RWTH Aachen University
In Cognitive Radio Ad Hoc Networks (CRANs) a frequently changing environment, licensed holders channel occupancy and heterogeneous spectrum availability result in a need of on-demand searching for a control traffic channel by CR 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. In this paper, the authors evaluate a torus Quorum System (QS) and Difference Set (DS) based rendezvous protocol (MtQS-DSrdv), designed in their previous paper, but in an asymmetric channel view case (heterogeneous channel availability).