具有显式反馈的拥塞控制系统研究进展

Survey of Congestion Control Mechanism with Explicit Feedback

近年来越来越多的高带宽光纤网络和长时延的卫星网络融入到Internet中来。研究发现,传统TCP协议的拥塞控制机制随着网络带宽和延迟的增大而趋于不稳定。研究这种高带宽时延乘积网络环境下的拥塞控制机制成为热点研究课题,其中一个重要趋势就是采用显式反馈方法。本文讨论了基于IP网络中的显式反馈机制,包括传统ECN、各种类ECN机制以及新的拥塞控制协议;分析了各种机制的特点,总结了现有研究的问题并指出了几个值得继续研究的要点。

In recent years, as the Intemet evolves to incorporate very high-bandwidth optical links and more large-delay satellite finks, the congestion control mechanism in traditional TCP become inefficient and prone to instability. Research on the congestion control issue in the high bandwidth-delay product networks is very active. A important trend is to improve the congestion control with explicit feedback from routers in the transmit path. The explicit feedback mechanism based on IP networks, including ECN, ECN-like and some typical new congestion control protocols, are studied in this paper. Their strengths and weaknesses are also analyzed. At last, the further research aspects are pointed out.