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.
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.
出处
《苏州大学学报（自然科学版）》
CAS
2012年第1期40-46,共7页
Journal of Soochow University(Natural Science Edition)
基金
国电南瑞科技股份有限公司研究基金
