@inproceedings{545553d72e2b4564ab3db0365ee5b3d3,
title = "A Random Access Protocol for RIS-Aided Wireless Communications",
abstract = "Reconfigurable intelligent surfaces (RISs) are arrays of passive elements that can control the reflection of the incident electromagnetic waves. While RISs are particularly useful to avoid blockages, the protocol aspects for their implementation have been largely overlooked. In this paper, we devise a random access protocol for a RIS-assisted wireless communication setting. Rather than tailoring RIS reflections to meet the positions of users{\textquoteright} equipment (UEs), our protocol relies on a finite set of RIS configurations designed to cover the area of interest. The protocol is comprised of a downlink training phase followed by an uplink access phase. During these phases, a base station (BS) controls the RIS to sweep through its configurations. The UEs then receive training signals to measure their channel quality for the different RIS configurations and refine their access policies. Numerical results show that our protocol increases the average number of successful access attempts; however, at the expense of increased access delay due to the realization of a training period. Promising results are further observed in scenarios with a high access load.",
keywords = "Training, Wireless communication, Access protocols, Reconfigurable intelligent surfaces, Signal processing, Throughput, Reflection, Reconfigurable intelligent surface (RIS), random access",
author = "Victor Croisfelt and Fabio Saggese and Israel Leyva-Mayorga and Radoslaw Kotaba and Gabriele Gradoni and Petar Popovski",
year = "2022",
month = jul,
day = "6",
doi = "10.1109/SPAWC51304.2022.9833984",
language = "English",
isbn = "978-1-6654-9456-4",
series = "IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)",
publisher = "IEEE Communications Society",
pages = "1--5",
booktitle = "2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC)",
address = "United States",
note = "2022 IEEE 23rd International Workshop on Signal Processing Advances in Wireless Communication (SPAWC) ; Conference date: 04-07-2022 Through 06-07-2022",
}