Performance evaluation of backpressure congestion control in the multistage model

The combination of reactive control with CAC or UPC has been proposed as th e congestion control method in ATM networks. As one of these methods, the a uthors researched the backpressure congestion control method and analyzed t he basic performance of the two-stage model. The model consists of the cong ested node and its next node; it was shown that the effect of congestion ca n be reduced in traffic that does not pass through the congested node by ad ding pushout rules to the next node. In this article, the discussion is extended to a multistage model that incl udes source, relay, and congested nodes, and the propagation time of conges tion in the network, the packet loss probability, and the average packet tr ansmission delay time are estimated by computer simulations. It is shown th at congestion can be reduced and the propagation of the congestion state al so can be decreased by the addition of pushout rules to backpressure conges tion control. (C) 2000 Scripta Technica.