TCP modelling and predictive congestion control

This paper presents a comparative analysis of some models recently proposed in literature to represent the TCP protocol and its congestion control algorithm pointing out advantages and drawbacks. The comparative analysis also considers the results obtained with the NS-2 network'simulator to validate the different models. From this analysis a model is selected for control purposes and a generalized predictive controller is proposed to perform the TCP congestion control mechanism. The proposed controller can cope with the dead time of the process and handle the process constraints. Some simulations using NS-2 are used to show the good properties of the proposed model and controller in several cases such as variations in the time delay and communication bandwidth.