Local 5G mmWave Signal Measurement and Analysis for Spectrum Database

The concept of the smart spectrum has been proposed to deal with the problem of shortage of spectrum, which is a limited resource. In smart spectrum, a database is constructed based on the measured data of the radio environment to manage the spectrum, thus realizing highly efficient spectrum utilization, and its usefulness has been confirmed in several systems. On the other hand, for 5G NR signals, the database based on the smart spectrum has not been studied and its usefulness has not been confirmed. In particular, since 5G millimeter wave (mmWave) signals adopt beamforming technology, it is necessary to estimate the directivity and propagation characteristics of multiple beams. Therefore, in the database construction, we need to measure and manage not only the conventional management for each base station and frequency but also each beam. In this paper, we conduct a measurement campaign of mmWave signals from a local 5G base station in Imabari City, Ehime Prefecture, Japan, and construct a spectrum database. We also discuss the analysis results of mmWave signals based on the constructed database, including the radio propagation of each beam and the comparison with anchor band signals. and confirm the usefulness.