Active queue management algorithm for network system based on minimax control theory

A robust controller for active queue management (AQM) with time-delay and disturbance of unpredictability is studied. The network congestion control problem is solved by using the linear matrix inequality (LMI) approach and Lyapunov stability theory. A sufficient condition for the existence of minimax controller is obtained based on minimax theory when the worst disturbance is considered. The proposed controller makes the closed-loop system not only asymptotically stable, but also bounded. The simulation results indicate the disturbance attenuation capability of the control algorithm.