To meet the high demand for mobile data, the Third Generation Partnership Project (3GPP) established a set of standards known as 5G New Radio (5G NR). The architecture of 5G NR includes a flexible radio access network and a core network. 3GPP has also been working on a new radio access technology, called 5G NR Unlicensed (5G NR-U), which aims at extending 5G NR to unlicensed bands. In this article, we give an overview of the most recent 5G NR-U design elements and discuss potential concerns, including fair coexistence with other unlicensed technologies such as Wi-Fi. We use simulations to study coexistence between Wi-Fi and 5G NR-U systems. Our evaluation indicates that NR-U often achieves higher throughput and lower delay than Wi-Fi (802.11ac). The two systems experience different buffer occupancies and spectrum utilization statistics. We also discuss the improvements that NR-U offers over LTE Licensed Assisted Access (LTE-LAA).

中文翻译：

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5G 新无线电免授权：挑战与评估


为了满足对移动数据的高需求，第三代合作伙伴计划 (3GPP) 制定了一套称为 5G 新无线电 (5G NR) 的标准。 5G NR的架构包括灵活的无线接入网和核心网。 3GPP 还一直致力于开发一种名为 5G NR Unlicensed (5G NR-U) 的新无线接入技术，旨在将 5G NR 扩展到免许可频段。在本文中，我们概述了最新的 5G NR-U 设计元素，并讨论了潜在的问题，包括与 Wi-Fi 等其他免许可技术的公平共存。我们使用模拟来研究 Wi-Fi 和 5G NR-U 系统之间的共存。我们的评估表明，NR-U 通常比 Wi-Fi (802.11ac) 实现更高的吞吐量和更低的延迟。这两个系统具有不同的缓冲区占用率和频谱利用率统计数据。我们还讨论了 NR-U 相对 LTE 许可辅助接入 (LTE-LAA) 的改进。