A comparative simulation of congestion avoidance techniques inbroadband ISDNs

摘要

A comparative simulation of two congestion avoidance techniques inbroadband integrated services digital networks (B-ISDNs) is presented.These broadband telecommunication networks are being designed forhandling, in their final form, a large variety of digital information,e.g. data, voice, video, facsimile, etc. Asynchronous transfer mode(ATM) has been recommended by the CCITT as one of the most promisingmeans of providing efficient and fast packet switched communicationamong B-ISDN users. An efficient and simple yet effective technique forcongestion avoidance in these broadband networks is presented, and itsperformance is compared with an existing technique. The performance isevaluated by simulating these two techniques for a network that supportsthree types of services. The bandwidth requirements (in terms of cellsper call) of these services are assumed to be geometrically distributed.Simulation results are presented in terms of call blocking probabilitiesfor different cases