Title: QoS-driven channel allocation schemes based on secondary users' priority in cognitive radio networks
Authors: Ahmed T. El-Toukhey; Mohsen M. Tantawy; Ibrahim F. Tarrad
Addresses: Faculty of engineering, Al-Azhar University, Cairo, Egypt ' National Telecommunication Institute, Cairo, Egypt ' Faculty of engineering, Al-Azhar University, Cairo, Egypt
Abstract: Cognitive radio networks have gained popularity as they can support quality-driven wireless services. The Quality of Service (QoS) that directly measures the satisfaction of the end users cannot be realised owing to limited spectrum resources. This paper proposes a channel allocation model to improve the QoS of the priority-based Secondary Users' (SUs) performance in terms of throughput, blocking and dropping probability. The results show that, for increasing primary users' arrival rate, throughput and the dropping probability for the highest priority SUs increase by 23.3-46.1% and 30.16-35.67%, respectively, while the blocking probability decreases 55-82.5%. For increasing the system-accepted SUs arrival rate, throughput and the dropping probability for the highest priority SUs increase by 9.1-50.6% and 27.3-61.7%, respectively, and the blocking probability decreases by 42.7-43.6%.
Keywords: cognitive radio networks; CRNs; QoS; quality of service; channel allocation; Markov chain; queuing theory; secondary users; user priority; throughput; blocking; dropping probability.
International Journal of Wireless and Mobile Computing, 2016 Vol.11 No.2, pp.91 - 99
Received: 04 Apr 2016
Accepted: 28 Sep 2016
Published online: 02 Nov 2016 *