Increased Spectrum Utilisation In A Cognitive Radio Network: An M/M/1-PS Queue Approach

A channel share scheme is proposed as a solution to the resource allocation problem in cognitive radio networks whereby two secondary users can occupy the same channel simultaneously with the primary user. The solution will increase utilisation thus freeing up much needed spectrum to accommodate many more users. Processor sharing techniques have been developed but have not been extensively applied in cognitive radio networks, specifically, the weighted head of line processor sharing scheme has the potential of improving spectrum usage in networks. In this paper, we propose using transmission power as the basis for the weighting parameter. We then develop the state transition matrices for the model using continuous time Markov chains. Queues are imposed on both secondary users. The model is evaluated through simulations done on various network conditions. The results show that the proposed model offers a significant improvement over an ordinary M/M/1 two priority system. The applications can lead to improved network efficiency by allowing more users to transmit within a network.