一种新的逐跳显式拥塞控制机制及性能分析

随着具有高带宽高延迟特性网络的广泛应用,传统的拥塞控制算法已不能有效地工作,其中反馈时延的大小是影响拥塞控制算法性能的重要因素之一.反馈时延过大,将导致拥塞控制响应滞后,可能引起新的拥塞,因此有效减小网络的反馈时延是一个急待解决的问题.提出了一种新的逐跳显式拥塞控制算法(HBH-XCP),该算法基于XCP,在路径中以逐跳的方式将拥塞信号由路由器直接反馈至源端,使源端快速地响应拥塞事件.仿真实验表明,与XCP相比,HBH-XCP能提供更快的拥塞响应速度,使数据流获得更平稳的吞吐量,以及更小的时延抖动.

A new hop-by-hop explicit congestion control mechanism and its performance analysis

With the widespread use of the network with high bandwidth and high latency, traditional congestion control algorithm cannot work effectively any more, and the feedback delay is one of the important factors that influence the performance of congestion control algorithm. In high bandwidth delay product network, it may lead to a new congestion caused by excessive feedback delay. Hence, based on the explicit control protocol (XCP) architecture, a new hop-by-hop congestion control scheme is proposed, which uses the feedback from the router directly. Simulation result shows that compared with XCP, HBH XCP can response to the congestion faster, making the flow gain smoother throughput and lower delay jitter.