RIS (Reconfigurable Intelligent Surfaces) is an emerging wireless technology that dynamically controls radio signals to enhance system performance in 5G-Advanced and 6G networks. The ETSI GR RIS-001 report defines eleven specific use cases where RIS improves capacity, coverage, positioning, and sensing capabilities, such as detecting falls in elderly care applications. By utilizing planar surfaces with controllable unit-cells, RIS reflects signals to users without requiring high-cost active components like power amplifiers, offering a low-energy and flexible deployment solution. This passive technology allows integration onto various structures like walls and lamp posts while potentially reducing electromagnetic field exposure, positioning it as a sustainable option for future wireless infrastructure.
Keywords: reconfigurable intelligent surfaces, passive components, EMF reduction, low-cost deployment, ambient backscattering