Based On Catv And Ip Network-integrated Multicast Video System

With the development of network technology and application, video-related applications attract more and more interests from people. Due to the requirements of stable and high bandwidth, the video service can't be widely employed in Internet. However, the CATV network can provide the stable and high-bandwidth downstream channel. The topic of this thesis is how to integrate the CATV network with Internet to provide multicast video services with high qualities.My main works include four important aspects:1) A multicast video platform, which combines CATV network with Internet network, is proposed with the characteristic of interaction.2) Delivering two types of data on the CATV network as downstream channel-the datagrams based on the SAP/SDP protocols for announcing and describing the video program, and the programs, which include the video file transmitted based on the reliable multicast technique, and the video streaming transmitted with the qualities of stability and high-speed based on the multicast technique. Guaranteed by this mechanism, the video sending and receiving are effectively correspond with each other in the single-direction CATV network.3) Providing the interactive services via the Internet as interactive channel, such as video on demand, video chat. The interactive messages, such as the demand request in video on demand and the plain text in video chat, are delivered over the Internet. The video streaming involved in video on demand and video chat, is delivered over the CATV network. The mechanism ensures the interactivity and the stably, high-speed delivering of video streaming.4) The file distributing model based on Agent technology is proposed, over which the content of the platform is loaded in an automatic and intelligent manner.The multicast video platform is designed and implemented to satisfy the above for requirements, which has been employed in the system of the informationalization of village in Zhejiang province, and tested run in the town of Yangxun bridge. The platform is accepted by the users because of the fine effects of the video services.The paper begins with an introduction of the framework of the multicast video platform. In the following chapters, the key techniques in our platform for the above four requirements are interpreted, and based on the research of the techniques, the design and implements of main modules are depicted. In chapter 5, the application of our platform is introduced briefly. At last, a summary of current work and the future work are proposed.