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

IF 3.7 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2024-12-02 DOI:10.1109/LCOMM.2024.3510464

Mostafa Darabi;Ata Khalili;Lutz Lampe;Robert Schober

引用次数: 0

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.

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大型star - ris辅助下行URLLC传输的高效码本设计与用户调度

为了确保在阻塞情况下的超可靠、低延迟通信（URLLC），我们建议使用同时传输和反射（STAR）可重构智能表面（RISs）。这些表面可以传输和反射信号，扩大RIS两侧的覆盖范围。然而，STAR-RIS中的移相器调整受到耦合约束的限制。我们介绍了一种用于相移调整的码本设计，该设计考虑了这些约束。利用这种设计，我们共同优化了基站波束形成和STAR-RIS相移，以最大限度地增加下行链路多用户通信系统中允许的URLLC用户数量。数值结果表明，所提出的STAR-RIS码本优于现有的设计，能够有效地接纳更多的URLLC用户。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.