Wake-Up Receiver Design for Ultra-Low Power IoT Reception

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Solution Overview

Problem

Existing wireless communication technologies face challenges in reducing power consumption during deep sleep states in devices like IoT devices, where waking up only when necessary is crucial for energy efficiency.

Innovation Solution

The proposed solution involves designing a wakeup signal system that allows a user equipment (UE) to receive configurations for allocated resources, enabling a wake-up receiver to detect a wakeup signal while the main radio is in a sleep power state, and subsequently wake up the main radio for communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the device monitors wake-up signals during deep sleep state, then the device can wake up when necessary, but the device still consumes power during monitoring

Engineering Contradiction:

Improvewake-up capabilityVSAvoidpower consumption during sleep

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The radio system is divided into two separate radios: a main radio for full communication functionality and a wake-up receiver (WUR) for monitoring wake-up signals. This segmentation allows the main radio to remain in deep sleep while the low-power WUR monitors for wake-up signals, resolving the contradiction between maintaining wake-up capability and minimizing power consumption during sleep state.

Inventive Principle:

Principle #1Segmentation

2Use of energy by moving object

If the device uses a separate wake-up receiver to detect WUS, then power consumption is reduced, but the device complexity increases

Engineering Contradiction:

Improvepower consumption during sleepVSAvoidradio system structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The wake-up signal monitoring function is extracted from the main radio system and implemented as a separate, dedicated wake-up receiver (WUR). This extraction allows the WUR to be optimized specifically for low-power wake-up signal detection without the complexity of full communication functionality, reducing overall power consumption while managing system complexity through functional separation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The wake-up receiver acts as an intermediary component between the deep-sleep main radio and the wake-up trigger mechanism. It monitors for wake-up signals and triggers the main radio to wake up only when necessary, serving as a low-power mediator that resolves the contradiction between power savings and wake-up responsiveness.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If the main radio stays in deep sleep state, then power consumption is minimized, but the device response time to wake up increases

Engineering Contradiction:

Improvepower consumption during sleepVSAvoidwake-up latency

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The wake-up receiver is kept in an active or low-power monitoring state before the main radio needs to wake up, continuously or periodically checking for wake-up signals. This preliminary monitoring action ensures that when a wake-up signal is detected, the main radio can be triggered immediately, minimizing wake-up latency while maintaining deep sleep power savings.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250142474A1System and method for wakeup signal design to facilitate ultra-low power reception

Publication Date: 2025.05.01 HUAWEI TECH CO LTD

AI summary

According to embodiments, a user equipment (UE) using a first radio of the UE receives from a base station one or more configurations. The one or more configurations indicate resources allocated to wakeup signal (WUS) transmission. The UE using a second radio of the UE detects a WUS in the resources while the first radio of the UE is in a sleep power state. The UE using the first radio performs a wakeup procedure with the base station.