Controller Design for Network Congestion Based on H_∞ Control Theory
Hui Hou · Communications technology · 2009
Aiming at the computer network with multidimension,nonlinearity,dynamic,uncertainty,an H∞ control approach to the active queue management(AQM) algorithm is proposed from control theoretic viewpoint. The paper focuses on RED. First,a dynamic model of AQM/TCP congestion control is constructed;then the asymptotical stability of the system is described by linear matrix inequalities(LMI) ,and the H∞ control for the general linear time-delay is solved by LMI toolbox in the MATLAB;then,the result is applited to the RED and the controller is obtained;Finally,the research is simulated on the NS2 platform,and the result shows that this algorithm could effectively solve robustness problem caused by uncertainty.