Ga-based Pid Active Queue Management Control Design For A Classof Tcp Communication Networks

摘要

Active queue management (AQM) is a key congestion control scheme for reducing packet loss and improving network utilization in TCP/IP networks.This paper proposes a proportional integral-derivative (PID) controller as an active queue manager for Internet routers.Due to the limitations of packet-dropping probability and the effects of propagation delays in TCP networks,the TCP AQM network was modeled as a time-delayed system with a saturated input.An improved genetic algorithm is employed to derive optimal or near optimal PID controller gains such that a performance index of integrated-absolute error (IAE) is minimized,and thereby a stable queue length,low packet loss,and high link utilization for TCP networks are guaranteed.The performance of the proposed control scheme is evaluated in various network scenarios via a series of numerical simulations.