Modelling and predictive congestion control of TCP protocols

Abstract

This chapter presents the modelling and congestion control of TCP protocols. A nonlinear and a simple linear model are presented to represent TCP including comparative results with NS-2 [1] network'simulator. The simple first order plus dead-time model is selected to design two linear controllers: a generalized predictive controller (GPC) and a PI plus an Smith Predictor controller (SPPI) which are compared to a nonlinear based predictive controller (NBPC). To evaluate the TCP congestion models and controllers, different situations are simulated using NS-2 considering the presence of UDP connections. The obtained results demonstrate that the SPPI offers the best trade-off between complexity and performance to cope with the process dead time and network disturbances. © 2012 Springer-Verlag GmbH Berlin Heidelberg.