WO2014008667A1 - 切换到电路交换域的方法、装置和系统 - Google Patents

切换到电路交换域的方法、装置和系统 Download PDF

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Publication number
WO2014008667A1
WO2014008667A1 PCT/CN2012/078630 CN2012078630W WO2014008667A1 WO 2014008667 A1 WO2014008667 A1 WO 2014008667A1 CN 2012078630 W CN2012078630 W CN 2012078630W WO 2014008667 A1 WO2014008667 A1 WO 2014008667A1
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Prior art keywords
domain
msc
srvcc
csfb
location
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PCT/CN2012/078630
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English (en)
French (fr)
Inventor
刘海
吴晓波
戚彩霞
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201280018200.9A priority Critical patent/CN103782629B/zh
Priority to PCT/CN2012/078630 priority patent/WO2014008667A1/zh
Priority to JP2015520790A priority patent/JP6005275B2/ja
Priority to ES12881111.4T priority patent/ES2610824T3/es
Priority to CN201711195875.1A priority patent/CN109089289B/zh
Priority to EP12881111.4A priority patent/EP2874435B1/en
Publication of WO2014008667A1 publication Critical patent/WO2014008667A1/zh
Priority to US14/593,905 priority patent/US9961593B2/en
Priority to US15/944,622 priority patent/US10362513B2/en
Priority to US16/439,888 priority patent/US11026130B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/0024Services and arrangements where telephone services are combined with data services
    • H04M7/0057Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/12Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1225Details of core network interconnection arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224Control 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]
    • H04W36/00226Control 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]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10Architectures or entities
    • H04L65/1046Call controllers; Call servers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M7/00Arrangements for interconnection between switching centres
    • H04M7/006Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP), including next generation networks with a packet-switched transport layer
    • H04M7/0066Details of access arrangements to the networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method, apparatus, and system for switching to a circuit switched domain. Background technique
  • 3GPP (3rd Generation P said the Artnership Project, the third-generation partner project) standards organization has launched a new generation of evolved network architecture, the core network part of which is SAE (System Architecture Evolution) network, access network part It is an LTE (Long Term Evolution) network, also known as E-UTRAN (Evolved Universal Terrestrial Radio Access Network).
  • SAE System Architecture Evolution
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network
  • the E-UTRAN consists of an eNB (evolutional Node B, an evolved base station).
  • the SAE network consists of two parts: the MME (Mobility Management Entity) and the SAE gateway.
  • the SAE gateway includes a Serving Gateway and a PDN Gateway (Packet Data Network).
  • the MME is a control plane node of the core network part, and bears the management function of the UE (User Equipment) context and the user plane bearer.
  • the serving gateway undertakes the transmission function of the user service data
  • the PDN Gateway undertakes the transmission function of the user signaling data. .
  • the UE When the UE is performing VOIP (Voice over Internet Protocol) service on the PS (Packet Switch) domain of the SAE/LTE network, if the CS MT is triggered by the location service of the CS (Circuit Switch) domain
  • the -LR Mobile Terminating Location Request
  • the SRVCC Single Radio Voice Call Continuity
  • the UE that is previously attached to the MSC is notified to provide the location information. In this scenario, if the jointly attached MSC does not have the capability of the SRVCC, the UE cannot complete the location service of the CS domain.
  • the embodiments of the present invention provide a method, an apparatus, and a system for switching to a circuit switched domain, so that a UE performing a VOIP service can correctly switch to a CS domain.
  • the technical solution is as follows:
  • a method of switching to a circuit switched domain including:
  • the location service of the CS-switched CS domain triggers the SRVCC process of the UE, selecting, in the SRVCC process, the CSFB and the SRVCC are supported for the UE in the SRVCC process.
  • the MSC in order to enable the UE to switch to the CS domain, access the MSC and perform CS domain location service.
  • an apparatus for switching to a circuit switched domain comprising:
  • a first selection module configured to select, for the user equipment UE, a mobile switching center MSC that supports both the circuit switched domain fallback CSFB and the single channel wireless voice call continuity SRVCC;
  • a second selection module configured to: when the UE performs the VoIP service of the VoIP service, if the location service of the CS-switched CS domain triggers the SRVCC process of the UE, select the location for the UE in the SRVCC process.
  • the MSC that supports the CSFB and the SRVCC is selected by the first selection module, so that the UE switches to the CS domain, accesses the MSC, and performs CS domain location service.
  • a system for switching to a circuit switched domain comprising a UE and means for switching to a circuit switching domain as described above;
  • the UE in the process of performing a VoIP service of the VoIP, if the location service of the circuit switched CS domain triggers a single channel wireless voice call continuity SRVCC procedure, then switching to the CS domain accessing the device selection It supports both the circuit switched domain back-off CSFB and the SRVCC-enabled mobile switching center MSC and performs CS domain location services.
  • the CSVCC process selects both the CSFB and the SRVCC.
  • the MSC ensures that the UE can correctly access the CSFB supporting the CSFB, thereby performing location services in the CS domain, and solving the MSC in the prior art that the MME chooses not to support in the joint attachment.
  • FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present invention.
  • FIG. 2 is a flowchart of a method for switching to a circuit switched domain according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for switching to a circuit switched domain according to another embodiment of the present invention
  • 4 is a schematic diagram of a joint attachment process according to still another embodiment of the present invention
  • FIG. 5 is a schematic diagram of a SRVCC process triggered by a location service according to still another embodiment of the present invention.
  • FIG. 6 is a flowchart of a method for switching to a circuit switched domain according to another embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a joint location update process according to still another embodiment of the present invention.
  • FIG. 8 is a structural diagram of an apparatus for switching to a circuit switched domain according to still another embodiment of the present invention.
  • FIG. 9 is a structural diagram of a system for switching to a circuit switched domain according to another embodiment of the present invention. detailed description
  • FIG. 1 is a schematic diagram of a network architecture applied to an embodiment of the present invention.
  • the 2G network is GE AN (GSM EDGE Radio Access Network, GSM EDGE Radio Access Network), and the 3G network is UTRAN (UMTS Terrestrial Radio Access Network).
  • the MSC may also be referred to as an MSC Server server. For convenience of description, it is collectively referred to as an MSC, and is not specifically stated below.
  • voice services are generally carried on the CS domain
  • data services are generally carried on the PS domain.
  • the middle and lower parts of the figure are SAE and LTE networks, including SGSN, MME, HSS (Home Subscriber Server, Home Subscriber Server) and Serving/PDN GW.
  • the SAE/LTE network is a packet switching system carried by the PS domain.
  • the voice service can only be carried on the PS domain, and the voice service is performed by the IMS (IP Multimedia Subsystem, IP Multimedia Subsystem) through the IP bearer-based network. control.
  • the MME provides services for the UE; when the UE is located in the CS domain, the MSC provides services for the UE.
  • the UE switching to the CS domain means that the UE currently in the VOIP service is switched from the PS domain to the CS domain.
  • the embodiment of the present invention further relates to a CSFB technology, where the CSFB technology performs a Joint Attaching (UE) to solve the UE's fallback from the PS domain of the LTE to the CS domain in the 2G/3G.
  • the MME selects an MSC for the UE, so that the UE serves the UE when the UE falls back to the CS domain.
  • an embodiment of the present invention provides a method for switching to a circuit switched domain, including:
  • 201 Select, for the user equipment UE, a mobile switching center MSC that supports both the circuit switched domain fallback CSFB and the single channel wireless voice call continuity SRVCC.
  • the execution body of the above method provided by this embodiment may be an MME.
  • the foregoing method provided in this embodiment selects an MSC that supports both CSFB and SRVCC for the UE, and if the location service of the CS domain triggers the SRVCC process of the UE during the VOIP service of the UE, the SRVCC process is selected in the SRVCC process.
  • the MSC supporting both the CSFB and the SRVCC ensures that the UE can correctly access the MSC supporting the CSFB based on the normal operation of the SRVCC process, thereby performing location services in the CS domain, and solving the problem in the prior art when the MME is in the MME.
  • the UE cannot complete the problem of the CS domain location service when the unsupported MSC is selected in the joint attachment.
  • another embodiment of the present invention provides a method for switching to a circuit switched domain, where the MME selects an MSC that supports both CSFB and SRVCC in the joint attaching process, and the method includes:
  • the MME selects a first MSC for the UE that supports both CSFB and SRVCC.
  • the UE will perform the joint attach process at boot time.
  • the UE is first attached to the MME of the PS domain, and then the MME selects an MSC for the UE, and performs the UE attaching to the MSC, so that the subsequent UE switches to the CS domain, and the MSC provides services for the UE.
  • the process in which this UE is attached to both the MME and the MSC is a joint attach procedure.
  • the MME selects a CS eNB for the UE to support both the CSFB and the SRVCC, so that the UE can correctly switch the CS domain when the SRVCC process is subsequently performed.
  • the MME selects the first MSC in the SRVCC process, so that the UE switches to the CS domain and accesses the first MSC. Perform CS domain location service.
  • the VOIP service is a service of the UE in the PS domain
  • the location service of the CS domain refers to a location service CS MT-LR terminated by the CS domain mobile triggered by the location service of the UE in the CS domain. For example, if the UE receives a call from the CS domain as the called party, the MSC will perform paging in the CS domain for the UE, and request the UE to provide its own location information.
  • the location service of the CS domain triggers the SRVCC process, and the UE can switch from the PS domain to the CS domain through the SRVCC process.
  • the MME also selects an MSC for the UE to provide services for the UE after the UE switches to the CS domain.
  • the MME selects the same MSC selected in the joint attach procedure in the SRVCC procedure. Since the MSC has the capability of supporting both CSFB and SRVCC, it can ensure that the UE correctly switches to the CS domain.
  • the UE accessing the first MSC indicates that the UE has switched to the CS domain, and the MSC Can provide services for the UE.
  • the joint attach process in step 301 may specifically include:
  • the UE sends a joint attach request Combind Attach Request message to the MME, requesting to perform joint attach, where the message includes an indication for indicating joint attach.
  • the MME After receiving the joint attach request message, the MME selects, for the UE, an MSC that supports both CSFB and SRVCC.
  • the MME sends a location update request Location Update Request message to the selected MSC, requesting location update.
  • the MSC After receiving the location update request message sent by the MME, the MSC performs interaction with the HSS to perform location update of the UE in the CS domain.
  • the MSC sends a location update acknowledgement Location Update Accept message to the MME.
  • the MME After receiving the location update acknowledgement message, the MME sends a joint attach confirmation message to the UE, and the joint attach process ends.
  • the MME selects an MSC that supports both CSFB and SRVCC for the UE, thereby avoiding that the selected MSC does not support SRVCC, and the subsequent SRVCC process cannot be performed normally, and the MSC also supports CSFB to enable UE handover.
  • the process to the CS domain can also proceed normally.
  • the location service of the CS domain in step 302 triggers the SRVCC process of the UE performing the VOIP service, which may specifically include:
  • the UE performs VOIP service in the PS domain.
  • the MSC receives the location information request PROVIDE_SUBSCRIBER_LOCATION message because the location service of the CS domain triggers a CS domain mobile terminated location service CS MT-L.
  • the MSC sends a paging request Paging Request message to the MME, and the MME sends a CS paging notification Paging Notification message to the UE, notifies the UE that this is a paging caused by the location service, and sends a service request Service Request message to the MSC.
  • the UE sends an extended service request Extended Service Request message to the MME.
  • the MME determines that the UE accepts the current CS MT-L request, it sends a message to notify the eNodeB, where the message includes a CSFB indication.
  • the eNodeB After receiving the message, the eNodeB sends a response message to the MME, and requests the UE to perform measurement on the 2G/3G network according to the CSFB indication. 504: The eNodeB determines and triggers the execution of the SRVCC process, and performs the UE handover to the 2G/3G network.
  • the MME selects the same MSC selected in the foregoing joint attach process, because the MSC has both CSFB and SRVCC support.
  • the ability to ensure that the MSC connected after the UE switches to the CS domain is the MSC in step 502a, so that the CS location service can continue.
  • the MSC After the UE handover is completed, the MSC sends an LCS (Location Notification Invoke) message to the UE.
  • LCS Location Notification Invoke
  • the UE After receiving the location service, the UE provides the location information to the MSC, and the process ends.
  • the foregoing method provided by this embodiment selects, by the MME, a UE that supports both CSFB and SRVCC.
  • another embodiment of the present invention provides a method for switching to a circuit switched domain, where the MME selects an MSC that supports both CSFB and SRVCC in the joint location update process, and the method includes:
  • the MME sends an IMSI (International Mobile Subscriber Identification Number) detach message to the UE, and is used to instruct the UE to attach and execute the Combined TAU (Combind) from the MSC selected in the joint attach process. Tracking Area Update, Joint Location Update) Process.
  • IMSI International Mobile Subscriber Identification Number
  • the MME has selected the MSC for the UE before the VOIP service is performed. Therefore, the MME can select the MSC according to the existing procedure.
  • the MME detects whether the UE performs VOIP service, and when detecting that the UE performs the VOIP service, sends a message to the UE to indicate that the MSC selected from the joint attach process is detached, so as to cancel the association between the UE and the MSC. Relationship, and instruct the UE to initiate a joint location update procedure to re-join the UE.
  • the method for the MME to detect whether the UE performs the VOIP service may include: determining, by the MME, whether the QCI (Qos Class Identify) of the VOIP bearer is equal to 1 according to the bearer established for the UE, and if the QCI is equal to 1, the MME determines The UE is performing VOIP service. If the QCI is not equal to 1, the Bay U MME determines that the UE does not perform VOIP service.
  • the MME selects a second MSC for the UE that supports both CSFB and SRVCC.
  • the MME re-joines the UE for the UE. Therefore, an MSC that supports both CSFB and SRVCC can be selected, so that the UE can correctly switch to the CS domain in the subsequent process.
  • the MME selects the second MSC in the SRVCC process, so that the UE switches to the CS domain and accesses the second MSC. Perform CS domain location service.
  • the joint location update process in step 601 may specifically include:
  • the UE performs a joint attach procedure, in which the UE attaches to the MME and attaches to one MSC.
  • the UE performs a VOIP service.
  • the UE performs the VOIP service to perform the bearer process.
  • the MME judges according to the QCI (QoS Class Identifier) in the received message. If the value of the QCI is 1, The VOIP service is being carried out on behalf of the UE. If the value of the QCI is 0, the VOIP service is not performed on behalf of the UE.
  • QCI QoS Class Identifier
  • the UE After receiving the IMSI detach message, the UE sends a Combind TAU joint location update message to the MME to initiate a joint location update process.
  • the MME reselects an MSC that supports both CSFB and SRVCC.
  • the MME sends a location update request Location Update Request message to the reselected MSC, requesting location update.
  • the MSC After receiving the location update request message sent by the MME, the MSC performs interaction with the HSS to perform location update of the UE in the CS domain.
  • the MSC sends a location update acknowledgement Location Update Accept message to the MME.
  • the MME After receiving the location update acknowledgement message, the MME sends a joint location update acknowledgement Combind TAU Accept message to the UE, and the joint location update process ends.
  • the SRVCC process triggered by the location service based on the CS domain is similar to the process shown in FIG. 5, except that the MME selects the process in the SRVCC process and the above-mentioned joint attachment process in step 504.
  • the same MSC is selected, and the MME is selected in the SRVCC process to select the same MSC as that selected in the foregoing joint location update process, and the rest are similar, and are not described here.
  • the UE can be correctly switched to the CS domain.
  • the MME selects an MSC that supports both the CSFB and the SRVCC for the UE, and if the location service of the CS domain triggers the SRVCC process of the UE in the process of the VOIP service, the SRVCC process is performed.
  • the UE can ensure that the UE can correctly access the CSFB supporting the CSFB, thereby performing location service in the CS domain, and solving the problem that the UE cannot complete the CS domain when the MME selects an unsupported MSC in the joint attachment in the prior art. Location business issues. Referring to FIG.
  • another embodiment of the present invention further provides an apparatus for switching to a circuit switched domain, including: a first selecting module 801, configured to select, for a user equipment UE, a circuit switched domain back-off CSFB and a single support Channel wireless voice call continuity SRVCC mobile switching center MSC;
  • the second selection module 802 is configured to: when the UE performs the VOIP service, if the location service of the circuit switched CS domain triggers the SRVCC process of the UE, select the first selection module 801 selected by the UE in the SRVCC process.
  • the MSC supports both CSFB and SRVCC, so that the UE switches to the CS domain, accesses the MSC, and performs CS domain location service.
  • the first selection module 801 may be specifically configured to select, for the UE in the joint attach process, a first MSC that supports both the CSFB and the SRVCC.
  • the second selection module 802 may be specifically configured to: when the UE performs the VOIP service, if the location service of the CS domain triggers the SRVCC process of the UE, select the selected by the first selection module 801 in the SRVCC process.
  • the first MSC after the UE switches to the CS domain, accesses the first MSC and performs CS domain location service.
  • the first selection module 801 may be specifically configured to: when the UE performs the VOIP service, send an IMSI detach message to the UE, to indicate that the UE detaches from the MSC selected in the joint attach process and performs the joint location update process.
  • a second MSC supporting both CSFB and SRVCC is selected for the UE.
  • the second selection module 802 may be specifically configured to: when the UE performs the VOIP service, if the location service of the CS domain triggers the SRVCC process of the UE, select the selected by the first selection module 801 in the SRVCC process.
  • the second MSC is configured to enable the UE to switch to the CS domain, access the second MSC, and perform CS domain location service.
  • the foregoing apparatus provided in this embodiment may specifically be an MME.
  • the foregoing apparatus selects an MSC that supports both CSFB and SRVCC for the UE, and if the location service of the CS domain triggers the SRVCC process of the UE in the process of performing VOIP service, the SRVCC process is performed in the SRVCC process.
  • the MSC that supports both the CSFB and the SRVCC is selected to ensure that the UE can correctly access the MSC supporting the CSFB based on the normal operation of the SRVCC process, thereby performing location services in the CS domain, and solving the MME in the prior art.
  • the unsupported MSC is selected in the joint attachment, the UE cannot complete the problem of the CS domain location service.
  • another embodiment of the present invention further provides a system for switching to a circuit switched domain, including a UE 901 and a device 902 for switching to a circuit switched domain;
  • the UE 901 is configured to: when the UE performs the VOIP service, if the location service of the circuit switched CS domain triggers the SRVCC process of the UE, switching to the CS domain to access the device 902 selects the supported CSFB and supports The MSC of the SRVCC performs the CS domain location service.
  • the device 902 has the same function as the device provided in the embodiment 4.
  • the system provided by this embodiment may perform the method provided by any of the foregoing method embodiments.
  • the device selects an MSC that supports both CSFB and SRVCC for the UE, and if the location service of the CS domain triggers the SRVCC process of the UE during the VOIP service of the UE, the SRVCC is used in the SRVCC.
  • the MSC that supports both the CSFB and the SRVCC is selected to ensure that the UE can correctly access the MSC supporting the CSFB, thereby performing location services in the CS domain, and solving the prior art.
  • the MME selects an unsupported MSC in the joint attach, the UE cannot complete the problem of the CS domain location service.
  • each unit included is only divided according to functional logic, but is not limited to the foregoing division, as long as the corresponding function can be implemented;
  • the specific names are also for convenience of distinguishing from each other and are not intended to limit the scope of the present invention.
  • the storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Abstract

本发明实施例提供了一种切换到电路交换域的方法、装置和系统,涉及通信技术领域,所述方法包括:为UE选择一个既支持CSFB又支持SRVCC的MSC;在UE进行VOIP业务的过程中,如果CS域的位置服务触发了所述UE的SRVCC流程,则在SRVCC流程中选择所述既支持CSFB又支持SRVCC的MSC,以使UE切换到CS域后接入所述MSC并进行CS域位置服务。所述装置包括:第一选择模块和第二选择模块。所述系统包括UE和所述装置。本发明实施例实现了进行VOIP业务的UE能够正确切换到CS域并进行位置业务。

Description

切换到电路交换域的方法、 装置和系统 技术领域
本发明涉及通信技术领域, 特别涉及一种切换到电路交换域的方法、 装置和系统。 背景技术
目前, 3GPP (3rd Generation P说artnership Project, 第三代合作伙伴项目) 标准组织推出 了新一代的演进网络架构, 其核心网部分为 SAE ( System Architecture Evolution, 系统架构 演进)网络, 接入网部分为 LTE (Long Term Evolution, 长期演进)网络, 也称为 E-UTRAN ( Evolved Universal Terrestrial Radio Access Network, 演进的通用移动通信系统陆地无线接 入网)。 E-UTRAN由 eNB( evolutional Node B,演进型基书站)组成。 SAE网络由 MME( Mobility Management Entity, 移动性管理实体) 和 SAE 网关两部分组成, SAE 网关包括服务网关 ( Serving Gateway) 和 PDN Gateway ( Packet Data Network, 分组数据网络网关)。 其中, MME为核心网部分的控制平面节点, 承担 UE (User Equipment, 用户设备)上下文以及用 户平面承载的管理功能, 服务网关承担用户业务数据的传输功能, PDN Gateway承担用户 信令数据的传输功能。
当 UE正在 SAE/LTE网络的 PS ( Packet Switch, 分组交换)域上进行 VOIP (Voice over Internet Protocol, 网络电话) 业务时, 如果由于 CS ( Circuit Switch, 电路交换) 域的位置 服务触发了 CS MT-LR ( (Mobile Terminating Location Request, 移动终结定位请求) 流程, 则需要执行 SRVCC ( Single Radio Voice Call Continuity, 单信道无线语音呼叫连续性)流程 将 UE切换回 CS ±或, UE切换到 CS域后由之前联合附着的 MSC通知 UE提供位置信息, 这种场景下, 如果联合附着的 MSC并不具备 SRVCC的能力, 则会导致 UE无法完成 CS 域的位置业务。 发明内容
本发明实施例提供了一种切换到电路交换域的方法、装置和系统, 以实现进行 VOIP业 务的 UE能够正确切换到 CS域。 所述技术方案如下:
一方面, 提供了一种切换到电路交换域的方法, 包括:
为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持单信道无线语音呼叫连续 性 SRVCC的移动交换中心 MSC;
在所述 UE进行网络电话 VOIP业务的过程中, 如果电路交换 CS域的位置服务触发了 所述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE选择所述既支持 CSFB又支 持 SRVCC的 MSC, 以使所述 UE切换到 CS域后接入所述 MSC并进行 CS域位置服务。
另一方面, 提供了一种切换到电路交换域的装置, 包括:
第一选择模块,用于为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持单信 道无线语音呼叫连续性 SRVCC的移动交换中心 MSC;
第二选择模块, 用于在所述 UE进行网络电话 VOIP业务的过程中, 如果电路交换 CS 域的位置服务触发了所述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE选择所 述第一选择模块选取的所述既支持 CSFB又支持 SRVCC的 MSC, 以使所述 UE切换到 CS 域后接入所述 MSC并进行 CS域位置服务。
再一方面,提供了一种切换到电路交换域的系统, 包括 UE和如上所述的切换到电路交 换域的装置;
所述 UE, 用于在进行网络电话 VOIP业务的过程中, 如果电路交换 CS域的位置服务 触发了单信道无线语音呼叫连续性 SRVCC流程, 则切换到 CS域接入所述装置选择的所述 既支持电路交换域回退 CSFB又支持 SRVCC的移动交换中心 MSC并进行 CS域位置服务。
本发明实施例提供的技术方案的有益效果是:
通过为 UE选择一个既支持 CSFB又支持 SRVCC的 MSC, 且在 UE进行 VOIP业务的 过程中如果 CS域的位置服务触发了 UE的 SRVCC流程, 则在 SRVCC流程中选择该既支 持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流程正常进行的基础上, 保证了 UE能够 正确接入该支持 CSFB的 MSC, 从而在 CS域进行位置业务, 解决了现有技术中当 MME 在联合附着中选择不支持的 MSC时, UE无法完成 CS域位置业务的问题。 附图说明
为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所需要使用的 附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对于本 领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得其他的 附图。
图 1是本发明实施例提供的网络架构示意图;
图 2是本发明一个实施例提供的切换到电路交换域的方法流程图;
图 3是本发明另一个实施例提供的切换到电路交换域的方法流程图; 图 4是本发明再一个实施例提供的联合附着流程的示意图;
图 5是本发明又一个实施例提供的位置服务触发的 SRVCC流程的示意图;
图 6是本发明另一个实施例提供的切换到电路交换域的方法流程图;
图 7是本发明再一个实施例提供的联合位置更新流程的示意图;
图 8是本发明又一个实施例提供的切换到电路交换域的装置的一种结构图;
图 9是本发明另一个实施例提供的切换到电路交换域的系统结构图。 具体实施方式
为了使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明作进一步 地详细描述, 显然, 所描述的实施例仅仅是本发明一部份实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有做出创造性劳动前提下所获得的所有 其它实施例, 都属于本发明保护的范围。
参见图 1, 为本发明实施例应用的网络架构示意图。 其中, 图中的上方为 2G/3G网络。 2G网络即 GE AN (GSM EDGE Radio Access Network, GSM EDGE无线接入网), 3G网 络即 UTRAN (UMTS Terrestrial Radio Access Network, UMTS 陆地无线接入网) 网络。 其 中, 包括 MSC等设备, 本发明实施例中, MSC也可以称为 MSC Server服务器, 为了描述 方便, 统一称为 MSC, 下文不再特别声明。 在 2G/3G 网络中, 语音业务一般都是承载在 CS域上,数据业务一般承载在 PS域上。图中的中部和下方为 SAE和 LTE网络,包括 SGSN、 MME、HSS(Home Subscriber Server,归属用户服务器)和 Serving/PDN GW等设备。 SAE/LTE 网络作为一种 PS域承载的分组交换系统,语音业务只能承载在 PS域上传输, 并由 IMS (IP Multimedia Subsystem, IP多媒体子系统) 通过基于 IP承载的网络来对语音业务进行控制。 当 UE位于 PS域时, 由 MME为 UE提供服务; 当 UE位于 CS域时, 由 MSC为 UE提供 服务。 本发明实施例中, UE切换到 CS域是指当前正在 VOIP业务的 UE从 PS域切换到 CS域。
本发明实施例还涉及 CSFB技术, CSFB技术通过 UE执行联合附着(Combind Attaching) 来解决 UE从 LTE的 PS域回退到 2G/3G中的 CS域。 在联合附着过程中, MME为 UE选 择一个 MSC, 以便 UE回退到 CS域时由该 MSC为 UE提供服务。 参见图 2, 本发明一实施例提供了一种切换到电路交换域的方法, 包括:
201: 为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持单信道无线语音呼 叫连续性 SRVCC的移动交换中心 MSC。 202:在 UE进行网络电话 VOIP业务的过程中,如果电路交换 CS域的位置服务触发了 UE的 SRVCC流程, 则在 SRVCC流程中为该 UE选择所述既支持 CSFB又支持 SRVCC的 MSC, 以使 UE切换到 CS域后接入该 MSC并进行 CS域位置服务。
本实施例提供的上述方法的执行主体可以是 MME。
本实施例提供的上述方法, 通过为 UE选择一个既支持 CSFB又支持 SRVCC的 MSC, 且在 UE进行 VOIP业务的过程中如果 CS域的位置服务触发了 UE的 SRVCC流程, 则在 SRVCC流程中选择该既支持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流程正常进行 的基础上, 保证了 UE能够正确接入该支持 CSFB的 MSC, 从而在 CS域进行位置业务, 解 决了现有技术中当 MME在联合附着中选择不支持的 MSC时 UE无法完成 CS域位置业务 的问题。 参见图 3, 本发明另一实施例提供了一种切换到电路交换域的方法, 以 MME在联合附 着过程中选择既支持 CSFB又支持 SRVCC的 MSC为例进行说明, 该方法具体包括:
301: 在 UE的联合附着过程中, MME为 UE选择一个既支持 CSFB又支持 SRVCC的 第一 MSC。
通常, UE会在开机启动时执行联合附着流程。 在该联合附着过程中, 首先执行 UE附 着到 PS域的 MME, 然后 MME会为 UE选择一个 MSC, 并执行 UE附着到该 MSC, 以便 后续 UE切换到 CS域后由该 MSC为 UE提供服务,这个 UE既附着到 MME又附着到 MSC 的过程就是联合附着过程。在本实施例中, MME为 UE选择一个既支持 CSFB又支持 SRVCC 的第一 MSC, 以便后续执行 SRVCC流程时 UE能够正确切换的 CS域。
302: 在 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了该 UE的 SRVCC 流程, 则 MME在 SRVCC流程中选择第一 MSC, 以使 UE切换到 CS域后接入第一 MSC 并进行 CS域位置服务。
所述 VOIP业务为 UE在 PS域内的业务, 所述 CS域的位置服务是指由于 UE在 CS域 的位置业务触发的 CS域移动终结的位置服务 CS MT-LR。 例如, UE作为被叫收到了一个 CS域的呼叫, 则 MSC会对 UE进行 CS域的寻呼, 要求 UE提供自己的位置信息。
其中, CS域的位置服务会触发 SRVCC流程, 通过该 SRVCC流程可以实现 UE从 PS 域切换到 CS域。 在该过程中, MME也会为 UE选择一个 MSC以便 UE切换到 CS域后由 该 MSC为 UE提供服务。在本实施例中, MME在 SRVCC流程中选择与联合附着过程中所 选的相同的 MSC, 由于该 MSC具有既支持 CSFB又支持 SRVCC的能力, 因此, 能够保证 UE正确切换到 CS域。 所述 UE接入第一 MSC就表示 UE已经切换到 CS域, 此时 MSC 可以为 UE提供服务了。
参见图 4, 本实施例中, 步骤 301中的联合附着过程可以具体包括:
401: UE发送联合附着请求 Combind Attach Request消息给 MME, 请求进行联合附着, 其中, 该消息中包括一个用于指示联合附着的指示。
402: MME收到该联合附着请求消息后, 为 UE选择一个既支持 CSFB又支持 SRVCC 的 MSC。
403: MME向所选择的 MSC发送位置更新请求 Location Update Request消息, 请求进 行位置更新。
404: MSC收到 MME发送的位置更新请求消息后, 与 HSS交互执行 UE在 CS域内的 位置更新。
405: MSC发送位置更新确认 Location Update Accept消息给 MME。
406: MME收到该位置更新确认消息后, 发送联合附着确认消息给 UE, 联合附着过程 结束。
通过上述联合附着过程, MME为 UE选择了一个既支持 CSFB又支持 SRVCC的 MSC, 从而避免了所选的 MSC不支持 SRVCC导致后续的 SRVCC流程无法正常进行,而且该 MSC 还支持 CSFB使得 UE的切换到 CS域的过程也能够正常进行。
参见图 5, 本实施例中, 步骤 302中的 CS域的位置服务触发进行 VOIP业务的 UE的 SRVCC流程可以具体包括:
501: UE在 PS域进行 VOIP业务。
502: 由于 CS域的位置业务触发了一个 CS域移动终结的位置服务 CS MT-L , MSC 接收到提供位置信息请求 PROVIDE_SUBSCRIBER_LOCATION消息。
502a: MSC发送寻呼请求 Paging Request消息给 MME, MME发送 CS寻呼通知 Paging Notification消息给 UE,通知 UE这是一个位置服务引起的寻呼,并且发送服务请求 Service Request消息给 MSC。
502b: UE发送扩展的业务请求 Extended Service Request消息给 MME。
502c:如果 MME确定出 UE拒绝当前的 CS MT-L 请求,则发送拒绝 CS Paging Reject 消息给 MSC。
502d: 如果 MME确定出 UE接受当前的 CS MT-L 请求, 则发送消息通知 eNodeB, 其中该消息包含 CSFB指示。
503: eNodeB收到该消息后, 回应应答消息给 MME, 并且根据该 CSFB指示要求 UE 对 2G/3G网络进行测量。 504: eNodeB决定并触发执行 SRVCC流程,执行 UE切换到 2G/3G网络,在该 SRVCC 流程中 MME选择与上述联合附着过程中所选的相同的 MSC,由于该 MSC具有既支持 CSFB 又支持 SRVCC的能力,从而能够保证 UE切换到 CS域后连接的 MSC是 502a步中的 MSC, 这样 CS位置服务能够继续进行。
505: UE切换完成后, MSC发送 LCS (Location Notification Invoke, 位置服务通知) 消息给 UE。
506: UE收到后进行位置业务, 向 MSC提供自己的位置信息, 流程结束。
本实施例提供的上述方法, 通过 MME为 UE选择一个既支持 CSFB又支持 SRVCC的
MSC, 且在 UE进行 VOIP业务的过程中如果 CS域的位置服务触发了该 UE的 SRVCC流 程, 则在 SRVCC流程中选择所述既支持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流 程正常进行的基础上,保证了 UE能够正确接入该支持 CSFB的 MSC, 从而在 CS域进行位 置业务, 解决了现有技术中当 MME在联合附着中选择不支持的 MSC时 UE无法完成 CS 域位置业务的问题。 参见图 6, 本发明再一实施例提供了一种切换到电路交换域的方法, 以 MME在联合位 置更新过程中选择既支持 CSFB又支持 SRVCC的 MSC为例进行说明, 该方法具体包括:
601: 当 UE 进行 VOIP 业务时, MME 发送 IMSI ( International Mobile Subscriberldentification Number, 国际移动用户识别码) detach分离消息给 UE, 用于指示 UE从联合附着过程中选择的 MSC去附着并执行 Combind TAU (Combind Tracking Area Update, 联合位置更新) 流程。
其中, UE在进行 VOIP业务之前, 由于已经进行过联合附着过程, 因此, MME已经 为 UE选择过 MSC, 具体地, MME可以按照现有的流程来选择该 MSC。
本实施例中, MME会对 UE是否进行 VOIP业务进行检测, 当检测到 UE进行 VOIP 业务时,发送消息给 UE指示其从联合附着过程中选择的 MSC去附着,以解除 UE与该 MSC 的关联关系, 并指示 UE发起联合位置更新流程, 重新为 UE进行联合附着。 其中, MME 检测 UE是否进行 VOIP业务的方法可以具体包括: MME根据为该 UE建立的承载, 判断 VOIP承载的 QCI (Qos Class Identify, 服务质量分类) 是否等于 1, 如果 QCI等于 1, 则 MME确定 UE正在进行 VOIP业务, 如果 QCI不等于 1, 贝 U MME确定 UE未进行 VOIP业 务。
602: 在联合位置更新流程中, MME为 UE选择一个既支持 CSFB又支持 SRVCC的第 二 MSC。 其中, 联合位置更新流程中, MME为 UE重新进行联合附着, 因此, 可以选择一个既 支持 CSFB又支持 SRVCC的 MSC, 以便后续过程中 UE能够正确切换到 CS域。
603: 在 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了该 UE的 SRVCC 流程, 则 MME在 SRVCC流程中选择第二 MSC, 以使 UE切换到 CS域后接入第二 MSC 并进行 CS域位置服务。
参见图 7, 本实施例中, 步骤 601中的联合位置更新过程可以具体包括:
701: UE执行联合附着过程, 在该过程中 UE附着到 MME且附着到一个 MSC。
702: UE进行 VOIP业务。
703: 当 MME检测到 UE在进行 VOIP业务后, 发送 IMSI detach去附着消息给 UE, 指示 UE从上述 MSC上去附着并执行联合位置更新流程。
其中, UE进行 VOIP业务会执行建立承载流程, 在该建立承载的流程中 MME会根据 收到的消息中的 QCI ( QoS Class Identifier, 服务质量分类标识) 来判断, 如果 QCI的值为 1, 则代表 UE正在进行 VOIP业务, 如果 QCI的值为 0, 则代表 UE没有进行 VOIP业务。
704: UE在收到 IMSI detach消息后, 发送 Combind TAU联合位置更新消息给 MME, 发起联合位置更新流程。
705: MME重新选择一个既支持 CSFB又支持 SRVCC的 MSC。
706: MME向重新选择的 MSC发送位置更新请求 Location Update Request消息, 请求 进行位置更新。
707: MSC收到 MME发送的位置更新请求消息后, 与 HSS交互执行 UE在 CS域内的 位置更新。
708: MSC发送位置更新确认 Location Update Accept消息给 MME。
709: MME收到该位置更新确认消息后, 发送联合位置更新确认 Combind TAU Accept 消息给 UE, 联合位置更新过程结束。
UE执行联合位置更新过程后, 基于 CS域的位置服务触发的 SRVCC流程与图 5所示 的流程类似, 不同之处在于, 将步骤 504中 MME在该 SRVCC流程中选择与上述联合附着 过程中所选的相同的 MSC,替换为 MME在该 SRVCC流程中选择与上述联合位置更新过程 中所选的相同的 MSC, 其余均类似, 此处不赘述。 通过上述过程能够保证 UE正确切换到 CS域。
本实施例提供的上述方法, 通过 MME为 UE选择一个既支持 CSFB又支持 SRVCC的 MSC, 且在 UE进行 VOIP业务的过程中如果 CS域的位置服务触发了该 UE的 SRVCC流 程, 则在 SRVCC流程中选择该既支持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流程 正常进行的基础上,保证了 UE能够正确接入该支持 CSFB的 MSC, 从而在 CS域进行位置 业务, 解决了现有技术中当 MME在联合附着中选择不支持的 MSC时 UE无法完成 CS域 位置业务的问题。 参见图 8, 本发明又一实施例还提供了一种切换到电路交换域的装置, 包括: 第一选择模块 801, 用于为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持 单信道无线语音呼叫连续性 SRVCC的移动交换中心 MSC;
第二选择模块 802, 用于在该 UE进行 VOIP业务的过程中, 如果电路交换 CS域的位 置服务触发了该 UE的 SRVCC流程, 则在 SRVCC流程中为该 UE选择第一选择模块 801 选取的该既支持 CSFB又支持 SRVCC的 MSC, 以使该 UE切换到 CS域后接入该 MSC并 进行 CS域位置服务。
一方面, 第一选择模块 801可以具体用于在 UE的联合附着过程中, 为 UE选择一个既 支持 CSFB又支持 SRVCC的第一 MSC。
相应地, 第二选择模块 802可以具体用于在 UE进行 VOIP业务的过程中, 如果 CS域 的位置服务触发了该 UE的 SRVCC流程, 则在 SRVCC流程中选择第一选择模块 801选取 的所述第一 MSC, 以使 UE切换到 CS域后接入该第一 MSC并进行 CS域位置服务。
另一方面,第一选择模块 801可以具体用于当 UE进行 VOIP业务时,发送 IMSI detach 分离消息给所述 UE, 用于指示 UE从联合附着过程中选择的 MSC去附着并执行联合位置 更新流程, 在联合位置更新流程中, 为 UE选择一个既支持 CSFB又支持 SRVCC 的第二 MSC。
相应地, 第二选择模块 802可以具体用于在 UE进行 VOIP业务的过程中, 如果 CS域 的位置服务触发了该 UE的 SRVCC流程, 则在 SRVCC流程中选择第一选择模块 801选取 的所述第二 MSC, 以使 UE切换到 CS域后接入该第二 MSC并进行 CS域位置服务。
本实施例提供的上述装置具体可以为 MME。
本实施例提供的上述装置, 通过为 UE选择一个既支持 CSFB又支持 SRVCC的 MSC, 且在 UE进行 VOIP业务的过程中如果 CS域的位置服务触发了该 UE的 SRVCC流程,则在 SRVCC流程中选择该既支持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流程正常进行 的基础上, 保证了 UE能够正确接入该支持 CSFB的 MSC, 从而在 CS域进行位置业务, 解 决了现有技术中当 MME在联合附着中选择不支持的 MSC时 UE无法完成 CS域位置业务 的问题。 参见图 9, 本发明另一实施例还提供了一种切换到电路交换域的系统, 包括 UE 901和 切换到电路交换域的装置 902;
UE 901 , 用于在 UE进行 VOIP业务的过程中, 如果电路交换 CS域的位置服务触发了 该 UE的 SRVCC流程, 则切换到 CS域接入所述装置 902选择的所述既支持 CSFB又支持 SRVCC的 MSC并进行 CS域位置服务。
其中, 所述装置 902与实施例 4中提供的装置功能相同。
本实施例提供的所述系统可以执行上述任一方法实施例提供的方法, 详细过程见方法 实施例中的描述, 此处不赘述。
本实施例提供的上述系统, 通过该装置为 UE选择一个既支持 CSFB又支持 SRVCC的 MSC, 且在 UE进行 VOIP业务的过程中如果 CS域的位置服务触发了该 UE的 SRVCC流 程时, 在 SRVCC流程中选择该既支持 CSFB又支持 SRVCC的 MSC, 在保证 SRVCC流程 正常进行的基础上,保证了 UE能够正确接入该支持 CSFB的 MSC, 从而在 CS域进行位置 业务, 解决了现有技术中当 MME在联合附着中选择不支持的 MSC时 UE无法完成 CS域 位置业务的问题。 值得注意的是, 上述用户设备和基站实施例中, 所包括的各个单元只是按照功能逻辑 进行划分的, 但并不局限于上述的划分, 只要能够实现相应的功能即可; 另外, 各功能单 元的具体名称也只是为了便于相互区分, 并不用于限制本发明的保护范围。
另外, 本领域普通技术人员可以理解实现上述各方法实施例中的全部或部分步骤是可 以通过程序来指令相关的硬件完成, 相应的程序可以存储于一种计算机可读存储介质中, 上述提到的存储介质可以是只读存储器, 磁盘或光盘等。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局限于此, 任 何熟悉本技术领域的技术人员在本发明实施例揭露的技术范围内, 可轻易想到的变化或替 换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应该以权利要求的保护 范围为准。

Claims

权 利 要 求 书
1、 一种切换到电路交换域的方法, 其特征在于, 所述方法包括:
为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持单信道无线语音呼叫连续 性 SRVCC的移动交换中心 MSC;
在所述 UE进行网络电话 VOIP业务的过程中,如果电路交换 CS域的位置服务触发了所 述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE选择所述既支持 CSFB又支持 SRVCC的 MSC, 以使所述 UE切换到 CS域后接入所述 MSC并进行 CS域位置服务。
2、根据权利要求 1所述的方法,其特征在于,为 UE选择一个既支持 CSFB又支持 SRVCC 的 MSC, 包括:
在所述 UE的联合附着过程中为所述 UE选择一个既支持 CSFB又支持 SRVCC的第一 MSC。
3、根据权利要求 2所述的方法, 其特征在于, 所述在所述 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE 选择所述既支持 CSFB又支持 SRVCC的 MSC, 以使所述 UE切换到 CS域后接入所述 MSC 并进行 CS域位置服务, 包括:
在所述 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC 流程, 则在所述 SRVCC流程中为所述 UE选择所述第一 MSC, 以使所述 UE切换到 CS域后 接入所述第一 MSC并进行 CS域位置服务。
4、 根据权利要求 1所述的方法, 其特征在于, 为用户设备 UE选择一个既支持 CSFB又 支持 SRVCC的移动交换中心 MSC, 包括:
当所述 UE进行 VOIP业务时, 发送国际移动用户识别码 IMSI分离消息给所述 UE, 用 于指示所述 UE从联合附着过程中选择的 MSC去附着并执行联合位置更新流程;
在所述联合位置更新流程中, 为所述 UE选择一个既支持 CSFB又支持 SRVCC的第二 MSC。
5、根据权利要求 4所述的方法, 其特征在于, 所述在所述 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE 选择所述既支持 CSFB又支持 SRVCC的 MSC, 以使所述 UE切换到 CS域后接入所述 MSC 并进行 CS域位置服务, 包括:
在所述 UE进行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC 流程,则在所述 SRVCC流程中选择所述第二 MSC, 以使所述 UE切换到 CS域后接入所述第 二 MSC并进行 CS域位置服务。
6、 一种切换到电路交换域的装置, 其特征在于, 所述装置包括:
第一选择模块, 用于为用户设备 UE选择一个既支持电路交换域回退 CSFB又支持单信 道无线语音呼叫连续性 SRVCC的移动交换中心 MSC;
第二选择模块, 用于在所述 UE进行网络电话 VOIP业务的过程中, 如果电路交换 CS域 的位置服务触发了所述 UE的 SRVCC流程, 则在所述 SRVCC流程中为所述 UE选择所述第 一选择模块选取的所述既支持 CSFB又支持 SRVCC的 MSC,以使所述 UE切换到 CS域后接 入所述 MSC并进行 CS域位置服务。
7、 根据权利要求 6所述的装置, 其特征在于, 所述第一选择模块具体用于在所述 UE的 联合附着过程中, 为所述 UE选择一个既支持 CSFB又支持 SRVCC的第一 MSC。
8、 根据权利要求 7所述的装置, 其特征在于, 所述第二选择模块具体用于在所述 UE进 行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC流程, 则在所述 SRVCC流程中选择所述第一选择模块选取的所述第一 MSC, 以使所述 UE切换到 CS域后接 入所述第一 MSC并进行 CS域位置服务。
9、 根据权利要求 6所述的装置, 其特征在于, 所述第一选择模块具体用于当所述 UE进 行 VOIP业务时, 发送国际移动用户识别码 IMSI分离消息给所述 UE, 用于指示所述 UE从 联合附着过程中选择的 MSC去附着并执行联合位置更新流程, 在所述联合位置更新流程中, 为所述 UE选择一个既支持 CSFB又支持 SRVCC的第二 MSC。
10、 根据权利要求 9所述的装置, 其特征在于, 所述第二选择模块具体用于在所述 UE 进行 VOIP业务的过程中, 如果 CS域的位置服务触发了所述 UE的 SRVCC流程, 则在所述 S VCC流程中选择所述第一选择模块选取的所述第二 MSC, 以使所述 UE切换到 CS域后接 入所述第二 MSC并进行 CS域位置服务。
11、 一种切换到电路交换域的系统, 其特征在于, 所述系统包括用户设备 UE和如权利 要求 6至 9中任一项所述的切换到电路交换域的装置;
所述 UE, 用于在进行网络电话 VOIP业务的过程中, 如果电路交换 CS域的位置服务触 发了单信道无线语音呼叫连续性 SRVCC流程,则切换到 CS域接入所述装置选择的所述既支 持电路交换域回退 CSFB又支持 SRVCC的移动交换中心 MSC并进行 CS域位置服务。
PCT/CN2012/078630 2012-07-13 2012-07-13 切换到电路交换域的方法、装置和系统 WO2014008667A1 (zh)

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