Paper Infomation
Optimal Spectrum Management with Dynamic Service and Cost Constraints in Multihop CR NetworksOptimal Spectrum Management with Dynamic Service and Cost Constraints in Multihop CR Networks
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Author: QiuRan Li, Pengbo Si, Ruizhe Yang, Yanhua Zhang
Abstract: To cope with the challenging issue that spectrum bands for wireless communications are almost used up, cognitive radio (CR) technologies have been proposed, allowing the secondary users (SUs) to harvest and utilize the spectrum bands that are licensed to primary users (PUs) but not utilized currently. Besides, the multihop cognitive radio network architecture is also introduced to efficiently utilize the harvested spectrum bands by adopting the fixed-location relay stations (RSs). In this paper, we investigate the spectrum management problem to schedule the harvested spectrum bands to the transmission links between the RSs in multihop cognitive radio networks (CRNs). As spectrum trading is considered, the CR network optimally selects the available spectrum bands according to their dynamic service requirements and renting prices. To solve this NP-hard optimization problem, two heuristic algorithms are also proposed to obtain approximate results while reducing the computational complexity. Extensive simulation results demonstrate the performance improvement of the proposed scheme.
Keywords: cognitive radio, relay stations, spectrum management
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