A Novel Congestion Controller With Prescribed Settling Time for TCP/AQM Network System

Abstract

This paper studies the congestion control problem with prescribed settling time of nonlinear TCP/AQM network system. With the continuous improvement of users' requirements for network quality of service, it is a challenging task to quickly recover from the network congestion state to the normal network state. In the framework of backstepping, this paper studies how to realize congestion control according to the network state. The basic idea is to introduce a new nonautonomous differential equation to compensate the shortcomings of the existing arbitrary convergence time controller, and integrate it into the design of congestion controller to realize free-will arbitrary time congestion control. In order to reduce the packet loss rate and avoid reducing network efficiency caused by a large number of packet retransmissions, a finite-time performance function is introduced in the design process. The results show that using the proposed congestion mechanism, the congestion control problem with prescribed settling time can be solved by a nonpiecewise continuous arbitrary convergence time control law. The arbitrary time convergence of the system state is proved theoretically. Finally, the effectiveness of the proposed controller is verified by simulations and compared with related work.