Traffic-Adaptive Proactive Spectrum Handoff Strategy for Graded Secondary Users in Cognitive Radio Networks

• Published in: Chinese Journal of Electronics 2015-10, Vol.24 (4), p.844-851
• Main Authors: Zhang, Lei, Song, Tiecheng, Wu, Ming, Bao, Xu, Guo, Jie, Hu, Jing
• Format: Article
• Language: English
• Subjects: Admissible access region; average cumulative handoff delay minimization; Cognitive; cognitive radio; Cognitive radio network; cognitive radio networks; communication services; Cumulative handoff delay; delay requirements; delay; G; Graded secondary users; handoff; mobility management (mobile radio); multiple spectrum handoff characterization; network; Cumulative; preemptive resume priority M/G/1 queueing; queueing theory; radio; radio spectrum management; spectrum switching point; telecommunication switching; telecommunication traffic; traffic‐adaptive proactive spectrum handoff strategy
• ISSN: 1022-4653; 2075-5597
• DOI: 10.1049/cje.2015.10.030

In order to meet different delay requirements of various communication services in Cognitive radio(CR) networks, Secondary users(SUs) are divided into two classes according to the priority of accessing to spectrum in this paper. Based on the proactive spectrum handoff scheme, the Preemptive resume priority(PRP) M/G/1queueing is used to characterize multiple spectrum handoffs under two different spectrum handoff strategies. The traffic-adaptive spectrum handoff strategy is proposed for graded SUs so as to minimize the average cumulative handoff delay. Simulation results not only verify that our theoretical analysis is valid, but also show that the strategy we proposed can reduce the average cumulative handoff delay evidently. The effect of service rate on the proposed spectrum switching point and the admissible access region are provided.