WebRTC系统与IMS互通网关的设计与实现

发布时间：2019-04-19 04:51

【摘要】：WebRTC (Web Real-Time Communications)是一种基于浏览器的实时音视频通信技术,不依赖于第三方插件,遵循相同WebRTC的规范标准的浏览器之间亦可以实现跨平台、跨浏览器的多媒体通信。WebRTC技术的出现对传统运营商的IMS多媒体实时通信业务形成挑战,各大运营商和设备制造商力争将WebRTC技术和IMS业务相结合,为传统多媒体业务寻求新的发展方向。本文针对WebRTC系统和IMS系统的信令和媒体互通进行了研究,并提出互通网关的实现方案。首先,本文在对WebRTC和IMS相关协议规范研究的基础上,分析了互通网关在WebRTC系统中的功能和位置,着重对互通网关如何实现WebRTC终端和IMS终端实现点对点的音视频通信进行了研究,从信令和媒体层面对互通网关进行设计,在支持WebRTC系统的ROAP信令到IMS系统SIP信令的协商转换的同时,要实现两个系统的媒体通道的互通,实现媒体会话的协商和编码转换的功能。基于此研究,本文详细介绍了呼叫业务流程和互通网关各模块的功能划分,设计了呼叫模块的状态机,根据设计确立了互通网关的实现方案:互通网关可分为信令网关和媒体服务器,信令网关负责信令会话协商,媒体服务器与通信双方建立媒体P2P直连,负责媒体流的中继转发,最后对此实现方案进行功能和性能测试,验证系统的可靠性和可用性。
[Abstract]:WebRTC (Web Real-Time Communications) is a browser-based real-time audio and video communication technology that does not rely on third-party plug-ins. Browsers that follow the same WebRTC specifications can also be cross-platform. Cross-browser multimedia communication. The emergence of WebRTC technology challenges the IMS multimedia real-time communication services of traditional operators. The major operators and equipment manufacturers strive to combine WebRTC technology with IMS services. For the traditional multimedia business to seek a new direction of development. In this paper, the signaling and media interworking between WebRTC system and IMS system is studied, and the implementation scheme of interworking gateway is put forward. Firstly, based on the research of WebRTC and IMS protocol specification, this paper analyzes the function and position of interworking gateway in WebRTC system, and focuses on how to realize point-to-point audio and video communication between WebRTC terminal and IMS terminal, and puts emphasis on the research on how to realize point-to-point audio and video communication between WebRTC terminal and IMS terminal. At the level of signaling and media, the interworking gateway is designed. While supporting the negotiation conversion from ROAP signaling of WebRTC system to SIP signaling of IMS system, it is necessary to realize the interworking of media channels of the two systems at the same time. The function of negotiation and coding conversion of media session is realized. Based on this research, this paper introduces the call service flow and the function partition of each module of the interworking gateway in detail, and designs the state machine of the call module. According to the design, the interworking gateway can be divided into signaling gateway and media server, signaling gateway is responsible for signaling session negotiation, media server and communication both sides establish media P2P direct connection, which is responsible for relay and forward of media stream. Finally, the function and performance tests are carried out to verify the reliability and availability of the system.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.092

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