基于延时预测的TCP实时视频传输方法  

A real-time video transmission method over TCP based on delay prediction

作　　者：熊永华[1] 吴敏[1] 贾维嘉[2] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083 [2]香港城市大学计算机科学系,香港999077

出　　处：《中南大学学报（自然科学版）》2010年第4期1449-1456,共8页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(60425310);香港城市大学战略发展计划项目(7002102;7002214);中南大学自由探索计划资助项目(201012200196)

摘　　要：对TCP实时视频传输过程进行分析,指出发送延时是影响基于TCP的实时视频传输端到端延时的关键因素,并可通过其大小来判断视频帧的播放质量;提出一种递阶式马尔可夫预测模型,该模型通过输入视频帧长度、丢包率、网络往返时间和TCP拥塞窗口大小预测视频帧的发送延时,使用NS2(Network simulator 2)进行模拟。研究结果表明:在RED(Random early detection)策略下,可以通过模型的预测值来判断视频帧是否适合采用TCP传输,能为基于TCP的流媒体传输策略提供重要参考。The process of real-time video streaming across the Internet using TCP（transmission control protocol） was analyzed,and the sending-delays were found to be the critical influencing factors on the end-to-end delays of real-time video frame using TCP.A method that utilizes the sending-delays to judge the playing performance of the video frames was presented.A recursive Markov prediction model was proposed to predict the sending-delays of real-time video frames with input parameters as video frame lengths,network loss ratio,RTT（Round trip time） and TCP congestion window size.The NS2 simulator was introduced.The results show that the prediction value of video frame sending-delays can be used to determine whether it is feasible for a video frame to be transmitted using TCP,which provides importance reference for streaming transmission scheme based on TCP.

关 键 词：TCP 马尔可夫 实时视频 延时预测 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]