Abstract The cognitive radio is a secondary wireless communication system that can overlap the frequency band assigned to the primary system by recognizing the frequency status. Having maximum throughput of Secondary Users, Primary Users also need their own QoS factor guaranteed. We introduce the metric to protect primary users performance, named collision probability that gives insight around the SUs. Having satisfied this factor, we express a new access scheme using different sensing, back-off, and transmission mechanisms that prevents wasteful actions in the MAC layer. Also an algorithm proposed in order to maximize the transmission rate. Combination of these two plans is proposed in some paragraphs. Simulation results for each part are provided as independent sections and at last benefits of the overall scheme are reviewed.
Index TermsCognitive Radio, QoS, Multi-Bans Systems, Rate Prediction