未来高带宽网络中FAST TCP与TCP Vegas的公平性分析
Fairness analysis of FAST TCP and TCP Vegas over future high-bandwidth internet
朱小松1
作者信息
- 1. 南京邮电大学通信与信息工程学院,江苏南京210003
- 折叠
摘要
FAST TCP是先进的端到端拥塞控制协议,采用队列时延作为拥塞度量.由于不能准确测得精确的队列时延,此协议中存有不公平的隐患,即在某些持续拥塞场景下,不同时刻启动的FAST TCP流会受到差别对待,TCP Vegas中同样存在不公平问题.通过数学分析和ns2仿真对这种不公平问题进行量化,进而比较FASTTCP与TCP Vegas在公平性问题上的性能差异.结果证明了在将来高带宽时延乘积网络环境下,FAST TCP在公平性上要明显优于TCP Vegas.这为对FAST TCP协议的改进给出了有价值的参照.
Abstract
FAST TCP, a modern end-to-end protocol adopting queuing delay as a congestion measure. However, the lack of a precise measurement of queuing delay leads to a potential unfairness problem that FAST TCP flows may be discriminated against according to their starting times in a persistent congestion scenario, TCP Vegas also encounters the unfairness problem. The unfairness problem is quantitatively assessed by mathematical analysis and ns2 simulations, then, we compared FAST TCP with TCP Vegas. Consequently, FAST TCP demonstrates a competitive edge over TCP Vegas, under future high bandwidth-delay product environment. This conclusion will contribute to the improvement of FAST TCP for future reference.
关键词
FAST/TCP/TCP/Vegas/公平性/高带宽网络Key words
FAST TCP/TCP Vegas/fairness/high-bandwidth internet引用本文复制引用
出版年
2012
NETL
NSTL
维普
万方数据