设置为能被所述服务网络的各网元（比如 MSC )将所述切换请求 路由到所述 HO-Proxy的目标标识， 如果 UE-1还有 PS业务， 切换请求消 息中还携带有指示 "有 PS业务" 的信息， 比如在 target ID中携带， 切换代 理可以包含在 MSC中或 SGSN中或目标网络的控制实体中，如果 HO-Proxy 在 SGSN中， 则 HO-Proxy可知用户是否有 PS业务而无需根据指示信息判 断；
步骤 206, MSC向 HO-Proxy发送切换请求消息， HO-Proxy在另一 MSC 中时， 比如发送 Prep— HO Request , 切换请求消息的 target ID为收到的切换 请求消息的 target ID, 切换请求消息携带有指示 "有 PS业务" 的信息， 比 如在 target ID中携带， HO-Proxy在 SGSN或目标网络的控制网元中时， 比 如发送 CS to PS HO Request消息，其中 HO-Proxy在 MME中时 target ID(此 target ID不一定是收到的切换请求消息 （ Handover required ) 的 target ID, 而可以是根据收到的切换请求消息携带的 target ID或其他字段信息得来） 也指向 HO-Proxy, 在 SGSN中时 MSC可以， 比如， 居配置或连接关系 确定 HO-Proxy, HO-Proxy在 MME中时切换请求消息携带有指示 "有 PS 业务" 的信息， 比如在 target ID中携带；
当然，如果 HO-Proxy包含于此 MSC中 ,则发送给此 MSC的 Handover required消息即同时发送给了 HO-Proxy, 则流程中将不再有步骤 206。
步骤 207~219, 与前述图 1的步骤 107~119完全相同。
至此， UE-1通过目标网络的 PS域提供业务，包括语音业务，使得 UE-1 原本在 CS域的语音业务能继续在目标网络的 PS域提供。 需要注意的是， 本发明所称的 "关联" 也可称为 "同步"。
本发明同时记载了一种电路交换域业务切换到分组交换域的系统， 包 含服务网络基站系统、 目标网络控制实体、 用于向目标网络的 PS域切换的 HO-Proxy; 本领域技术人员应当理解， 上述的服务网络以及目标网络均是 以处于切换状态的 UE而言的， 上述网络均为现有网络， 因此， 本发明电路 交换域业务切换到分组交换域的系统的结构是清楚的， 不再图示。 只是， 上述网络中的一些网元与现有网元所执行的功能有所不同， 即本发明技术 方案所涉及的网元中， 增设有以下相应的功能， 以下详细描述之。
服务网络基站系统，用于决定将 UE的 CS域业务切换到目标网络的 PS 域时， 生成所述 UE的 CS域业务切换请求并发送至所述 HO-Proxy;
所述 HO-Proxy, 用于在接收到所述 UE的 CS域业务切换请求后， 请 求目标网络控制实体将所述 UE的 CS域业务切换到目标网络的 PS域， 或 将所述 UE的 CS域业务切换到目标网络的 PS域。
上述系统还包括 UE, 所述 UE, 用于在所述服务网络基站系统决定将 所述 UE的 CS域业务切换到目标网络的 PS域之前， 通过 IMS网络在服务 网络或目标网络建立承载， 或， 发起 IMS会话， 或， 直接在服务网络或目 标网络建立 载。 在所述 HO-Proxy请求目标网络控制实体将所述 UE的 CS域业务切换 到目标网络的 PS域，或所述 HO-Proxy将所述 UE的 CS域业务切换到目标 网络的 PS域之前，所述 HO-Proxy还用于关联所述 UE的 PS域业务切换请 求和所述 UE的 CS域业务切换请求。
上述服务网络基站系统还用于， 在所述 UE的 CS域业务切换请求中携 带有所述 UE是否具有 PS域业务的标识信息。
上述 UE还具有 PS域业务时， 所述服务网络还用于， 将所述 UE的 PS 域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy进一步请求目标网络控制实体， 将所述 UE的 CS域和 PS域业务切换到目标网络的 PS域， 或所述 HO-Proxy进一步将所述 UE的 CS域业务和 PS域业务切换到目标网络的 PS域。
上述服务网络基站系统发送的所述 UE的 PS域业务切换请求中携带有 指示所述 UE具有 CS域业务的标识信息。
上述 HO-Proxy进一步用于， 在接收到所述 UE的 PS域业务切换请求 时， 确定所述 UE还具有 CS域业务。
上述 HO-Proxy进一步用于， 在接收到所述 UE的 PS域业务切换请求 时， 根据所述 PS域业务切换请求中的 CS域业务的标识信息确定所述 UE 还具有 CS域业务。
上述 HO-Proxy进一步用于， 在接收到所述 UE的 CS域业务切换请求 时， 根据所述 CS域业务切换请求中的是否具有 PS域业务的标识信息确定 所述 UE是否还具有 PS域业务。
上述服务网络基站系统进一步用于，在所述 CS域业务切换请求中携带 能关联到所述 HO-Proxy的信息， 并发送所述 CS域业务切换请求； 或者， 将所述 CS域业务切换请求发送给所述 HO-Proxy; 或者，将所述 CS域业务 切换请求发送给服务网络 MSC ,所述服务网络 MSC发送 CS域业务切换请 求给所述 HO-Proxy。
上述服务网络基站系统进一步用于，在所述 CS域业务切换请求和所述 PS域业务切换请求中携带能关联到所述 HO-Proxy的信息， 并发送所述 CS 域业务切换请求和 /或所述 PS域业务切换请求； 或者， 将所述 CS域业务切 换请求发送给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS域 业务切换请求发送给服务网络 SGSN, 所述服务网络 SGSN发送 PS域业务 切换请求给所述 HO-Proxy; 或者， 将所述 CS域业务切换请求发送给服务 网络 MSC,所述服务网络 MSC发送 CS域业务切换请求给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS 域业务切换请求发送给所述 HO-Proxy„
上述 UE没有 PS域业务时， 所述 HO-Proxy进一步向为所述 UE建立 承载的服务网络 SGSN或目标网络控制实体询问承载信息，执行 PS域切换 操作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务； 或者， 所述 UE有 PS域业务时， 所述 HO-Proxy进一步执行 PS域切换 操作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种电路交换域业务切换到分组交换域的方法， 设置用于向目标网 络的分组交换（PS )域切换的切换代理（HO-Proxy ); 其特征在于， 所述方 法包括：
服务网络基站系统决定将用户设备 ( UE )的电路交换（CS )域业务切 换到目标网络的 PS域时， 将所述 UE 的 CS域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy请求目标网络控制实体将所述 UE的 CS域业务切换到 目标网络的 PS域，或所述 HO-Proxy将所述 UE的 CS域业务切换到目标网 络的 PS域。
2、 根据权利要求 1所述的方法， 其特征在于， 在所述服务网络基站系 统决定将所述 UE的 CS域业务切换到目标网络的 PS域之前还包括：
所述 UE通过 IP多媒体子系统（ IMS ) 网络在月良务网络或目标网络建 立承载， 或， 发起 IMS会话， 或， 直接在服务网络或目标网络建立承载。
3、 根据权利要求 1所述的方法， 其特征在于， 在所述 HO-Proxy请求 目标网络控制实体将所述 UE的 CS域业务切换到目标网络的 PS域， 或所 述 HO-Proxy将所述 UE的 CS域业务切换到目标网络的 PS域之前还包括： 所述 HO-Proxy关联所述 UE的 PS域业务切换请求和所述 UE的 CS域 业务切换请求。
4、 根据权利要求 1或 3所述的方法， 其特征在于， 所述 UE的 CS域 业务切换请求中携带有指示所述 UE是否具有 PS域业务的标识信息。
5、 根据权利要求 1或 3所述的方法， 其特征在于， 所述方法还包括： 所述 UE还具有 PS域业务时，所述服务网络基站系统将所述 UE的 PS 域业务切换请求发送至所述 HO-Proxy;
所述 HO-Proxy请求目标网络控制实体将所述 UE的所述 CS域和所述 PS域业务切换到目标网络的 PS域，或所述 HO-Proxy将所述 UE的所述 CS 域业务和所述 PS域业务切换到目标网络的 PS域。
6、 根据权利要求 5所述的方法， 其特征在于， 所述方法还包括： 所述服务网络基站系统发送的所述 UE的 PS域业务切换请求中携带有 指示所述 UE具有 CS域业务的标识信息。
7、 根据权利要求 3所述的方法， 其特征在于， 所述 HO-Proxy关联所 述 UE的 PS域业务切换请求和所述 UE的 CS域业务切换请求， 具体为： 所述 HO-Proxy在接收到所述 UE的 PS域业务切换请求时， 确定所述 UE还具有 CS域业务。
8、 根据权利要求 4所述的方法， 其特征在于， 所述 HO-Proxy关联所 述 UE的 PS域业务切换请求和所述 UE的 CS域业务切换请求， 具体为： 所述 HO-Proxy在接收到所述 UE的 CS域业务切换请求时， 根据所述 CS域业务切换请求中的是否具有 PS域业务的标识信息确定所述 UE是否 还具有 PS域业务。
9、 根据权利要求 6所述的方法， 其特征在于， 所述 HO-Proxy关联所 述 UE的 PS域业务切换请求和所述 UE的 CS域业务切换请求， 具体为： 所述 HO-Proxy在接收到所述 UE的 PS域业务切换请求时， 根据所述 PS域业务切换请求中的 CS域业务的标识信息确定所述 UE还具有 CS域业 务。
10、 根据权利要求 1 所述的方法， 其特征在于， 所述服务网络基站系 统将所述 UE的 CS域业务切换请求发送至所述 HO-Proxy具体为：
所述服务网络基站系统在所述 CS 域业务切换请求中携带能关联到所 述 HO-Proxy的信息， 并发送所述 CS域业务切换请求； 或， 所述服务网络 基站系统将所述 CS域业务切换请求发送给所述 HO-Proxy; 或， 所述服务 网络基站系统将所述 CS域业务切换请求发送给服务网络 MSC, 所述服务 网络 MSC发送 CS域业务切换请求给所述 HO-Proxy。
11、 根据权利要求 5 所述的方法， 其特征在于， 服务网络基站系统将 所述 UE的 CS域业务切换请求和 PS域业务切换请求发送至所述 HO-Proxy 具体为：
所述服务网络基站系统在所述 CS域业务切换请求和所述 PS域业务切 换请求中携带能关联到所述 HO-Proxy的信息， 并发送所述 CS域业务切换 请求和 /或所述 PS域业务切换请求； 或， 所述服务网络基站系统将所述 CS 域业务切换请求发送给所述 HO-Proxy, 并且， 所述服务网络基站系统将所 述 PS域业务切换请求发送给服务网络 SGSN,所述服务网络 SGSN发送 PS 域业务切换请求给所述 HO-Proxy; 或， 所述服务网络基站系统将所述 CS 域业务切换请求发送给服务网络 MSC ,所述服务网络 MSC发送 CS域业务 切换请求给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS域业 务切换请求发送给所述 HO-Proxy。
12、 根据权利要求 2所述的方法， 其特征在于， 所述 HO-Proxy将所述 UE的 CS域业务切换到目标网络的 PS域具体为：
所述 UE没有 PS域业务时， 所述 HO-Proxy向为所述 UE建立承载的 服务网络 SGSN或目标网络控制实体询问承载信息， 执行 PS域切换操作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务；
或者 , 所述 UE有 PS域业务时 , 所述 HO-Proxy执行 PS域切换操作 , 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务。
13、 根据权利要求 1 所述的方法， 其特征在于， 所述目标网络控制实 体为 MME或 SGSN, 所述 HO-Proxy为 MSC或 SGSN或目标网络控制实 体。
14、 一种电路交换域业务切换到分组交换域的系统， 包含服务网络基 站系统、 目标网络控制实体、 用于向目标网络的 PS域切换的 HO-Proxy; 其特征在于，
服务网络基站系统，用于决定将 UE的 CS域业务切换到目标网络的 PS 域时， 生成所述 UE的 CS域业务切换请求并发送至所述 HO-Proxy;
所述 HO-Proxy, 用于在接收到所述 UE的 CS域业务切换请求后， 请 求目标网络控制实体将所述 UE的 CS域业务切换到目标网络的 PS域， 或 将所述 UE的 CS域业务切换到目标网络的 PS域。
15、 根据权利要求 14所述的系统， 其特征在于，
所述系统还包括用户设备（UE ), 所述 UE, 用于在所述服务网络基站 系统决定将所述 UE的 CS域业务切换到目标网络的 PS域之前， 通过 IMS 网络在服务网络或目标网络建立承载， 或， 发起 IMS会话， 或， 直接在服 务网络或目标网络建立承载。
16、 根据权利要求 14所述的系统， 其特征在于， 在所述 HO-Proxy请 求目标网络控制实体将所述 UE的 CS域业务切换到目标网络的 PS域， 或 所述 HO-Proxy将所述 UE的 CS域业务切换到目标网络的 PS域之前，所述 HO-Proxy还用于关联所述 UE的 PS域业务切换请求和所述 UE的 CS域业 务切换请求。
17、 根据权利要求 14或 16所述的系统， 其特征在于， 所述服务网络 基站系统还用于， 在所述 UE的 CS域业务切换请求中携带有所述 UE是否 具有 PS域业务的标识信息。
18、根据权利要求 14或 16所述的系统， 其特征在于， 所述 UE还具有 PS域业务时， 所述服务网络还用于，将所述 UE的 PS域业务切换请求发送 至所述 HO-Proxy;
所述 HO-Proxy进一步请求目标网络控制实体， 将所述 UE的 CS域和 PS域业务切换到目标网络的 PS域， 或所述 HO-Proxy进一步将所述 UE的 CS域业务和 PS域业务切换到目标网络的 PS域。
19、 根据权利要求 18所述的系统， 其特征在于， 所述服务网络基站系 统发送的所述 UE的 PS域业务切换请求中携带有指示所述 UE具有 CS域 业务的标识信息。
20、 根据权利要求 16所述的系统， 其特征在于， 所述 HO-Proxy进一 步用于， 在接收到所述 UE的 PS域业务切换请求时， 确定所述 UE还具有 CS域业务。
21、 根据权利要求 17所述的系统， 其特征在于， 所述 HO-Proxy进一 步用于， 在接收到所述 UE的 CS域业务切换请求时， 根据所述 CS域业务 切换请求中的是否具有 PS域业务的标识信息确定所述 UE是否还具有 PS 域业务。
22、 根据权利要求 19所述的系统， 其特征在于， 所述 HO-Proxy进一 步用于， 在接收到所述 UE的 PS域业务切换请求时， 根据所述 PS域业务 切换请求中的 CS域业务的标识信息确定所述 UE还具有 CS域业务。
23、 根据权利要求 14所述的系统， 其特征在于， 所述服务网络基站系 统进一步用于， 在所述 CS域业务切换请求中携带能关联到所述 HO-Proxy 的信息， 并发送所述 CS域业务切换请求； 或者， 将所述 CS域业务切换请 求发送给所述 HO-Proxy; 或者， 将所述 CS域业务切换请求发送给服务网 络 MSC , 所述服务网络 MSC发送 CS域业务切换请求给所述 HO-Proxy。
24、 根据权利要求 18所述的系统， 其特征在于， 所述服务网络基站系 统进一步用于， 在所述 CS域业务切换请求和所述 PS域业务切换请求中携 带能关联到所述 HO-Proxy的信息，并发送所述 CS域业务切换请求和 /或所 述 PS 域业务切换请求； 或者， 将所述 CS 域业务切换请求发送给所述 HO-Proxy, 并且， 所述服务网络基站系统将所述 PS域业务切换请求发送给 服务网络 SGSN, 所述服务网络 SGSN发送 PS 域业务切换请求给所述 HO-Proxy; 或者， 将所述 CS域业务切换请求发送给服务网络 MSC, 所述 服务网络 MSC发送 CS域业务切换请求给所述 HO-Proxy, 并且， 所述服务 网络基站系统将所述 PS域业务切换请求发送给所述 HO-Proxy。
25、 根据权利要求 15所述的系统， 其特征在于， 所述 UE没有 PS域 业务时， 所述 HO-Proxy进一步向为所述 UE建立 7 载的良务网络 SGSN或 目标网络控制实体询问承载信息， 执行 PS域切换操作， 并使用所述 UE建 立的承载服务所述 UE原来在 CS域上的业务；
或者， 所述 UE有 PS域业务时， 所述 HO-Proxy进一步执行 PS域切换 操作， 并使用所述 UE建立的承载服务所述 UE原来在 CS域上的业务。
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