媒體分發(fā)網(wǎng)絡(luò)存儲策略優(yōu)化

針對媒體分發(fā)網(wǎng)絡(luò)(MDN)系統(tǒng)中現(xiàn)有媒體分發(fā)存儲策略所存在的問題，為進(jìn)一步提高系統(tǒng)的性能和滿足更多用戶的點播請求，提
出一種基于分塊的存儲策略，該策略通過對每部影片進(jìn)行分塊及對所有影片塊定期進(jìn)行熱度的排序決定MS 和PN 所需存儲的相應(yīng)影片內(nèi)
容。通過NS2 仿真平臺所搭建的MDN 系統(tǒng)進(jìn)行實驗驗證表明，該存儲策略能夠更好地改進(jìn)用戶點播請求的響應(yīng)時間及本地數(shù)據(jù)擊中率。
關(guān)鍵詞：媒體分發(fā)網(wǎng)絡(luò)；流媒體；分塊存儲
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