Journal of Shanghai Jiaotong University ›› 2016, Vol. 50 ›› Issue (05): 788-795.

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Channel Access Strategy Based on Dynamic MultiSpectrum Sensing in Cognitive Radio Networks

XIAO Nan,LIANG Jun,LIU Yulei   

  1. (Information and Navigation College, Air Force Engineering University, Xi'an 710077, China)
  • Received:2015-06-29 Online:2016-05-28 Published:2016-05-28

Abstract: Abstract: Aimed at the low allocation efficiency of primary spectrum of channel access strategies based on fixed spectrumsensing, a novel channel access strategy based on dynamic multispectrum sensing was proposed for cognitive radio network. The cognitive radio base station could adjust the number of sensing channels allocated to secondary users according to their access request priority and discover the probability of idle spectrum in a single time slot. The optimized number of sensing spectrums allocated to secondary user was analyzed. As the proposed strategy is formulated as a channel selection problem coupled with a channel assignment problem, the myopic sensing policy was subsequently investigated and a Markov chainbased dynamic channel assignment algorithm was proposed. The results of simulation indicate that the proposed channel access strategy has achieved significant performance improvements in network throughput compared to the existing strategies, and the average channel access delay of secondary users has been declined while the fairness of channel access is better.

Key words: Key words: cognitive radio, dynamic allocation, spectrum sensing, channel access, throughtput

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