P2P Media Streaming:a New Type of Media Streaming Service Architecture
P2P流媒体：一种新型的流媒体服务体系

Media streaming will become the mainly driving force for future broadband network application. But media streaming imposes a high load on the underlying network and the streaming server, and there still exists many difficulties for deploying it in a large-scale. IP Multicast could be the best way to overcome this drawback since it was designed for group-oriented application. However, its deployment on the Internet is still limited due to several fundamental concerns. CDN (Content Delivery Network) push the content and service to the Internet edge, which could alleviate burden on media servers and network infrastructure.but normal ICPs could not afford the expensive charge. The recently rising Peer-to-Peer technologies has huge potential on efficiently resource usage, system scalability and so on. P2P media streaming can efficiently using large mount of clients' resource which have been ignored before, and it will become a cost-effective media streaming service architecture. In this paper we first point out exist challenges for P2P media streaming , then mainly introduced some recent research result such as protocol of multicast tree, QoS guarantee and incentive mechanism and so on. Some exist problems are discussed. The orientations of the future research are also given.