A Fuzzy Logic Feedback Controller for ABR Traffic Management in ATM Networks

This paper presents a fuzzy logic feedback explicit-rate controller for the management of available bit rate (ABR) traffic in asynchronous transfer mode (ATM) networks. In our proposed flow control scheme, the switches will monitor the traffic on each link and feed periodic information to the fuzzy controller. The information is used by the controller to calculate an explicit cell rate to be sent back to the sources. We use both the queue size and the change in the queue size, besides the cell rate and the change in the cell rate as information for the calculation of the explicit rate. A complete ABR flow control scheme is presented also. This scheme is designed to achieve high link utilization with low delays, minimum queue length oscillation, fast transient response and fair rate allocation. To highlight the merit of the proposed scheme, different experimental simulations are performed. Simulation results show that the design goals are achieved, and that the performance of our algorithm is superior when compared to other control algorithms.