A modified LBT mechanism and performance enhancement for LTE-U/WiFi co-existence

Abstract

Unlicensed spectrum, unlike its licensed counterpart, has to be shared by multiple technologies and hence the performance is heavily impacted by cross-technology interference. In this paper, we focus on the co-existence mechanism design of LTE-U and WiFi in the unlicensed spectrum. We propose a modified-LBT (M-LBT) mechanism for LTE-U coexisting with WiFi in unlicensed band. Moreover, a precoding algorithm is designed to utilize spatial resource. Meanwhile, a user selection scheme can be applied to balance fairness and efficiency of LTE-U users. Simulation results demonstrate that the M-LBT mechanism can improve the total system throughput while guaranteeing fairness between LTE-U and WiFi.