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Due to the high demand of spectrum utilization, cognitive radio (CR) network has been a promising solution to the problem of spectrum scarcity by using dynamic spectrum access technique. The CR networks is applied to the original network (or primary network) without modifying the original network. In this paper, we studied one of the CR network architectures, CR network access architecture, where the CR base stations (CRBSs) demand spectrum resources from the primary network and distribute themdoi:10.1109/pimrc.2013.6666662 dblp:conf/pimrc/LinTH13 fatcat:xsum4obu45gfbguyecbroz4gmm