Design of Congestion Control Scheme for Uncertain Discrete Network Systems

For a class of uncertain discrete network systems, a sliding mode control algorithm is presented for active queue management (AQM) in order to solve the problem of congestion control in transmission control protocol (TCP) communica- tion. First, the sliding surface is designed based on linear matrix inequality (LMI) technique. Then, we analyze the mechanism of chattering for the discrete-time expo- nential approximation law, a modified one is presented and applied to the network systems. Simulation results demonstrate that the proposed controller has good sta- bility and robustness with respect to the uncertainties of the number of active TCP sessions, link capacity and the round-trip time.

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