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The authors address the problem of rapidly discovering spectrum opportunities for seamless service provisioning for Secondary Users (SUs) in Cognitive Radio Networks (CRNs). Specifically, they propose an efficient sensing-sequence that incurs a small opportunity-discovery delay by considering the probability that a spectrum band (or a channel) may be available at the time of sensing, the duration of sensing on a channel, and the channel capacity. They derive the optimal sensing-sequence for channels with homogeneous capacities, and a suboptimal sequence for channels with heterogeneous capacities for which the problem of finding the optimal sensing-sequence is shown to be NP-hard. To support the proposed sensing-sequence, they also propose a channel-management strategy that optimally selects and updates the list of backup channels.
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