TSDSI Standards Driven Implementation of Smart Radio Environment.

This paper presents a prototype implementation of a smart radio environment (SRE) based communication system. A reflecting plate, reconfigurable intelligent surface (RIS) is placed between the transmitter and receiver to build the SRE. The RIS can rotate to reflect the incident wave to a particular direction. The experimental model consists of a channel estimator (CE), a generic RIS controller (GRC), and a RIS-specific controller (RSC). The channel estimator is equipped with two universal software radio peripheral's (USRP's) that act as transmitter and receiver. Further, based on the desired throughput requirements, the CE sends commands to the GRC, which in turn sends commands to the RSC that controls the RIS. Since a RIS can be designed and fabricated in many ways, a Telecommunications Standards Development Society, India (TSDSI) standard is in place to list the interface/messages between the wireless system and the RIS. These standardized commands are used to exchange messages between the GRC and RSC. With this setup, the received power improvement of around 20 dBm has been achieved if RIS is deployed. Also, an algorithm at GRC finds the beamforming angle where the received power is maximized.