极小极大输出反馈控制的主动队列管理算法研究

Active Queue Management Algorithm for Network System Based on Minimax Output Feedback Control Theory

研究主动队列管理(AQM)网络系统的基于极小极大方法的输出反馈鲁棒控制器设计问题。利用线性矩阵不等式(LMI)处理方法和Lyapunov稳定性理论,将AQM网络拥塞控制问题转化为时滞系统的极小极大控制问题,得到在干扰最大的情况下极小极大输出反馈控制器存在的充分条件,求得的极小极大控制器不仅保证闭环系统渐近稳定,且使闭环系统性能指标的上界最小。仿真表明,所设计的控制器具有较强的干扰抑制能力。

This paper investigates a robust output feedback controller for active queue management(AQM)by taking time-delay and disturbance of unpredictability into account.The AQM network congestion control problem is solved by the linear matrix inequality(LMI)approach and Lyapunov stability theory.Considering the worst case disturbance,a sufficient condition for the existence of minimax controller is obtained based on minimax theory.The proposed controller not only guarantees the closed-loop system which is asymptotically stable,but also makes the performance indicators upper bound smallest.The simulation results indicate the disturbance attenuation capability of the control algorithm.