IoT Coordinator Node Sleep Mode Synchronization
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Solution Overview
Problem
Wireless IoT networks face challenges in maintaining battery life and synchronization of devices due to the high power consumption of coordinator node devices, which limits their deployment and requires frequent maintenance.
Innovation Solution
Implementing a coordinator node device that enters a sleep mode and wakes up at predetermined intervals based on historical data analysis to conserve battery power, synchronizing with end node devices to correct clock errors and optimize data transmission times, thereby reducing active time and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coordinator node devices remain active continuously to maintain network synchronization and receive data, then synchronization accuracy and data reception reliability are improved, but battery power consumption increases
Solution Approach 1:
The coordinator node device transitions between active and sleep modes periodically. During active periods, it performs synchronization and data reception functions. During sleep periods, it conserves battery power. The device wakes up at scheduled intervals to synchronize clocks with end node devices and receive any pending data, then returns to sleep mode. This periodic operation resolves the contradiction by providing sufficient active time for reliable synchronization while minimizing overall power consumption.
Solution Approach 2:
The system performs preliminary synchronization actions during active periods before entering sleep mode. The coordinator node device synchronizes clocks and prepares data reception schedules in advance while still powered, ensuring that when it wakes from sleep, the network is already synchronized and ready for data transmission without requiring continuous active monitoring.
2Duration of action of moving object
If coordinator node devices enter sleep mode to conserve battery power, then battery life is extended, but synchronization maintenance and data reception capability deteriorate
Solution Approach 1:
The coordinator node device operates in periodic cycles alternating between active and sleep modes. During active cycles, it performs clock synchronization with end node devices and monitors for data transmissions. During sleep cycles, it conserves battery power. The periodic active periods are sufficient to maintain network synchronization because clock drift in low-power IoT devices is minimal over short intervals, and data transmissions are scheduled during known active periods.
Solution Approach 2:
The coordinator node device dynamically adjusts its operational state between active and sleep modes based on network requirements and scheduled events. The device remains flexible in transitioning between states, activating only when synchronization or data reception is needed, and sleeping when the network can tolerate reduced monitoring. This dynamic state management maintains reliability while extending battery life.
3Measurement precision
If coordinator node devices wake up frequently to synchronize with end node devices, then clock synchronization accuracy is improved, but active time and power consumption increase
Solution Approach 1:
The coordinator node device performs clock synchronization periodically at scheduled intervals rather than continuously. Each synchronization event corrects accumulated clock drift between the coordinator and end node devices. The periodic interval is optimized to be frequent enough to maintain acceptable synchronization accuracy for the application while infrequent enough to allow the device to remain in low-power sleep mode for extended periods, thus resolving the contradiction between synchronization precision and power consumption.
Solution Approach 2:
The system performs synchronization at intervals that provide sufficient accuracy for the application requirements without over-synchronizing. The periodic synchronization frequency is calibrated to match the clock drift characteristics of the devices and the tolerance requirements of the specific IoT application, performing just enough synchronization action to maintain accuracy without excessive power consumption from too-frequent wake-ups.
Data Source
AI summary
A device, configured as a coordinator for a wireless IoT network, may include a memory configured to store instructions and a processor configured to execute the instructions to identify Internet of Things (IoT) devices associated with the wireless IoT network; determine a clock error rate for the wireless IoT network; determine a last synchronization time; determine a data time period during which one or more of the IoT devices are expected to send data to the device; and set a wakeup time period for the device based on the determined clock error rate, last synchronization time, and data time period. The processor may be further configured to enter a sleep mode; exit the sleep mode when the wakeup time period begins; and perform a clock synchronization between the device and the plurality of IoT devices during the wakeup time period.