Short Paper: On Optimal Sensing and Transmission Strategies for Dynamic Spectrum Access

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Executive Summary

The Listen-Before-Talk (LBT) strategy has been prevalent in cognitive radio networks where secondary users opportunistically access under-utilized primary band. To minimize the amount of disruption from secondary users to primary signals, secondary users generally are required to detect the presence of the primary user reliably, and access the spectrum intelligently. The sensing time has to be long enough to achieve desirable detection performance. Weaker primary signals require longer sensing time, thereby reduce the secondary transmission opportunities. In this paper, the authors generalize the packet-level LBT strategy by allowing the secondary user to potentially transmit multiple packets after one sensing, and study the optimal control policy to determine the conditions under which the secondary user should sense the channel.

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