Stepped Wake-Up Sequence for Remote Sensor Interfaces
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Solution Overview
Problem
Existing wake-up sequences for remote sensor interfaces (RSIs) do not adequately reduce power consumption and fail to allow for different functions to be triggered at various power levels, especially in noisy radio frequency environments.
Innovation Solution
A stepped wake-up sequence is implemented, where a second receiver screens radio frequency broadcasts for multiple criteria, drawing different electric currents based on specific conditions, such as frequency and modulation type, to efficiently power up the two-way wireless communication component, thereby reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a wake-up receiver is used to reduce power consumption, then battery life is extended, but the receiver cannot adequately distinguish signals in noisy RF environments
Solution Approach 1:
The wake-up receiver is divided into multiple functional stages: a first receiver that detects RF signals and a second receiver that analyzes signal characteristics. This segmentation allows the system to process signals in stages, maintaining low power consumption while improving detection accuracy through hierarchical processing.
Solution Approach 2:
The first receiver performs preliminary signal detection and the second receiver performs preliminary analysis of signal characteristics before full processing. This preliminary action filters out noise early in the process, preventing unnecessary power consumption in later processing stages while ensuring reliable signal identification.
2Reliability
If the two-way wireless communication component is always on, then communication reliability is improved, but power consumption increases
Solution Approach 1:
The wake-up receiver performs preliminary detection of wake-up signals before activating the two-way wireless communication component. This preliminary action ensures that the communication component is only activated when necessary, maintaining communication reliability while minimizing power consumption during idle periods.
Solution Approach 2:
The system uses feedback from the wake-up receiver to control the power state of the two-way wireless communication component. The wake-up receiver continuously monitors for wake-up signals and provides feedback to the communication component's power control circuit, enabling dynamic power management that balances reliability and energy efficiency.
3Device complexity
If a simple wake-up sequence is used, then device complexity is reduced, but different functions cannot be triggered at different power levels
Solution Approach 1:
The wake-up sequence is segmented into multiple receivers that can be activated at different power levels. The first receiver operates at lower power for basic signal detection, while the second receiver operates at higher power for detailed signal analysis and function triggering. This segmentation enables flexible function activation without requiring a completely complex system always on.
Data Source
AI summary
A transceiver includes a two-way communication component capable of powering down to conserve energy and capable of powering up in response to an electronic signal, the two-way communication component including a transmitter and a first receiver; and a second receiver that is configured to screen a radio frequency broadcast and provide the electronic signal to the two-way communication component in order to power up the two-way wireless communication component. The second receiver is configured to screen the radio frequency broadcast for first criteria, and screen the radio frequency broadcast for second criteria. The electric current may be an order of magnitude larger when screening for the first criteria than the second criteria. Screening also may be performed for third criteria, namely, specific data. The second receiver is adapted to draw substantially less current while awaiting receipt of and listening for a radio frequency broadcast than the two-way wireless communication component.