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A DTN Stack for Cognitive Radio Networks

In this paper, we evaluate over a software defined radio testbed the performance of a DTN implementation in cognitive radio networks. Our experimental platform uses USRP devices operated by the GNU radio platform for physical and MAC layers operations. Over the deployed software archietcture, we have compared 2 existing DTN implementations then run a set of expirements in order to chatacterize the reaction of the DTN bundle protocol to dynamically frequency changing environment. Our experiments show that DTN can offer lower delivery delays in cognitive radio networks. This improvement can reach 35% over highly dynamic spectrum bands.