Design of state feedback controller based on state-dependent delay modeling for congestion control in internet

Based on the fact that the queuing delay involved in the congestion control algorithm is state-dependent, the model of communication over TCP network protocol is transformed to a state-dependent delay differential equation. Hence, our paper firstly presented a sufficient condition for the stability of this class of systems. The results are presented in terms of linear matrix inequality (LMI). After, the general results obtained are applied to design an Active Queue Management (AQM) scheme for congestion control in internet. The proposed method is verified by simulation examples using NS software and the effectiveness and superiority of our method with respect to other control schemes such as PI and RED is shown.