Low-Power Wake-Up Signal Design in 3GPP 5G-Advanced Release 19

TL;DR

This paper discusses the design and evaluation of low-power wake-up signals in 3GPP 5G-Advanced Release 19, emphasizing power efficiency improvements for IoT devices and potential implications for future 6G systems.

Contribution

It provides a comprehensive overview of LP-WUS procedures, physical-layer design, and receiver architectures, highlighting trade-offs between power savings and coverage.

Findings

LP-WUS enables significant power savings in 5G IoT devices.

Different receiver architectures offer trade-offs between power efficiency and coverage.

LP-WUS serves as a baseline for 6G wake-up signal design.

Abstract

The Low-Power Wake-Up Signal (LP-WUS) and Low-Power Synchronization Signal (LP-SS), introduced in 3GPP 5G-Advanced Release 19, mark an important advancement toward power-efficient IoT communications. This paper provides a comprehensive overview of the LP-WUS procedures in the RRC_IDLE and RRC_INACTIVE states and summarizes the key physical-layer design aspects. The LP-WUS is intended to be detected by a low-power energy detector (ED), allowing the main radio (MR) to remain switched off, thereby enabling substantial power savings compared to conventional 5G paging mechanisms. As such, LP-WUS is considered the baseline for 6G WUS design. Furthermore, different receiver architectures are evaluated, highlighting the inherent trade-offs between power-saving gains and coverage performance.