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This paper proposes an analytical model to evaluate the performance of the listen before talk (LBT) based coexistence scheme in the scenario with multiple LTE small bases (SBSs) over the unlicensed spectrum. Based on the proposed model, we further derive the expressions of the occupancy time of the LTE/Wi-Fi/access overhead and the collision probability. It is shown from numerical results that the LBT-based coexistence scheme is not fair enough for the Wi-Fi system in the coexistence scenario with multiple LTE SBSs, and thus the number of LTE SBSs and the length of the LTE frame should be carefully designed to protect the Wi-Fi system.

Performance Analysis of Listen Before Talk Based Coexistence Scheme Over the Unlicensed Spectrum in the Scenario With Multiple LTE Small Bases