【摘要】 针对基于结构化P2P的时移流系统的维护开销较大、扩展性较差等问题,提出一个基于视频块的结构化时移流查询模型。根据节点缓存的首视频块进行分层,通过节点注册缓存中所有视频块的方法,降低层节点需要维护的路由信息,解决系统中缓存视频块不能完全找到的问题。实验结果表明,该模型具有较高的缓存命中率、较好的查询性能和较低的维护开销。更多还原

【Abstract】 In the current,the structured P2P-based time-shifted streaming system exists the problems that the copy of scalability is bad and the maintenance costs are higher.For resolving the problems,a structured query model based on video block for time-shifted streaming is proposed.By the hierarchy divided according to the first video block in the cache of node and all video block in the cache registered,it makes the routing information reduced which layer node needs to maintain and the problem resolved which the copy of time-shifted streaming can not be fully found.Experimental results show that compared with other model,this model has a better cache hit ratio,better lookup performance and lower maintenance overhead.更多还原