Wake-Up Receiver Sequence Hopping for Low-Power Signal Detection

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Solution Overview

Problem

Existing communication systems face challenges in achieving efficient power management and reducing interference in low-power wireless communication, particularly in 5G NR systems, where devices like IoT sensors and wearables require substantial power savings and low-latency operations.

Innovation Solution

Implementing a low-power signal transmission and reception mechanism using a low-power wake-up receiver (LP-WUR) with OOK-based signals, allowing UEs to monitor specific occasions and determine sequence changes at defined intervals, reducing unnecessary power consumption and interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If continuous monitoring is performed to ensure reliable signal reception, then measurement precision is improved, but power consumption increases

Engineering Contradiction:

Improvesignal detection accuracyVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic monitoring of low-power signals at specific occasions rather than continuous monitoring. The UE determines a sequence for each occasion that changes at a hopping interval, and only monitors at these periodic intervals. This periodic action maintains measurement precision by regularly detecting signals while significantly reducing power consumption compared to continuous monitoring.

Inventive Principle:

Principle #19Periodic action

2Use of energy by moving object

If low-power signals are transmitted to save energy, then power consumption is reduced, but signal interference increases

Engineering Contradiction:

Improvepower consumptionVSAvoidsignal interference

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies dynamics by making the signal characteristics change over time through sequence hopping. The sequence used for low-power signal transmission changes at each occasion according to a hopping interval, creating dynamic signal patterns. This dynamic approach reduces interference by varying the signal characteristics, preventing persistent interference patterns while maintaining low power consumption.

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If sequence hopping interval is shortened to improve adaptability, then system adaptability is improved, but device complexity increases

Engineering Contradiction:

Improvesignal adaptation capabilityVSAvoidprocessing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the monitoring process into discrete occasions with sequence hopping at defined intervals. Instead of continuous complex processing, the UE determines a sequence for each occasion independently based on the hopping interval. This segmentation approach improves adaptability by allowing flexible interval configuration while reducing device complexity through discrete, manageable processing steps rather than continuous complex algorithms.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4683397A1User equipment, network node, and methods for a user equipment and a network node

Publication Date: 2026.01.21 PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

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AI summary

A user equipment, UE, comprising a transceiver, which, in operation, monitors a plurality of occasions for reception of a low-power signal indicating at least one sequence; and circuitry, which, in operation, determines the at least one sequence for each of the occasions, which changes at a hopping interval, wherein the transceiver, in operation, receives, on one of the plurality of occasions, the low-power signal according to the respective determined at least one sequence.