移动对等直播流媒体系统的服务质量保证机制研究  

Research on QoS Mechanism for Mobile P2P Live Streaming System

作　　者：蒋文斌[1] 余林琛[1,2] 廖光贤[1] 廖小飞[1] 王鹏程[1] 陈珍[1] 

机构地区：[1]华中科技大学计算机学院服务计算技术与系统教育部重点实验室,湖北武汉430074 [2]中国地质大学(武汉)计算机学院,湖北武汉430074

出　　处：《计算机工程与科学》2012年第10期11-16,共6页Computer Engineering & Science

基　　金：国家自然科学基金资助项目(60903173;60973133)

摘　　要：随着移动网络及移动智能终端的发展和日益普及,移动对等(P2P)网络流媒体方面的研究已成为当前的热点。然而,P2P流媒体的移动化面临两大问题,一是流媒体的差异化服务,二是终端移动过程中的服务质量保证。针对终端的差异性,本文提出了自适应多码率服务的思想,在一个P2P节目流拓扑中,发布多个子流,用户根据自己的网络状况和能力,缓冲全部或者部分子流,并根据网络环境的变化,动态地改变自身缓冲和播放的流,为邻居节点提供差异化的服务;同时提出了一种跨域移动服务质量保证机制,包括数据预缓存、数据暂存等策略。实验证明上述方法能有效提高移动对等直播流媒体系统的服务质量。With the development of mobile networks and smart mobile terminals, researches on mobile P2P live streaming systems become popular. However, extending the P2P live streaming system faces two obstacles： one is the differentiated services and the other is the Quality of Service （QoS） dur- ing the domain-across movement of mobile terminals . In the paper, an adaptive multi-rate streaming service method is proposed to deal with the differences between mobile terminals and PCs. Multiple substreams of one stream with different rates are distributed in one P2P distribution topology. Clients buffer all or part of sub-streams according to their situations and abilities. They can adaptively change their buffer and the playing sub-stream according to the variation of the network environment, and provide differentiated services for their neighbors. Meanwhile, a cross-domain mobile QoS mechanism containing data pre-buffering and temporary-storing is proposed. Experimental results demonstrate the efficiency of the ways presented for the QoS in the Mobile P2P Live Streaming System.

关 键 词：移动对等网络 流媒体 跨域移动 多码率 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]