关键词: IPTV，频道切换延时，组播，节点能力，路径能力

Abstract: In order to reduce the channel zapping time of the IPTV, this paper presented a new multicast algorithm based on the priority route performance evaluation which maintains the multicast tree. First of all, the priority route set was got according to the distance between the candidate parent node and the source node, then it was described that the candidate path performance was evaluated by using the peer performance assessment algorithm, ultimately, the optimal parent node was obtained based on the level of path performance, and then the multicast tree management was completed. Analysis and simulations show that this algorithm improves the efficiency of the multicast tree effectively, reduces the channel zapping time of the IPTV and enhances the QoE(Quahty of Experience).

Key words: IPTV,Channel zapping time, Multicast,Peer performance,Path performance