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In this paper, we present a low overhead beam management approach fornear-field millimeter-wave multi-antenna communication systems enabled byReconfigurable Intelligent Surfaces (RISs). We devise a novel variable-widthhierarchical phaseshift codebook suitable for both the near- and far-field ofthe RIS, and present a fast alignment algorithm for the RIS phase shifts andthe transceiver beamformers. Indicative performance evaluation results areshown, verifying the effectiveness of the proposed approach in comparison withvarious benchmark schemes.

Near-Field Hierarchical Beam Management for RIS-Enabled Millimeter Wave Multi-Antenna Systems