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arXiv · 2609.26953

RIS-Enabled Integrated Access and Relay: Empowering Collaboration Among BSs

Hao Lin·Mustafa A. Kishk·Mohamed-Slim Alouini
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Abstract

The increasing number of Internet of Things (IoT) devices and applications leads to severe access congestion in conventional base station (BS) networks. Meanwhile, the low transmit power of IoT devices requires larger diversity gains from the system design. Therefore, low-cost traffic management and signal enhancement mechanisms become essential. Reconfigurable intelligent surfaces (RISs) are increasingly significant due to their flexibility and efficiency. Using reflection, refraction, and amplification, RISs can act as innovative relay nodes to overcome spatial limitations caused by blockages, and improve the coverage range of existing infrastructure. However, more extensive applications of RISs remain to be explored. In this paper, we propose to deploy co-sited RISs on BSs and use the integrated access and relay (IAR) architecture to enable wave-domain task-offloading between BSs, without requiring extra infrastructure or incurring extra decoding latency. Considering the fixed and dynamic sub-carrier schemes, we show the performance improvement in cell-free networks and cellular networks. In addition, we investigate the effect of RIS elements allocated to each IoT device in both cell-free and cellular networks. Finally, we discuss the opportunities and challenges of IAR BSs for future communications design.

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Hao Lin, Mustafa A. Kishk, Mohamed-Slim Alouini. 2026-09-22. RIS-Enabled Integrated Access and Relay: Empowering Collaboration Among BSs. https://doi.org/10.1109/miot.2026.3673149

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