Allocation and access mechanisms for spectrum sharing in CRNs - a brief review

Radio spectrum perceives the need for a new paradigm considering its ineffectual use. With such an incentive, Cognitive Radio (CR) paved its way to exploit unused frequency bands in an opportunistic fashion. CR extends different functionalities for its dynamic behavior amongst which spectrum sharing holds a significant place. This paper reviews the state-of-art proposals on the subject of spectrum sharing in CRN and presents an overview on the attributes of allocation and access mechanisms. Finally, it highlights some of the challenging issues for future research in this area.