基于P2P覆盖树网络的流媒体传输技术优化研究

Study of optimization in P2P streaming media technology based on P2P overlay tree

PeerCast是一个基于P2P网络的流媒体传输系统,各节点被组织成树状来进行数据的分发。但没有一个有效的机制来维护树的平衡和保证所选取的父节点是最佳的节点。在此基础上,对该系统进行优化,在媒体数据包上加一个字节用来标识当前节点与根节点的距离,并对节点间响应消息进行优化。实验结果表明,这些优化措施能够有效的维护树的平衡和降底数据传输时延。

Peercast is system which is used to transmit streaming media based on P2P network. In this system, all peers are organized as a tree to distribute data. But there is not an effective mechanism to maintain the balance of the tree and to guarantee the selected peer is the best peer. An optimization to the system is given. First, one byte is added to the media data bag to mark the distance of the peer to the root. Second, the response message between peers is also optimized. Last, the optimization is proved useful to maintain the tree＇s balance and reduce the transmission delay of data.