关键词: 传输控制协议, 网络拥塞, 拥塞控制, 拥塞窗口, 拥塞避免, 加性增长因子

Abstract: Concerning the unsmooth growth of congestion window at congestion avoidance phase of TCP Reno, the traditional AIMD algorithm was researched and an improved congestion avoidance algorithm was proposed: a logarithmic function based on the growth of congestion window was adopted. In this new algorithm, additive factor is usually increased quickly when the network is doing well and less so when network situation is getting to congestion. The mathematical analysis shows the feasibility of the new algorithm, and its throughput, fairness and friendliness were evaluated by NS simulation. The simulation results show the effectiveness of the algorithm.

Key words: TCP, network congestion, congestion control, Congestion Window (CWND), congestion avoidance, additive factor