Gain-scheduling controller design for TCP/AQM considering router queue length and time-delay

In this paper, we design active queue management scheme for dynamical models of computer network based on control theory. TCP/AQM (transmission control protocol/active queue management) network models are nonlinear and including time-delay. Taking these characteristics into account explicitly, we propose a new design method of AQM controller. Especially, paying attention that time-delay is depend on queue length clearly, we suggest an appropriate gain-scheduling controller based on new type of linear parameter varying (LPV) systems with parameter-dependent time-delay. Effectiveness of the proposed method is evaluated by using matlab and ns-2 (network simulator ver. 2).