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In Cognitive Radio Ad Hoc Networks (CRANs) a frequently changing environment and Primary Users channel occupancy result in a need of the searching for a common control channel by Secondary Users in order to be able to initiate a communication. A RenDezvous (RDV) is therefore a new challenge, not encountered in single channel networks. Hence, methods guaranteeing that all nodes meet periodically in reasonable periods of time should be advocated, i.e., instead of using pseudo-random solutions, systematic approaches should be considered, e.g., Quorum Systems (QSs) popular especially in power saving protocols.
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