Design And Implementation Of The Media Stack For IMS Terminal

In the global 3G wave and NGN construction high today, in mobile communication to the IPnetwork structure evolution tendency, the IMS(IP Multimedia Subsystem,IP MultimediaSubsystem) as the next generation of communication network (NGN) realize integration schemes,the network structure. In NGN market IMS occupies an increasingly important position, the startof the new telecom business model, make whole information industry has grown rapidly, forwireless and wired fusion has a very important symbolic significance.The paper combines the actual situation of the current network carried out a detailedanalysis of the needs of the media stack on the IMS terminal, and draw on the deployment of thecore components of the media stack needs to be done the conclusion of the two aspects toconsider: One is the control of signaling, mainly relating to the calls, signaling the processing ofsignaling; The other is a transmission control, main is news to what kind of flow waytransmission. In order to solve the difficulties and problems of, this paper in reference to theexisting protocol stack after model, respectively, to SIP protocol stack, RTP/RTCP protocol stackand MSRP protocol stack as part of the overall media stack, through to the three protocol stackof simulation and realization, from the overall to the main functions of media stack, satisfybasically to media stack multimedia business requirements.The key points of this paper include: First, IMS terminal in communication process eachfunction module detailed work process; Second, signaling control protocol SIP throughout theprotocol stack the role and the implementation; Third, RTP/RTCP agreement, MSRP agreementand SIP protocol combinations application, instant message real-time transmission.