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This paper deals with the routing in cognitive mobile ad hoc networks. The authors propose to modify the widely adopted Ad-hoc On-demand Distance Vector (AODV) protocol in order to assure its functionality in the considered scenario. The resulting protocol, referred to as the Cognitive Ad-hoc On-demand Distance Vector (CAODV) protocol, has been designed according to three guidelines: to avoid regions of primary users activity during both route formation and packet discovery without requiring a dedicated common control channel; to perform a joint path and channel selection at each forwarder to minimize the route cost; to take advantage of the availability of multiple channels to improve the overall performances.
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