Robust TCP packets queue control

This paper is concerned with the control of network data transfer so as to avoid internet traffic congestion. Specifically, a new Active Queue Management (AQM) algorithm supporting the Transmission Control Protocol (TCP) is suggested. To this purpose, the TCP dynamics is described by means of a second–order model with delayed input obtained from the linearization of an efficient nonlinear fluid–based model. By applying the Artstein transformation, the input–delayed model is first reduced to a delay–free model. Then, a feedback AQM controller is designed for this model using a Sliding Mode Control (SMC) strategy. Simulation results show the effectiveness of the proposed AQM technique.