媒体分发网络存储策略优化

针对媒体分发网络(MDN)系统中现有媒体分发存储策略所存在的问题，为进一步提高系统的性能和满足更多用户的点播请求，提
出一种基于分块的存储策略，该策略通过对每部影片进行分块及对所有影片块定期进行热度的排序决定MS 和PN 所需存储的相应影片内
容。通过NS2 仿真平台所搭建的MDN 系统进行实验验证表明，该存储策略能够更好地改进用户点播请求的响应时间及本地数据击中率。
关键词：媒体分发网络；流媒体；分块存储
Optimization of Media Distribution Network Storage Policy
XU Jin, ZHU Ming, ZHENG Quan, JIANG Jian-ping
(Key Lab of Anhui Network Communication System and Control, University of Science and Technology of China, Hefei 230027)
【Abstract】Aiming at solving the problems existing in media distribution storage policy of Media Distribution Network(MDN), and in order to
advance system performance and satisfy more media requests of users, this paper introduces a new storage policy based on block. This policy divides
every media into blocks and arranges all blocks due to its popularity regularly, to determine which media contents MS and PN need to store. In the
result of simulating MDN system using NS2 simulate platform, this new storage policy can significantly improve the response time of user and the
hit rate of local data.
【Key words】Media Distribution Network(MDN); stream media; storage based on block