基于IMS的多媒体会议关键技术的研究与设计
摘要
IMS(IP Multimedia Subsystem)是3GPP(The Third GenerationPartnership Project)在Release 5版本提出的支持IP多媒体业务的子系统,核心是采用SIP(Session Initiation Protocol)协议进行控制,实现端到端的多媒体通信。IMS与接入无关,可以提供固定与移动融合的多媒体业务,被当前业界公认为未来融合的控制平台。
随着互联网宽带用户和移动高端用户的快速增长,同时对于效率极低的传统电话会议的日益不满,市场对集成了多方视频、音频会议和数据协作功能为代表的多媒体会议业务产生了旺盛的需求。用户期望可以通过可视电话、安装在电脑上的视频、Web浏览器或者手机、普通电话等终端,方便地和朋友、同事进行实时多方视频、音频、数据通信。对于企业而言,通过视频、音频和即时通信功能的集成,将会大大提高员工之间、和客户之间的沟通效率,会议从此将成为精确、可控的高效交流方式。面对这种情形,传统网络架构下的现有会议已经不能满足越来越多的此类需求,而IMS作为一种可以融合多媒体业务的网络架构,越来越受到运营商、业务提供厂商和开发厂商的关注,并在通信行业的新业务试点中体现出了其融合的优势。因此,在IMS标准开放的业务体系架构下研究开发多媒体会议业务成为业界日趋认同的解决方案。
论文的组织结构安排如下:首先在第一章介绍了IMS网络的背景、体系结构及业务提供架构,并简要介绍了多媒体会议业务和目前国际标准组织3GPP、IETF(The Internet Engineering Task Force)对多媒体会议业务的研究现状,并阐述了当前多媒体会议业务的H.323实现机制,包括基于H.323协议的多媒体会议架构、基本通信控制过程和会议控制机制,指出这种实现方式的不足之处。第二章从架构技术方面对多媒体会议业务进行了研究和设计,基于目前各技术标准组织及市场对多媒体会议业务的功能需求,在IETF提出的框架模型的基础上,提出了可以充分发挥IMS网络业务融合优势的组合多媒体会议业务架构,并详细设计其内部模块功能实现、业务场景和业务流程。第三章从多媒体会议控制技术入手,研究设计了基于SIP协议的多媒体会议控制机制,提出了按照控制角色区分控制权限的用户控制机制、按照媒体类型进行分类控制的媒体控制机制和融合多媒体会议业务进行控制的会场控制机制,着重研究了根据XMPP(ExtensibleMessaging& Presence Protocol)协议设计的适合数据类业务(如电子白板、应用共享等业务)控制的基于SIP+TCP(XML)的媒体控制协议。第四章则针对IMS网络下具体的多媒体应用服务器的功能实现需求,研究了可以迅速开发部署业务的基于开放标准JAIN SLEE的架构和组件模型,并根据其事件分发模型设计了实现多媒体会议业务的关键会场控制逻辑、事件控制模块和业务逻辑部署,总结了采用JAINSLEE架构实现业务的优势。最后基于上述几章的研究和设计,指出了在IMS网络下研究和设计多媒体会议业务时所涉及到的关键技术问题,并提出了对未来多媒体会议业务前景的展望。
IP Multimedia Subsystem is a subsystem introduced by 3GPP in its Release 5 version of the future network architecture to provide support of IP multimedia services. Its core thesis is to use SIP (Session Initiation Protocol) to control the sessions to implement the end to end multi-media communication. IMS has no relationship with access method, and can provide Fixed-Mobile Convergent service. So, IMS is regarded as the convergent control platform in the future industry.
As the rapid grow of the customers who use Internet and high-level Mobile terminals, the unsatisfaction for the inefficient traditional telephone conference has risen. And the requirement for the integrated multi-party video, audio and data conference has brought up. The users expect that they can have real-time multi-party communication integrated with audio, video and data media with their collegues or friends by the video phone, video setup on computer, WEB browser, mobile phone and common terminal. And for enterprises, they can deeply improve the communication efficiency within employees or with their customers by the integration of audio, video and data media. And conference will become an exact and efficient communication tool. In face of these requirements, the traditional network architecture has not satisfied this requirement. IMS which is regarded as a convergent multi-media architecture and performs large advantages in the new communication service trial, attracts more and more attention from the operator, service providers and service developers. So to research and develop multi-media conference service in standard and open IMS architect has become the excellent solution these days.
The article is organized like this: in the exordium of the first chapter, we firstly introduce the background, features and main functionalities of IMS, along with the present research status for multi-media conference service of international standard organization such as 3GPP and IETF. Then we explain the present multi-media conference implementation based on H.323 including the architecture, basic communication control and conference control mechinicsm and provide the disadvantage. The second chapter researches the architecture of the conference service. Then we research the requirement from the standard organization and the market, provide a convergent service architecture which can utilize the advantage of IMS network base on the IETF framework, and design the intenal functional modules and service scenario flow in particular. In the third chapter, we research and design the media control principle, user control principle, and conference control principle based on SIP Protocol. Also we provide the contrl role based user control mechniscm, media type based media control mechniscm and convergent service control mechniscm. And we emphasize on explaining the SIP with TCP(XML) media control protocol fit for the data service such as white board, application share service based on the XMPP protocol. The fourth chapter researches the JAIN SLEE architecture and component module which can rapidly develop and deploy service, then design and realize the key conference control service, event control module and service deployment of the multi-media conference in this open event-module technology standard. At last, we summarize the key technology in the research and design multi-media conferece based on IMS network, and provide the outlook of the future multi-media conference.
随着互联网宽带用户和移动高端用户的快速增长,同时对于效率极低的传统电话会议的日益不满,市场对集成了多方视频、音频会议和数据协作功能为代表的多媒体会议业务产生了旺盛的需求。用户期望可以通过可视电话、安装在电脑上的视频、Web浏览器或者手机、普通电话等终端,方便地和朋友、同事进行实时多方视频、音频、数据通信。对于企业而言,通过视频、音频和即时通信功能的集成,将会大大提高员工之间、和客户之间的沟通效率,会议从此将成为精确、可控的高效交流方式。面对这种情形,传统网络架构下的现有会议已经不能满足越来越多的此类需求,而IMS作为一种可以融合多媒体业务的网络架构,越来越受到运营商、业务提供厂商和开发厂商的关注,并在通信行业的新业务试点中体现出了其融合的优势。因此,在IMS标准开放的业务体系架构下研究开发多媒体会议业务成为业界日趋认同的解决方案。
论文的组织结构安排如下:首先在第一章介绍了IMS网络的背景、体系结构及业务提供架构,并简要介绍了多媒体会议业务和目前国际标准组织3GPP、IETF(The Internet Engineering Task Force)对多媒体会议业务的研究现状,并阐述了当前多媒体会议业务的H.323实现机制,包括基于H.323协议的多媒体会议架构、基本通信控制过程和会议控制机制,指出这种实现方式的不足之处。第二章从架构技术方面对多媒体会议业务进行了研究和设计,基于目前各技术标准组织及市场对多媒体会议业务的功能需求,在IETF提出的框架模型的基础上,提出了可以充分发挥IMS网络业务融合优势的组合多媒体会议业务架构,并详细设计其内部模块功能实现、业务场景和业务流程。第三章从多媒体会议控制技术入手,研究设计了基于SIP协议的多媒体会议控制机制,提出了按照控制角色区分控制权限的用户控制机制、按照媒体类型进行分类控制的媒体控制机制和融合多媒体会议业务进行控制的会场控制机制,着重研究了根据XMPP(ExtensibleMessaging& Presence Protocol)协议设计的适合数据类业务(如电子白板、应用共享等业务)控制的基于SIP+TCP(XML)的媒体控制协议。第四章则针对IMS网络下具体的多媒体应用服务器的功能实现需求,研究了可以迅速开发部署业务的基于开放标准JAIN SLEE的架构和组件模型,并根据其事件分发模型设计了实现多媒体会议业务的关键会场控制逻辑、事件控制模块和业务逻辑部署,总结了采用JAINSLEE架构实现业务的优势。最后基于上述几章的研究和设计,指出了在IMS网络下研究和设计多媒体会议业务时所涉及到的关键技术问题,并提出了对未来多媒体会议业务前景的展望。
IP Multimedia Subsystem is a subsystem introduced by 3GPP in its Release 5 version of the future network architecture to provide support of IP multimedia services. Its core thesis is to use SIP (Session Initiation Protocol) to control the sessions to implement the end to end multi-media communication. IMS has no relationship with access method, and can provide Fixed-Mobile Convergent service. So, IMS is regarded as the convergent control platform in the future industry.
As the rapid grow of the customers who use Internet and high-level Mobile terminals, the unsatisfaction for the inefficient traditional telephone conference has risen. And the requirement for the integrated multi-party video, audio and data conference has brought up. The users expect that they can have real-time multi-party communication integrated with audio, video and data media with their collegues or friends by the video phone, video setup on computer, WEB browser, mobile phone and common terminal. And for enterprises, they can deeply improve the communication efficiency within employees or with their customers by the integration of audio, video and data media. And conference will become an exact and efficient communication tool. In face of these requirements, the traditional network architecture has not satisfied this requirement. IMS which is regarded as a convergent multi-media architecture and performs large advantages in the new communication service trial, attracts more and more attention from the operator, service providers and service developers. So to research and develop multi-media conference service in standard and open IMS architect has become the excellent solution these days.
The article is organized like this: in the exordium of the first chapter, we firstly introduce the background, features and main functionalities of IMS, along with the present research status for multi-media conference service of international standard organization such as 3GPP and IETF. Then we explain the present multi-media conference implementation based on H.323 including the architecture, basic communication control and conference control mechinicsm and provide the disadvantage. The second chapter researches the architecture of the conference service. Then we research the requirement from the standard organization and the market, provide a convergent service architecture which can utilize the advantage of IMS network base on the IETF framework, and design the intenal functional modules and service scenario flow in particular. In the third chapter, we research and design the media control principle, user control principle, and conference control principle based on SIP Protocol. Also we provide the contrl role based user control mechniscm, media type based media control mechniscm and convergent service control mechniscm. And we emphasize on explaining the SIP with TCP(XML) media control protocol fit for the data service such as white board, application share service based on the XMPP protocol. The fourth chapter researches the JAIN SLEE architecture and component module which can rapidly develop and deploy service, then design and realize the key conference control service, event control module and service deployment of the multi-media conference in this open event-module technology standard. At last, we summarize the key technology in the research and design multi-media conferece based on IMS network, and provide the outlook of the future multi-media conference.
引文
[1]3GPP TS 23.228 V8.3.0(2007-12):"IP Multimedia Subsystem(IMS);Stage 2"
[2]Jonatlian Rosenberg,"Conferencing Framework with SIP",Internet RFC 4353,Febrary 2006
[3]Mary Barnes,Chris Boulton,Orit Levin."A Framework and Data Model for Centralized Conferencing",draft-ietf-xcon-framework-03,Mar 2006
[4]Jonathan Rosenberg,Henning Schulzrinne,OritLevin,"A Session Initiation Protocol(SIP)Event Package for Conference State",draft-ietf-sipping-conference-package-12,July 2005
[5]3GPP TS 24.229 V7.4.0(2006-06):"Internet Protocol(IP)multimedia call control protocol based on Session Initiation Protocol-(SIP)and Session Description Protocol(SDP);Stage 3".
[6]3GPP TS 23.218 V7.2.0(2006-03),"IP Multimedia(IM)session handling;IM call model;Stage 2".
[7]O.Levin,R.Even,"High-Level Requirements for Tightly Coupled SIP Conferencing ",rfc4245,Nov 2005
[8]J.Rosenberg,"A Framework for Conferencing with the Session Initiation Protocol(SIP)",rfc4353,Feb 2006
[9]RoniEven,NermeenIsmail,"ConferencingScenarios",draft-ietf-xcon-conference-scenarios-05,September 2005
[10]ITU-T Recommendation(2006-06),"H.323 Packet-based multimedia communications systems"
[11]ITU-T Recommendation(2006-05),"H.245 Control protocol for multimedia communication"
[12]ITU-T Recommendation(2006-05),"H.225 Call signalling protocols and media stream packetization for packet-based multimedia communication systems"
[13]Gonzalo Camarillo,Alan Johnston,"Conference Establishment Using Request-Contained Lists in the Session Initiation Protocol(SIP)",draft-ietf-sipping-uri-list-conferencing-05,February 2006
[14]3GPP TS 24.247 V6.5.0(2006-03):"Messaging service using the IP Multimedia(IM)Core Network"
[15]3GPP TS 22.250 V6.0.0(2002-12):"IP Multimedia Subsystem(IMS)group management;Stage 1"
[16]http://www.ibm.com/developerworks/cn/opensource/os-jain-slee
[17]http://java.sun.com/products/jain/article_slee_principles.html
[18]3GPP TS 24.147:Conferencing using the IP Multimedia Core Network(CN)subsystem
[19]中国移动通信集团公司,中国移动IMS多媒体业务技术方案,V1.0.0
[20]JAIN.JAIN SLEE v1.0 specification,Final Release Jan.2004
[21]http://java.sun.com/products/jain/JAIN-SLEE-Tutodal.pdf
[22]Sun Microsystems,JAVA Advanced Intelligent Network,the JAIN API's,http://java.sun.com/products/j ain/api_specs.html
[2]Jonatlian Rosenberg,"Conferencing Framework with SIP",Internet RFC 4353,Febrary 2006
[3]Mary Barnes,Chris Boulton,Orit Levin."A Framework and Data Model for Centralized Conferencing",draft-ietf-xcon-framework-03,Mar 2006
[4]Jonathan Rosenberg,Henning Schulzrinne,OritLevin,"A Session Initiation Protocol(SIP)Event Package for Conference State",draft-ietf-sipping-conference-package-12,July 2005
[5]3GPP TS 24.229 V7.4.0(2006-06):"Internet Protocol(IP)multimedia call control protocol based on Session Initiation Protocol-(SIP)and Session Description Protocol(SDP);Stage 3".
[6]3GPP TS 23.218 V7.2.0(2006-03),"IP Multimedia(IM)session handling;IM call model;Stage 2".
[7]O.Levin,R.Even,"High-Level Requirements for Tightly Coupled SIP Conferencing ",rfc4245,Nov 2005
[8]J.Rosenberg,"A Framework for Conferencing with the Session Initiation Protocol(SIP)",rfc4353,Feb 2006
[9]RoniEven,NermeenIsmail,"ConferencingScenarios",draft-ietf-xcon-conference-scenarios-05,September 2005
[10]ITU-T Recommendation(2006-06),"H.323 Packet-based multimedia communications systems"
[11]ITU-T Recommendation(2006-05),"H.245 Control protocol for multimedia communication"
[12]ITU-T Recommendation(2006-05),"H.225 Call signalling protocols and media stream packetization for packet-based multimedia communication systems"
[13]Gonzalo Camarillo,Alan Johnston,"Conference Establishment Using Request-Contained Lists in the Session Initiation Protocol(SIP)",draft-ietf-sipping-uri-list-conferencing-05,February 2006
[14]3GPP TS 24.247 V6.5.0(2006-03):"Messaging service using the IP Multimedia(IM)Core Network"
[15]3GPP TS 22.250 V6.0.0(2002-12):"IP Multimedia Subsystem(IMS)group management;Stage 1"
[16]http://www.ibm.com/developerworks/cn/opensource/os-jain-slee
[17]http://java.sun.com/products/jain/article_slee_principles.html
[18]3GPP TS 24.147:Conferencing using the IP Multimedia Core Network(CN)subsystem
[19]中国移动通信集团公司,中国移动IMS多媒体业务技术方案,V1.0.0
[20]JAIN.JAIN SLEE v1.0 specification,Final Release Jan.2004
[21]http://java.sun.com/products/jain/JAIN-SLEE-Tutodal.pdf
[22]Sun Microsystems,JAVA Advanced Intelligent Network,the JAIN API's,http://java.sun.com/products/j ain/api_specs.html