Abstract
In the unlicensed spectrum of 5GHz, Listen-Before-Talk (LBT) technology is used to ensure the fair and friendly coexistence of NR-U (New Radio Unlicensed) and WiFi. However, when signals are transmitted in the mmWave band, the propagation distance is short. Thus, the beamforming technology is used to form a directional narrow beam with high antenna gain, which changes the interference layout, resulting in the limited range of LBT. In this case, to better evaluate the potential interference, the receiver utilizes the useful information received through beam transmission to better manage the interference in the unlicensed mmWave spectrum, which is called receiver-assisted LBT. The performance of the system based on receiver-assisted LBT will be significantly affected by the Energy Detection (ED) threshold of the receiver. Therefore, this paper aims to find the optimal ED threshold of the receiver. We propose the inner approximation algorithm, which can improve the spectral efficiency and the system throughput when multi Radio Access Technologies (RATs) work in the unlicensed mmWave spectrum. The simulation results show the effectiveness of the method.
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