【摘要】 基于网格技术提出了时移电视服务系统(GridTVOD,Time-shifted TV on demand based on grid).在GridTVOD系统中,系统组织基于Globus MDS,将视频服务器和服务节点组织为流媒体服务网格,视频数据传输采用P2P和Patching相结合,用户作为网格节点,在享受服务时,也作为服务端为其它节点提供服务.整个系统具有如下特点:1)采用流合并机制,有效地减少媒体服务器提供的基流数;2)采用分布式控制协议,系统具有良好的可扩展性;3)利用网格技术,为系统组织提供安全、有效的保障.更多还原

【Abstract】 A time-shifted TV service architecture based on grid was presented.In GridTVOD,media servers and service nodes composed a streaming media service grid,which was designed on the base of Globus MDS.The GridTVOD used a peer-to-peer approach to cooperatively stream video using patching techniques,in which each peer can serve as both a client and a mini-video server.It has the following properties:1)it utilizes a streaming combining mechanism to reduce the number of base streams in media server;2)it utilizes a distributed control protocol in a scalable way;3)it utilized grid technologies to provide a secure and efficient guarantee for the organization of service.更多还原