Near-Field Quiet Zone Using Passive XL-RIS for 6G-IoT Coexistence in the Upper Mid-Band

Mashhadi, Shima; Hoang, Tiep M.; Vahid, Alireza

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https://hdl.handle.net/2142/130294 Copy

Description

Title

Near-Field Quiet Zone Using Passive XL-RIS for 6G-IoT Coexistence in the Upper Mid-Band

Author(s)

• Mashhadi, Shima
• Hoang, Tiep M.
• Vahid, Alireza

Issue Date

2025-09-17

Keyword(s)

• Interference cancellation
• Near-field
• XL-RIS
• 6G
• Coexistence
• FR3
• Beamforming

Abstract

The expansion of advanced applications and the high-density deployment of the Internet of Things (IoT) are driving the demand for new spectrum in sixth-generation wireless networks, especially in the upper mid-band (FR3). However, operating massive 6G-IoT networks in the FR3 introduces critical coexistence issues with incumbent passive services, such as radio astronomy. This paper investigates an interference mitigation framework based on a passive extremely large reconfigurable intelligent surface (XL-RIS) operating in the radiative near-field. Using the near-field beamforming properties, we form an electromagnetic consistent quiet zone in the Fresnel region of an XL-RIS through destructive interference alignment. We aim to minimize interference at passive receivers while ensuring quality of service for IoT devices by optimizing the RIS phase shifters. We then solve this optimization problem using an efficient iterative algorithm. Simulation results demonstrate that the proposed method can effectively suppress interference at the target location and, in contrast to a conventional far-field solution, maintains IoT device connectivity, even when the incumbent receiver lies in the direction of the BS beam.

Publisher

Allerton Conference on Communication, Control, and Computing

Series/Report Name or Number

2025 61st Allerton Conference on Communication, Control, and Computing Proceedings

ISSN

2836-4503

Type of Resource

Text

Genre of Resource

Conference Paper/Presentation

Language

eng

Handle URL

https://hdl.handle.net/2142/130294&&

Copyright and License Information

Copyright 2025 owned by the authors.

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