基于延时抖动趋势的分层组播方案  

Layered Multicast Based on Delay-Jitter Trend

作　　者：刘梦娟[1] 魏小东[1] 王勇[1] 

机构地区：[1]电子科技大学计算机科学与工程学院成都611731

出　　处：《电子科技大学学报》2011年第5期747-752,共6页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60903155);中央高校基本科研业务费(ZYGX2010J077)

摘　　要：针对多速率拥塞控制中存在的周期性丢包、拥塞响应速度缓慢等问题,提出基于延时抖动趋势的分层组播方案LM-DJT。该方案通过延时抖动趋势来推测当前网络状况,使接收端能够对网络拥塞进行早期检测,并将其引入到改进的TCP吞吐量公式中,用以估计当前传输路径的可用带宽,并据此进行相应的层次订阅调整。仿真实验表明LM-DJT能很好地适应网络环境的异构性,在保证带宽公平分配的情况下,具有较快的收敛和拥塞响应速度,引入较少的丢包。Layered multicast is a promising solution to address the problem ofmulticast congestion control in heterogeneity network. However, schemes using this solution suffer from slow response time and lack of fairness, and induce a lot of loss by slow response and failed join experiments. In this paper we propose a new layered multicast based on delay-jitter trend （LM-DJT）. LM-DJT introduces the delay-jitter trend model into an amended TCP throughput equation to estimate the TCP-friendly transmission rate, and each receiver adjusts its subscription layers according to the estimated transmission rate. Our simulation results show LM-DJT converges fast to the optimal layer of subscription, induces less loss to track the available bandwidth, and has inter-session fairness and TCP-friendliness.

关 键 词：延时抖动趋势 分层组播 TCP友好 TCP吞吐量公式 

分 类 号：TP393.02[自动化与计算机技术—计算机应用技术]