RMFS:一种支持用户交互的流媒体调度方案  

RMFS: A Streaming Media Scheduling Scheme Supporting User Interactivity

作　　者：智英建[1] 汪斌强[1] 

机构地区：[1]国家数字交换系统工程技术研究中心,郑州450002

出　　处：《电子与信息学报》2009年第6期1470-1474,共5页Journal of Electronics & Information Technology

基　　金：国家973规划项目(2007CB307102)资助课题

摘　　要：基于组播的流调度算法能够有效降低服务器和网络带宽消耗。但研究表明,在用户进行VCR交互操作情况下,这些算法的性能将急剧恶化。该文提出一种有效支持用户交互的视频点播系统流调度方案:常规组播固定调度RMFS。RMFS采用基于请求类的接纳控制策略,并通过流合并机制来合并单播流。分析了RMFS方案的最佳组播间隔、最佳请求阈值和最小服务器容量需求。仿真结果验证了分析模型的正确性和RMFS方案的可行性。Multicast based stream scheduling algorithm can reduce server and network bandwidth consumption efficiently. But recent studies have indicated that user VCR interactive operations can severely penalize the scalability of these stream protocols. A new stream scheduling scheme, called Regular Multicast Fixed Scheduling （RMFS）, is proposed to support interactive playback control in video-on-demand system. RMFS adopts the class-based admission control mechanism to admit client requests and consolidates the unicast stream through stream merging mechanism. The optimal multicast interval, the optimal request threshold and server channel capacity requirements for the RMFS scheme are all analyzed. Extensive simulation results verify the correctness of the analytical model and the feasibility of the presented RMFS.

关 键 词：常规组播 用户交互 调度 流合并 服务质量 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]