一种协同改进FAST TCP公平性算法

A Cooperant Improved FAST TCP Fairness Algorithm

针对同时到达多个FAST TCP连接时,新连接存在难以估测的传播延时而导致不公平性的问题,提出一种协同改进算法.该算法通过各连接充分利用源端获得的局部信息,协同合作确定同步回退时钟和最小回退因子.在无法直接通信的情况下,实现短暂同步回退清空缓冲队列长度,确保快速获得准确的传播延时和FAST TCP协议的公平性.NS-2仿真实验表明,该算法与其它相关改进算法相比,在失去了较小稳定性的情况下确保了各连接良好的公平性.

A cooperant improved algorithm is proposed,aiming at the problem of unfairness caused by the inaccurate estimation of the round trip propagation delay at the time of simultaneous connections of multiple FAST TCP.The synchronization back-off clock and the minimum back-off factor were determined via the full use of the locally available information cooperantly.Without direct communication of the FAST connections,the true propagation delay was accurately and quickly estimated,and the fairness was achieved for the buffer queue to empty occasionally.The NS-2 simulation results demonstrate that compared with other related algorithms,this improved algorithm can achieve fairness and higher stability.