基于批处理传输方案的移动流媒体系统的缓存分配算法

Cache Allocation Algorithm in Batching Stream Transmission Scheme Based Mobile Streaming Media System

该文介绍了在WCDMA网络中基于代理的移动流媒体系统以及评价其中代理服务器缓存分配算法性能的平均网络传输成本和移动终端的平均播放启动延时这两个指标;推导出在移动批处理(MBatching)传输方案下与这些指标相对应的节省值和综合节省值的计算公式;提出了适用于移动流媒体系统的,使所有流媒体节目的总的综合节省值最大的缓存分配算法。仿真结果表明,该算法与其他分配算法相比,可使总的综合节省值更大,节省更多的网络传输成本,取得更大的字节命中率。

In this paper, a proxy-based mobile streaming media system in WCDMA network is introduced. Two metrics, mean network transferring cost and mean playback startup latency of mobile terminals, to evaluate performance of a cache allocation algorithm in proxy are presented. Expressions for corresponding saving and integrated saving of the metrics under Mobile Batcing （MBatching） stream transmission scheme are developed. A cache allocation algorithm that applies to the mobile streaming media system is put forward to make the total integrated saving of all the streaming media program maximal. Simulation results demonstrate that the algorithm can make the total integrated saving larger, save more network transferring cost and achieve higher byte-hit rate than another allocation algorithm.