Sliding Mode Control for Uncertain Time-delay TCP/AQM Network Systems

For TCP linear dynamic systems with input time-varying and mismatched uncertainties, we propose an active queue management (AQM) scheme based on sliding mode control (SMC), which is aimed at robust stabilization of delay and uncertainties network system .The original uncertain time-delay system was first transformed into a delay-free system. Then based on the transformed system, an improved sliding mode control (ISMC) strategy is proposed; the robust sliding hyperplane is constructed from LMI with stability. The simulation experiments indicate that this scheme can track queue length very quickly under various network conditions, the system have strong robustness .The results also that this scheme outperformance the known ones with the traditional either proportional-plus-intergral or sliding mode controls.