For the problem of congestion control in transmission control protocol(TCP) networks, a sliding mode active
queue management(AQM) algorithm based on T-S fuzzy model is proposed. Considering the uncertainties and time-varying
delays in TCP networks, a T-S fuzzy model is obtained for nonlinear TCP networks model. An asymptotically stable sliding
surface is designed by using LMI. Moreover, a reaching condition is presented in order to further constrain chattering. Based
on the reaching condition, the controller can constrain the oscillation of the queue length in router effectively. Simulation
results show that the proposed algorithm has better stability and robustness than common sliding mode AQM algorithm.

TCP networks congestion control;active queue management;sliding mode control;T-S fuzzy model; reaching condition