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This paper introduces a new channel selection strategy for reliablecontentionaware data dissemination in multi-hop cognitive radio network. Thekey challenge here is to select channels providing a good tradeoff betweenconnectivity and contention. In other words, channels with good opportunitiesfor communication due to (1) low primary radio nodes (PRs) activities, and (2)limited contention of cognitive ratio nodes (CRs) acceding that channel, haveto be selected. Thus, by dynamically exploring residual resources on channelsand by monitoring the number of CRs on a particular channel, SURF allowsbuilding a connected network with limited contention where reliablecommunication can take place. Through simulations, we study the performance ofSURF when compared with three other related approaches. Simulation resultsconfirm that our approach is effective in selecting the best channels forefficient and reliable multi-hop data dissemination.

Toward Reliable Contention-aware Data Dissemination in Multi-hop Cognitive Radio Ad Hoc Networks