TCP Vegas和TCP Reno的兼容性问题及其解决办法

讨论了TCP Vegas和TCP Reno之间存在的不兼容的问题.为了研究异构网络环境下两者共享带宽的问题,本文推导了吞吐量和Jain公平指数的解析表达式.进一步,就基于显示拥塞通告(ECN)技术和随机早期探测(RED)算法,提出了TCP Vegas的一个改进算法,保证了和TCP Reno的兼容性.最后用NS-2模拟了这个改进的算法,模拟结果表明改进的算法很好地限制了TCP Reno不公平地占有TCP Vegas的带宽.

A Solution to Compatibility between TCP Vegas and TCP Reno

This paper addresses incompatibility issues between TCP Vegas and TCP Reno.In order to investigate the bandwidth sharing between versions of TCP in heterogenous network environments,analytical expressions for throughput and Jain's fairness index are derived.Further,based on the Explicit Congestion Notification(ECN) technique and the Random Early Detection(RED) algorithm,we propose a new algorithm to be incorporated in TCP Vegas for securing its compatibility with TCP Reno.The new form of TCP Vegas is simulated using the discrete event simulator NS-2.Simulation results show that our new algorithm can effectively restrict TCP Reno from unfairly grabbing the bandwidth share of TCP Vegas.