Availability Model and Analysis for Contention-Based Medium Access in Cognitive Radio Networks

• Eduardo Vasconcelos UFPE
• Kelvin L. Dias UFPE
• Paulo R. F. Cunha UFPE

Abstract

In general, the availability calculus of the opportunistic access in Cognitive Radio (CR) is based on a simple ON/OFF model, which represents the Primary User (PU) behavior. We propose and evaluate a new model to study the availability that combines a contention based MAC (Medium Access Protocol), Secondary Users (SUs), and PU behaviors. This composed model enabled us to evaluate the relationships between parameters (e.g., Number of SU, Access Time of PU, time Interval between appearances of PU) and availability. A sensitivity analyses was carried out and, among other findings, it has been concluded that the number of SU exerts an influence on availability greater than any other evaluated parameter.

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