基于改进的控制时延主动队列管理算法

摘要

To decrease the impact of the burst,the controlled delay (CoDel)algorithm for active queue management was im-proved and a probabilistic optimized controlled delay (PCoDel)algorithm was proposed.The mechanism of dropping the packet by probability when packets enqueuing was joined and the adaptive mechanism was combined.Results of the NS2 simulation show the comparison with CoDel,sfqCoDel,PCoDel algorithms in the situation of light load,overloading and mixed TCP and UDP flows.Except the jitter performance,PCoDel has the advantages in throughput,packet loss rate,delay,link utilization rate and queue length.%针对控制时延主动队列管理算法(CoDel)在突发数据流到来时,大量丢弃数据包,降低网络性能的问题,进行改进,提出一种概率优化的控制时延主动队列管理算法(PCoDel),加入在包进入队列时根据概率丢弃的策略,结合自适应的机制。NS2仿真结果表明,PCoDel与CoDel、sfqCoDel算法相比,在网络轻载,重载以及 TCP 和 UDP 混合流的情况下,除抖动外,在吞吐量、丢包率、时延、链路利用率、队列长度方面均有一定优势。