LP-WUR Wake-Up Signaling With Reference-Aided Bit Decoding

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Solution Overview

Problem

Existing wireless communication technologies face challenges in efficiently supporting higher order modulation for low-power wake-up receivers (LP-WURs) required for data rates of 100 kbps, necessitating resource-efficient signaling designs.

Innovation Solution

A method for LP-WURs that involves configuring frequency resources for LP-WUS transmission, determining reference signals, and decoding bits based on signal levels, utilizing envelope detection and different power states to optimize resource usage and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If higher order modulation is used to achieve 100 kbps data rate, then data rate is improved, but power consumption and resource overhead increase

Engineering Contradiction:

Improvedata rateVSAvoidpower consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The frequency resources are divided into multiple subsets, with each subset carrying a specific bit. Reference signals are separated from data-bearing resources, allowing the LP-WUR to efficiently decode bits using envelope detection without requiring complex higher order modulation processing, thus reducing power consumption while maintaining 100 kbps data rate capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Reference signals act as intermediaries to enable the LP-WUR to accurately determine signal levels and decode bits. These reference signals provide a baseline for envelope detection, allowing the receiver to distinguish between different modulation states without requiring complex processing, thereby reducing power consumption while achieving high data rates

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If higher order modulation is used to achieve 100 kbps data rate, then data rate is improved, but signaling resource overhead increases

Engineering Contradiction:

Improvedata rateVSAvoidsignaling resource overhead

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Frequency resources are segmented into dedicated subsets for data transmission and separate subsets for reference signals. This segmentation allows efficient bit mapping where each frequency subset corresponds to a specific bit, reducing the overhead associated with higher order modulation while maintaining 100 kbps data rate capability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reference signals serve multiple functions: they provide a baseline for envelope detection, enable accurate bit decoding, and can be used for channel estimation. This multi-functionality reduces the need for additional signaling resources, thereby reducing overhead while supporting higher data rates

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Use of energy by moving object

If envelope detection is used for LP-WUR, then power consumption is reduced, but modulation scheme flexibility is limited

Engineering Contradiction:

Improvepower consumptionVSAvoidmodulation scheme flexibility

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The system uses parameter changes in the frequency domain by allocating different frequency subsets to different bits and using reference signals at specific frequencies. This allows envelope detection to be used while supporting higher order modulation, as the parameter changes in frequency allocation enable the LP-WUR to distinguish between different modulation states without requiring complex processing, thus reducing power consumption while maintaining flexibility

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables efficient support of higher order modulation for LP-WURs, reducing power consumption and resource overhead while maintaining effective communication.

Implementation Method 1

passing one or more signals through an envelope detector prior to determining one or more signal levels according to the one or more signals

Methodology Applied

Scientific EffectEnvelope detection:

Data Source

PatentUS20260040224A1Methods and apparatus for resource efficient signaling to LP-wur

Publication Date: 2026.02.05 HUAWEI TECH CO LTD

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a method implemented in a wireless device includes receiving a low-power wake-up signal (LP-WUS) configuration from a network side device indicating a set of frequency resources allocated for LP-WUS transmission. The method also includes determining one or more subsets of the set of frequency resources to be allocated to one or more bits associated with the LP-WUS transmission according to the LP-WUS configuration and determining a first reference signal and a second reference signal according to the LP-WUS configuration. The method also includes receiving one or more signals over the set of frequency resources from the network side device, determining one or more signal levels according to the one or more signals and determining the one or more bits according to the one or more signal levels, the first reference signal, and the second reference signal.