主动队列管理中的APD和APID控制器的设计

APD and APID Controllers for AQM

AQM策略作为终端系统上网络拥塞控制的一种补充,能在保证较高吞吐量的基础上有效地控制队列长度,从而实现控制端到端的时延,保证QoS。理论上,很多AQM机制可以最终归结为PID控制器。因此在研究PD和PID控制器模型的基础上,设计了两种新的适应性控制机制,即APD和APID控制器,使系统在网络变化的情况下能提高其稳定性和网络性能,并仿真验证了这两种新算法的稳定性和网络性能。

As the supplement of the network congestion control, AQM （Active Queue Management） can effectively control the queue length and realize high throughput, so it can control the delay from end to end and guarantee the OoS of the system. In theory, many AQM mechanisms can be reduced to be PID controllers. Based on the model of PD and PID controller, two new adaptive control mechanisms, i.e. APD and APID controllers, can improve the system＇s stability and performance. Simulations suggest that the proposed algorithms can achieve good system performance and stability.