Abstract: To solve the problem of finitetime congestion control for TCP networks with input constraint， network parameter uncertainties and nonresponsive flow disturbances， an active queue management algorithm was presented based on an adaptive terminal sliding mode control. One adaptive law was designed to estimate the certainty bound of the network system so that the certainty bound was not required to be known in advance. Another adaptive law was proposed to compensate for the effects of the system stability under control input saturation. A finitetime congestion controller based on terminal sliding mode control was designed in order to improve the convergent performance of the network system. Simulation results showed that the proposed algorithm not only has the property of finitetime convergence but also has good stability and robustness.

Key words: congestion control, active queue management, input constraint, terminal sliding mode control, finitetime control