Wireless Sensor Timing Profile Synchronization for Battery Life
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Solution Overview
Problem
Low-power Internet of Things (IoT) devices, such as wireless sensor modules and gateways, face challenges in maintaining battery life while continuously monitoring and transmitting sensor data, as they often require significant power to stay active and listen for incoming data, leading to potential data loss and reduced battery life.
Innovation Solution
Implementing a method where wireless sensor modules and gateways operate in low power mode, waking up only when data needs to be transferred, using a learning state to synchronize communication intervals and optimize timing profiles to reduce power consumption and ensure data integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gateway or hub is kept always powered on to receive data from sensor modules, then data loss is prevented, but power consumption increases significantly
Solution Approach 1:
The gateway operates in periodic wake-up cycles rather than continuously. It wakes up at scheduled intervals to receive data from sensor modules, then enters sleep mode. This periodic operation maintains data reception capability while dramatically reducing average power consumption compared to continuous operation.
Solution Approach 2:
The system performs preliminary synchronization during a learning state where the gateway and sensor modules exchange timing information. This preliminary action establishes predetermined wake-up intervals and communication schedules, enabling the gateway to wake up at optimal times to receive data without continuous monitoring.
2Use of energy by moving object
If sensor modules send data at predefined intervals, then power consumption is reduced, but data may be lost if the gateway is not listening
Solution Approach 1:
The gateway and sensor modules exchange synchronization information and acknowledge data reception. The gateway provides feedback about its wake-up schedule and data reception status, allowing sensor modules to adjust their transmission timing. This feedback mechanism ensures data is sent only when the gateway is listening, preventing data loss while maintaining low power consumption.
Solution Approach 2:
Before normal operation begins, a learning state is executed where the gateway and sensor modules establish synchronized timing profiles. This preliminary synchronization ensures that both parties are aligned on wake-up intervals and communication schedules before actual data transmission begins, preventing data loss from timing mismatches.
3Productivity
If more sensor modules are added to the network, then monitoring coverage is improved, but battery life becomes harder to maintain
Solution Approach 1:
Each sensor module operates on synchronized periodic wake-up cycles determined during the learning state. This coordination ensures that multiple sensor modules can transmit data at optimized intervals rather than continuously, allowing the network to support more modules while each module maintains its battery life through efficient periodic operation.
Data Source
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AI summary
A method at a module within a sensor system for updating a timing profile, the method including: turning on a radio of the sensor module for a first time duration; detecting signals from other modules within the sensor system; for each signal, storing data comprising a time such signal is received and an identifier for a module sending such signal; sending the data to a server; and receiving the timing profile from the server.