NTT and NTT DOCOMO recently announced what they believe to be the world’s first use of a 28-GHz-band 5G base station and a reconfigurable intelligent surface (RIS) metasurface reflector that dynamically redirects radio waves to follow mobile devices as they move in indoor environments for improved indoor communication.
The RIS is equipped with a user-tracking function to deliver radio waves even in places where the base station antenna is not directly visible due to obstructing objects. The technology is expected to expand the use of high-frequency radio bands in places such as factories and offices.
