Enhancing the energy efficiency of devices stands as one of the key requirements in the fifth-generation (5G) cellular network and its evolutions toward the next generation wireless technology. Specifically, for battery-limited Internet-of-Things (IoT) devices where downlink monitoring significantly contributes to energy consumption, efficient solutions are required for power saving while addressing performance tradeoffs. In this regard, the use of a low-power wake-up receiver (WUR) and wake-up signal (WUS) is an attractive solution for reducing the energy consumption of devices without compromising the downlink latency. This paper provides an overview of the standardization study on the design of low-power WUR and WUS within Release 18 of the third-generation partnership project (3GPP). We describe design principles, receiver architectures, waveform characteristics, and device procedures upon detection of WUS. In addition, we provide representative results to show the performance of the WUR in terms of power saving, coverage, and network overhead along with highlighting design tradeoffs.

翻译：提升设备能效是第五代蜂窝网络及其向下一代无线技术演进的核心需求之一。针对下行链路监听能耗占比突出的电池受限型物联网设备，需在节能与性能权衡间提出高效解决方案。采用低功耗唤醒接收机和唤醒信号可在不牺牲下行链路时延的前提下有效降低设备能耗。本文概述了第三代合作伙伴计划第18版本中关于低功耗唤醒接收机和唤醒信号设计的标准化研究，详细阐述了设计原理、接收机架构、波形特性及检测到唤醒信号后的设备流程。此外，通过代表性性能评估结果，展示了唤醒接收机在功耗节省、覆盖能力及网络开销方面的表现，并揭示了关键设计权衡。