基于BitTorrent的流媒体缓存及调度方案  

Scheme of Caching and Scheduling in the Streaming Media System Based on BitTorrent

作　　者：胡玉琦[1] 侯旭萌[1] 王智勇[2] 

机构地区：[1]燕山大学信息科学与工程学院河北省计算机虚拟技术与系统集成重点实验室,河北秦皇岛066004 [2]北京工业大学激光工程研究院,北京100124

出　　处：《北京工业大学学报》2013年第9期1343-1348,共6页Journal of Beijing University of Technology

基　　金：教育部科技发展中心专项研究资助项目(20091333110011)

摘　　要：为了有效地利用硬件资源,提供高质量的流媒体播放,提出了一种基于BitTorrent的流媒体缓存及调度方案.首先,利用媒体段的流行度和供求值定义了价值函数,提出了基于价值函数的缓存替换算法(caching algorithm based on value function,CAVF);其次,针对数据段及节点带宽的特征,设计了基于数据段优先级的调度算法(scheduling algorithm based on segment priority,SASP).实验结果表明:该方案提高了缓存命中率,降低了服务器的负载并增强了媒体播放连续度.To use the hardware resources effectively and supply higher quality service, a scheme of caching and scheduling in the streaming media system based on BitTorrent was proposed. First, the caching replacement algorithm based on value function （CAVF） took the popularity and the relation between supply and request of media segment into consideration. Second, according to the characteristics of the request data segment and the band of the node, a scheduling algorithm based on segment priority （SASP） was designed. Results show that the scheme improves the cache hit, reduces consumption of server＇s load and enhances the media player continuous degrees effectively.

关 键 词：BITTORRENT 媒体服务器 缓存替换 数据调度 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]