Efficient Codebook Design and User Scheduling for Large STAR-RIS-Aided Downlink URLLC Transmission

Darabi M, Khalili A, Lampe L, Schober R (2025)

Publication Language: English

Publication Type: Journal article

Publication year: 2025

Journal

IEEE Communications Letters Institute of Electrical and Electronics Engineers (IEEE)

Book Volume: 29

Pages Range: 205-209

Journal Issue: 1

DOI: 10.1109/LCOMM.2024.3510464

Abstract

To ensure ultra-reliable, low-latency communications (URLLC) despite blockages, we propose using simultaneously transmitting and reflecting (STAR) reconfigurable intelligent surfaces (RISs). These surfaces can transmit and reflect signals, expanding coverage on both sides of the RIS. However, phase shifter adjustments in STAR-RIS are limited by coupling constraints. We introduce a codebook design for phase-shift adjustment that accounts for these constraints. Leveraging this design, we jointly optimize base station beamforming and STAR-RIS phase-shifting to maximize the number of admitted URLLC users in a downlink multi-user communication system. Numerical results show that the proposed STAR-RIS codebook surpasses existing designs and effectively admits more URLLC users.

Authors with CRIS profile

Ataollah Khalilimahmoudabadi Lehrstuhl für Digitale Übertragung (IDC) Robert Schober Lehrstuhl für Digitale Übertragung (IDC)

Involved external institutions

University of British Columbia

Canada (CA)

How to cite

APA:

Darabi, M., Khalili, A., Lampe, L., & Schober, R. (2025). Efficient Codebook Design and User Scheduling for Large STAR-RIS-Aided Downlink URLLC Transmission. IEEE Communications Letters, 29(1), 205-209. https://doi.org/10.1109/LCOMM.2024.3510464

MLA:

Darabi, Mostafa, et al. "Efficient Codebook Design and User Scheduling for Large STAR-RIS-Aided Downlink URLLC Transmission." IEEE Communications Letters 29.1 (2025): 205-209.

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