  One of the trends that is gaining more and more importance in the field of
beyond-5G and 6G wireless communication systems is the investigation on systems
that jointly perform communication and sensing of the environment. This paper
proposes to use a base station (BS), that we call \textit{radar-BS}, equipped
with a large-scale antenna array to execute, using the same frequency range,
communication with mobile users and sensing/surveillance of the surrounding
environment through radar scanning. The massive antenna array can indeed both
operate as a MIMO radar with co-located antennas -- transmitting radar signals
pointing at positive elevation angles -- and perform signal-space beamforming
to communicate with users mainly based on the ground. Our results show that
using a massive MIMO radar-BS the communication and the radar system can
coexist with little mutual interference.
