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Research works in cognitive radio networks mainly focus on spectrum sharing and sensing, and scheduling for single and multi-hop communication systems. Routing is an important issue in multi-hop cognitive radio networks and is responsible for the performance of a network under different network conditions. Recent advances have led to many protocols designed specifically for CRNs where different approaches are used. In this paper we present a review of various routing protocols for CRNs like CogLEACH, SEARCH, etc.
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Negi et al. (2017) studied this question.
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