Power Controlled Medium Access Control Design For Cognitive Radio Ad-Hoc Network

In this work, we propose efficient channel assignment as well as transmission power control (TPC) algorithm to improve the performance of multi-channel single-radio cognitive radio ad-hoc networks (CRAHNs). The channel assignment algorithm aims to assign channels among users in a way that reduces the probability of collision. The TPC aims to tune the transmit power used by nodes. By this mechanism several goals can be achieved, which are: prolonging the battery life, reducing the interference among users, and increasing the frequency spatial reuse. The results show that an enhancement can be achieved when the proposed protocol is integrated to ad-hoc networks, which can be seen through increase in the network’s throughput performance and decrease in access delay. Here, the network simulator 2 (NS2) has been used to verify the theoretical model, which indicates a significant enhancement in network performance.