A flow congestion control scheme of ATM networks based on fuzzy PID control

One of the most important problems in ATM networks is congestion control. As a mechanism to realize the feedback control, ER scheme is effective to capture the variation of the network environment and avoid the congestion. In this paper, to overcome the effect caused by many uncertain elements in modeling and control, the nonlinear feature in the network protocol, the fuzzy controller is designed, which consists of three partial controllers to determine the control parameters. The rule bases are given through experiments. The results of simulation show better dynamic performance and robustness and guarantee the QoS of the network.