一种基于时移电视系统的副本放置策略

摘要

A hybrid replica placement policy for replica placement time-shifted IFTV system is proposed. Hie policy place the replica of streaming data to memory of each node, to improve clients' QoS and reduce startup time as well as channel zapping delay. It is derived by the study of the problems, which refer to load balancing and minimization of response time, the relation between replica placement and degree distribution, and the analysis character of the data of IPTV. The simulation results indicate that the proposed policy can improve the success rate effectively with little storage space.%针对时移电视系统中的副本放置问题,通过将流式传输的数据片副本有计划地放置在路由节点缓存空间内,以提高用户体验度,减少初始化时延和频道切换响应时延.研究了副本放置问题中的负载均衡和响应时延最小化等问题,总结了节点连接度与副本放置之间的关系,在分析网络电视数据特点的基础上,提出一种混合副本放置策略.仿真结果表明,该策略能够有效提高查询消息搜索成功率,且占用缓存空间较小.