基于模糊变结构控制设计一种鲁棒主动队列管理算法

基于模糊逻辑控制(FLC)提出了一种主动队列管理(AQM)算法.该算法将滑模控制器(SMC)和PI控制器相结合,综合了二者的优点,既对网络模型的不确定性、网络参数的时变性以及非TCP流所引起的网络抖动具有很强的鲁棒性,又可以通过PI控制使稳态误差最小.仿真结果表明该算法可以获得好的暂态和稳态响应,结果也表明在网络条件变化的情况下,该算法优于传统的PI控制和传统的变结构控制.

Design of a Robust Active Queue Management Algorithm Based on Fuzzy Variable Structure Control

An active queue management(AQM) algorithm is presented on the basis of fuzzy logic control(FLC).Combining the sliding mode controller(SMC) with a proportional plus integral(PI) control,the algorithm has both the advantages of SMC and PI controller.Thus,it is highly robust not only available to the uncertainties of network modeling uncertainties,time varying of network parameters and network jittering due to non-TCP sessions,but to minimize the steady-state error through PI control.Simulation results demonstrate that good transient/steady state responses to queue can be obtained by applying the proposed algorithm and that the algorithm is highly robust to disturbance under various networks conditions and outperforms significantly both the traditional PI control and traditional variable structure control.