Frequency-Based Wake-Up Device for Wireless Sensor Networks
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Solution Overview
Problem
Existing wireless sensor networks face challenges in minimizing power consumption for remote activation of sensor communication devices, as conventional wake-up methods require continuous operation of the wake-up device and consume significant power by converting entire RF signals to digital.
Innovation Solution
A frequency-based wake-up device that uses an RF signal to voltage converter to generate driving voltage, a decoder to extract ID information, and a signal processor to compare and activate sensor communication devices, reducing power consumption by selectively decoding only the necessary signals and self-generating power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wake-up device continuously operates to receive and analyze wake-up signals, then the sensor communication device can be reliably activated, but the wake-up device consumes additional power
Solution Approach 1:
The sensor communication device alternates between sleep mode and active mode periodically. During sleep mode, minimal power is consumed while the device remains dormant. When a wake-up signal is detected, the device activates temporarily to perform sensing and communication, then returns to sleep mode, creating a periodic operation cycle that reduces overall power consumption while maintaining activation reliability
Solution Approach 2:
The sensor communication device activates itself in response to wake-up signals without requiring continuous operation of external wake-up devices. The device uses its own receiver and processor to detect wake-up signals and trigger activation, eliminating the need for continuously powered separate wake-up devices and reducing overall system power consumption
2Measurement precision
If the entire received RF signal is converted to digital to determine wake-up signals, then accurate signal detection is achieved, but a large amount of power is consumed
Solution Approach 1:
The system extracts only the essential wake-up signal components from the complete RF signal for processing. Instead of converting and processing the entire RF signal digitally, the receiver selectively identifies and processes only the wake-up signal portion, significantly reducing the computational load and power consumption while maintaining accurate wake-up signal detection
Solution Approach 2:
The system performs partial digital conversion by converting only the necessary portions of the RF signal to digital format for wake-up signal detection, rather than converting the entire signal. This partial action approach achieves sufficient detection accuracy while consuming significantly less power than complete signal conversion
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution minimizes power consumption by converting wireless signals to voltage, reducing power usage and enabling detailed control of sensor activation states, including wake-up mode operations, without additional power consumption.
Implementation Method 1
an RF signal to voltage converter for receiving a wireless signal including a first signal and a second signal and performing a frequency-voltage conversion of the preamble to generate and provide a driving voltage
Data Source
AI summary
The present description relates to a frequency-based wake-up device and a sensor communication device using such the same. The present invention comprises: a RF signal to voltage converter for receiving a wireless signal including a first signal and a second signal and converting the frequency of the preamble to voltage to generate a driving voltage and provide the same; a decoder activated by the driving voltage and extracts ID information of the sensor communication device by decoding the second signal; and a signal processor that is activated by the driving voltage and compares the extracted ID information of the sensor communication device by the decoder with pre-stored ID information of a pre-determined sensor communication device and notifies of reception of a wake-up signal when the extracted ID information and the pre-stored ID information are the same.