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

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.