Service differentiation using p-persistent CSMA/CA

Scope and method of study. The problem of service differentiation in wireless LANs is of utmost importance compared to wired networks. Multimedia communication via wireless LANs needs larger bandwidth compared to non-multimedia communications. Hence, a service differentiation scheme to enhance the distinction of service offered to different class priorities is essential. The objective of this thesis is to study the problem of providing service differentiation using proposed p-Persistent CSMA approach and the existing contention window scheme. The areas of this study include service differentiation schemes in p-Persistent CSMAs, various contention window schemes and a number of adaptive service differentiation schemes. Also, a service differentiation rule is used to distinguish the services offered to various classes of traffic.; Findings and conclusions. Service differentiation for different classes of priorities using proposed p-Persistent version and existing contention window scheme were studied. The performance (average throughput & average media access delay) of both p-Persistent CSMA and contention window scheme was studied in depth. A service differentiation rule was implemented to distinguish the priorities among different classes of traffic. The parameters of both the schemes were chosen to be comparable. The p-Persistent CSMA version and contention window scheme works successfully for the two different scenarios (Scenario 1: load varied & data generation rate constant, Scenario 2: data generation rate varied & load constant). Finally, the p-Persistent version when analyzed offered service differentiation with lower delay as the network load increases.