认知无线电网络中基于信道租借的动态信道组合策略研究

hannel lease (CL) is a valid approach for achieving more flexible channel usage in cognitive radio networks (CRNs). The motivation for such a technique is to enhance the quality of service (QoS) of secondary users (SUs) while benefiting the primary users (PUs). However, in the currently existing CL schemes, they considered that one user occupied one channel. In this paper, we focus on investigating that an SU assembles multiple channels simultaneously to improve the performance of SUs and the channel usage efficiency, and SUs need not incur additional costs or affect the QoS of PUs. To this end, we propose a dynamic channel access (DCA) strategy based on CL and channel assemble (CA). We use the continuous time Markov chain (CTMC) to model the system and analyze each index of the system, including the channel utilization of the system and the capacity, blocking probability and forced termination probability for the both users. The numerical results show that compared with the scheme without CA, the dynamic CA scheme with a suitable set of lower bound and upper bound can obtain higher SU gains, also improves the performance of PUs and the channel utilization efficiency of the system.