TFRC协议友好性与平稳性改进算法研究  

Research of the Algorithm to Improve Fairness and Smoothness of TFRC Protocol

作　　者：姜明[1] 吴春明[2] 张旻[1] 蒋翊[2] 

机构地区：[1]杭州电子科技大学软件与智能技术研究所,浙江杭州310018 [2]浙江大学人工智能研究所,浙江杭州310027

出　　处：《电子学报》2009年第8期1723-1727,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60773182);国家863重大项目(No.2008AA01A323);浙江省2007年度科技计划项目(No.2007C21031)

摘　　要：本文针对TFRC(TCP-Friendly Rate Control)流与TCP流竞争带宽时的友好性问题,分析了影响TFRC协议TCP友好性的因素,通过对TFRC速率计算公式中丢包率的不同幂级项引入权重系数,增加网络拥塞严重时的发送速率,减少网络拥塞较轻时的发送速率,从而降低了网络拥塞程度对TFRC流传输速率的影响.仿真实验表明该方法对TFRC协议具有较明显改进作用,提高了TFRC流的传输平稳度和TCP友好性,从而能更有效地适应多媒体流的传输要求.This paper analyzes the factors which affect the fairness between TFRC protocol and TCP protocol, and introduces two weighted coefficients to calculate the packet loss event rate which is used to calculate the sending rate in equation of TFRC pro- tocol so as to adjust the sending rate based on network congestion level. Simulation results show that through this method,the fairness and smoothness of TFRC at different congestion levels are effectively improved, thus meeting the requirements of multimedia stream more effectively.

关 键 词：TFRC 友好性 平稳性 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]