QDB-AQM:基于排队延时的网关拥塞控制设计

提出了一种基于排队延时的主动队列管理(AQM)算法,该算法力求达到高吞吐量、低排队延时、短队列长度、低丢失率和较好的公平性能,相对于其他AQM算法具有实现简单的特点. 通过排队延时代替Drop Tail网关中分组丢弃的方法监测拥塞,并设置往返时间(RTT)估值作为拥塞探测的单门限,如果某分组排队延时超过该门限,则根据显式拥塞指示(ECN)机制标记该分组以通知TCP源端采取相应措施以响应拥塞.在ns-2下仿真表明该算法能达到预期的性能.

QDB-AQM: the Design of Congestion Control in Gateways Based on Queueing delay

An active queue management (AQM) algorithm based on queuing delay is proposed. The algorithm aims to achieve higher throughput, lower queuing delay, short queue size, lower loss rate and better fairness; it has characteristics of simple implementation relative to other AQM algorithms. The key idea is to monitor congestion by queuing delay instead of packet dropping in Drop Tail gateways, and set the estimated value of round trip time (RTT) as the single threshold of congestion detection. If the queuing delay of a packet exceeds the threshold, the packet will be marked according to the mechanism of explicit congestion notification (ECN) to notify transmission control protocol (TCP) source to take measure to respond congestion. Simulation on ns-2 shows that the algorithm is with desired performance.