Adaptive MAC Protocol for Throughput Enhancement in Cognitive Radio Networks

Cognitive radio technology has been proposed to share the scarce spectrum resources without disturbing the legacy devices of wireless network. The cognitive radio device is allowed to use the spectrum only when it does not cause any interferences or collisions to the incumbent users. We suggest an adaptive MAC protocol for the purpose of a throughput enhancement in cognitive radio networks. Assuming the channel status is dynamically known to the devices, they change their transmission mode between frame recovery mode and dual transmit mode according to the channel status. When the cognitive channel is hard to use due to frame errors, the channel is used for the frame errors recovery. Otherwise, in addition to its own legacy channel, the cognitive channel can be used to increase the throughput. In this paper, we study the effect of using additional channel in the cognitive networks, and prove an adaptive method of MAC protocol in the interest of throughput enhancement in cognitive radio network, and prove the performance of our proposed mechanism by simulations.