Review on Resource Allocation Mechanisms in Cognitive Radio

This paper focuses on the allocation of channel resources in cognitive radio system. Here, Cognitive (RRM) technology is envisaged to solve the problems in wireless networks resulting from the limited available spectrum. RRM developmental growth is high in advanced generations .Moreover, this paper focus on proposing an improved version of the recently introduced optimization algorithm called as GSO to solve the resource allocation problem more effectively. Furthermore, review of radio resource management efforts reported in the literature, the primary contributions reside on optimizing the resource utilization and allocation principles. Hence, the review outcomes are summarized in Table I in the perspective of optimization problem. In research gaps, distributed allocation, Topology discovery, Spectrum access and coordination, evolutionary and learning have been discussed. This paper also discusses the system model of Resource Allocation for OFDMBased Cognitive Radio Networks.