Prototype of Multi-Sector Indoor mm W Base Station Based on 5G NR Beam Control

High-frequency radio waves such as millimeter waves and terahertz waves, which are used in the 5G and beyond (Beyond 5G, 6G, etc.), have a wide bandwidth enabling high-speed and high-capacity communications. Because of their strong linearity, there are cases where radio waves are unstable in situations with many obstacles making area design difficult. In response to these characteristics, there is a trend toward large-scale arraying of base stations. However, the increase in the size of the array antenna, calibration circuits, and circuit size, as well as the increase in power consumption, will be affected by the increase in the calculation load due to larger antennas and digitalization. This has become a challenge to widespread use of millimeter-wave band base stations. To address these issues, we developed a 5G multi-sector antenna indoor base station that efficiently delivers radio waves over a wide area with a small number of base station units. Furthermore, by utilizing directivity and polarization, the spatial correlation characteristics of MIMO branches can be reduced. This improves the frequency utilization efficiency and enables more efficient use of radio waves. This paper introduces a multi-sector antenna indoor base station prototype based on 5G NR beam control and presents experimental results.