一种提高XCP协议在大RTT差异环境下的鲁棒性方法

现有TCP协议的拥塞控制机制存在很多不足,XCP(eXplicit Control Protocol)协议采用显式反馈的方式有效地克服了这些缺陷.XCP协议能容忍数据流之间一定的RTT差异,但当这种差异超出一定范围时,XCP协议性能恶化,变得不稳定.通过分析XCP协议路由控制周期与数据流RTT的关系,提出了一种控制周期根据RTT差异程度而自适应调整的方法,消除了系统振荡.仿真数据表明,该方法能有效地提高XCP协议在数据流RTT差异较大的环境下的鲁棒性,同时不给路由器带来过大的计算负担.

Increasing Robustness to RTT Variance for XCP

The eXplicit Control Protocol(XCP) was developed to overcome some of the limitations of TCP,such as unclear congestion implication,low utilization in high bandwidth delay product networks,unstable throughput and limited fairness.XCP,however,is robust only for some range of RTT variance.The performance of XCP becomes worse and oscillating while beyond the range.The relationship between router's control interval and flows RTT variance is analyzed,and a method to make the control interval adaptive to the syste...