標題: Load-Balancing Spectrum Decision for Cognitive Radio Networks
作者: Wang, Li-Chun
Wang, Chung-Wei
Adachi, Fumiyuki
電機工程學系
電信工程研究所
Department of Electrical and Computer Engineering
Institute of Communications Engineering
關鍵字: Cognitive radio;spectrum decision;channel selection;overall system time;preemption;queueing theory
公開日期: 1-四月-2011
摘要: In this paper, we present an analytical framework to design system parameters for load-balancing multiuser spectrum decision schemes in cognitive radio (CR) networks. Unlike the non-load-balancing methods that multiple secondary users may contend for the same channel, the considered load-balancing schemes can distribute the traffic loads of secondary users to multiple channels. Based on the preemptive resume priority (PRP) M/G/1 queueing theory, a spectrum decision analytical model is proposed to evaluate the effects of multiple interruptions from the primary user during each link connection, the sensing errors (i.e., missed detection and false alarm) of the secondary users, and the heterogeneous channel capacity. With the objective of minimizing the overall system time of the secondary users, we derive the optimal number of candidate channels and the optimal channel selection probability for the sensing-based and the probability-based spectrum decision schemes, respectively. We find that the probability-based scheme can yield a shorter overall system time compared to the sensing-based scheme when the traffic loads of the secondary users is light, whereas the sensing-based scheme performs better in the condition of heavy traffic loads. If the secondary users can intelligently adopt the best spectrum decision scheme according to sensing time and traffic conditions, the overall system time can be improved by 50% compared to the existing methods.
URI: http://dx.doi.org/10.1109/JSAC.2011.110408
http://hdl.handle.net/11536/9086
ISSN: 0733-8716
DOI: 10.1109/JSAC.2011.110408
期刊: IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume: 29
Issue: 4
起始頁: 757
結束頁: 769
顯示於類別:期刊論文


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