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In this paper we are proposing a new concept in MAC layer protocol design forCognitive radio by combining information held by physical layer and MAC layerwith analytical engine based on knowledge based reasoning approach. In theproposed system a cross layer information regarding signal to interference andnoise ratio (SINR) and received power are analyzed with help of knowledge basedreasoning system to determine minimum power to transmit and size of contentionwindow, to minimize backoff, collision, save power and drop packets. Theperformance analysis of the proposed protocol indicates improvement in powersaving, lowering backoff and significant decrease in number of drop packets.The simulation environment was implement using OMNET++ discrete simulation toolwith Mobilty framework and MiXiM simulation library.

Cross Layer Aware Adaptive MAC based on Knowledge Based Reasoning for Cognitive Radio Computer Networks