支持随机访问的协作式P2P流媒体分发策略  

Collaborative P2P streaming dissemination strategy for random seek support

作　　者：许长桥[1] 吴志美[1] 李凯慧[1] 张源海[1] 

机构地区：[1]中国科学院软件研究所

出　　处：《通信学报》2008年第8期22-29,37,共9页Journal on Communications

基　　金：国家重点基础研究发展计划(“973”计划)基金资助项目(2007CB307100,2007CB307106)~~

摘　　要：提出一种协作式P2P流媒体分发策略CPSD(collaborative P2P streaming dissemination),采用平衡二叉树将媒体对象进行分布式分段预取缓存,用于媒体流快速定位,利用缓存重叠机制构建非结构化网络,用于节点间常规媒体流分发,对此分别提出媒体预取算法及邻居节点搜索算法,并给出节点失效恢复策略及支持随机访问的协作过程。仿真结果表明,与同类系统相比,在随机访问及网络波动过程中,CPSD更能够提供高平滑质量的P2P媒体流服务。A multimedia streaming dissemination strategy called CPSD （collaborative P2P streaming dissemination） was proposed in P2P network. In CPSD, video segments were prefetched and stored in peers along a balanced binary tree in distributable mariner, which assisted locating a given playing position quickly during streaming playback. Based on the buffer overlapping mechanism, an unstructured network was constructed as the routine network for video dissemination. A novel multimedia prefetching algorithm and neighborhood nodes search algorithm were proposed correspondingly, the nodes failure recovery scheme and collaboration procedure for random seek support were discussed in detail. The simulation results show that CPSD enables playing back videos more smoothly in the random seek and dynamic network conditions compared with other systems.

关 键 词：对等网络 P2P流媒体 平衡二叉树 非结构化网络 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]