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The growing demands of high-speed and stable next generation 5G cellular networks become the main stream in these years. In order to overcome a bottleneck of high-speed communication which is caused by limited spectrum resources, cognitive radio (CR) network has been proposed as a promising technology in 5G networks. However, in CR networks, primary user (PU) networks lead another novel NP-Hard routing...
As increasing number of cognitive radio network (CRN) standards are developed in TV White Spaces band with incompatible communication patterns, heterogeneous CRNs coexistence problem could not be avoided. However, most solutions on this problem have not considered CRNs’ actual data transmission demands and weighted fairness simultaneously. Therefore, we would like to introduce a novel On-demand ecological Species Competition based HEterogeneous networks coexistence MEchanism...
Last 2 decades have witnessed the spectrum resources scarcity which is caused by wireless networks’ ubiquitous applications. To utilize the rare spectrum resources more efficiently, Cognitive Radio (CR) technology has been developed as a promising scheme. However, in CR networks, a novel NP-Hard disjoint multi-path routing problem has been encountered due to the Primary Users’ (PUs’) random movements...
Multiuser collaboration can significantly improve the performance of spectrum sensing in cognitive radio networks. By admitting the noise power estimation error and fading/shadowing effects in practical implementation, this paper presents another look at the energy detection based cooperative spectrum sensing. The worst-case collective probability of miss detection due to the noise uncertainty is...
Cooperation is necessitated for tackling the challenges caused by fading/shadowing effects, noise uncertainty and sensing time constraints in spectrum sensing of cognitive radio networks. This paper studies the optimization problem of energy detection based cooperative spectrum sensing (CSS), with the main focuses on the optimality of K out of N fusion strategy and cooperative-user number. The procedures...
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