PSO-PID: a novel controller for AQM routers

This paper presents an improved TCP/active queue management (AQM) model and a novel AQM control system, called particle swarm optimization (PSO) proportional-integral-differential (PID) controller, under large-delay network situations. First, we present the improved model including the delay term ignored by the previous simplified version. Using this model, we next design an AQM router applying PSO to tune efficiently the PID controller parameters. A simulation study shows that the PSO-PID controller controls congestion effectively and predictively and outperforms the random early detection (RED) and proportional-integral (PI) algorithms in terms of the packet loss rate, the link utilization, and so on