Optimizing the Placement and Beamforming of RIS in Cellular Networks: A System-Level Modeling Perspective

In this letter, we present in detail the system-level modeling of reconfigurable intelligent surface (RIS)-assisted cellular systems by considering a 3-dimensional channel model between base station, RIS, and user. We prove that the optimal placement of RIS to achieve wider coverage is exactly oppos...

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Bibliographic Details
Published in:IEEE communications letters 2023-12, Vol.27 (12), p.1-1
Main Authors: Pavan Reddy, M., Amuru, SaiDhiraj, Kuchi, Kiran Kumar
Format: Article
Language:English
Subjects:
Algorithms
Array signal processing
Base stations
Beamforming
Cellular communication
Channel models
Fading channels
Modelling
Optimization
Organizations
Phase shifters
Placement
reconfigurable intelligent surfaces (RIS)
Schedules
spectral efficiency
Three dimensional models
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Summary:In this letter, we present in detail the system-level modeling of reconfigurable intelligent surface (RIS)-assisted cellular systems by considering a 3-dimensional channel model between base station, RIS, and user. We prove that the optimal placement of RIS to achieve wider coverage is exactly opposite to the base station, under the constraint of single RIS in each sector. We propose a novel beamforming design for RIS-assisted cellular systems and derive the achievable sum rate in the presence of ideal, discrete, and random phase shifters at RIS. Through extensive system-level evaluations, we then show that the proposed beamforming design achieves significant improvements as compared to the state-of-the-art algorithms.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2023.3329135