Code-Modulated Preambles for Low-Power False Wake-Up Control
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Solution Overview
Problem
Existing wireless communication systems experience high false wake-up rates and power consumption, particularly in low-power devices like fire control products, leading to potential safety hazards due to warning and alarm failures.
Innovation Solution
A method involving a code-modulated preamble detection, random factor scrambling, and group number information addition, combined with a TDMA periodic cycle mode, to reduce false wake-ups and power consumption by optimizing the wake-up process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDMA time recurrent network or active periodic reporting mode is used for wake-up function, then the device can periodically listen for wake-up signals, but the false wake-up probability increases and power consumption increases
Solution Approach 1:
The wake-up process is divided into multiple stages: first detecting a wake-up signal, then verifying with a wake-up packet, and finally confirming with communication information. This segmented approach allows the device to spend minimal time in active state for each stage, reducing overall power consumption while maintaining reliable wake-up detection
Solution Approach 2:
The device uses periodic listening windows instead of continuous monitoring. By opening receipt windows only at specific periodic intervals and keeping them closed otherwise, the device significantly reduces power consumption while still being able to detect wake-up signals reliably
2Ease of operation
If traditional wake-up mechanism is used, then the device can respond to wake-up signals, but the false wake-up rate is high leading to safety hazards
Solution Approach 1:
A wake-up packet serves as an intermediary verification step between detecting the wake-up signal and fully activating the device. The packet contains group number information that must match the device's identifier, providing an additional layer of verification that prevents false wake-ups while maintaining rapid response to valid signals
Solution Approach 2:
The patent applies different verification criteria at different stages of the wake-up process. The first receipt window uses preamble detection with specific modulation characteristics, the second window uses group number matching, and the third window uses communication information validation. This localized quality control at each stage ensures high reliability while maintaining responsiveness
Data Source
AI summary
The present disclosure provides a method for reducing false wake-up power consumption of a device. The method includes: opening a first receipt time window, and detecting whether a preamble exists in the air, the preamble being a code-modulated preamble; if no preamble is detected in the air, controlling the device to go to sleep; if the preamble is detected in the air, controlling the device to open a second receipt time window and receive a wake-up packet; detecting whether the wake-up packet meets a preset condition; if the wake-up packet does not meet the preset condition, controlling the device to go to sleep; and if the wake-up packet meets the preset condition, controlling the device to open a third receipt time window, receive communication information, process the communication information, and go to sleep after communication information processing is completed. In the present disclosure, by adopting a code-modulated preamble, the probability of false wake-up of the device can be effectively reduced, and the false wake-up power consumption of the device can be reduced; by setting a wake-up packet, the probability of false wake-up of the device can be further reduced, and the false wake-up power consumption of the device can be further reduced.