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With the idea to use the spectrum band efficiently, much of the research is being published in the field of cognitive radio network to share the licensed spectrum band with unlicensed users when licensed users are not active. Cognitive Radio Network (CRN) has introduced a lot of new challenges in the field of wireless networks. In this research paper, the authors had listed the cognitive radio network issues by conducting a survey of MAC protocols for CRNs. They have also developed a very simple MAC protocol for learning CRN for the entry level researcher.
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