ABR traffic control over ATM network using fuzzy immune-PID controller

In this paper, we address an end-to-end congestion control algorithm for the available-bit-rate (ABR) traffic in high speed asynchronous-transfer-mode (ATM) networks. A fuzzy immune PID controller is designed to overcome the adverse effect on ATM network caused by uncertainties such as the number of users, the available-bit-rate bandwidth, and the transmission propagation delays. Further, an algorithm is proposed that can guarantee the minimum cell rate in order to ensure the fair and full utilization of the bandwidth. Simulation investigation has been carried out and the results show the proposed control system is robust and performs effectively in adaptive mode. Thus the quality-of-service (QoS) is guaranteed too.