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.
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
