Duty-Cycled Receiver Listening for Low-Power Wake-Up Detection
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Solution Overview
Problem
Existing receiver technologies in power-constrained devices incur significant power consumption and detection times when listening for wake-up frames due to the need to continuously monitor for unsynchronized transmissions, which shortens battery life.
Innovation Solution
Implementing a duty cycled receiver operation that enables the receiver for short receive fragments followed by idle states to identify fragments of wake-up frames, using modulation and spreading characteristics for detection, and optionally storing signal fragments for post-processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver continuously monitors for wake-up frames in unsynchronized CSL, then detection reliability is improved, but power consumption increases and battery life decreases
Solution Approach 1:
The receiver operates in periodic duty-cycled intervals, enabling the receiver for short receive fragments followed by idle states. This periodic operation allows the device to listen for wake-up frames at regular intervals rather than continuously, significantly reducing power consumption while maintaining detection capability through multiple sampling opportunities.
Solution Approach 2:
The continuous monitoring period is segmented into multiple short receive fragments separated by idle states. Each receive fragment is a discrete sampling interval where the receiver is enabled, followed by idle periods where the receiver is disabled. This segmentation allows the system to achieve reliable detection through cumulative probability across multiple fragments while minimizing overall power consumption.
2Measurement precision
If the receiver uses preamble detection to identify wake-up frames, then detection accuracy is improved, but receiver on time and processing time increase
Solution Approach 1:
The system extracts and analyzes specific characteristic features (modulation characteristics and spreading characteristics) from the received signal fragments to identify wake-up frames. Instead of performing full preamble detection, the receiver extracts these key identifying features which are sufficient to distinguish wake-up frames from other signals, reducing processing time and receiver on time while maintaining detection accuracy.
Solution Approach 2:
The receiver performs partial detection by analyzing only the essential characteristics (modulation and spreading) rather than complete frame validation. This partial action is sufficient for wake-up frame identification and allows the receiver to quickly determine presence/absence without committing to full reception, thereby reducing the time the receiver remains active.
3Reliability
If the receiver enables for longer duration to ensure wake-up frame capture, then detection reliability is improved, but battery life decreases
Solution Approach 1:
The system uses periodic duty-cycled listening with multiple receive fragments distributed over time. Instead of one long continuous reception, the receiver enables for short durations repeatedly at defined intervals. This periodic approach ensures that wake-up frames are captured reliably across multiple sampling opportunities while keeping each individual receiver activation brief, thereby extending battery life.
Solution Approach 2:
The receiver performs preliminary analysis of signal fragments during short receive fragments to identify potential wake-up frames before committing to full reception. By conducting preliminary detection using modulation and spreading characteristics, the system can determine whether further reception is necessary, avoiding prolonged receiver activation and preserving battery life while maintaining capture reliability.
Data Source
AI summary
In one aspect, a method includes: enabling, via a controller of a network device, a receiver of the network device for a plurality of receive fragments during a receive duration; analyzing a signal fragment received during at least one of the plurality of receive fragments to identify possible presence of a wake-up frame sent by a coordinator device; and in response to the identification of the possible presence of the wake-up frame, enabling the receiver to receive and detect another wake-up frame.