Abstract—Active Queue Management (AQM) is a key
congestion control mechanism for reducing the packet loss and
improving the network utilization in TCP/IP networks. This
paper discusses previously developed PI controller for AQM
and proposed a new GA-based PI-PD controller. It is able to
control present congestion reactively and also avoid the
incipient congestion proactively. Fast response to the changing
traffic is achieved by PD to maintain a desired queue length,
high link utilization and low packet loss. The optimized tuning
parameters are determined by selection of an Integral Square
Time Error (ISTE) as an objective/fitness function. We use ns
simulation to demonstrate the practical advantage of using
GA-based PI-PD controller over PI in managing constant queue
Index Terms—Congestion control, genetic algorithm (GA), integral square time error (ISTE), transmission control protocol (TCP).
R. K. Sundaram is with Indian Institute of Technology, Kanpur, India (e-mail: email@example.com). P. K. Padhy is with PDPM-IIITDM, Jabalpur (e-mail: firstname.lastname@example.org).
Cite:R. K. Sundaram and P. K. Padhy, "GA-Based PI-PD Controller for TCP Routers," International Journal of Machine Learning and Computing vol.3, no. 4, pp. 361-364, 2013.