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In Cognitive Radio Networks (CRNs), effective and efficient channel exploitation is imperative for unlicensed secondary users to seize available network resources and improve resource utilization. In this paper, the authors propose a simple channel sensing order for secondary users in multi-channel CRNs without a priori knowledge of primary user activities. By sensing the channels according to the descending order of their achievable rates with optimal stopping, they show that the proposed channel exploitation approach is efficient yet effective in elevating throughput and resource utilization. Simulation results show that their proposed channel exploitation approach outperforms its counterparts by up to 18% in a single-secondary user pair scenario.
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