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In this paper, the authors propose a stopping rule-driven channel access scheme for a secondary user pair in multichannel Cognitive Radio Networks (CRNs), aiming to achieve a desired tradeoff between channel sensing and channel access. In the proposed approach, they first formulate the sensing-access tradeoff problem as a 1-stage look-ahead stopping problem. They, then derive two stopping conditions, namely power-limited stopping and bandwidth-limited stopping, whereby a desired tradeoff between sensing overhead and throughput increase can be achieved. Once a stopping condition is reached, a secondary user pair stops sensing and starts accessing previously sensed free channels for packet transmission.
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