一种基于部分访问特性的CDN流媒体内容改进分发策略

摘要

分析用户对流媒体文件的部分访问特性,以同一流媒体文件不同部分流行度为依据,对传统的CDN中流媒体文件等长分段策略做出改进；依据不同类型流媒体文件的流行度,对CDN中流媒体文件所的采用主动“推送”策略进行了改进,提出一种基于部分访问特性依概率的流媒体主动“推送”策略.最后通过仿真实验,证明改进后的分发策略可以有效地降低中心源服务器的负载,提高代理服务器缓存空间的利用率.%According to the analysis of partially access of streaming media, this paper first gives improvement of traditional uniform segmentation strategy of CDN mid— stream media files based on the characteristics that different parts of the same media files have different popularity. Next, improvements of the initiative "push" strategy of streaming media are given based on different type streaming media have different popularity, and then proposes a stochastic initiative "push" strategy based on their partially access. Finally, simulation experiments proved that the improved distribution strategy can effectively reduce the load of the central source sever and improve the cache space utilization of the proxy servers.