CN1297124C - System and method for carrying service using circuit switching in IP multimedia subsystem - Google Patents

System and method for carrying service using circuit switching in IP multimedia subsystem Download PDF

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CN1297124C
CN1297124C CN 200410084824 CN200410084824A CN1297124C CN 1297124 C CN1297124 C CN 1297124C CN 200410084824 CN200410084824 CN 200410084824 CN 200410084824 A CN200410084824 A CN 200410084824A CN 1297124 C CN1297124 C CN 1297124C
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cs
ims
bearer
domain
terminal
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CN1756242A (en
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顾炯炯
朱东铭
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华为技术有限公司
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Abstract

本发明涉及一种在IMS中利用CS承载业务的系统及方法。 The present invention relates to a system and method for using a CS bearer in the IMS service. 本发明主要是将支持在IMS业务中利用CS承载的终端划分为IMS终端模块和CS终端模块两部分并定义了其间的接口交互,以及CS终端模块在IMS终端模块的控制下与CS域呼叫控制实体及CS域和IMS域互通网关交互完成CS承载的建立,进而通过IMS终端模块对其与互通网关及对端用户间的两段IMS会话的关联控制将上述CS承载用于IMS业务的具体过程,这样便可以利用所建立的CS承载传输IMS业务中实时性要求较高的媒体流。 Mainly the present invention is to support the use of terminal CS bearer in the IMS service are divided into two parts IMS terminal module and the CS terminal module has an interface defining the interaction therebetween, and the CS terminal module under control of IMS terminal module and the CS domain call control entity and the CS domain and IMS domain interworking gateway complete the establishment of the CS bearer interaction, and further through the IMS interworking gateway and the terminal module and its associated IMS session between two sections of an end user for controlling the above-described IMS CS bearer service specific process , so that we can use the established CS bearer in the IMS service transmission demanding real-time media stream. 因此,本发明提供了一种在IMS中利用CS承载业务的可行的技术方案。 Accordingly, the present invention provides a feasible technical solution using the CS bearer in the IMS service. 同时还提供了防止CS域路由迂回、计费关联非标终端接入以及异常处理等问题的解决方案。 While also providing a circuitous route to prevent the CS domain, the accounting solutions associated non-standard terminal access and exception handling problems.

Description

IP多媒体子系统中利用电路交换承载业务的系统及方法 System and method for an IP Multimedia Subsystem services using a circuit switched bearer

技术领域 FIELD

本发明涉及网络通信技术领域,尤其涉及一种IP多媒体子系统中利用电路交换承载业务的系统及方法。 The present invention relates to network communication technology, and particularly relates to a system and method for an IP Multimedia Subsystem services using a circuit switched bearer.

背景技术 Background technique

随着移动通讯技术的发展,人们不再满足于单一的语音通信方式,而需要全新的多媒体通信方式,这种多媒体通信不仅仅是简单的视音频通信,还包括即时消息、同址浏览、协同工作、流媒体等业务通信,特别是新通信方式和传统语音融合的业务。 With the development of mobile communication technology, people are no longer satisfied with a single voice communication, and the need for new multimedia communication, multimedia communication this is not just a simple video and audio communications, also includes instant messaging, browsing the same site, coordination work, streaming media and other business communications, especially the new communication and integration of traditional voice services. 基于Internet和电信网络融合的趋势,各标准化组织提出了下一代网络的概念,在分组承载网基础上引入了全IP业务网络架构的IMS(IP多媒体子系统),IMS的目标是按照个性化用户数据,屏蔽用户接入方式,控制业务能力的开放程度,提供多媒体的通信体验。 Based on trends in Internet and telecom network integration, standards organizations proposed the concept of next-generation networks, the introduction of all-IP service network architecture of IMS (IP Multimedia Subsystem) based on the packet bearer network, IMS goal is personalized according to the user data Block user access mode, control the degree of openness of service capability, to provide multimedia communication experience.

IMS中主要的功能实体包括CSCF(呼叫控制功能)实体和HSS(归属用户服务器)实体以及用于实现与电路交换网互通的MGCF/IM-MGW(媒体网关控制功能/IMS媒体网关功能)实体。 The main functional entities in IMS include CSCF (Call Control Function) entity and the HSS (Home Subscriber Server) and a entity MGCF / IM-MGW to achieve interworking with circuit switched network (Media Gateway Control Function / IMS Media Gateway Function) entity. 所述CSCF有三种类型:S-CSCF、P-CSCF、I-CSCF,其中,P-CSCF是IMS终端在IMS网络的第一个接触点,完成代理功能,与终端进行IMS信令交互,进行内部处理然后将其转发给I-CSCF或S-CSCF;I-CSCF是不同运营商间IMS网络的统一入口点,提供本域用户服务节点(S-CSCF)分配、被叫路由查询以及IMS域间拓扑隐藏功能;S-CSCF是IMS最核心的业务控制实体,保存用户签约信息,记录用户呼叫状态,完成呼叫控制功能。 The CSCF There are three types: S-CSCF, P-CSCF, I-CSCF, wherein, P-CSCF is an IMS terminal in the first point of contact of the IMS network to complete the proxy function, a signaling interaction with the IMS terminal, for internal processing and forwards it to the I-CSCF or S-CSCF; I-CSCF is the entry point of unity between different operators IMS network domain, providing the user serving node (S-CSCF) assigned, the called IMS domain route inquiry and Room topology hiding function; S-CSCF is the IMS service control entity of the core, to save the user subscription information, the recording status of the user call, the call control function is completed. 不同S-CSCF可连接不同AS(应用服务器),完成不同业务功能。 S-CSCF can be connected to various different AS (Application Server), to perform different business functions. 归属用户服务器HSS是IMS集中用户数据库,保存用户签约信息和用户状态信息,用于支持各网络实体对呼叫和会话的处理,具体包括用户标识(私有标识和公有标识)、用户业务信息、用户安全相关信息、路由信息、位置信息等。 (HSS) is an IMS centralized user database to save the user subscription information and user status information for each network entities to support the call and the session handling, including user identifier (private identity and public identity), user service information, user security related information, routing information, location information. IMS采用SIP协议作为应用层交互信令,终端和CSCF之间、CSCF之间、CSCF与AS之间接口协议均为SIP协议。 IMS uses SIP as an application layer signaling interaction protocol between terminals and CSCF, between the CSCF, and the AS interface protocol between the CSCF are SIP protocol.

IMS是通过MGCF/IM-MGW完成与电路交换网PSTN(传统电话网)或PLMN CS(公众陆地移动网电路交换)的互通,其中,MGCF实现IMS核心控制面与的交互,支持ISUP/BICC(ISDN用户部分/承载无关的呼叫控制协议)与SIP(初始会话协议)间的协议交互及呼叫互通,通过H.248控制IM-MGW完成与电路交换网TDM(Time Division Multiplex,时分复用)承载与IMS域用户面宽窄带承载互通及必要的Codec编解码变换。 IMS by MGCF / IM-MGW to complete the circuit switched network PSTN (the traditional telephone network) or PLMN CS (Public Land Mobile Network circuit-switched) interworking, wherein, the MGCF interact IMS core control plane and support ISUP / BICC ( protocol interaction and call interworking between the ISDN user part / bearer independent call control protocol) and SIP (session initiation protocol), H.248 by controlling the IM-MGW to complete the circuit switched network TDM (Time Division multiplex, time division multiplexing) carrying wide and the IMS domain user and narrowband bearer interworking necessary codec codec conversion.

传统通讯网络分为CS(电路交换)域和PS(分组交换)域,分别完成电路交换业务(包括语音业务、电路型数据业务、传真等)和分组数据业务。 Traditional communication network is divided into CS (Circuit Switched) domain and PS (Packet Switched) domain, respectively, to complete a circuit switched service (including voice service, circuit-type data service, fax, etc.) and packet data services. IMS业务由控制部分和媒体内容部分组成,控制部分即IMS终端和IMS域实体之间的IMS信令交互,对IMS业务进行控制,媒体内容部分即图像、语音、数据、声音等各种内容媒体流。 IMS service by the control section and a part of the media content, i.e., the control section IMS signaling exchange between IMS terminals and the IMS domain entity, an IMS service control, i.e. the media content portion image, voice, data, audio and other media content flow. IMS信令和媒体流都通过PS域承载,媒体流不需要经过IMS域。 IMS signaling and media streams are carried over the PS domain, the media stream does not need to go through the IMS domain.

由于CS和PS对于网络资源的处理不同,CS是独占资源型,PS则是共享资源型,所以对于实时性要求高的业务,如语音业务,如果用PS承载传输则相比采用CS承载传输的业务质量将有所下降,也就可能无法满足运营商和用户的业务需求。 Since different CS and PS for processing network resources, resource type is an exclusive CS, PS it is a shared resource type, so for a high real-time requirement, such as voice service, if the PS bearer is compared with the transmission using the CS bearer transmissions service quality will decline, it may not be able to meet the operators and users of business needs.

为此,国际标准化组织3GPP提出了综合业务的概念,将多媒体业务通过PS承载和CS承载相结合的方式进行,将实时性要求高的语音业务,仍通过CS承载,其它实时性要求不高的业务,如图片、消息业务等,则通过PS承载,IMS完成统一控制。 To this end, the International Organization for Standardization 3GPP proposed the concept of integrated services, multimedia services will be carried out by PS and CS bearer Bearer combination of high real-time requirements of voice services, still by CS bearer, other less demanding real-time services, such as images, news services, etc., through the PS bearer, the IMS centralized control is completed. 如图1所示,就用户业务体验而言,在用户操作上综合业务和IMS提供的多媒体业务是基本一致的,但在传递时延等方面则因为综合业务中实时性要求较高的媒体流部分采用了CS承载而有了较大的提高。 As shown, the service experience to the user, in the user operation and the integrated services provided by the IMS multimedia service 1 is basically the same, but in terms of transfer delay, etc. as Integrated Services in the demanding real-time media stream using the CS bearer portion and have been greatly improved.

3GPP TS 23.899是3GPP中关于在IMS业务中利用CS承载的技术标准,该标准中给出了实现方案必需满足的一系列要求以及一种备选方案的逻辑功能框架;如图2所示,在3GPP TS 23.899所提出的备选方案的逻辑功能框架中包括CBCF(电路承载控制功能)和CBOF(电路承载始发功能)、CBTF(电路承载终结功能)三个逻辑功能实体,由CBCF在IMS业务中判断并控制CBOF和CBTF间CS承载的建立。 3GPP TS 23.899 is the technical standard in 3GPP on the use of CS bearer in the IMS service, the standard logic functions are given in the frame must satisfy a number of requirements and implementation an alternative; and 2, in frame logic function options proposed 3GPP TS 23.899 includes CBCF (circuit bearer control function) and CBOF (origination function circuit bearing), CBTF (termination circuit bearing function) three logic function entities in the IMS service CBCF in determining and controlling the establishment of the CS bearer between CBOF and the CBTF. 三个功能实体可在原有IMS实体中实现,如UE(用户设备)、AS(应用服务器),具体分布则在会话建立过程中协商。 Three functional entities may be implemented in existing IMS entities, such as UE (user equipment), the AS (application server), the distribution of the specific process of establishing a session negotiation.

在3GPP TS 23.899所提出的备选方案中提出终端到终端以及终端到网关两种不同模式,在终端到网关模式下,CS承载建立方向可以是终端到网络或是相反,与会话方向无关。 Presented to the terminal and the terminal to the terminal in two different modes gateway, to the gateway terminal in the mode, the CS bearer establishment direction in the alternative proposed 3GPP TS 23.899 may be a terminal or vice versa, regardless of the direction of the session to the network.

3GPP TS 23.899中同时列举了方案应该遵循的原则以及需要解决的问题,如要求方案的实现应仅限于影响IMS及支持CSB for IMS的终端,其他网元、终端以及IMS与他网的互通信令都应该不受影响,应提供CS/PS/IMS的计费关联,并确保对终端用户的计费一致性,等等。 3GPP TS 23.899 cited both programs should follow the principles and problems to be solved, such as the implementation of the requirements should be limited to the influence and support of IMS terminal CSB for IMS, and other network elements signaling interworking, and terminal IMS and his network should not be affected, should provide the associated CS / PS / IMS billing, charging and to ensure the consistency of the end user, and so on.

然而,目前对于在IMS业务中利用CS承载,3GPP TS 23.899并未提供具体的实现方案。 However, for the CS bearer in the IMS service, 3GPP TS 23.899 does not provide specific implementation schemes.

发明内容 SUMMARY

鉴于上述现有技术所存在的问题,本发明的目的是提供一种IP多媒体子系统中利用电路交换承载业务的系统及方法,从而实现了在IMS中可以将实时业务通过CS承载传输。 In view of the above-described problems of the prior art, an object of the present invention is a system and method for using a circuit switched bearer service provides an IP Multimedia Subsystem, IMS, in order to achieve real-time traffic may be transmitted through the carrier CS.

本发明的目的是通过以下技术方案实现的:本发明提供了一种IP多媒体子系统中利用电路交换承载业务的系统,包括:IP多媒体子系统IMS终端模块:用于实现电路交换承载控制功能,在IP多媒体子系统业务中判断并控制CS终端模块发起CS承载的建立过程,并在后续收到CS域与IMS域互通网关转发的回呼后完成与CS域与IMS域互通网关及与对端用户间两段IP多媒体子系统会话间的关联控制;电路交换CS终端模块:作为电路交换承载建立的发起端,用于根据IMS终端模块的指令发起CS承载的建立请求,并与CS域呼叫控制实体进行相应的交互完成CS承载的建立过程;CS域呼叫控制实体:与CS终端模块交互建立CS承载,并将由IMS终端模块控制CS终端模块发起建立的CS承载建立的呼叫路由到CS域与IMS域互通网关上;CS域与IMS域互通网关:作为电路交换承载建立的终结端,完成CS域 Object of the present invention is achieved by the following technical solution: The present invention provides a system for using an IP Multimedia Subsystem circuit switched bearer service, comprising: an IP Multimedia Subsystem, IMS, terminal module: for implementing a circuit switched bearer control function, determining and controlling the CS terminal module initiates the CS bearer establish procedure, and after completion of the subsequent receipt of the CS domain and the IMS domain interworking gateway forwards the call back to the CS domain and the IMS domain and the interworking gateway and the peer services in an IP multimedia subsystem between two users associated control between IP multimedia subsystem session; the CS terminal modules: a circuit switched bearer establishment initiator configured to initiate the CS bearer establishment request according to an instruction IMS terminal module and the CS domain call control entity corresponding interaction is complete the process of establishing the CS bearer; CS domain call control entity: with the CS terminal module interaction establishing a CS bearer, and controlled by the IMS terminal module CS terminal module initiates the CS domain and the IMS to establish a CS bearer route the call establishment to the domain interworking gateway; CS domain and the IMS domain interworking gateway: a termination end of a circuit switched bearer establishment complete the CS domain 呼叫控制实体控制路由到本端的CS承载建立的呼叫到IP多媒体子系统会话的互通,并将会话控制信令经接续到控制发起该过程的IMS终端模块。 To route the call control entity controls the CS bearer local call to the shared IP multimedia subsystem session establishment, and session control signaling via a control connection to the module terminal initiates an IMS procedure.

所述的IMS终端模块和CS终端模块集成于同一终端中,或各自独立设置。 IMS terminal according to module and the CS terminal module is integrated in the same terminal, or provided independently.

当所述的IMS终端模块和CS终端模块各自分离设置时,采用短距离无线通信的方式连接互通,且所述的IMS终端采用的方式包括:主机PC或个人数字助理PDA。 IMS terminal when said terminal module and the modules are separated from each CS is provided using short-range wireless communication exchange is connected, and the manner of using the IMS terminal comprises: a host PC or a personal digital assistant PDA.

所述的IMS终端模块和CS终端模块还对应设置有号码存储模块,用于存储分别为IMS终端模块和CS终端模块分配的电话号码;并且,当IMS终端模块和CS终端模块集成于同一终端中时,各自对应的号码存储模块设置为用于被对方直接访问。 The IMS and the CS terminal module corresponding to the terminal module is also provided with a number storage module for storing telephone numbers respectively assigned to an IMS terminal module and the CS terminal module; and, when the CS terminal and the IMS terminal module integrated in the same terminal block , the number corresponding to each memory module is provided for direct access to each other.

本发明还提供了一种基于所述系统的IP多媒体子系统中利用电路交换承载业务的方法,包括:A、在IMS业务中采用CS承载的用户终端的IMS终端模块向CS终端模块发起CS承载建立请求;B、CS终端模块收到IMS终端模块的请求后,与CS域呼叫控制实体交互建立CS承载;C、CS域呼叫控制实体将建立CS承载的呼叫路由到CS域与IMS域互通网关处;D、CS域与IMS域互通网关将建立CS承载的CS域呼叫转化为IMS域会话并接续到控制发起CS承载建立的IMS终端模块。 The present invention further provides a method of using an IP multimedia subsystem of the circuit system based on the exchange bearer traffic, including: A, IMS terminal module using the user terminal CS bearer in the IMS service initiates the CS bearer to the CS terminal block establishment request; B, after receiving the request the terminal module CS IMS terminal module, the CS domain call control entity interactive establish the CS bearer; C, the CS domain call control entity routing the call will be established CS bearer and the IMS domain to the CS domain interworking gateway at; D, CS domain and the IMS domain interworking gateway to establish a CS call into a CS bearer and IMS domain session connection to the terminal control module initiates an IMS CS bearer establishment.

E、IMS终端模块收到CS域与IMS域互通网关转发的CS承载建立的IMS回呼后完成与CS域与IMS域互通网关及与对端用户间两段IP多媒体子系统会话间的关联控制,令对端用户将其与本端用户间IP多媒体子系统会话中交互的媒体流传递到CS域与IMS域互通网关上,利用CS域与IMS域互通网关与CS终端模块间建立的CS承载传送到本端用户。 E, IMS terminal module receives the CS domain and the IMS domain interworking gateway forwards the CS bearer establishment complete IMS and the CS domain and the IMS domain and the interworking gateway to the association between an IP multimedia subsystem session between two end users control the callback , so that between the peer user to the local user with an IP multimedia subsystem session interactive media stream to the CS domain and the IMS domain interworking gateway, the CS domain and the interworking gateway between the CS and the CS terminal modules establish an IMS domain carrier to transfer to the end user.

本发明所述的方法还包括:分别为IMS终端模块和CS终端模块分配电话号码并保存,所述的为IMS终端模块分配的号码为属于其签约的网络,所述的为CS终端模块分配的电话号码为其在CS签约的国际移动台ISDN号码MSISDN。 The method of the present invention further comprises: telephone numbers are assigned to an IMS terminal module and the terminal module and store CS, the IMS terminal block number is assigned to a network belonging to its subscription, allocated to the CS terminal module telephone number MSISDN its international mobile station ISDN number in the CS contract.

所述的为IMS终端模块分配的电话号码包括:区域识别前缀和/或业务类型前缀。 The phone number assigned to an IMS terminal module comprising: a region identification prefix and / or service type prefix.

本发明中,在执行所述的步骤A之前还包括:IMS终端模块判断IMS业务中需要交互的是否包含有需要通过CS承载传输的媒体流,如果有,则执行步骤A,否则,不执行步骤A。 In the present invention, prior to performing said step A further comprises: IMS terminal module determines that IMS services are required need to interact with the media stream if the CS bearer transport, if yes, step A, otherwise, the step is not performed A.

所述的IMS终端模块在准备发起IMS会话、接到IMS会话请求或者在已经建立的IMS会话中准备发起重协商或接到对端的重协商请求时,进行是否包含有需要通过CS承载传输的媒体流的判断。 IMS terminal according to module ready to initiate an IMS session, or preparing to initiate an IMS session request or to the re-negotiation of the end when the renegotiation request, the media contains necessary through the CS bearer transport in the IMS session is established in Analyzing stream.

本发明中,当IMS终端模块与CS终端模块各自独立设置时,则执行所述的步骤A之前还包括:IMS终端模块获取CS终端模块的MSISDN号码信息,所述的获取过程在IMS终端模块每次发起CS承载建立请求之前完成,或在IMS终端模块和CS终端模块启动时一次性完成。 Prior to the present invention, when an IMS terminal and the CS terminal block module is independently provided, is performed according to step A further comprises: obtaining IMS terminal module CS terminal module MSISDN number information acquisition process in the IMS terminal of each module before completion of the initiated CS bearer setup request, or upon completion of a one-time IMS terminal module and the CS terminal module startup.

本发明中,步骤A所述的CS承载建立请求中包括:所述IMS终端模块的承载能力指示信息;并且当CS终端模块不能直接访问IMS终端模块的号码存储模块时,所述的CS承载建立请求中还包括为该IMS终端模块分配的电话号码;所述的CS承载建立请求中还可选地包括:所述IMS终端的初始会话协议统一资源定位符地址信息。 In the present invention, the step A a CS bearer setup request comprising: the bearer capability indication information module IMS terminal; and when the CS terminal block module can not directly access the IMS terminal number storage module to establish the CS bearer request further includes a telephone number assigned for the IMS terminal module; the CS bearer establishment request further optionally comprising: a uniform resource locator address information of the IMS session initiation protocol terminal.

所述的步骤B包括:CS终端模块向CS域呼叫控制实体发起CS承载建立请求,所述的请求中包括被叫号码信息和承载能力指示,并可选地包括通过用户到用户信令携带IMS初始会话协议统一资源定位符地址;其中,所述的被叫号码信息为为所述IMS终端模块分配的电话号码,所述的承载能力指示为该IMS终端模块要求的承载能力。 Said step B comprising: CS terminal module to the CS call control entity initiates a CS bearer establishment request, the request includes a called number information and bearer capability indication, and optionally including an IMS by a user to user signaling session initiation protocol uniform resource locator address; wherein the called number information assigned to the telephone number of the IMS terminal module, the bearer capability indication for the IMS terminal module carrying capacity requirements.

所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息确定将建立的CS承载配置为路由到CS域与IMS域互通网关处。 Said step C comprising: CS domain call control entity determines to establish a CS bearer configured to route to the CS domain and the IMS domain interworking gateway, the CS bearer establishment request according to the called number information.

所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息中区域识别前缀或业务类型前缀确定将建立的CS承载配置为路由到用户归属区域或最近的CS域与IMS域互通网关处。 Said step C comprising: CS domain call control entity to establish request called number prefix or area identification information according to the service type prefix of determining the CS bearer establish a CS bearer configured to route the subscriber's home area or to the nearest CS domain and IMS domain interworking gateway.

所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息中业务类型前缀进行配置,禁止在CS域签约的主叫用户侧的补充业务对建立用于IMS业务中部分媒体流传递的CS承载的呼叫产生影响。 Said step C comprising: CS domain call control entity in the called number establishment request message configured according to the service type prefix of the CS bearer, the CS domain supplementary services prohibited sign calling for the establishment of the user-side IMS call service in the CS bearer portion of a media stream transmitted impact.

所述的步骤D包括:CS域与IMS域互通网关获得控制发起CS承载建立的IMS终端模块的IMS域公有标识,并根据所述IMS域公有标识将建立CS承载的CS域呼叫转化为IMS域会话并按照IMS域会话处理流程接续到控制发起CS承载建立的IMS终端模块;并按照承载能力指示为接收被叫侧IMS域交互媒体流预留端口资源。 Said step D comprising: CS domain and the IMS domain interworking gateway to obtain the control module initiates the CS bearer established by the IMS terminal an IMS domain Public Identity and IMS domain according to the public user identity will be established CS call to the CS bearer conversion IMS domain IMS domain session according to the session and the process flow continues into the control module initiates an IMS terminal CS bearer establishment; and to receive an indication of a called-side IMS domain interaction media stream port resources in accordance with reservation carrying capacity.

所述的步骤D还包括:CS域与IMS域互通网关发往发起建立CS承载的IMS终端模块的IMS会话建立请求消息中携带有对应的CS终端模块MSISDN号码以及对会话中交互媒体流的会话描述协议指示,该会话描述协议指示中包含了CS域与IMS域互通网关上为接收被叫侧IMS域交互媒体流预留的IP地址和UDP端口信息。 Said step D further comprises: CS domain interworking gateway and the IMS domain initiates a IMS session sent to the IMS terminal module CS bearer establishment request message carries the terminal CS corresponding to the MSISDN number and module of an interactive media session session stream description protocol indication, indicating that the session description protocol contains an IP address and UDP port information of the CS domain and the IMS domain interworking gateway the IMS domain of the called side to receive a media stream interaction reserved.

所述的步骤D还包括:CS域与IMS域互通网关通过根据呼叫建立请求中被叫号码填写的IMS终端模块电话号码查询电话号码映射服务器得到IMS终端模块的IMS域公有标识;或者,CS域与IMS域互通网关通过CS域呼叫建立请求中用户到用户信令中传递的内容直接得到IMS终端模块的IMS域公有标识。 Said step D further comprises: CS domain and the IMS domain through interworking gateway establishment request in the called number filled in the IMS terminal telephone number query module ENUM server IMS terminal module to obtain the IMS domain public identifier according to the call; or, CS domain interworking gateway and the IMS domain user setup request content delivery to the user signaling directly IMS domain public identifier of the IMS terminal through the CS domain call module.

本发明中,在执行所述的步骤D之前还包括:所述的CS域与IMS域互通网关根据是否配置该IMS终端模块的电话号码转换数据确定该用户是否有权使用在IMS会话中使用CS承载业务,如果配置所述转换数据,则有权使用。 In the present invention, prior to performing said step D further comprises: the CS domain and the IMS domain interworking gateway is configured in accordance with the IMS terminal modules converting the telephone number data determines whether the user is entitled to use an IMS session in the CS bearer service, if the configuration of the data conversion, the right to use.

所述的步骤D包括:CS域与IMS域互通网关发往发起CS承载建立的IMS终端模块的IMS会话建立请求消息中携带的会话描述协议指示中包含了专用指示信息,IMS域代理呼叫与会话控制功能实体根据所述的专用指示信息识别经由CS承载的媒体流并在资源预留上进行相应处理;所述的专用指示信息采用的实现方式包括:对会话描述协议SDP进行扩展定义。 Said step D comprising: CS domain interworking gateway and the IMS domain initiates an IMS session sent to the IMS terminal CS bearer establishing module establishes a session description protocol message carries request indication contains a specific indication information, the IMS domain and a proxy call session control function entity identification information via the media stream according to specific CS bearer and an indication of the corresponding processing in the resource reservation; implementations using the dedicated instruction information includes: the session description protocol SDP extended definition.

所述的步骤E包括IMS终端模块判断确定所接到的IMS会话建立请求消息为其先前的CS承载建立请求过程的IMS回呼,以背靠背用户代理B2BUA模式关联处理与对端用户及与CS域与IMS域互通网关间的两段IMS域会话建立过程:IMS终端模块利用CS承载建立IMS回呼的会话建立请求消息中提供的会话描述协议指示作为其对应的IMS会话中申请采用CS承载的媒体流的本侧描述指示,处理与对端用户间的IMS域会话建立过程;IMS终端模块利用与对端用户间IMS会话建立过程中得到的关于其申请采用CS承载的媒体流的对端的会话描述协议指示,作为本侧描述指示,处理与CS域与IMS域互通网关间的IMS域会话建立过程。 Step E comprises the IMS terminal determining module determines to an IMS session establishment request message to its previous CS bearer establishment request procedure IMS call back, back to back User Agent B2BUA mode processing associated with the peer user and the CS domain the process of establishing a session between two IMS domain IMS domain interworking gateway: IMS session termination module using the CS bearer establishing an IMS call-back session description protocol establishment request message indication provided as an IMS session corresponding CS bearer media application using this side describes the flow indication, the processing and the process of establishing an IMS domain session between the end user; IMS terminal module using session description of the IMS session establish the peer on which the application uses the media stream CS bearer obtained during the inter-end user protocol indicates, the present description indicates the side, the session between the IMS domain and the CS domain processing interworking gateway and the IMS domain establishment procedure.

所述的步骤E还包括:IMS终端模块接到CS域与IMS域互通网关的IMS会话建立请求后,根据消息中携带的对应的CS终端模块的MSISDN号码确定该IMS会话建立请求是其先前的CS承载建立请求过程对应的IMS回呼。 Said step E further comprises: the CS domain to the IMS terminal module and the IMS session establish request to the IMS domain interworking gateway, the IMS session establishment request is determined according to the MSISDN number carried in the message corresponding to the CS terminal is its previous module CS bearer establishment request process corresponding IMS call back.

本发明所述的方法还包括:CS域的计费系统根据CS终端模块发起的CS域呼叫中主被叫号码的关联关系确定该次呼叫为IP多媒体子系统会话中使用的CS承载建立导致的呼叫,并进行与IMS会话关联的计费批价处理。 The method of the present invention further comprises: CS domain charging system determines that the current call is an IP Multimedia Subsystem session established using a CS bearer lead terminal according to the link module CS CS call initiated by the calling and called numbers of call, with the billing and rating processes associated with IMS session.

本发明所述的方法还包括:当控制发起CS承载建立的IMS终端模块不支持3GPP要求的部分初始会话协议扩展时,所述的CS域与IMS域互通网关还需要支持通过与该IMS终端模块间端到端流程协商过程完成IMS域回呼的建立。 The method of the present invention further comprises: when the control portion initiates IMS session initiation protocol termination module to establish the CS bearer is not supported by 3GPP requirements extended, the CS domain and the IMS domain through interworking gateway also needs to support the IMS terminal block inter-end process to complete the negotiation process to establish IMS domain call back.

本发明所述的方法还包括:当控制发起CS承载建立的IMS终端模块不支持3GPP要求的部分初始会话协议扩展时,所述的CS域与IMS域互通网关与该IMS终端模块间端到端流程过程采用预先查询对端能力方式实现,或者,采用收到不支持所要求的扩展的失败指示后重新发起不要求该扩展的会话建立请求方式实现。 The method of the present invention further comprises: when the control portion initiates IMS session initiation protocol termination module to establish the CS bearer is not supported by 3GPP requirements extended, the CS domain and the IMS domain between the interworking gateway and the IMS terminal end module after re-initiate flow process using pre-query capability to end manner, or, using the extended failure indication does not receive the required support does not require the extended session establishment request ways.

本发明所述的方法还包括:在与对端IMS终端间的呼叫过程结束时,则由控制发起CS承载建立的IMS终端模块指示CS终端模块发起释放CS终端模块和CS域与IMS域互通网关间的CS承载,以及CS域与IMS域互通网关与控制发起CS承载建立的IMS终端模块间的IMS连接。 The method of the present invention further comprises: when a call procedure between an IMS terminal end of the end, by the control module initiates the CS bearer establish indication IMS terminal CS CS terminal module initiates the release of the terminal module and the CS domain and the IMS domain interworking gateway bearer between the CS and the CS domain and the IMS domain initiates IMS interworking gateway connected between the control terminal module of the IMS CS bearer establishment.

本发明所述的方法还包括:当CS域呼叫控制实体和CS域与IMS域互通网关为同一实体时,执行所述的步骤B后,直接执行所述的步骤D。 The method of the present invention further comprises: when the CS domain call control entity and the CS domain and the IMS domain interworking gateway entity of the same, after performing the step B, the step of performing the direct D.

本发明还提供了一种CS终端模块与互通网关间CS承载异常时的处理方法,包括:F、CS终端模块和CS域呼叫控制实体间互通释放出现异常的CS承载;G、CS域呼叫控制实体和CS域与IMS域互通网关间互通释放转接呼叫;H、CS域与IMS域互通网关释放与控制发起CS承载建立的IMS终端模块间的IMS会话连接;I、在控制发起CS承载建立的IMS终端模块上利用重协商过程重新建立分组交换PS承载进行原来利用CS承载的那部分媒体流的传输。 The present invention further provides a processing method when a terminal module and an inter-CS interworking gateway the CS bearer abnormalities, comprising: F, CS terminal module and the CS domain call control entity interworking between abnormal release CS bearer; G, the CS domain call control inter-entity and the CS domain and the IMS domain interworking gateway interworking release the transferred call; H, CS domain and the IMS domain interworking gateway releases the IMS control initiates an IMS session between the terminal connection module to establish the CS bearer; I, initiates a CS bearer establishment control re-establishing the PS bearer for packet switched transmission of the original portion of the media stream using the CS bearer by the re-negotiation process on the IMS terminal module.

所述的步骤I包括:通知对端IMS用户停止相应部分媒体流的发送;在会话内发起更改交互媒体流的请求,完成相应的PS承载资源的申请和建立,并通过通知对端将媒体流改向将原来利用CS承载传递的媒体流改由PS承载传递;在所述PS承载建立完成后,通知对端用户恢复相应部分媒体流的发送。 Said step I comprises: a notification to an IMS user terminal to stop sending the corresponding part of the media stream; initiating a request to change the interactive media streams within a session, to complete the corresponding PS bearer establishment and application resources, and by informing the end of the media stream redirecting the original transmission using the CS bearer media stream transmitted replaced by the PS bearer; after the PS bearer is established, the user notifies the peer to resume sending the media stream corresponding portion.

由上述本发明提供的技术方案可以看出,本发明提供了一个终端到网关,终端控制模式下在IMS会话中利用CS承载IMS业务的具体的实现方案,包括CBCF在用户终端中的具体实现形式,以及在终端和相关CS/IMS域网元(CS域呼叫控制实体或IMS域呼叫控制实体)配合下综合CS承载与IMS的具体实现过程;同时,本发明还对于用户漫游情况下可能出现的CS路由迂回问题、CS/IMS计费关联实现问题、非标准终端接入以及CS承载异常情况下相应处理等问题均提供了具体的解决方法。 Provided by the technical solution of the present invention can be seen, the present invention provides a specific implementation of a terminal to the gateway, the terminal control mode using the CS bearer in the IMS session in IMS services, including CBCF embodied in the form of a user terminal and in the terminal and related CS / IMS domain network element (CS domain call control entity or IMS domain call control entity) with the integrated CS bearer and the IMS specific implementation; the same time, the present invention also may appear for the user roaming case CS circuitous routing problem, charging correlation CS / IMS implementation issues, as well as non-standard terminal access exceptions corresponding CS bearer handling problems both provide specific solutions. 因此,本发明为通过CS承载传输IMS业务提供了一种实际应用处理过程中的可行的技术方案。 Accordingly, the present invention provides a feasible technical solution of a practical application of the process to carry traffic transmitted by IMS CS.

附图说明 BRIEF DESCRIPTION

图1为综合业务的示意图;图2为3GPP TS 23.899中综合业务逻辑功能示意图;图3为本发明所述的系统的结构示意图;图4为本发明中建立CS承载的过程示意图;图5为本发明中CS承载异常情况下的处理过程示意图;图6为本发明中发起端IMS TM不支持SIP协议扩展时的处理过程。 3 a schematic structural diagram of the system of the present invention;; FIG. 1 is a schematic diagram of an integrated services; FIG. 2 is a 3GPP TS 23.899 integrated business logic in a schematic functional diagram of the CS bearer establishment process of the present invention, FIG. 4; FIG. 5 is a in the present invention, the process of the CS bearer schematic abnormal condition; FIG. 6 of the present invention, the initiator IMS TM does not support the SIP protocol processing when extended.

具体实施方式 Detailed ways

本发明核心是提供一种在IMS中利用CS承载业务的系统及方法,即提供了一种满足3GPP TS 23.899相关要求的具体实现方案,其中对于利用CS承载实时业务的过程中涉及的用户漫游情况下路由迂回、CS域和IMS域计费关联、非标准终端接入以及CS承载异常情况下的相应处理方式均给出具体的解决方法。 The core of the present invention to provide a system and method for using the CS bearer in the IMS service, i.e. providing a meet the requirements of 3GPP TS 23.899 concrete implementation, wherein the roaming user according to the CS bearer for real-time services in case where the process of circuitous routing, charging correlation of the CS domain and IMS domain, and a corresponding non-standard terminal access handling abnormal situation in the CS bearer specific solutions are given.

本发明所述的系统如图3所示,主要包括:实现CBCF功能的IMS TM(IMS终端模块)、实现CBOF功能的CS TM(CS终端模块)、CS域呼叫控制实体及实现CBTF功能的CS域与IMS域互通网关;其中,所述的CS域呼叫控制实体(如图3中的MSC)和CS域与IMS域互通网关(MGCF/IM-MGW)为网络中现有的结构实体,但在本发明中需要所述的CS域呼叫控制实体和所述互通网关与本发明中各自独立设置的IMS TM和CS TM配合实现本发明,图3中,粗实线表示CS承载和信号路径,细实线表示PS承载路径,虚线表示SIP消息路径,当IMS业务中出现需要通过CS承载在两端用户间交互的媒体流时,则可以通过图3中粗实线所表示的CS承载进行承载传输;其中,所述系统中的CS域呼叫控制实体可与CS终端模块交互并建立CS承载,并将由IMS终端模块控制CS终端模块发起建立的CS承载路由到CS域与IMS域互通网关上,即在网络中从CS终 The system of the present invention is shown in Figure 3, including: IMS CBCF implement functions TM (IMS termination module) to realize functions CS CBOF TM (CS terminal module), CS domain call control entity and the CS CBTF realize functions domain interworking gateway and the IMS domain; wherein, the CS call control entity (in FIG. 3 MSC) and the IMS domain and CS domain interworking gateway (MGCF / IM-MGW) for the existing network configuration entity, in the present invention requires the CS domain call control entity and the gateway interworking with the present invention, provided independently IMS TM and the CS (TM) achieved with the present invention, FIG. 3, a thick solid line denotes the CS bearer and the signal path, thin solid line indicates the PS bearer path, the broken line represents the path a SIP message, CS through the CS bearer required at both ends of the user interaction between the media stream, may be represented by a thick solid line in FIG. 3 occurs when the IMS bearer service in the bearer transmission; wherein, the CS domain call control entity in the system may interact with the CS terminal module and establishing a CS bearer, and the module is controlled by the IMS terminal CS terminal module initiates the CS domain and the IMS domain interworking gateway to establish a CS bearer route, i.e. from the CS network final 端经CS呼叫控制实体到CS域与IMS域互通网关间建立一条CS承载路径;所述CS域与IMS域互通网关可将CS域呼叫控制实体控制路由到本端的CS呼叫转换到IP多媒体子系统会话,并将会话控制信令经IP多媒体子系统会话控制实体接续到控制发起该过程的IMS终端模块,所述的将会话接续到所述IMS终端的过程可以通过图3中标示为2的细实线和虚线路径完成;本发明所述系统中分别建立的IMS TM和CS TM也就是将支持在IMS会话中利用CS承载的用户终端在逻辑上划分的两部分;其中,IMS TM用于实现CS承载控制功能,在IP多媒体子系统业务中判断并控制CS终端发起CS承载的建立过程,并在后续收到CS域与IMS域互通网关转发的回呼后完成与CS域与IMS域互通网关及与对端用户间两段IP多媒体子系统会话间的关联控制,令对端用户将其与本端用户间IP多媒体子系统会话中交互的媒体流首先 End by the CS call control entity to the CS domain and the IMS domain between the interworking gateway to establish a CS bearer path; the CS domain and the IMS domain interworking gateway the CS call may be routed to the control entity controls the CS call the local switch to an IP multimedia subsystem process session, and the session control signaling via an IP multimedia subsystem session control entity initiates an IMS connection to the control terminal module of the process, according to the IMS session connection terminal 2 can be marked by a fine FIG 3 solid and broken lines path is completed; the system of the invention were established IMS TM and the CS (TM) is the use of two support parts of the user terminal on the CS bearer in the IMS session logically divided; wherein, for implementing IMS TM CS bearer control function, judges and controls CS terminal initiates a process of establishing the CS bearer services in an IP multimedia subsystem, and the subsequent receipt of callback CS domain interworking gateway and the IMS domain and the CS domain forwards the complete interworking gateway and the IMS domain and between the end user and for the associated control between two IP multimedia subsystem session, so that between the peer user to the local user with an IP multimedia subsystem session interactive media stream is first 递到CS域与IMS域互通网关上,利用CS域与IMS域互通网关与CS TM间建立的CS承载传送到本端用户(即发起CS承载建立过程的IMS TM);CS TM作为电路交换承载建立的发起端,用于根据IMS终端模块的指令发起CS承载的建立请求,并与CS域呼叫控制实体进行相应的交互完成CS承载的建立过程;IMS TM和CS TM既可以集成在同一终端中,也可分离;分离方式下IMSTM可以采用但不限于以下方式实现:PC(主机)或PDA(个人数字助理),即采用内置于PC或PDA中的软件实现所述的IMS TM,且所述IMS TM与3G终端(即CS TM)间可以采用但不限于蓝牙等短距离无线连接;IMS TM实现CBCF(电路承载控制功能),在IMS会话处理过程中判断并指示CS TM发起CS承载建立/释放,并由IMS TM、CS TM、CS域呼叫控制实体以及CS域与IMS域互通网关MGCF/IM-MGW共同完成相关过程,建立作为CBOF(电路承载发起功能)的CS TM到作为CBTF的MGCF/I Handed over CS domain and the IMS domain interworking gateway, using the CS domain between the CS domain and the IMS interworking gateway and the CS bearer establishment (TM) to transfer to the end user (i.e. CS bearer establishment procedure initiates the IMS TM); CS TM as a circuit switched bearer establishing the initiator configured to initiate the CS bearer establishment request according to an instruction IMS terminal module and the CS domain call control entity interactive corresponding CS bearer establishment procedure is completed; IMS and CS (TM) (TM) may be integrated in the same terminal , may also be separated; IMSTM the separation means may be employed, but is not limited to the following manner: PC (host computer) or a PDA (personal digital assistant), i.e. with built-in implementing the IMS TM in the software or PC PDA, and the between the IMS TM and the 3G terminal (i.e., CS (TM)) may be employed but are not limited to, Bluetooth, a short-range wireless connection; IMS TM to achieve CBCF (circuit bearer control function), is determined and indicated CS (TM) to initiate a CS bearer established IMS session processing / releasing, by the IMS TM, CS TM, CS domain call control entity and the CS domain and the IMS domain interworking gateway MGCF / IM-MGW associated together to complete the process of establishing a MGCF CBOF (originating circuit bearing function) to CS (TM) as the CBTF / I M-MGW间的CS承载,并将在MGW上为IMS域交互媒体流预留的地址和端口信息传递到IMS TM,IMS TM作为CBCF在后续处理中采用B2BUA(背靠背用户代理)方式控制两个IMS会话使得对端用户将媒体流传递到MGW对应地址端口;同时,还需要为用户终端中的CS TM和IMS TM分别分配相应的E.164号码(即电话号码),其中为CS TM分配的E.164号码为该用户在CS域签约的MSISDN(移动台国际ISDN号码),为IMS TM分配的E.164号码属于该用户签约的网络,并在CS域相关呼叫处理节点配置被叫分析数据使得该节点能将对该号码的呼叫路由到CS/IMS互通的网络节点;为CS TM和IMS TM分配的E.164号码可以分别存储在各自对应存储模块中;当然,在IMS TM和CS TM集成在同一终端的情况下,也可以将所述号码均存储在CS TM和IMS TM共享的数据区域中;由于本发明中采用终端控制模式,即由IMS TM控制CS承载的建立和释放过程, CS bearer between the M-MGW, and the IMS domain transfer reservation interactive media stream address and port information to the IMS TM as the MGW, IMS TM as CBCF employed in the subsequent processing B2BUA (back to back user agent) controls the two IMS session end user such that the media stream to the MGW corresponding to the address port; it is also necessary for the user terminal in the CS TM and the IMS TM allocated a respective E.164 number (i.e., telephone number), respectively, wherein the CS TM is assigned E.164 numbers in the CS domain for the user subscribed MSISDN (mobile station international ISDN number), E.164 number assigned for the IMS TM subscribed users belonging to the network, and the called party analysis data is configured at the CS domain call processing nodes associated so that the node can route the call to the number of CS / IMS interworking network node; CS TM and the E.164 number for the IMS TM allocated may be stored in each corresponding storage module, respectively; of course, the IMS TM and the CS TM in the case of the same integrated terminal, the number may be stored in both CS and IMS TM (TM) shared data area; present invention, since the terminal control mode employed, i.e., by the IMS TM controls the establishment and release of the CS bearer, 此,可以将网络为IMS TM分配的电话号码并在ENUM(电话号码映射)服务器中配置相关数据(即配置IMS TM模块的电话号码与其IMS域公有标识对应关系的转换数据)的过程作为运营端对用户终端使用CSI(综合CS承载和IMS)业务的授权,即当在ENUM服务中查询到所述的IMS TM的电话号码的转换数据时,则确定允许该IMS TM开展CSI业务。 This may be network IMS TM allocated telephone number and the configuration data server in the ENUM (Telephone Number Mapping) (i.e. arranged IMS TM module telephone number to its IMS domain public identifier corresponding to the conversion data relationships) of the process as operating end use CSI (integrated CS bearer and IMS) service authorization of the user terminal, i.e., when the query to the data conversion of the telephone number of the IMS TM in the ENUM service, then the IMS TM determines to allow carry the CSI service.

本发明中,将支持在IMS业务中利用CS承载的终端划分为IMS终端模块和CS终端模块两部分并定义了两部分间的接口交互,以及CS终端模块在IMS终端模块的控制下与CS域呼叫控制实体以及CS域和IMS域互通网关交互过完成CS承载的建立进而用于IMS业务的具体过程,因此,本发明便可以在IMS中利用CS承载实时业务,以满足实时业务的可靠性要求。 The present invention will support the use of terminal CS bearer in the IMS service are divided into two parts IMS terminal module and the CS terminal module and defines the interface interaction between the two parts, and the CS terminal module under control of IMS terminal module and the CS domain the call control entity and the CS domain and IMS domain interworking gateway through the specific interaction process is completed establishing a CS bearer for the IMS service further, therefore, the present invention can use a CS bearer reliability real-time services to meet real-time service in IMS .

下面将结合附图对本发明所述的方法进行详细说明,本发明中,利用CS承载实时业务的具体处理过程如图4所示,包括以下步骤:步骤41:作为CS承载控制功能实体的IMS TM判断是否需要发起CS承载建立过程,如果需要,则执行步骤42;所述的IMS TM在准备发起IMS域会话、接收到IMS域会话建立请求或者在IMS会话中准备发起重协商或收到对端重协商请求新增交互媒体流时,根据准备交互的媒体流或对方要求交互的媒体流是否需要通过CS承载传输确定是否发起CS承载建立过程,也就是根据所述媒体流中是否带有实时多媒体业务流通讯成分决定是否发起CS承载建立过程,当确定需要发起CS承载建立过程时,执行步骤42,否则,不执行步骤42;具体可以根据所述的媒体流中的业务类型确定其是否为实时多媒体业务流,例如,如果媒体流中包含语音信息,则可以确定为媒 The following method of the present invention is described in detail in conjunction with the accompanying drawings, the present invention, by using the CS bearer specific process real-time services shown in Figure 4, comprising the following steps: Step 41: As a CS bearer control function entity of the IMS TM determine the need to initiate the CS bearer establishment procedure, if necessary, execute step 42; the IMS TM in the IMS domain initiates a session ready to receive the session establishment request to the IMS domain or preparing to initiate an IMS session renegotiation in or received from the peer when the re-negotiation request to add interactive media stream, media stream according to prepare interactive or other requirements of the interactive media streams need to determine whether to initiate the CS bearer establishment procedure by transmitting CS bearer, i.e. real-time multimedia accordance with whether the media stream traffic flow communication component determines whether to initiate the CS bearer establishment process when it is determined CS bearer establishment procedure needs to be initiated, step 42, otherwise, step 42 is not performed; may specifically determine whether it is real-time media stream according to the service type in multimedia traffic flow, e.g., if the media stream includes voice information, it may be determined for the media 流中包含实时多媒体业务流。 Stream contains real-time multimedia traffic flows.

步骤42:IMS TM与CS TM交互获得并存储所述CS TM的MSISDN;所述交互过程可在每次CS承载建立请求之前完成,也可在用户终端(包含IMS TM与CS TM)启动后一次性完成,并在此后一直将获取的所述CSTM的MSISDN缓存在IMS TM内,以便于后续的业务开展应用;如果IMS TM和CS TM集成在同一终端中,且采用共享数据区域存储IMSTM和CS TM各自的E.164号码时,则可以省略该步骤涉及的交互过程。 Step 42: IMS TM TM obtained interact with CS CS (TM) and of storing the MSISDN; the interaction process may be completed before the bearer establishment request each CS, the user terminal may be (including IMS TM and the CS (TM)) after the first start Completions, and since then has acquired the CSTM MSISDN of the IMS TM in the cache, in order to carry out the subsequent service application; if the IMS TM and the CS terminal (TM) integrated in the same, and the use of a shared data storage area, and CS IMSTM TM is the respective E.164 number may be omitted in this step involves interaction.

步骤43:IMS TM向CS TM发起CS承载建立请求,在请求中携带分配给该IMS TM的E.164号码以及相应的承载能力指示信息;当CS终端模块不能直接访问IMS终端模块的号码存储模块时,则所述的IMS TM发送的CS承载建立请求中还包括为该IMS终端模块分配的电话号码;在IMS TM向CS TM发起的CS承载建立请求中,还可以根据需要携带IMS TM的SIP URL(初始会话协议统一资源定位符)地址,以方便CS域与IMS域互通网关的处理。 Step 43: IMS TM CS (TM) to initiate a CS bearer establishment request carrying the request to the allocated E.164 number of the IMS TM and the corresponding bearer capability indication information; CS terminal number storage module when the module can not directly access the IMS terminal block when, according to IMS TM is the CS bearer setup request transmitted further includes a dispensing module for an IMS terminal telephone number; the IMS TM to initiate the CS TM CS bearer establishment request, the IMS TM can also carry the SIP needed URL (session Initiation protocol uniform resource locator) address, in order to facilitate the processing of the CS domain and IMS domain interworking gateway.

步骤44:CS TM接收到IMS TM的请求后,按照标准的CS域流程发起呼叫,其中,被叫号码和承载能力指示根据IMS TM发来的请求进行填写,所述的被叫号码为所述的IMS TM的电话号码,所述的承载能力指示为IMS TM要求的承载能力;在CS TM向CS域呼叫控制实体发起的呼叫建立请求中,可以通过UUS(用户到用户信令)携带IMS TM的初始会话协议统一资源定位符SIP URL地址,以方便CS域与IMS域互通网关的处理;步骤45:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息确定将建立的CS承载配置为路由到CS域与IMS域互通网关处;也就是CS域呼叫控制实体(如MSC等)分析CS TM发起的呼叫中的被叫号码,即发起CS承载建立过程的IMS TM的电话号码,根据对被叫号码的分析数据,配置将该呼叫路由到CS域与IMS域互通网关MGCF/IM-MGW上,从而使得CS承载与所述CS域与IMS域互通网关连通;在 Step 44: after receiving the IMS TM (TM) CS request, the CS domain according to standard procedure call, wherein the called number and the bearer capability indication to fill IMS TM according to a request sent, according to the called number the telephone number of the IMS TM, bearer capability indication of the bearing capacity requirement of the IMS TM; (TM) in the CS establishment request initiated by a call control entity to the CS domain call, via the UUS (user to user signaling) carried IMS TM the session initiation protocol SIP URL uniform resource locator address, to facilitate the handling of the CS domain and the IMS domain interworking gateway; step 45: CS CS domain call control entity determines in accordance with the established CS bearer setup request to the called number information configured to route bearer and the IMS domain to the CS domain interworking gateway; i.e. CS domain call control entity (e.g., MSC, etc.) analyzes the called number of the call originating CS (TM), i.e., initiate a CS bearer establishment procedure IMS TM telephone number the analytical data of the called number and routes the call to the configured CS domain and the IMS domain interworking gateway MGCF / IM-MGW, so that the CS bearer in communication with the CS domain and the IMS domain interworking gateway; in 步骤中,CS域呼叫控制实体可以根据对IMS TM号码特殊前缀(如业务类型前缀等)的分析将呼叫转接到较近的MGCF/IM-MGW,即在对被叫号码进行分析的数据中,将相应的业务类型前缀配置为路由到最近的MGCF/IM-MGW,从而避免CS承载的路由迂回;在该步骤中,CS域呼叫控制实体还可以根据对IMS TM号码特殊前缀(如区域识别前缀等)的分析将相应的CS承载配置为路由到IMS TM归属区域的MGCF/IM-MGW;当然,如果所述的CS域呼叫控制实体与MGCF/IM-MGW为同一实体时,本发明中,还可以省略步骤45,即执行完成所述的步骤44后,直接执行后续的步骤46;步骤46:所述的互通网关MGCF/IM-MGW根据被叫号码进行ENUM(电话号码映射)服务器查询,得到用户IMS域公有标识,按IMS域标准互通流程指示IM-MGW为被叫侧(发起CS承载建立过程侧)媒体流预留端口资源,并将IMS会话接续到控制发起CS承载建立的I Step, the CS domain call control entity can be a call to close MGCF / IM-MGW according to the analysis of the IMS TM special prefix number (such as a service type prefix, etc.), i.e., the analysis of the called number in the data the corresponding service type prefix is ​​configured to route to the nearest MGCF / IM-MGW, to avoid routing the CS bearer detour; in this step, CS domain call control entity can also be (e.g., region identification according to the special prefix IMS TM number analysis prefixes) of the corresponding CS bearer configured to route to the home area MGCF IMS TM / IM-MGW; of course, if the CS domain call control entity and the MGCF / IM-MGW are the same entity, in the present invention , step 45 may be omitted, i.e., after the completion of step 44, step 46 directly perform the subsequent; step 46: the interworking gateway MGCF / IM-MGW for the ENUM (telephone number mapping) server query according to the called number to give the user the IMS domain public identifier of the IMS domain according to the standard interworking procedure IM-MGW indicates the called side (the side initiate a CS bearer establishment procedure) to reserve the media stream port resources and an IMS session connection to initiate a CS bearer establishment control I MS TM,即所述的互通网关向发起CS承载建立过程的IMS TM发送IMS会话建立请求消息;所述的IMS会话建立请求消息中SDP(会话描述协议)指示了在IM-MGW上为接收被叫侧IMS域交互媒体流预留的IP地址和UDP(用户数据报协议)端口信息,以便于被叫侧发来的媒体流可以利用相应的端口资源向对端发送;所述的IMS域公有标识是SIP URL形式,在IMS域中采用的是SIP URL寻址;因此,如果CS TM在发起CS域呼叫时通过UUS携带IMS TM的SIP URL地址,且网关配置处理此信息,则所述互通网关中的MGCF也可直接从UUS中获得IMS TM的IMS域公有标识,从而省略查询ENUM服务器的过程;但是,同时通过查询ENUM服务器实现业务授权检查的功能便无法实现,即系统中无法通过查询ENUM服务器的过程对IMS TM进行鉴权处理;步骤47:控制发起CS承载建立的IMS TM收到CS承载建立的回呼(即所述的IMS会话建立请求消息) MS TM, i.e. the interworking gateway to the originating carrier CS IMS TM sending IMS session establishment procedure setup request message; the IMS session establishment request message, SDP (Session Description Protocol) indicated in the IM-MGW to receive IP address of the called-side IMS domain and an interactive media stream reserved UDP (user datagram protocol) port information so that the called side can be sent by using a corresponding media stream port sent to the peer resources; the IMS domain public identifying a SIP URL form, in an IMS domain SIP URL addressing is employed; therefore, if the CS (TM) carries SIP URL address of the IMS TM by UUS when initiating a CS call, and the gateway configuration process this information, the interworking gateway MGCF may also be obtained directly from UUS the IMS TM in the IMS domain public identity, so the query process ENUM server omitted; however, while achieving functional service authorization check by querying the ENUM server can not be achieved, that the system can not pass the query ENUM server processes the IMS TM performs authentication processing; step 47: control IMS TM initiates the CS bearer establish the CS bearer establishment receive callback (IMS session establishment request message according i.e.) 与原来与对端用户间的IMS会话关联,并进行后续相关处理,具体的处理过程如下:控制发起CS承载建立的IMS TM通过会话建立请求消息From(源)头域中的MSISDN号码识别IMS会话建立请求为本端请求的CS承载建立过程对应的IMS回呼;控制发起CS承载建立的IMS TM利用CS承载建立IMS回呼INVITE(会话建立请求)消息中CS与IMS互通网关提供的SDP作为其对应的与对端用户间的IMS会话中申请采用CS承载的媒体流的本端会话描述协议指示提供给对端用户,继续处理与对端用户间的IMS域的会话建立过程;IMS TM得到对端的会话描述协议指示后将对应于采用CS承载部分的SDP作为与互通网关间CS承载建立IMS回呼的本端会话描述协议指示提供给网关,作为B2BUA(背靠背用户代理)分别完成与互通网关间CS承载建立IMS回呼和与对端的IMS会话建立过程;通过上述步骤,完成了CS TM和互通网关MGCF/IM-MGW Associated with the original of the IMS session between the end user, and the subsequent correlation process, the specific process is as follows: Control initiates IMS TM CS bearer established IMS session establish MSISDN number identification (source) header field of the request message via the session From establishment request requesting the present terminal CS bearer establishment procedure corresponding to an IMS call back; (TM) IMS CS control initiates the CS bearer establish a bearer establishing an IMS call-back the INVITE (session establishment request) message to a CS IMS interworking gateway as SDP offer corresponding to an IMS session between an end user to apply the present terminal session description protocol CS bearer media stream providing an indication to the remote user, processing continues with the establishment procedure of a session in the IMS domain between the end user; IMS (TM) obtained on inter will SDP indicating the end corresponds to the use of the CS bearer portion of the SDP as a interworking gateway the CS bearer establish a local session description protocol IMS call back indication to a gateway, as the B2BUA (back to back user agent) are respectively finished between the interworking gateway establishment of the CS bearer and the IMS call-back session establishment procedure with the IMS peer; through the above steps, the CS (TM) and the interworking gateway MGCF / IM-MGW CS承载的建立,控制发起CS承载建立的IMS TM作为B2BUA分别完成了与互通网关MGCF/IM-MGW和对端用户间的IMS域会话建立,并在此过程中通过在网关和对端用户间透明传递关于本端决定采用CS承载的媒体流部分的会话描述协议指示(即将网关和对端用户的相应指示分别作为本端指示传递给对端用户和网关),使得对端用户与网关间互为目的地传递该部分媒体流,继而从网关通过与CS TM的CS承载与用户终端间传递。 Establishing a CS bearer, the control initiates IMS (TM) CS bearer established as a B2BUA completed are / IM-MGW, and the establishment and interworking gateway MGCF of the IMS domain session between the end user, and the process by the gateway and between peer user transparent transmission on the local decided to use the session description protocol indicating that the media stream portion of the CS bearer (ie the gateway and the corresponding indication of the end-user are used as the local indication is transmitted to the remote user and gateway), so that the peer user interaction and inter-gateway transmitting the destination portion of the media stream, and then from the gateway through the CS bearer with the CS (TM) and transmitted between a user terminal.

这时便可以在IMS业务中利用所建立的CS承载进行IMS业务的传输了;由于采用CS承载的媒体流实际上不再需要进行本端接入侧的资源预留,对应的SDP中应给出相关指示使得IMS域的P-CSCF(代理呼叫与会话控制功能实体)可以识别经由CS承载的媒体流并在资源预留上做特殊处理;所述指示可以但不限于采用对SDP进行扩展定义的方式实现,例如,利用SDP中已定义的某个描述或多个描述组合,并由P-CSCF根据配置策略进行判断识别需要经CS承载传输的媒体流。 In this case it may be utilized in the IMS service transmitted established CS bearer in the IMS service; CS bearer result of the media stream is actually no need for access to the local side of the resource reservation corresponding to the SDP should the instructions such that the IMS domain P-CSCF (proxy call session control function entity) may identify the media stream via the CS bearer and special treatment on resource reservation; indication may be but not limited to the use of an extended definition of the SDP implementation manner, e.g., by using a SDP description has described a combination of one or more defined by the P-CSCF needs to identify a media stream is determined by the CS bearer transport according to the configuration policy.

本发明中还包括:控制发起CS承载建立的IMS TM在IMS会话结束时通知CS TM完成CS承载的释放;CS TM接收到IMS TM的请求后,按照标准的电路域流程发起呼叫释放,以释放建立的CS承载,同时,由相应的互通网关MGCF完成到IMS TM的IMS域回呼的释放,这样便完成了整个呼叫过程的释放处理。 The present invention further comprises: control notification CS (TM) to complete the release of the CS bearer at the end of an IMS session initiation IMS TM CS bearer establishment; after CS (TM) receiving a request for IMS TM, according to the standard CS domain flow initiated call release to release establishing a CS bearer, while the completion of the corresponding interworking gateway MGCF of the IMS TM to the IMS domain callback released, thus completing the whole process of the call release process.

为便于进行计费处理,本发明中CS域及IMS域还根据CS呼叫中主、被叫号码的关联判断该次呼叫为IMS会话使用的CS承载,例如,其中主叫号码为一个签约用户的MSISDN号码,被叫号码为该签约用户在IMS域签约“在IMS业务中使用CS承载”业务而分配的IMS终端模块的电话号码等,依据上述信息可以进行相应的计费处理,例如,可以将对本次呼叫应用的CS承载的计费免除或附加在IMS业务中进行计费。 In order to facilitate the billing process, according to the present invention, the CS domain and the IMS domain for the call further determines the CS bearer in the IMS session used according to the association in the main, the called number CS call, e.g., wherein a calling number of the subscriber MSISDN number, the called number for the subscriber "using the CS bearer in the IMS service" phone number in the IMS domain IMS subscription service terminal modules allocated the like, according to the above corresponding charging information may be processed, for example, may be the call billing application CS bearer remission or additional charging in the IMS services.

本发明中,为了在用户终端(CS TM和IMS TM)漫游情况下避免出现CS路由迂回的情况,还采用为IMS TM分配的号码使用特殊前缀的方式,如业务类型前缀等,根据所述的前缀即可以识别出所建立的CS承载是为IMS业务中实时性媒体交互所使用,并在CS域呼叫控制实体中配置针对所述特殊前缀的数据分析方式,使得CS域呼叫控制实体可以将相应的呼叫路由到最近的CS域与IMS域互通网关,从而实现就近入网互通。 The present invention, in order to avoid CS circuitous route appears in the user terminal (IMS TM and CS (TM)) roaming cases, by way of using a special prefix number is assigned IMS TM, such as a service type prefix, etc., according to the prefix which can identify the established CS bearer for the IMS service used in the real-time media interaction, and the call control entity configured in the data analysis mode for the special prefix in the CS domain, so that the CS domain call control entity may be appropriate call routing to the nearest CS domain and IMS domain interworking gateway, enabling the nearest network interworking.

另外,本发明中由于CS TM采用在CS域签约的MSISDN发起CS承载建立呼叫请求,还需要考虑CS域主叫侧补充业务的影响,其中对CSI业务有影响的主要有呼出闭锁{包括BO(呼出闭锁补充业务)和ODB(运营商决定的呼出闭锁)}、CUG(闭合用户群)和CAMEL(GSM的移动智能业务),因为上述业务将可能限制该次呼叫的建立或者在该次呼叫中触发智能业务从而引入智能业务的控制和影响(如改号等),为此,同样可采用网络为IMS TM分配号码使用特殊前缀,如代表业务类型的前缀,并在CS域呼叫控制实体中配置针对该前缀的数据分析的方式避免CS主叫侧补充业务对CSI业务CS承载建立过程产生影响;即当确定在CS域签约的MSISDN发起的呼叫中被叫号码中包含该前缀时,则禁止补充业务对其产生影响。 Further, since the present invention is employed in the CS domain (TM) CS subscription MSISDN of the CS bearer establishment initiates a call request, but also need to consider the CS domain supplementary service of the calling side, in which the CSI service are mainly exhaled latch comprises influential {BO ( outgoing call blocking supplementary services) and ODB (operator determined exhalation latch)}, CUG (closed user group) and CAMEL (GSM mobile intelligent service), since the above operations will be possible to limit the time the call is established or at the time the call introducing intelligent service triggering the intelligent service control and influence (e.g., change the number, etc.), for the same network as the IMS TM can be assigned special prefix numbers used as the representative service type prefix, and configuration control entity in the CS domain call CS calling side to avoid the supplementary service prefix for the embodiment of the data analysis of CS bearer establishment procedure CSI service impact; i.e., when it is determined in the CS domain to initiate the signing of the called number MSISDN in the call contains the prefix added is prohibited its business impact.

CS承载建立后并通过所述的CS承载传输IMS业务的过程中,由于网络环境的千变万化,因此,所述的建立的CS承载也就可能出现异常而无法进行正常的业务传输。 After the establishment of the CS bearer and the CS bearer by the process according to the transmission service in the IMS, since the ever-changing network environment, therefore, the established CS bearer may also not be normal and abnormal traffic transmission.

在CS承载异常释放情况下,在CS TM和CS域网元间按CS域标准流程完成呼叫释放,互通网关MGCF释放到IMS TM的IMS域回呼,IMS TM完成该IMS回呼的会话释放,并在与对端用户的会话中通过重协商过程与对端协商业务回落或媒体流改向;下面将对CS承载异常释放情况下,IMS TM的相关处理过程进行描述,如图5所示,具体包括以下步骤:步骤51:CS TM和CS域呼叫控制实体间按CS域标准流程完成呼叫释放,具体包括CS TM与CS呼叫控制实体间的电路域呼叫释放过程步骤51a,以及CS呼叫控制实体与MGCF/IM-MGW间的CS域转接呼叫释放过程步骤51b;步骤52:MGCF释放到IMS TM的IMS域回呼的处理;步骤53:发起端的IMS TM通知对端用户暂停在本端原来通过CS承载传递的媒体流的发送;步骤54:通过重协商过程建立相应的PS承载用于传输相应的媒体流,并通知对端将媒体流改向传递到新建立的PS承载 Carrying abnormal release profile in the CS, the between CS (TM) and the CS domain network elements according to the CS domain the standard process to complete call release interworking gateway MGCF released to the IMS TM in the IMS domain callback, IMS TM completes the IMS call-back session release, and a session with the peer user through the process of re-negotiation service negotiate with the peer or the media stream redirected down; below will release the CS bearer abnormal case, the IMS TM correlation process is described, shown in Figure 5, includes the following steps: step 51: CS TM and the CS domain call control according to the CS domain the standard process to complete the call release entities, including CS (TM) and the CS call control circuit domain call release procedure in step between entities 51a, and the CS call control entity CS domain transfer a call release procedure between the MGCF / IM-MGW step 51b; step 52: MGCF released into the process IMS TM in the IMS domain callback; step 53: IMS TM notifies the originating side of the peer user to pause at this end of the original sending the media stream transmitted through the CS bearer; step 54: PS bearer is used to establish the appropriate corresponding media streams are transmitted, and notifies the peer to redirect the media stream is transmitted to the newly established PS bearer by the re-negotiation process 端口(原来传递到互通网关再由网关经CS承载传递到用户);步骤55:IMS TM通知对端用户恢复媒体流的发送。 Port (originally passing to the interworking gateway through the CS bearer by the gateway and then delivered to the user); Step 55: IMS TM notifies the peer user sends media stream recovery.

在实际应用中,特别是在IMS TM和CS TM分离情况下,存在IMS TM不支持3GPP要求的相关SIP扩展的情况,此时,MGCF采用E2E(端到端)方式完成3GPP SIP和non-3GPP SIP的流程协商;MGCF也可在IMS会话发起前通过SIP相关操作与相应的IMS终端间进行能力查询协商,并根据协商结果发起到IMS TM的会话建立过程;因此,本发明所述的方法还包括:当发起端IMS TM不支持3GPP要求的SIP协议扩展{如IETF RFC 3312所定义的Precondition(预置条件,综合资源管理和SIP),IETF RFC 3311所定义的UPDATE(更新)方法以及IETFRFC 3262所定义的100Rel(SIP临时响应的可靠传递)}时的处理过程,具体的处理过程如图6所示,包括以下步骤:步骤61:MGCF向控制发起CS承载建立的IMS TM发起IMS会话建立请求,请求中要求所述IMS TM支持SIP协议扩展(如Precondition等);步骤62:所述的IMS TM向MGCF返回会话建立失败消息,失败原因是被叫IMS TM In practical applications, especially in the IMS TM and the CS TM segregation, presence of relevant IMS TM does not support the SIP extension required by 3GPP, this time, the MGCF using the E2E (end to end) is accomplished 3GPP and non-3GPP SIP SIP negotiation process; the MGCF may also be performed between the SIP negotiation capability query associated with the respective operations before the IMS terminal an IMS session initiation, and initiates session establishment procedure to the IMS TM according to a negotiation result; therefore, the method of the present invention comprising: when the terminal initiates IMS TM does not support the SIP extension required by 3GPP uPDATE {such as Precondition (preset condition, integrated resource management and SIP) IETF RFC 3312 defined, IETF RFC 3311 defined (updating) method and IETFRFC 3262 100Rel defined (SIP provisional reliable response transmission) when the process}, the specific processing procedure shown in Figure 6, comprising the following steps: step 61: MGCF initiates IMS TM CS bearer establishment control to initiate an IMS session establishment request , the request requires the IMS TM support the SIP extension (e.g. Precondition, etc.); step 62: the IMS TM returns a session establishment failure message to the MGCF, is the reason for the failure of the called IMS TM 不支持SIP协议扩展;步骤63:MGCF重新向所述的IMS TM发起IMS会话建立请求,请求中不再要求其支持SIP协议扩展;步骤64:所述IMS TM向MGCF返回会话建立成功的消息;由于MGCF了解IMS TM不支持Precondition,无法在与MGCF的IMS会话建立过程中正确通知MGCF其本侧(实际上为对端用户侧)是否已经为媒体流的传递准备好了相关的承载资源,因此在步骤63和64中建立的会话将交互的媒体流描述为未激活状态,以避免任何一方提前发送无效媒体流;IMS TM在实际的与对端用户间的IMS会话中同样无法支持Precondition,因此: It does not support SIP protocol extension; Step 63 is: MGCF reinitiate the IMS TM to the IMS session establishment request, it is no longer required to support the SIP protocol extension; Step 64: the IMS TM returns a session establishment success message to the MGCF; Since MGCF understand IMS TM does not support Precondition, this can not properly notify its side MGCF MGCF in establishing the IMS session process (in fact, for the end user side) whether ready related bearer resource transfer media stream, so created in step 63 and 64 session interactive media streams is described as inactive, in order to avoid either send dummy media stream in advance; IMS (TM) in the actual and the same can not support Precondition for IMS sessions between end users, thus :

步骤65:对端用户在自己完成所需承载资源的准备后将通知IMS TM,IMS TM直接发起或将对端用户的通知转发给MGCF后由MGCF发起重协商过程,将媒体流描述修改为激活,从而正式开始传递。 Step 65: After preparing to end users in their own bearer resources needed to complete the notification IMS TM, IMS TM will be forwarded directly to initiate or end user is notified to the MGCF MGCF initiated by the re-negotiation process, the media flow description modified to activate , which officially began delivery.

上述步骤61到步骤65的处理过程也可以采用如下过程实现:(1)MGCF向被叫IMS TM发起IMS能力查询请求,以获知被IMS TM是否支持SIP协议扩展;(2)所述的被叫IMS TM向MGCF返回能力查询结果,结果是被叫IMSTM不支持SIP协议扩展(如Precondition);(3)MGCF向被叫IMS TM发起IMS会话建立请求,请求中不要求被叫IMS TM支持SIP协议扩展;(4)被叫IMS TM向MGCF返回会话建立成功的消息;步骤(3)、(4)所建立的会话将交互的媒体流描述为未激活状态,以避免任何一方提前发送无效媒体流;(5)对端用户在自己完成所需承载资源的准备后将通知IMS TM,IMSTM直接发起或将对端用户的通知转发给MGCF后由MGCF发起重协商过程,将媒体流描述修改为激活,从而正式开始传递。 The above-described step 61 to step 65 of the process may be achieved using the following procedure: (1) MGCF initiates an IMS capability inquiry request to the called IMS TM, in order to know whether the IMS TM supports the SIP extension; the called party (2) IMS TM returns the query result to the MGCF capacity, the result is called IMSTM SIP protocol extension is not supported (e.g. Precondition); (3) MGCF establishment request to the called IMS TM to initiate an IMS session, the request does not require the called IMS TM support the SIP protocol extended; (4) the called IMS TM MGCF returns a successful session establishment message; step (3), (4) the established interaction session media streams is described as inactive, either sent in advance to avoid the media stream is invalid ; after preparation (5) to the end user in their own bearer resources needed to complete notification of IMS TM, IMSTM initiated directly or forward end user will notify the MGCF initiates the re-negotiation process by the MGCF, the media stream will be described as modified activation , which officially began delivery.

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。 Above, the present invention is merely preferred specific embodiments, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought of the changes or Alternatively, it shall fall within the protection scope of the present invention. 因此,本发明的保护范围应该以权利要求书的保护范围为准。 Accordingly, the scope of the present invention, the scope of the claims should prevail.

Claims (29)

1.一种IP多媒体子系统中利用电路交换承载业务的系统,其特征在于,包括:IP多媒体子系统IMS终端模块:用于实现电路交换承载控制功能,在IP多媒体子系统业务中判断并控制CS终端模块发起CS承载的建立过程,并在后续收到CS域与IMS域互通网关转发的回呼后完成与CS域与IMS域互通网关及与对端用户间两段IP多媒体子系统会话间的关联控制;电路交换CS终端模块:作为电路交换承载建立的发起端,用于根据IMS终端模块的指令发起CS承载的建立请求,并与CS域呼叫控制实体进行相应的交互完成CS承载的建立过程;CS域呼叫控制实体:与CS终端模块交互建立CS承载,并将由IMS终端模块控制CS终端模块发起建立的CS承载建立的呼叫路由到CS域与IMS域互通网关上;CS域与IMS域互通网关:作为电路交换承载建立的终结端,完成CS域呼叫控制实体控制路由到本端的CS承载建 An IP multimedia subsystem using the circuit switched bearer service system, characterized by comprising: an IP Multimedia Subsystem, IMS, terminal module: for implementing a circuit switched bearer control function, an IP Multimedia Subsystem service determines and controls CS terminal module initiates the CS bearer establish procedure, and upon subsequent receipt of the CS domain and the IMS domain interworking gateway forwards the call back to complete the CS domain and the IMS domain and the interworking gateway between an end user of an IP multimedia subsystem session between two association control; the CS terminal module: initiating a circuit switched bearer establishment end, for initiating a request for establishing a CS bearer in the IMS terminal according to an instruction module, and the CS call control entity interactive corresponding CS bearer establishment complete process; CS domain call control entity: with the CS terminal module interaction establishing a CS bearer, and controlled by the IMS terminal module CS terminal module initiates the establishment of the CS bearer route the call establishment on the CS domain and the IMS domain interworking gateway; CS domain and the IMS domain interworking gateway: a circuit switched bearer establishment terminating end, the call control entity to complete the CS domain is routed to the control terminal CS bearer construction of the present 的呼叫到IP多媒体子系统会话的互通,并将会话控制信令经接续到控制发起该过程的IMS终端模块。 The call to the shared IP multimedia subsystem session, and the session control signaling via a control connection to the module terminal initiates an IMS procedure.
2.根据权利要求1所述的IP多媒体子系统中利用电路交换承载业务的系统,其特征在于,所述的IMS终端模块和CS终端模块集成于同一终端中,或,各自独立设置。 2. The system of claim 1 IP Multimedia Subsystem services using a circuit switched bearer claim, characterized in that said terminal module and a CS IMS terminal module is integrated in the same terminal, or provided independently.
3.根据权利要求2所述的IP多媒体子系统中利用电路交换承载业务的系统,其特征在于,当所述的IMS终端模块和CS终端模块各自分离设置时,采用短距离无线通信的方式连接互通,且所述的IMS终端采用的方式包括:主机PC或个人数字助理PDA。 3. The system of claim 2 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein, when said terminal CS and IMS terminal modules separated from each module is provided, by way of short-range wireless communication connection exchange, and the manner of using the IMS terminal comprises: a host PC or a personal digital assistant PDA.
4.根据权利要求1、2或3所述的IP多媒体子系统中利用电路交换承载业务的系统,其特征在于,所述的IMS终端模块和CS终端模块还对应设置有号码存储模块,用于存储分别为IMS终端模块和CS终端模块分配的电话号码;并且,当IMS终端模块和CS终端模块集成于同一终端中时,各自对应的号码存储模块设置为用于被对方直接访问。 Or 4. The system of claim 1,2 3 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein said module and the IMS terminal CS corresponding to the terminal module is also provided with a number storage module for IMS terminal modules are stored and a CS phone number assigned to the terminal module; and, when the CS terminal and the IMS terminal block module is integrated in the same terminal, each corresponding number storage module is provided for direct access to each other.
5.一种基于所述系统的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,包括:A、在IMS业务中采用CS承载的用户终端的IMS终端模块向CS终端模块发起CS承载建立请求;B、CS终端模块收到IMS终端模块的请求后,与CS域呼叫控制实体交互建立CS承载;C、CS域呼叫控制实体将建立CS承载的呼叫路由到CS域与IMS域互通网关处;D、CS域与IMS域互通网关将建立CS承载的CS域呼叫转化为IMS域会话并接续到控制发起CS承载建立的IMS终端模块;E、IMS终端模块收到CS域与IMS域互通网关转发的CS承载建立的IMS回呼后,完成与CS域与IMS域互通网关及与对端用户间两段IP多媒体子系统会话间的关联控制,令对端用户将其与本端用户间IP多媒体子系统会话中交互的媒体流传递到CS域与IMS域互通网关上,利用CS域与IMS域互通网关与CS终端模块间建立的CS承载传送到本端用户。 A method for using an IP Multimedia Subsystem of the circuit system based on the exchange bearer traffic, characterized by comprising: A, IMS terminal module using the user terminal CS bearer in the IMS service initiates a CS to the CS terminal block bearer setup request; B, after receiving the request the terminal module CS IMS terminal module, the CS domain call control entity interactive establish the CS bearer; C, the CS domain call control entity routing the call will be established CS bearer and the IMS domain to the CS domain interworking gateway; D, CS domain and the IMS domain interworking gateway to establish a CS call for the conversion of CS bearer and IMS domain session connection to the terminal control module initiates an IMS CS bearer establishment; E, IMS terminal module receives the CS domain and the IMS domain forwarding interworking gateway after establishing the CS bearer IMS call-back, to complete the CS domain and the IMS domain and the interworking gateway for the association between an IP multimedia subsystem session between two end user control, so that the end user of the end user to which the present IP multimedia subsystem session between the interactive media stream to the CS domain and the IMS domain interworking gateway, the CS domain and the interworking gateway between the CS and the CS terminal modules establish an IMS domain to the local user bearer transfers.
6.根据权利要求5所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:分别为IMS终端模块和CS终端模块分配电话号码并保存,所述的为IMS终端模块分配的号码为属于其签约的网络,所述的为CS终端模块分配的电话号码为其在CS签约的国际移动台ISDN号码MSISDN。 The circuit switched bearer service method of claim 5 using an IP Multimedia Subsystem, characterized in that, the method further including the claims: IMS terminal module and the terminal module CS and saved telephone number is allocated respectively, of the number assigned to the IMS terminal module within its subscription network, the telephone number is allocated to the CS terminal module for its international mobile station ISDN number MSISDN of the CS subscription.
7.根据权利要求6所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的为IMS终端模块分配的电话号码包括:区域识别前缀和/或业务类型前缀。 The method of using the circuit switched bearer service in 6 IP Multimedia Subsystem as claimed in claim, wherein the telephone number assigned to an IMS terminal module comprising: a region identification prefix and / or service type prefix.
8.根据权利要求5所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,执行所述的步骤A之前还包括:IMS终端模块判断IMS业务中需要交互的是否包含有需要通过CS承载传输的媒体流,如果有,则执行步骤A,否则,不执行步骤A。 8. The method of using a circuit switched bearer traffic IP multimedia subsystem 5 according to the preceding claims, wherein before performing the step A further comprises: a terminal module determines that IMS IMS service interaction is required is included in the necessary transmitted through the CS bearer media stream, if so, step a, otherwise, does not execute step A.
9.根据权利要求8所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的IMS终端模块在准备发起IMS会话、接到IMS会话请求或者在已经建立的IMS会话中准备发起重协商或接到对端的重协商请求时,进行是否包含有需要通过CS承载传输的媒体流的判断。 9. A method of using a circuit switched bearer service according to 8 IP Multimedia Subsystem according to claim, wherein said module is ready to start the IMS terminal an IMS session, an IMS session request or the received IMS session has been established re-negotiation initiated or prepared for receiving an end request when the renegotiation, by determining the need for transmission of the media stream CS bearer is included there.
10.根据权利要求6所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,当IMS终端模块与CS终端模块各自独立设置时,则执行所述的步骤A之前还包括:IMS终端模块获取CS终端模块的MSISDN号码信息,所述的获取过程是在IMS终端模块每次发起CS承载建立请求之前完成,或在IMS终端模块和CS终端模块启动时一次性完成。 10. The method of using the circuit switched bearer service in 6 IP Multimedia Subsystem as claimed in claim, wherein, when the CS terminal and the IMS terminal block module is independently provided, is performed prior to said step A further comprises: IMS CS terminal module obtaining information of a terminal module MSISDN number, the acquisition process is initiated by the IMS terminal modules each CS bearer setup request prior to completion, or at the completion of the disposable module and the IMS terminal CS terminal module startup.
11.根据权利要求5所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,步骤A所述的CS承载建立请求中包括:所述IMS终端模块的承载能力指示信息;并且当CS终端模块不能直接访问IMS终端模块的号码存储模块时,所述的CS承载建立请求中还包括为该IMS终端模块分配的电话号码;所述的CS承载建立请求中还可选地包括:所述IMS终端的初始会话协议统一资源定位符地址信息。 11. A method of using a circuit switched bearer service 5 in the IP Multimedia Subsystem according to claim, wherein said step A a CS bearer setup request comprising: the bearer capability indication information module IMS terminal; and when the CS terminal module can not directly access number storage module of the IMS terminal module, the CS bearer establishment request further includes a dispensing module for an IMS terminal telephone number; the CS bearer establishment request further optionally comprising: the session initiation protocol uniform resource locator address information of the IMS terminal.
12.根据权利要求5、6或11所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤B包括:CS终端模块向CS域呼叫控制实体发起CS承载建立请求,所述的请求中包括被叫号码信息和承载能力指示,并可选地包括通过用户到用户信令携带IMS初始会话协议统一资源定位符地址;其中,所述的被叫号码信息为为所述IMS终端模块分配的电话号码,所述的承载能力指示为该IMS终端模块要求的承载能力。 12. The method of claim 5, 6 or 11, an IP Multimedia Subsystem services using a circuit switched bearer claim, wherein said step B comprises: CS terminal module CS call control entity to initiate a CS bearer establishment request, the request includes a called number information and bearer capability indication, and optionally including an IMS session initiation protocol uniform resource locator address by a user signaling to the user; wherein the called number information to the telephone number of the IMS terminal module allocation, the bearer capability indication for the IMS terminal module carrying capacity requirements.
13.根据权利要求12所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息确定将建立的CS承载配置为路由到CS域与IMS域互通网关处。 13. A method of using a circuit switched bearer service 12 according to an IP Multimedia Subsystem according to claim, wherein said step C comprising: CS domain call control entity to establish request according to the called number to the CS bearer the information for determining the established CS bearer configured to route to the CS domain and the IMS domain interworking gateway.
14.根据权利要求13所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息中区域识别前缀或业务类型前缀确定将建立的CS承载配置为路由到用户归属区域或最近的CS域与IMS域互通网关处。 14. A method of using a circuit switched bearer service the 13 IP Multimedia Subsystem according to claim, wherein said step C comprising: CS domain call control entity to establish request according to the called number to the CS bearer area identification prefix in the prefix information or a service type is determined to be established CS bearer configured to route the subscriber's home area or to the nearest CS domain and the IMS domain interworking gateway.
15.根据权利要求13所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤C包括:CS域呼叫控制实体根据所述CS承载建立请求中的被叫号码信息中业务类型前缀进行配置,禁止在CS域签约的主叫用户侧的补充业务对建立用于IMS业务中部分媒体流传递的CS承载的呼叫产生影响。 15. A method of using a circuit switched bearer service the 13 IP Multimedia Subsystem according to claim, wherein said step C comprising: CS domain call control entity to establish request according to the called number to the CS bearer information service type prefix configured to not supplementary services subscribed in the CS domain calling user side impact on the part of the media stream for establishing a call transfer service in the IMS CS bearer.
16.根据权利要求12所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤D包括:CS域与IMS域互通网关获得控制发起CS承载建立的IMS终端模块的IMS域公有标识,并根据所述IMS域公有标识将建立CS承载的CS域呼叫转化为IMS域会话并按照IMS域会话处理流程接续到控制发起CS承载建立的IMS终端模块;并按照承载能力指示为接收被叫侧IMS域交互媒体流预留端口资源。 16. A method of using a circuit switched bearer service 12 according to an IP Multimedia Subsystem according to claim, wherein said step D comprising: CS domain and the IMS domain initiates an IMS interworking gateway to obtain the control terminal CS bearer establishment module the public identity IMS domain, and an IMS domain according to the public user identity will be established CS call into a CS bearer and the IMS domain according to an IMS domain session session process flow continues into the control module initiates an IMS terminal CS bearer establishment; carrying capacity and in accordance with to receive an indication of a called-side IMS domain interaction media stream port reserved resources.
17.根据权利要求16所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤D还包括:CS域与IMS域互通网关发往发起建立CS承载的IMS终端模块的IMS会话建立请求消息中携带有对应的CS终端模块MSISDN号码以及对会话中交互媒体流的会话描述协议指示,该会话描述协议指示中包含了CS域与IMS域互通网关上为接收被叫侧IMS域交互媒体流预留的IP地址和UDP端口信息。 17. A method of using a circuit switched bearer service the 16 IP Multimedia Subsystem according to claim, wherein said step D further comprises: CS domain and the IMS domain interworking gateway sent to the terminal initiates a IMS CS bearer module IMS session establishment request message carries the terminal CS corresponding to the MSISDN number and module of the session description protocol session indicated interactive media streams, the session description protocol designation contains the CS domain and the IMS domain interworking gateway to receive a called side IMS domain interaction media stream IP address and UDP port information reserved.
18.根据权利要求16所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤D还包括:CS域与IMS域互通网关通过根据呼叫建立请求中被叫号码填写的IMS终端模块电话号码查询电话号码映射服务器得到IMS终端模块的IMS域公有标识;或者,CS域与IMS域互通网关通过CS域呼叫建立请求中用户到用户信令中传递的内容直接得到IMS终端模块的IMS域公有标识。 18. A method of using a circuit switched bearer service the 16 IP Multimedia Subsystem according to claim, wherein said step D further comprises: CS domain and the IMS domain interworking gateway establishment request according to the called number by the call fill the IMS terminal telephone number query module ENUM server to obtain the IMS domain public identifier of the IMS terminal module; or, CS domain and the IMS domain interworking gateway through the CS domain call establishment request the user to user signaling content delivery directly IMS terminal domain IMS public identity module.
19.根据权利要求16所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,执行所述的步骤D之前还包括:所述的CS域与IMS域互通网关根据是否配置该IMS终端模块的电话号码转换数据确定该用户是否有权在IMS会话中使用CS承载业务,如果配置所述转换数据,则有权使用。 19. A method of using a circuit switched bearer service the 16 IP Multimedia Subsystem according to claim, characterized in that, prior to performing said step D further comprises: the CS domain and the IMS domain interworking gateway is configured in accordance with the converting the telephone number data IMS terminal module determines whether the user is authorized to use a CS bearer in the IMS service session, if the configuration data conversion, the right to use.
20.根据权利要求16所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤D包括:CS域与IMS域互通网关发往发起CS承载建立的IMS终端模块的IMS会话建立请求消息中携带的会话描述协议指示中包含了专用指示信息,IMS域代理呼叫与会话控制功能实体根据所述的专用指示信息识别经由CS承载的媒体流并在资源预留上进行相应处理;所述的专用指示信息采用的实现方式包括:对会话描述协议SDP进行扩展定义。 20. The method of claim 16 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein said step D comprising: CS domain and the IMS domain initiates an IMS interworking gateway addressed to terminal module CS bearer establishment IMS session establishment request message carries an indication of the session description protocol contains specific instructions, IMS domain and a proxy call session control function entity via a CS bearer information for identifying a media stream and carried in the resource reservation according to the specific indication corresponding processing; implementations using the dedicated instruction information includes: the session description protocol SDP extended definition.
21.根据权利要求5或6所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤E包括IMS终端模块判断确定所接到的IMS会话建立请求消息为其先前的CS承载建立请求过程的IMS回呼,以背靠背用户代理B2BUA模式关联处理与对端用户及与CS域与IMS域互通网关间的两段IMS域会话建立过程:IMS终端模块利用CS承载建立IMS回呼的会话建立请求消息中提供的会话描述协议指示作为其对应的IMS会话中申请采用CS承载的媒体流的本侧描述指示,处理与对端用户间的IMS域会话建立过程;IMS终端模块利用与对端用户间IMS会话建立过程中得到的关于其申请采用CS承载的媒体流的对端的会话描述协议指示,作为本侧描述指示,处理与CS域与IMS域互通网关间的IMS域会话建立过程。 21. The method of using a circuit switched bearer service 5 or 6 IP Multimedia Subsystem as claimed in claim, wherein said step E comprises an IMS terminal determining module determines to an IMS session establishment request message for IMS previous CS bearer establish procedure requested callback to-back user agent B2BUA mode associated with the peer user and the processing process of establishing a session between two IMS domain and the IMS domain to the CS domain interworking gateway: IMS terminal modules establish the CS bearer IMS call-back session establishment request session description protocol message provided instructions to apply as the corresponding IMS session in the present side description indicates CS bearer media stream, the process and the establishment process of IMS domain session between the end user; IMS terminal module uses and an IMS session establishment SDP indication of the application using the media stream CS bearer peer obtained during the inter-end user, as this side description indicates, the IMS domain between the process and the CS domain and the IMS domain interworking gateway session establishment process.
22.根据权利要求21所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,所述的步骤E还包括:IMS终端模块接到CS域与IMS域互通网关的IMS会话建立请求后,根据消息中携带的对应的CS终端模块的MSISDN号码确定该IMS会话建立请求是其先前的CS承载建立请求过程对应的IMS回呼。 22. The method of claim 21 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein said step E further comprises: a terminal module IMS CS domain to an IMS session with the IMS domain interworking gateway to establish after the request, determining that the IMS session establishment request is the previous CS bearer establishment request procedure according to the corresponding IMS call-back message carries the MSISDN number of the terminal CS corresponding module.
23.根据权利要求5或6所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:CS域的计费系统根据CS终端模块发起的CS域呼叫中主被叫号码的关联关系确定该次呼叫为IP多媒体子系统会话中使用的CS承载建立导致的呼叫,并进行与IMS会话关联的计费批价处理。 23. The method of claim 5 or 6 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein the method further comprises: CS domain charging system according to the CS originating CS call terminal main module determining association relationship of the called number for the call is an IP multimedia subsystem session establish a call using the CS bearer result, the charging and rating processes associated with IMS session.
24.根据权利要求5或6所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:当控制发起CS承载建立的IMS终端模块不支持3GPP要求的部分初始会话协议扩展时,所述的CS域与IMS域互通网关还需要支持通过与该IMS终端模块间端到端流程协商过程完成IMS域回呼的建立。 24. The method of claim 5 or 6 IP Multimedia Subsystem services using a circuit switched bearer claim, wherein the method further comprises: an initial part of the establishment of the CS bearer IMS terminal module does not support the requested 3GPP initiated when the control when the session protocol extension, the CS domain and IMS domain interworking gateway also need to support the establishment of the IMS domain to complete the call back through the process and end the consultation process between the IMS terminal module.
25.根据权利要求24所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:当控制发起CS承载建立的IMS终端模块不支持3GPP要求的部分初始会话协议扩展时,所述的CS域与IMS域互通网关与该IMS终端模块间端到端流程过程采用预先查询对端能力方式实现,或者,采用收到不支持所要求的扩展的失败指示后重新发起不要求该扩展的会话建立请求方式实现。 25. A method of using a circuit switched bearer service the 24 IP Multimedia Subsystem according to claim, characterized in that the method further comprises: when the control module initiates the CS bearer establish IMS terminal unsupported portion of the requested session initiation protocol 3GPP after the extended re-initiate the CS domain and the IMS domain interworking gateway between the IMS and use terminal-end process module processes the query pre-peer capability manner, or using an extended failure indication received does not support the required It does not require the extended session establishment request ways.
26.根据权利要求5所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:在与对端IMS终端间的呼叫过程结束时,则由控制发起CS承载建立的IMS终端模块指示CS终端模块发起释放CS终端模块和CS域与IMS域互通网关间的CS承载,以及CS域与IMS域互通网关与控制发起CS承载建立的IMS终端模块间的IMS连接。 26. The method of claim 5 in an IP Multimedia Subsystem services using a circuit switched bearer claim, wherein the method further comprises: when the call procedure between an IMS terminal end of the end, to initiate the CS bearer by the control IMS terminal modules establish an indication of CS terminal module initiates the release of the CS bearer between the CS terminal module and the CS domain and the IMS domain interworking gateway, and the CS domain and the IMS domain interworking gateway control initiates an IMS connection between the IMS terminal module CS bearer establishment.
27.根据权利要求5所述的IP多媒体子系统中利用电路交换承载业务的方法,其特征在于,该方法还包括:当CS域呼叫控制实体和CS域与IMS域互通网关为同一实体时,执行所述的步骤B后,直接执行所述的步骤D。 27. A method of using a circuit switched bearer service 5 in the IP Multimedia Subsystem according to claim, characterized in that, the method further comprising: when the CS domain call control entity and the CS domain interworking gateway and the IMS domain for the same entity, after performing the step B, and the direct execution of step D.
28.一种CS终端模块与互通网关间CS承载异常时的处理方法,其特征在于,包括:F、CS终端模块和CS域呼叫控制实体间互通释放出现异常的CS承载;G、CS域呼叫控制实体和CS域与IMS域互通网关间互通释放转接呼叫;H、CS域与IMS域互通网关释放与控制发起CS承载建立的IMS终端模块间的IMS会话连接;I、在控制发起CS承载建立的IMS终端模块上利用重协商过程重新建立分组交换PS承载进行原来利用CS承载的那部分媒体流的传输。 28. A terminal module between CS and CS interworking gateway bearer processing method when an abnormality, characterized by comprising: F, CS terminal module and the CS domain call control entity interworking between abnormal release CS bearer; G, CS call interworking between the call control entity and the transfer release the CS domain and the IMS domain interworking gateway; H, CS domain and the IMS domain interworking gateway releases the IMS control initiates an IMS session between the terminal connection module to establish the CS bearer; I, initiates a CS bearer control re-establishing a packet switched PS bearer portion of the original transmission using the CS bearer media stream using the re-negotiation on the IMS terminal during the establishment of the module.
29.根据权利要求28所述的CS终端模块与互通网关间CS承载异常时的处理方法,其特征在于,所述的步骤I包括:通知对端IMS用户停止相应部分媒体流的发送;在会话内发起更改交互媒体流的请求,完成相应的PS承载资源的申请和建立,并通过通知对端将媒体流改向将原来利用CS承载传递的媒体流改由PS承载传递;在所述PS承载建立完成后,通知对端用户恢复相应部分媒体流的发送。 29. The processing method when a terminal module and between the CS interworking gateway according to claim 28 CS bearer abnormality, wherein said step I comprises: a notification to an IMS user terminal to stop sending the corresponding part of the media stream; session initiating the request to change an interactive media streams, complete the appropriate application of resources and the PS bearer establishment, and by informing the end of the media stream redirected to the original transmission using the CS bearer media stream transmission bearer replaced by PS; PS bearer in the Once created, the user resumes sending the notification to a respective end portion of the media stream.
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