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

作　　者：ZHANG Lei SONG Tiecheng WU Ming BAO Xu GUO Jie HU Jing 

机构地区：[1]National Mobile Communications Research Laboratory, Southeast University [2]School of Computer Science and Communication Engineering, Jiangsu University

出　　处：《Chinese Journal of Electronics》2015年第4期844-851,共8页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61271207,No.61372104);Program Sponsored for Scientific Innovation Research of College Graduate in Jiangsu Province(No.CXZZ13-0100);the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.12KJB510002);Natural Science Foundation of Jiangsu Province(No.BK20130530)

摘　　要：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.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.

关 键 词：Cognitive radio network CUMULATIVE HANDOFF delay G 

分 类 号：TN925[电子电信—通信与信息系统]