The effort to extend cellular technologies to unlicensed spectrum has beengaining high momentum. Listen-before-talk (LBT) is enforced in the regions suchas European Union and Japan to harmonize coexistence of cellular and incumbentsystems in unlicensed spectrum. In this paper, we study throughput optimal LBTtransmission strategy for load based equipment (LBE). We find that the optimalrule is a pure threshold policy: The LBE should stop listening and transmitonce the channel quality exceeds an optimized threshold. We also reveal theoptimal set of LBT parameters that are compliant with regulatory requirements.Our results shed light on how the regulatory LBT requirements can affect thetransmission strategies of radio equipment in unlicensed spectrum.
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