改进TCP VEGAS拥塞控制协议及其在无线链路中的应用  

Enhanced TCP Vegas Protocol and Its Application in Wireless Networks

作　　者：刘靖[1] 陈芳炯[1] 韦岗[1] 

机构地区：[1]华南理工大学电信学院,广州510641

出　　处：《科学技术与工程》2007年第3期339-342,共4页Science Technology and Engineering

基　　金：国家自然科学基金(60402014);广东省自然科学基金(31390)资助

摘　　要：针对无线信道的随机丢包和时延抖动提出一种基于TCPVEGAS的改进拥塞控制算法。发送端基于确认包中的ec_位估计前向链路的拥塞概率,发生丢包时如果该拥塞概率没有增加则认为是信道引起的丢包。另外,利用低通滤波器对回程时间(RTT)进行平滑,作为TCPVEGAS拥塞控制的基础。基于NS-2的仿真实验验证了算法的有效性。An enhanced TCP VEGAS congestion control algorithm is proposed for wireless networks. To identify the packet loss and time-delay jitter caused by the wireless channel, the transmitter estimates the congestion probability based on the ec_bit in the ACK packets. In case of packet loss, the transmitter will not reduce the congestion window if the congestion ility does not increase. At the same time, a low-pass fiher is applied to smooth the RTr, so as to remedy the time-delay jitter, and the tilted RTr is used for standard VEGAS congestion control Simulation results based on NS-2 demonstrate the efficiency of the proposed algorithm.

关 键 词：拥塞控制 无线网络 TCP VEGAS 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]