变结构拥塞控制协议的改进算法

Improved algorithm of variable structure congestion control protocol

在高速网络情况下,变结构拥塞控制协议(VCP)能够很好地解决网络瓶颈处带宽利用率的问题,其公平性相对于其他高速算法也有了很大的提高。但VCP拥塞状态划分不够精确,存在着粗粒度的拥塞反馈信息和收敛速度慢等方面的不足。针对以上问题提出了VCP的改进算法,结合源端检测延时信息和路由器反馈的负载因子来综合判断网络的拥塞状态,自适应地调节拥塞窗口。仿真结果表明该算法能有效提高VCP的公平性和收敛速度。

In high-speed network, Variable structure Congestion control Protocol （VCP） can efficiently solve the problem of bandwidth utilization in bottleneck and is more fair than other high-speed algorithms. But due to its imprecision of region dividing, VCP gives the coarse feedback information of congestion and has very slow rate of convergence. An improved algorithm was presented for the shortcomings mentioned above. Through combining the delay information measuring by the source and the degree of congestion feedback by the router, the congestion window was adjusted automatically. The simulation results show the improved algorithm can effectively improve the fairness and its convergence rate of VCP.