ANALYSIS AND SIMULATION OF CARRIER SENSE MULTIPLE ACCESS TECHNIQUES

Abstract

Due to the advantage that Carrier Sense Multiple Access (CSMA) technique offer over other medium access methods for network with low propagation delay, these are being extensively investigated and used presently. For design of networks using CSMA, it is important, therefore, to analyse and subsequently simulate the behaviour under real conditions. In the present dissertation, a review of the analytical results for non-persistent, 1-persistent and p-persistent CSMA is presented. The multichannel network using various CSMA protocol is also investigated. Simulation studies have been carried out for various CSMA protocols, for both single channel and multiple channels. The message delay variation with throughput and the throughput variation with offered traffic obtained from simulation are in agreement with the analytical results. Further, multichannel networks are decidedly superior than single channel networks at high load. Simulation :-results of a network with prioritized messages conform to the expected behaviour where the performance of the high priority message is not degraded with increase in low priority message load. The simulation have been carried out on a IBM PC-AT-386 using PASCAL