摘要： 研究了几种不同的TCP拥塞控制算法原理。通过对于TCP Reno和TCP Vegas协议的实验仿真,研究在不同的数据流和不同的网络条件下算法的性能差异。提出了一种改进的RTT估计方法,在拥塞避免阶段,采用时延的指数滑动平均值取代瞬时的RTT。实验表明,这种改进增强了TCP Vegas对于时延扰动的鲁棒性。

关键词: 拥塞控制, TCP协议, 环路时延, 服务质量

Abstract: This paper discusses different TCP congestion control strategies such as Reno, Sack, and Vegas. Simulation results are used to evaluate the performance of TCP Reno and TCP Vegas under different network conditions. Furthermore, it proposes a new method of round trip time (RTT) estimation, named exponential weighted moving average RTT. Simulation results manifest that improved TCP Vegas can maintain its performance against short time disturbance, which means a better quality of service.

中图分类号: 

• TP393.07