基于延迟抖动分析的TCP友好拥塞控制算法  

A TCP-Friendly Congestion Control Algorithm and Its Application in Multimedia Data Transmission

作　　者：李强[1] 张新荣[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《计算机工程与科学》2007年第6期18-20,23,共4页Computer Engineering & Science

摘　　要：基于因特网的以UDP为传输协议的实时多媒体数据传输需要在保证实时性和可靠性的基础上,能够与因特网其他服务所使用的TCP协议公平共享有限的带宽。本文采用基于实时传输协议(RTP)和实时传输控制协议(RTCP)的反馈拥塞控制算法,提出一种简单的拥塞控制机制,使UDP数据流能与TCP数据流和平共处;研究了基于速率控制的TCP友好拥塞控制策略—TFRC,分析了其基本机制和关键问题;提出利用延迟抖动作为潜在拥塞信号来改进TFRC的速率控制机制,以适应实时业务低抖动的要求,并通过NS仿真验证了改进的TFRC算法对实时业务的良好性能。Real-time multimedia data transmission through the Internet is based on UDP. The transmission must be realtime and reliable. It also should be fair with the domain protocol TCP used by other services over the lnternet while sharing the limited bandwidth with TCP. Since packet loss and delay are usually caused by network congestion, we present a feedback congestion control scheme based on the real-time transport protocol （RTP） and the real-time transport control protocol （RTCP）, which can satisfy the real-time delivery system with loss and delay requirements. The paper discusses a rate-based TCP-friendly congcstion control mechanism named TFRC, studies its basic structure and some key details. In order to improve its performance of low jitter for real-time applications, we provide a new algorithm of TFRC by using the jitter as a warning congestion signal. NS simulation verifies the new algorithm.

关 键 词：多媒体数据传输 公平 反馈拥塞控制算法 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]