关键词: 拥塞避免, TCP Vegas, 公平性, NS2

Abstract: The TCP Vegas' performance is better than the traditional TCP protocol in many ways. However, studies have shown that TCP Vegas has some defects in its congestion avoidance mechanism. They include that TCP Vegas has a poor performance when it competes with TCP New Reno, and it is not fair to the previous connections. To solve these problems, the authors proposed an improved congestion avoidance algorithm, called TCP Vegas-W. The algorithm did not depend on the buffer management scheme implemented at the routers and hence could be implemented solely at the end host. The experimental results show that the improved algorithm can get better performance in the wired network and it is a good solution to the problems of Vegas.

Key words: congestion avoidance, TCP Vegas, fairness, Network Simulator version 2 (NS2)