一种提高VCP协议收敛速率的自适应算法

An adaptive algorithm to enhance convergence speed of VCP

变结构拥塞控制协议(Variable-structure Congestion control Protocol,VCP)是一种专门针对TCP在高带宽时延积网络下存在不稳定性而提出的新型拥塞控制协议,并具有保持稳定的低队列,高带宽利用率,公平性的优点.但在网络突发业务流的情况下,VCP存在收敛于稳定吞吐量速率过慢的问题.针对这个问题,本文分析了导致VCP收敛速率慢的原因,并提出了一种可以提高VCP协议收敛速率的自适应算法,同时给出了稳定性分析.NS2仿真结果表明,该方案可以提高收敛速率,并且保留了VCP原有的优点.

TCP becomes inefficient as the product of bandwidth and latency increases.To address this problem,the variable structure congestion control protocol（VCP） is proposed,which maintains low queue length,high utilization and fairness.However,VCP shows slow convergence speed with the burst traffic flows.In this paper,we firstly analyze the root cause of the slow convergence.Then we propose an adaptive algorithm to solve the problem and present stability analysis.NS2 simulation results show that our algorithm is effective and maintains the good properties of VCP.