Study And Implementation Of IMS Data Conference In Media Server

With the rapid development of mobile communications, many organizations for standardization and countries are concentrating on the research of standards and technologies of 3G (3rd Generation Mobile Communications). Meanwhile, 3G networks have been launched and providing commercial services in Japan, Korea, Europe and USA. As one of the three mainstream wireless interface standards for 3G recognized by the ITU (International Telecommunication Union), WCDMA (Wideband Code Division Multiple Access) system, which inherits the benefits of standardization and open networks from the GSM (Global System for Mobile Communications) system, has been developed maturely and deployed widely.From the carrier's perspective, service capability and service content are considered to be the key concerns for sticking the existing customers and also attracting new ones. For 3G and IMS (IP Multimedia Subsystem) networks, while multimedia content is widely accepted to be the dominating traffic conveyed by the network, multimedia based applications and services will be considered to be the most valuable ones in the industry.The development of 3G is a huge chance for data conference and even net conference. Now in 2.5G, voice service is the most important service, but in 3G, data service will take the dominating position,which depends on the technigue and transmission characteristic of the 3G. The data conference in internet is more mature, and is used in various fields. Since the data , broad-band and multi-media conception are promoted in 3G, the foreground of data conference is also thought be very luciferous. In the next serval years, As well as the technigue is becoming more and more mature, it will have a good development.The media server is a term of NGN, which is called Media Resource Function (MRF) by 3GPP. As one of the key devices on the NGN and the 3G Network, media server provides various media resources and multimedia operation environments for multimedia services.Based on the 3G/IMS network, this paper proposes an implementation scheme for the data conference function. The design are based on the audio and video conference, using the third-part data collaboration server, and SIP+T.120 scheme. The scheme make a good contribution on the development of the data conference in 3G The article is organized like this:in the exordium of the first chapter, we firstly introduce the concept, feature and network architecture of the IMS and the data conference, then take a comparison between them, and after that, we point out the significance of the data conference on IMS, it also introduce the foreground of the problem in the world. In the chapter 2, we introduce the architecture, function and the capability of the Media Server can provide. The third chapter introduces relational protocols of the data conference, which includes SIP(Session Initiation Protocol), ITU-T H.323 protocol , and T.120 series protocols. We also make a comparison between the implementation of SIP and H323 data conference. In the forth chapter, the design goals of the media server are brought forward at first, then we give the design of the data conference. At the base of the research on data collaboration and SIP protocol, we figure out the signaling sequence diagram of whiteboard, application share,and file transformation. At last the detailed design and implementation of the sub-system are given out.Including the resource control module,data conference communication module,and data server module. This chapter supplies the key data structures and algorithms; In the last chapter, there is a summarization of progress and a list of the follow-up work.