Design of TCP/AQM congestion tracking controller with finite time and nonlinear disturbance observer

This paper studies the finite time tracking control problem for TCP/AQM system with nonresponsive UDP flows. A novel congestion control algorithm is proposed based on the barrier Lyapunov function, backstepping and nonlinear disturbance observer. A modified barrier Lyapunov function is used to limit the queue tracking error of the TCP/AQM system, which improves the dynamic performance of the closed-loop system and all signals converge in finite time. In order to suppress the influence of external disturbance on the system, a nonlinear disturbance observer is designed to approach external disturbance, and a good compensation effect is achieved. The feasibility and superiority of the proposed method are proved by simulation verification and analysis.