PID Congestion Control in ATM with Propagation Delay

摘要

Recently there have been many methods for rate control methods as applications of control theory. This paper considers congestion control in an ER system of ABR class in ATM as an example, and proposes a PID-type control rule under the existence of propagation delay. In the ATM switch, we predict the buffer level after time which equals the propagation delay elapsed. Based on the difference between the predicted and target values, a QoS value is calculated. It is stored in the ER field of an RM cell, and sent to each source. The connection sets the transfer rate corresponding to the extent of satisfaction and the QoS service class. We show conditions for the control parameters in order to stabilize the buffer level.