Priority-Based Scheduling for Cognitive Radio Systems
Rolla Hassan, Fadel F. Digham, Mohamed Essam Khedr, Hazem E. Hassan · 2012
Abstract. Cognitive radio is becoming one of the most important technologies improving the utilization of the limited radio resources, the major bottle neck of the development of the next generation radio systems. In this paper, an adaptive downlink scheduling for real time and non-real time applications with the consideration of the primary user activity is proposed. The proposed algorithm satisfies different traffic models based on the QoS level of each traffic type and the spectrum availability and aiming to design an efficient scheduling algorithm to ensure an interference-free environment for the primary users. Furthermore the objective of this paper is to design an efficient scheduling algorithm to achieve a good tradeoff between system throughput, delay and fairness while accounting for the primary users ’ activities. The performance of the proposed algorithm has yield almost a 10 % relative throughput gain compared to existing schemes while maintaining the same waiting time values.