This project therefore had two objectives:
- to develop a measurement method to assess exposure from 5G NR base stations on-site; and
- to develop a measurement methodology applicable to assess exposure for massive MIMO products.
|Measurements being undertaken on a base station with a number of different services. The small 5G antennas are located in the middle of the head of the tower.|
Measurements being undertaken on a base station with a number of different services. The small 5G antennas are located in the middle of the head of the tower. The MWF supported a research project at the University of Ghent to undertake the identified work. The results involve a five-step methodology consisting of: (1) a spectrum overview to identify the 5G NR channels; (2) the identification of the synchronization signal block (SSB) which contains the ‘always on’ signals; (3) the measurement of electric field strength per resource element of the SSB; (4) the measurement of the of the time-averaged instantaneous exposure level; and (5) the extrapolation of the resource element electric-field strength to the theoretical maximum level as well as the actual maximum level taking into account a variety of factors outlined in existing standards.
The methodology has now been presented to the International Electrotechnical Commission (IEC) standards committee overseeing work on a new standard in this area and has been published in the journal IEEE Access.
The publication details are as follows:
- In-situ Measurement Methodology for the Assessment of 5G NR Massive MIMO Base Station Exposure at Sub-6 GHz Frequencies, Aerts S, Verloock L, Van Den Bossche M, Colombi D, Martens L, Törnevik C, Joseph W, IEEE Access 2019; 7: 184658-184667