WO2012129979A1 - 振铃态域切换的方法、系统及装置 - Google Patents

振铃态域切换的方法、系统及装置 Download PDF

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Publication number
WO2012129979A1
WO2012129979A1 PCT/CN2012/070553 CN2012070553W WO2012129979A1 WO 2012129979 A1 WO2012129979 A1 WO 2012129979A1 CN 2012070553 W CN2012070553 W CN 2012070553W WO 2012129979 A1 WO2012129979 A1 WO 2012129979A1
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called
remote end
scc
response message
domain
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PCT/CN2012/070553
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English (en)
French (fr)
Inventor
高扬
周蓝粢
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中兴通讯股份有限公司
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Publication of WO2012129979A1 publication Critical patent/WO2012129979A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing

Definitions

  • the present invention relates to the field of communications, and in particular to a method, system, and apparatus for ringing state domain switching.
  • IP Multimedia Subsystem IP Multimedia Subsystem
  • IP Multimedia Subsystem IP Multimedia Subsystem
  • 3GPP 3rd Generation Partnership Project
  • SIP Session Initial Protocol
  • Communication is independent of access mode. It can have multiple multimedia service control functions and bearer separation, call and session separation, application and service separation, service and network separation, and mobile network and Internet service integration.
  • SRVCC Single Radio Voice Call Continuity
  • the SRVCC corresponds to the UE (User Equipment) of the Single Radio. It is one of the UEs that can only use the 2G/3G Radio (Radio) or LTE (Long Term Evolution) Radio at the same time.
  • the demand for Radio is proposed by the terminal manufacturer, and its purpose is to reuse the RF and related circuits of the 2G/3G and LTE networks.
  • 3 GPP proposes a standard flow method for SRVCC ringing state switching called mode in PS (Packet Switched) domain response, which essentially provides a method of ringing state domain switching. That is, the MSC (Mobile Switching Center) replaces the requesting operation of the UE to initiate the ringing state domain switching, and the SCC AS (ie, the SRVCC AS, Single Radio Voice Call Continuity Application Server, the single radio voice service continuity application server) receives the request.
  • PS Packet Switched
  • the UPDATE (update) message is used to update the remote end; at this time, the called user answers the call in the PS domain, and the SCC AS intercepts the response message; after the domain switching media negotiation is completed, the SCC AS sends the INFO (notification).
  • the message informs the MSC of the relevant session information and carries the handover mode; the UE switches to the CS domain, and sends CS Connect (ie, the off-hook response message of the UE in the CS domain) to notify the MSC that the user has picked up the phone, and the MSC sends the INFO with the response identifier.
  • the message notifies the SCC AS that the SCC AS determines that the called party has answered the call, and sends a 200 OK message (a SIP message event for notifying the calling party that the called party has picked up the call) to the calling party to complete the handover process.
  • a 200 OK message a SIP message event for notifying the calling party that the called party has picked up the call
  • the present invention provides a method, system, and apparatus for ringing state domain switching to solve the above problems.
  • a method for ringing state domain switching including: in a ringing state domain switching process, after the MSC and the remote end negotiate media resources successfully, the SCC AS actively sends the called party to the remote end.
  • the remote end receives the called off-hook response message, and determines that the domain handover operation is completed.
  • the method further includes: the MSC initiates the domain handover request instead of the local end; the SCC AS receives the domain handover request, and associates the local end with the remote end; and the SCC AS sends the update message to update the far
  • the SCC AS intercepts the called off-hook response message.
  • the method further includes: the SCC AS releasing the previously established call.
  • the above-mentioned called off-hook response message includes: an off-hook response 200 OK message.
  • a system for ringing state domain switching including: an MSC, an SCC AS local end, and a remote end, where
  • the SCC AS includes: an active response module, configured to send the called off-hook response message to the remote end after determining that the media resource negotiation succeeds between the MSC and the remote end; the remote end is configured to receive the called party
  • the off-hook response message determines that the domain switch operation is complete.
  • the MSC is configured to initiate a domain handover request instead of the local end;
  • the SCC AS further includes: an association update module, configured to receive the domain handover request, associate the local end and the remote end, send an update message to update the remote end; and the response interception module is set to When the called off-hook response message is received, the called off-hook response message is intercepted.
  • the SCC AS further includes: a call release module, configured to release the previously established call after the domain switch operation is completed.
  • the above-mentioned called off-hook response message includes: an off-hook response 200 OK message.
  • a device for ringing state domain switching is provided, which is disposed on an SCC AS, and includes: an active response module, configured to actively go far after determining that the media resource negotiation is successful between the MSC and the remote end. The terminal sends a called off-hook response message, so that the remote end determines that the domain switching operation is completed.
  • the device further includes: an association update module, configured to receive a domain handover request initiated by the MSC instead of the user equipment UE, associate the UE with the remote end, and send an update message to update the remote end; and the response interception module is configured to receive the called off-hook response In the message, the called off-hook response message is intercepted; the call release module is set to release the previously established call after the domain handover operation is completed.
  • an association update module configured to receive a domain handover request initiated by the MSC instead of the user equipment UE, associate the UE with the remote end, and send an update message to update the remote end
  • the response interception module is configured to receive the called off-hook response In the message, the called off-hook response message is intercepted; the call release module is set to release the previously established call after the domain handover operation is completed.
  • FIG. 1 is a flowchart of a method for ringing state domain switching according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for ringing state domain switching according to a preferred embodiment of the present invention
  • FIG. 4 is a structural block diagram of a system for ringing state domain switching according to an embodiment of the present invention
  • FIG. 5 is a block diagram of a ringing state field according to a preferred embodiment of the present invention
  • FIG. 6 is a structural block diagram of an apparatus for ringing state domain switching according to an embodiment of the present invention
  • FIG. 7 is a structural block diagram of an apparatus for ringing state domain switching according to a preferred embodiment of the present invention.
  • Step S102 After the media resource negotiation succeeds between the MSC and the remote end in the ringing state domain switching process, the SCC is performed.
  • Step S104 The remote end receives the called off-hook response message, and determines that the domain switching operation is completed.
  • the called off-hook response message that is, a message for notifying that the remote called party has been picked up by the off-hook, or directly called an off-hook response message
  • CS Connect is called to pick up the machine to answer the message.
  • the local end switch is the domain switch after the steady state (the field switch of the call state), so when the called end switches to the CS domain, it does not need to be Send the called off-hook response message.
  • the SCC AS sends the second off-hook response message
  • the condition that the called party has already picked up the response is obtained, and the SCC AS controls the entire process, and after the media resource negotiation succeeds between the MSC and the remote end, the active The called off-hook response message is sent to the remote end to complete the handover process.
  • the method for ringing state domain switching may further include: Step S202: The MSC initiates a domain handover request instead of the local end; Step S204, the SCC AS receives the domain handover request. The SCC AS sends an UPDATE message to update the remote end. Step S208: When the SCC AS receives the called off-hook response message, the SCC AS intercepts the called off-hook response message.
  • the foregoing steps are the initial steps in the entire handover process, that is, when the initial session establishment is in the ringing state, the primary and the called resources are successfully negotiated; at this time, the radio access signal is weakened, and the MSC initiates the domain handover operation request instead of the local end; SCC AS The domain switching request is received, and the local end and the remote end are associated; the SCC AS sends an UPDATE message to update the remote end (media update); at this time, the called user picks up the call in the PS domain; the SCC AS receives the called user in the PS domain. When the message is picked up by the off-hook, the called off-hook response message is intercepted.
  • Step S210 subsequent to step S208 corresponds to the above-described step S102
  • step S212 corresponds to the above-described step S104.
  • the method further includes: Step S214: The SCC AS releases the previously established call.
  • the SCC AS can release the call of the service user in the PS domain before, so as to ensure that resources are not wasted.
  • the above-mentioned called off-hook response message may include: a 200 OK message of an off-hook response.
  • the 200 OK message is used to indicate that the called user has picked up the call and is the easiest and most convenient to implement.
  • Step S302 1 ⁇ _8 carries a caller SDP (Session Description Protocol) to initiate a call to the SRVCC in the PS domain.
  • SDP Session Description Protocol
  • User UE_A, and UE_A has been anchored to the SCC AS;
  • UE A replies with a ringing message (180 message) with the called SDP;
  • the resources at both ends have been negotiated successfully, and the session is in a ringing state;
  • UE_A reports the radio access signal to E.
  • E-UTRAN (Evolved Universal Mobile Telecommunications System Terrestrial Access), E-UTRAN determines to trigger SRVCC handover (handover) to the CS domain according to the radio access signal; MSC carries STR-SR (Session Transfer Number - Single Radio, session switching number) initiates a session switching operation; UE_A - is in a ringing state; Step S304, the MSC initiates an initial INVITE session switching request, and carries a Request-URI (Request-Uniform Resource Identifier, request The universal resource identifier) is the SDP supported by the STR-SR, MGW (Media Gateway); Step S306 The IM CN (IP Multimedia Core Network) forwards the INVITE request of the session switch to the SCC AS.
  • STR-SR Session Transfer Number - Single Radio, session switching number
  • UE_A - is in a ringing state
  • Step S304 the MSC initiates an initial INVITE session switching request, and carries a Request
  • Step S308 the SCC AS associates the local end with the remote end, because the initial resource has been negotiated when the primary and the called party are ringing.
  • the SCC AS prepares an update operation to the remote end; the SCC AS sends an UPDATE message to update the remote end; the segment of the medium SDP indicates that the resource is available;
  • Step S310 the IM CN forwards the UPDATE message to the terminal UE_B;
  • Step S312 the handover process In the middle, the called user 1 ⁇ _ is in?
  • Step S314 UE A sends a 200 OK message of the off-hook response in the PS domain;
  • Step S316 the IM CN forwards the 200 OK message to the SCC AS; when the SCC AS receives the 200 OK message, it judges that the domain handover is being performed, and then intercepts Step S318, UE_B replies with 200 OK (UPDATE), and carries the terminal media capability;
  • Step S320 the IM CN forwards the 200 OK to the SCC AS;
  • Step S322 the SCC AS sends the 183 message with the terminal media capability (the response of the INVITE message) [024]
  • Step S326 the MSC replies to the Prack (temporary response message);
  • Step S328 the IM CN forwards the Prack to the SCC AS;
  • Step S330 the SCC AS replies to the PACK 200 OK;
  • Step S332 the IM CN forwards the 200 OK to the MSC;
  • step S344 the UE receives the handover sent by the E-UTRAN; Step S346, the UE switches to the CS domain; Step S348, the SCC AS determines that the domain switching media negotiation is successful, and the called party has picked up the call, and then sends the extract
  • the machine responds with the 200 OK message;
  • Step S350 the IM CN forwards the response response message to the calling user UE_B; Step S352, the calling user UE_B replies with an ACK (Acknowledge Chara Cter, confirmation character); step S354, IM CN forwards the ACK to the SCC AS; step S356, the SCC AS sends a 200 OK (INVITE) response message to inform the MSC that the handover is successful; step S
  • the ringing domain switching system includes: an MSC, an SCC AS local end (called end), and a remote end (call originating end), where: the foregoing SCC AS includes: an active response
  • the module 42 is connected to the remote end, and is configured to: after determining that the media resource negotiation is successful between the MSC and the remote end, actively sending the called off-hook response message to the remote end; the remote end is configured to receive the called off-hook response message. , to determine that the domain switch operation is complete.
  • the system uses the SCC AS to know the condition that the called party has picked up the call when sending the second off-hook response message.
  • the active response module 42 of the SCC AS is used.
  • the called off-hook response message is sent to the remote end to complete the handover process. Therefore, it is not necessary to send a second off-hook response message, which reduces the steps required for the entire handover process, and is easier to implement.
  • the MSC is configured to initiate a domain switch request instead of the backup end (ie, the called end). As shown in FIG.
  • the SCC AS may further include: an association update module 44, connected to the MSC and the remote end, The method is configured to receive the foregoing domain switching request, associate the local end and the remote end, and send an update message to update the remote end; the response intercepting module 46 is connected to the MSC and the remote end, and is configured to: when receiving the called off-hook response message, The called off-hook response message is intercepted.
  • an association update module 44 connected to the MSC and the remote end, The method is configured to receive the foregoing domain switching request, associate the local end and the remote end, and send an update message to update the remote end
  • the response intercepting module 46 is connected to the MSC and the remote end, and is configured to: when receiving the called off-hook response message, The called off-hook response message is intercepted.
  • the initial process of the handover process when the initial session is established in the ringing state, the primary and the called resources are negotiated successfully; at this time, the radio access signal is weakened, and the MSC initiates the domain handover operation request instead of the local end; the association in the SCC AS
  • the update module 44 receives the domain switch request, associates the local end and the remote end, and sends an UPDATE message to update the remote end; at this time, the called user picks up the call in the PS domain; the response intercepting module 46 receives the called user in the PS domain.
  • the called off-hook response message is intercepted.
  • the foregoing SCC AS may further include:
  • the call release module 48 is connected to the remote end and is configured to release the previously established call after the domain switching operation is completed. After the domain switching operation is completed, the call release module 48 can release the previous call of the service user in the PS domain to ensure that resources are not wasted.
  • the above-mentioned called off-hook response message may include: a 200 OK message of an off-hook response. The 200 OK message is used to indicate that the called user has picked up the call and is the easiest and most convenient to implement.
  • FIG. 6 is a structural block diagram of an apparatus for ringing state domain switching according to an embodiment of the present invention. As shown in FIG.
  • the device for ringing state switching includes: an active response module 62, configured to send the called offhook to the remote end after determining that the media resource negotiation is successful between the MSC and the remote end.
  • the response message causes the remote end to determine that the domain switching operation is complete.
  • the active response module 62 actively sends the called off-hook response message to the remote end after determining that the media resource negotiation is successful between the MSC and the remote end, to complete the handover process. Therefore, it is not necessary to send a second off-hook response message, which reduces the steps required for the entire handover process, and is easier to implement.
  • the apparatus for ringing state domain switching may further include: an association update module 64, configured to receive an MSC to replace the local domain handover request initiated by the local end, and associate the local end with the far end. And sending an update message to update the remote end;
  • the response intercepting module 66 is connected to the associated update module 64 and the active response module 62, and is configured to intercept the called off-hook response message when receiving the called off-hook response message;
  • the release module 68 is coupled to the active response module 62 and configured to release the previously established call after the domain switching operation is completed.
  • the association update module 64 in the SCC AS Receive the domain switch request, associate the local end and the remote end, and send an UPDATE message to update the remote end; at this time, the called user picks up the call in the PS domain; the response intercepting module 66 receives the called user picking up the response in the PS domain.
  • the call release module 68 can release the previous call of the service user in the PS domain to ensure that resources are not wasted.
  • the process of ringing state domain switching is simplified, the whole switching process is more reasonable, and the implementation is faster and more convenient.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.

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Description

振铃态域切换的方法、 系统及装置 技术领域 本发明涉及通信领域， 具体而言， 涉及一种振铃态域切换的方法、 系统及装置。 背景技术 IMS (IP Multimedia Subsystem, 网际协议多媒体子系统） 是未来多媒体通信的发 展方向，也是下一代网络最为重要的组成部分。它是 3GPP ( Third Generation Partnership Project, 第三代合作伙伴计划）提出的支持 IP多媒体业务的子系统， 其显著特征是采 用了 SIP ( Session Initial Protocol, 会话初始协议） 体系， 通信与接入方式无关， 可以 具备多种多媒体业务控制功能与承载能力分离、 呼叫与会话分离、 应用与服务分离、 业务与网络分离， 以及移动网与因特网业务融合等多种能力。
SRVCC ( Single Radio Voice Call Continuity, 单射频语音业务连续性）可以实现无 线用户在 Single Radio (单射频） 的环境下， 在 IMS与 CS (Circuit Switched, 电路交 换）之间的语音切换。 SRVCC对应 Single Radio的 UE (User Equipment, 用户设备）， 是只能在同一时间使用 2G/3G的 Radio (射频）、 LTE (Long Term Evolution, 长期演 进系统） 的 Radio的 UE中的一种， Single Radio的需求是终端厂商提出的， 其目的是 复用 2G/3G、 LTE网络的射频和相关电路。
3 GPP提出了 SRVCC振铃态切换被叫模式在 PS (Packet Switched, 分组交换 ） 域应答时的标准流程方法， 实质上提供了一种振铃态域切换的方法。 即 MSC (Mobile Switching Center,移动交换中心）代替 UE发起振铃态域切换的请求操作， SCC AS (即 SRVCC AS, Single Radio Voice Call Continuity Application Server,单射频语音业务连续 性应用服务器）接收到该域切换操作请求时， 使用 UPDATE (更新）消息去更新远端； 此时被叫用户在 PS域摘机应答， SCC AS将此应答消息拦截；域切换媒体协商完成后， SCC AS发送 INFO (通知）消息通知 MSC相关会话信息， 并携带切换模式； UE切换 至 CS域， 并发送 CS Connect (即 UE在 CS域的摘机应答消息） 通知 MSC用户已经 摘机， MSC则发送带应答标识的 INFO消息通知 SCC AS, SCC AS判断被叫已经摘机 应答， 则发送 200OK消息 （一种 SIP消息事件， 用于通知主叫被叫已经摘机应答）给 主叫， 完成切换过程 。 整个过程步骤较多， 实现较为复杂。 发明内容 本发明提供了一种振铃态域切换的方法、 系统及装置， 以解决上述问题。 根据本发明的一个方面， 提供了一种振铃态域切换的方法， 包括： 在振铃态域切 换过程中， MSC和远端进行媒体资源协商成功后， SCC AS主动向远端发送被叫摘机 应答消息； 远端接收该被叫摘机应答消息， 确定域切换操作完成。 在 SCC AS主动向远端发送被叫摘机应答消息之前， 还包括： MSC代替本端发起 域切换请求； SCC AS接收该域切换请求， 关联本端和远端； SCC AS发送更新消息更 新远端； SCC AS接收到被叫摘机应答消息时， 将该被叫摘机应答消息拦截。 在远端接收该被叫摘机应答消息， 确定域切换操作完成之后， 还包括： SCC AS 释放在先建立的呼叫。 上述被叫摘机应答消息包括： 摘机应答的 200OK消息 根据本发明的另一方面，提供了一种振铃态域切换的系统，包括： MSC、 SCC AS 本端、 远端， 其中， 上述 SCC AS包括： 主动应答模块， 该主动应答模块， 设置为在 确定 MSC和远端进行媒体资源协商成功后， 主动向远端发送被叫摘机应答消息； 上 述远端， 设置为接收该被叫摘机应答消息， 确定域切换操作完成。 上述 MSC， 设置为代替本端发起域切换请求； SCC AS还包括： 关联更新模块， 设置为接收域切换请求， 关联本端和远端， 发送更新消息更新远端； 应答拦截模块， 设置为在接收到被叫摘机应答消息时， 将该被叫摘机应答消息拦截。
SCC AS还包括： 呼叫释放模块， 设置为在域切换操作完成后， 释放在先建立的 呼叫。 上述被叫摘机应答消息包括： 摘机应答 200OK消息。 根据本发明的又一方面， 提供了一种振铃态域切换的装置， 设置于 SCC AS上， 包括： 主动应答模块， 设置为在确定 MSC和远端进行媒体资源协商成功后， 主动向 远端发送被叫摘机应答消息， 使远端确定域切换操作完成。 上述装置还包括： 关联更新模块， 设置为接收 MSC代替用户设备 UE发起的域切 换请求， 关联 UE和远端， 发送更新消息更新远端； 应答拦截模块， 设置为在接收到 被叫摘机应答消息时， 将该被叫摘机应答消息拦截； 呼叫释放模块， 设置为在域切换 操作完成后， 释放在先建立的呼叫。 通过本发明， 采用在 MSC和远端进行媒体资源协商成功后， SCC AS主动向远端 发送被叫摘机应答消息的应答消息， 完成域切换操作的方案， 解决了现有技术中振铃 态域切换步骤较多， 实现较为复杂的问题， 减少了所需步骤， 降低了实现难度。 附图说明 此处所说明的附图用来提供对本发明的进一步理解， 构成本申请的一部分， 本发 明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的不当限定。 在附图 中： 图 1是根据本发明实施例的振铃态域切换的方法的流程图； 图 2是根据本发明优选实施例的振铃态域切换的方法的流程图； 图 3是根据本发明实例的振铃态域切换的方法的流程图示意图； 图 4是根据本发明实施例的振铃态域切换的系统的结构框图； 图 5是根据本发明优选实施例的振铃态域切换的系统的结构框图； 图 6是根据本发明实施例的振铃态域切换的装置的结构框图； 图 7是根据本发明优选实施例的振铃态域切换的装置的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 需要说明的是， 在不冲突的 情况下， 本申请中的实施例及实施例中的特征可以相互组合。 图 1是根据本发明实施例的振铃态域切换的方法的流程图。 如图 1所示， 根据本 发明实施例的振铃态域切换的方法包括： 步骤 S102, 在振铃态域切换过程中， MSC和远端进行媒体资源协商成功后， SCC
AS主动向远端 （即呼叫发起端） 发送被叫摘机应答消息； 步骤 S104, 远端接收该被叫摘机应答消息， 确定域切换操作完成。 在 3GPP提出的振铃态域切换过程中， 发送了两次被叫摘机应答消息 （即用于通 知远端被叫端已经摘机应答的消息， 或直接称为摘机应答消息）， 第一次是本端（即被 叫端） 在 PS域摘机发送的摘机应答消息， 之后还需要本端切换到 CS域再发送一次 CS Connect被叫摘机应答消息。 由于在此之前被叫已经摘机应答， 对于本端来说看到 的则是稳态后的域切换 （通话态的域切换）， 所以此时被叫端切换到 CS域时， 不需要 再次发送被叫摘机应答消息了。 通过上述方法， 利用 SCC AS在发送第二次摘机应答 消息时已经获知了被叫已经摘机应答这一条件， 由 SCC AS控制整个流程，在 MSC和 远端进行媒体资源协商成功后， 主动向远端发送被叫摘机应答消息， 以完成切换过程。 从而消除了发送第二次摘机应答消息的必要性， 减少了整个切换过程所需的步骤， 使 切换实现起来更为容易。 优选地， 如图 2所示， 根据本发明优选实施例的振铃态域切换的方法还可以进一 步包括： 步骤 S202， MSC代替本端发起域切换请求； 步骤 S204， SCC AS接收该域切换请求， 关联本端和远端； 步骤 S206， SCC AS发送 UPDATE消息更新远端； 步骤 S208， SCC AS接收到被叫摘机应答消息时， 将该被叫摘机应答消息拦截。 上述步骤是整个切换过程中的初始步骤， 即初始会话建立处于振铃态时， 主被叫 资源协商成功； 此时， 无线接入信号渐弱， MSC代替本端发起域切换操作请求； SCC AS收到域切换请求， 关联本端和远端； SCC AS发送 UPDATE消息去更新远端 (媒体 更新)； 此时， 被叫用户在 PS域摘机应答； SCC AS接收到被叫用户在 PS域摘机应答 的消息时， 则将此被叫摘机应答消息拦截。 步骤 S208之后的步骤 S210相当于上述的 步骤 S102, 步骤 S212相当于上述的步骤 S104。 优选地， 如图 2所示， 在步骤 S112之后还可以进一步包括： 步骤 S214， SCC AS释放在先建立的呼叫。 与上述步骤相对应， 在域切换操作完成后， SCC AS就可以释放业务用户之前在 PS域的那路呼叫了， 以确保资源不被浪费。 优选地， 上述被叫摘机应答消息可以包括： 摘机应答的 200OK消息。 采用 200OK消息表示被叫用户已经摘机应答， 实现起来最为简单、 方便。 下面结合实例及附图 3对上述优选实施例进行详细说明。 图 3是根据本发明实例的振铃态域切换的方法的流程图示意图。 如图 3所示， 根 据本发明实例的振铃态域切换的方法包括以下步骤： 步骤 S302, 1^_8携带主叫 SDP ( Session description protocol, 会话描述协议）发 起呼叫到在 PS域中的 SRVCC用户 UE_A， 且 UE_A已经锚定到 SCC AS; UE A回 复带被叫 SDP的振铃消息（ 180消息）；两端资源已经协商成功，此会话处于振铃状态； UE_A上报无线接入信号给 E-UTRAN (Evolved Universal Mobile Telecommunications System Terrestrial Access, 演进的通用移动通信系统陆地无线接入网）， E-UTRAN根据 无线接入信号决定触发 SRVCC handover (切换）至 CS域； MSC携带 STR-SR ( Session Transfer Number - Single Radio, 会话切换号码） 发起会话切换操作； UE_A—直处于 振铃状态； 步骤 S304， MSC发起初始 INVITE (邀请） 会话切换请求， 且携带 Request-URI (Request-Uniform Resource Identifier, 要求的通用资源标志符） 为 STR-SR, MGW (Media Gateway, 媒体网关） 支持的 SDP; 步骤 S306， IM CN (IP Multimedia Core Network ， IP多媒体核心网）转发会话切 换的 INVITE请求至 SCC AS； 步骤 S308， SCC AS将本端与远端进行关联， 因之前主被叫振铃状态时初始资源 已经协商好， 故 SCC AS准备对远端的更新操作； SCC AS发送 UPDATE消息去更新 远端； 此段媒体 SDP表示资源可用； 步骤 S310， IM CN转发此条 UPDATE消息给终端 UE_B; 步骤 S312， 切换过程中， 被叫用户 1^_ 在？8域摘机应答； 步骤 S314， UE A在 PS域发送摘机应答的 200OK消息； 步骤 S316， IM CN转发 200OK消息至 SCC AS; SCC AS接收到 200OK消息时， 判断正在进行域切换， 则拦截此条 200OK消息； 步骤 S318， UE_B回复 200OK (UPDATE), 并携带终端媒体能力； 步骤 S320， IM CN转发 200OK给 SCC AS; 步骤 S322， SCC AS发送带终端媒体能力的 183消息（INVITE消息的响应消息）; 步骤 S324， IM CN转发 183消息给 MSC; 步骤 S326， MSC回复 Prack (临时响应消息）； 步骤 S328， IM CN转发 Prack至 SCC AS; 步骤 S330, SCC AS回复 Prack的 200OK; 步骤 S332， IM CN转发 200OK至 MSC; 步骤 S334， SCC AS发送 INFO消息请求， 包括会话相关信息， 携带 SCC被叫切 换标识， 且状态已经准备妥当； 步骤 S336， IM CN转发此 INK)消息给 MSC; MSC接收到 INK)消息， 根据消 息内容那个判断出为被叫振铃态域切换； 步骤 S338， MSC回复 INFO的响应消息 200OK; 步骤 S340， IM CN转发 200OK (INFO) 消息； 步骤 S342， MSC接收到携带会话相关信息的 INK)消息时， 进入呼叫传递状态 (Call delivered state) ； 步骤 S344， UE接收到 E-UTRAN发送的 handover; 步骤 S346， UE切换至 CS域； 步骤 S348， SCC AS判断域切换媒体协商成功， 且被叫已经摘机应答， 则发送摘 机应答的 200OK消息； 步骤 S350， IM CN转发此应答响应消息给主叫用户 UE_B; 步骤 S352， 主叫用户 UE_B回复 ACK (Acknowledge Character, 确认字符） ； 步骤 S354， IM CN转发 ACK至 SCC AS; 步骤 S356， SCC AS发送 200OK (INVITE) 响应消息， 以告知 MSC切换成功； 步骤 S358， IM CN转发 200OK (INVITE) 消息至 MSC; 步骤 S360， MSC回复 ACK消息； 步骤 S362， IM CN转发 ACK至 SCC AS; 步骤 S364， SCC AS回复被叫用户在 PS域摘机的应答消息 ACK; 步骤 S366， IM CN转发此 ACK至 UE (PS域）； 步骤 S368， SCC AS释放原来被叫用户在 PS域的那路呼叫。 图 4是根据本发明实施例的振铃态域切换的系统的结构框图。 如图 4所示， 根据 本发明实施例的振铃态域切换的系统包括： MSC、 SCC AS 本端（被叫端）、远端（呼 叫发起端）， 其中： 上述 SCC AS包括： 主动应答模块 42， 连接至上述远端， 设置为在确定 MSC和 远端进行媒体资源协商成功后， 主动向远端发送被叫摘机应答消息； 上述远端， 设置为接收上述被叫摘机应答消息， 确定域切换操作完成。 上述系统， 利用了 SCC AS在发送第二次摘机应答消息时已经获知了被叫已经摘 机应答这一条件，在 MSC和远端进行媒体资源协商成功后， 由 SCC AS的主动应答模 块 42主动向远端发送被叫摘机应答消息， 以完成切换过程。从而不需要再发送第二次 摘机应答消息， 减少了整个切换过程所需的步骤， 实现起来更为容易。 优选地， 上述 MSC， 设置为代替备本端 （即被叫端） 发起域切换请求； 如图 5所示， 上述 SCC AS还可以进一步包括： 关联更新模块 44， 连接至上述 MSC及远端， 设置为接收上述域切换请求， 关联 本端和远端， 发送更新消息更新远端； 应答拦截模块 46， 连接至上述 MSC及远端， 设置为在接收到被叫摘机应答消息 时， 将该被叫摘机应答消息拦截。 在切换过程中的初始过程中，初始会话建立处于振铃态时， 主被叫资源协商成功； 此时， 无线接入信号渐弱， MSC代替本端发起域切换操作请求； SCC AS中的关联更 新模块 44收到域切换请求， 关联本端和远端， 并发送 UPDATE消息去更新远端； 此 时， 被叫用户在 PS域摘机应答； 应答拦截模块 46接收到被叫用户在 PS域摘机应答 的消息时， 则将此被叫摘机应答消息拦截。 优选地， 如图 5所示， 上述 SCC AS还可以进一步包括: 呼叫释放模块 48， 连接至上述远端， 设置为在域切换操作完成后， 释放在先建立 的呼叫。 在域切换操作完成后， 呼叫释放模块 48就可以释放业务用户之前在 PS域的那路 呼叫了， 以确保资源不被浪费。 优选地， 上述被叫摘机应答消息可以包括： 摘机应答的 200OK消息。 采用 200OK消息表示被叫用户已经摘机应答， 实现起来最为简单、 方便。 图 6是根据本发明实施例的振铃态域切换的装置的结构框图。 如图 6所示， 根据 本发明实施例的振铃态域切换的装置包括： 主动应答模块 62， 设置为在确定 MSC和远端进行媒体资源协商成功后， 主动向 远端发送被叫摘机应答消息， 使远端确定域切换操作完成。 通过上述装置， 主动应答模块 62在确定 MSC和远端进行媒体资源协商成功后会 主动向远端发送被叫摘机应答消息， 以完成切换过程。 从而不需要再发送第二次摘机 应答消息， 减少了整个切换过程所需的步骤， 实现起来更为容易。 优选地， 如图 7所示， 根据本发明实施例的振铃态域切换的装置还可以进一步包 括： 关联更新模块 64， 设置为接收 MSC代替本端发起的域切换请求， 关联本端和远 端， 发送更新消息更新远端； 应答拦截模块 66， 与关联更新模块 64及主动应答模块 62相连， 设置为在接收到 被叫摘机应答消息时， 将该被叫摘机应答消息拦截； 呼叫释放模块 68， 与主动应答模块 62相连， 设置为在域切换操作完成后， 释放 在先建立的呼叫。 在整个切换过程中， 初始会话建立处于振铃态时， 主被叫资源协商成功； 此时， 无线接入信号渐弱， MSC代替本端发起域切换操作请求； SCC AS中的关联更新模块 64收到域切换请求， 关联本端和远端， 并发送 UPDATE消息去更新远端； 此时， 被叫 用户在 PS域摘机应答； 应答拦截模块 66接收到被叫用户在 PS域摘机应答的消息时， 则将此被叫摘机应答消息拦截。在域切换操作完成后， 呼叫释放模块 68就可以释放业 务用户之前在 PS域的那路呼叫了， 以确保资源不被浪费。 从以上的描述中， 可以看出， 通过本发明提供的技术方案， 精简了振铃态域切换 的过程， 使整个切换过程更为合理， 实现更为快速、 方便。 显然， 本领域的技术人员应该明白， 上述的本发明的各模块或各步骤可以用通用 的计算装置来实现， 它们可以集中在单个的计算装置上， 或者分布在多个计算装置所 组成的网络上， 可选地， 它们可以用计算装置可执行的程序代码来实现， 从而， 可以 将它们存储在存储装置中由计算装置来执行， 并且在某些情况下， 可以以不同于此处 的顺序执行所示出或描述的步骤， 或者将它们分别制作成各个集成电路模块， 或者将 它们中的多个模块或步骤制作成单个集成电路模块来实现。 这样， 本发明不限制于任 何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本领域的技 术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和原则之内， 所作的 任何修改、 等同替换、 改进等， 均应包含在本发明的保护范围之内。

Claims

权 利 要 求 书
1. 一种振铃态域切换的方法， 包括：
在振铃态域切换过程中， 移动交换中心 MSC和远端进行媒体资源协商成 功后， 单射频语音业务连续性应用服务器 SCC AS主动向远端发送被叫摘机应 答消息；
所述远端接收所述被叫摘机应答消息， 确定域切换操作完成。
2. 根据权利要求 1所述的方法， 其中， 在所述 SCC AS主动向远端发送被叫摘机 应答消息之前， 还包括：
所述 MSC代替本端发起域切换请求；
所述 SCC AS接收所述域切换请求， 关联所述本端和所述远端； 所述 SCC AS发送更新消息更新所述远端；
所述 SCC AS接收到被叫摘机应答消息时， 将该被叫摘机应答消息拦截。
3. 根据权利要求 1所述的方法， 其中， 在所述远端接收所述被叫摘机应答消息， 确定域切换操作完成之后， 还包括：
所述 SCC AS释放在先建立的呼叫。
4. 根据权利要求 1至 3任一项所述的方法， 其中， 所述被叫摘机应答消息包括： 摘机应答的 200OK消息。
5. 一种振铃态域切换的系统， 包括： 移动交换中心 MSC、 单射频语音业务连续性 应用服务器 SCC AS、 本端、 远端，
所述 SCC AS包括： 主动应答模块， 其中， 所述主动应答模块， 设置为在 确定所述 MSC和所述远端进行媒体资源协商成功后， 主动向所述远端发送被 叫摘机应答消息；
所述远端， 设置为接收所述被叫摘机应答消息， 确定域切换操作完成。
6. 根据权利要求 5所述的系统， 其中，
所述 MSC， 设置为代替所述本端发起域切换请求;
所述 SCC AS还包括： 关联更新模块， 设置为接收所述域切换请求， 关联所述本端和所述远端， 发送更新消息更新所述远端；
应答拦截模块， 设置为在接收到被叫摘机应答消息时， 将该被叫摘机应答 消息拦截。
7. 根据权利要求 5所述的系统， 其中， 所述 SCC AS还包括： 呼叫释放模块， 设置为在域切换操作完成后， 释放在先建立的呼叫。
8. 根据权利要求 5至 7任一项所述的系统， 其中， 所述被叫摘机应答消息包括： 摘机应答 200OK消息。
9. 一种振铃态域切换的装置， 设置于单射频语音业务连续性应用服务器 SCC AS 上， 包括：
主动应答模块， 设置为在确定所述 MSC和所述远端进行媒体资源协商成 功后， 主动向所述远端发送被叫摘机应答消息， 使所述远端确定域切换操作完 成。
10. 根据权利要求 9所述的装置， 其中， 还包括：
关联更新模块，设置为接收移动交换中心 MSC代替用户设备 UE发起的域 切换请求， 关联所述 UE和远端， 发送更新消息更新所述远端； 应答拦截模块， 设置为在接收到被叫摘机应答消息时， 将该被叫摘机应答 消息拦截；
呼叫释放模块， 设置为在域切换操作完成后， 释放在先建立的呼叫。
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