%A XIAO Nan,LIANG Jun,LIU Yulei %T Channel Access Strategy Based on Dynamic MultiSpectrum Sensing in Cognitive Radio Networks %0 Journal Article %D 2016 %J Journal of Shanghai Jiao Tong University %R %P 788-795 %V 50 %N 05 %U {https://xuebao.sjtu.edu.cn/CN/abstract/article_41270.shtml} %8 2016-05-28 %X Abstract： Aimed at the low allocation efficiency of primary spectrum of channel access strategies based on fixed spectrumsensing, a novel channel access strategy based on dynamic multispectrum 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 chainbased 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.