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RTOS-Integrated Time Synchronization for Self-Deployable Wireless Sensor Networks.

Sarah Goossens1, Valentijn De Smedt2, Lieven De Strycker1

  • 1WaveCore, Department of Electrical Engineering (ESAT), KU Leuven, Ghent Campus, 9000 Ghent, Belgium.

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Summary
This summary is machine-generated.

This study introduces a new method for precise time synchronization in Wireless Sensor Networks (WSNs). It enables resource-constrained Internet of Things (IoT) devices to achieve Coordinated Universal Time (UTC) synchronization without individual Global Navigation Satellite System (GNSS) receivers, reducing costs and complexity.

Keywords:
FreeRTOSInternet of ThingsLoRatime synchronizationwireless sensor networks

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Area of Science:

  • Computer Science
  • Electrical Engineering
  • Network Engineering

Background:

  • Wireless Sensor Networks (WSNs) and Internet of Things (IoT) devices face deployment challenges due to manual configuration and time synchronization complexities.
  • Resource-constrained devices in WSNs often lack dedicated hardware for precise timekeeping, hindering time-critical operations.

Purpose of the Study:

  • To present a novel Real-Time Operating System (RTOS)-integrated method for distributing Coordinated Universal Time (UTC) across WSNs.
  • To reduce hardware costs and system complexity by eliminating the need for individual Global Navigation Satellite System (GNSS) or Real-Time Clock (RTC) modules on each sensor node.

Main Methods:

  • Developed an RTOS-integrated time synchronization technique linking the RTOS tick count to a global UTC reference.
  • Utilized a single GNSS-enabled host to distribute the absolute time reference throughout the network.
  • Implemented and tested the method on custom hardware running FreeRTOS.

Main Results:

  • Achieved network-wide time synchronization with a task synchronization error below ±30 μs.
  • Demonstrated precise execution of time-critical tasks on sensor nodes without dedicated RTC or GNSS hardware.
  • Validated the method on a 32 MHz clock frequency sensor node.

Conclusions:

  • The proposed method significantly simplifies WSN deployment and maintenance by enabling precise, network-wide time synchronization.
  • Reduced hardware costs and system complexity are key benefits, making WSNs more accessible and efficient.
  • Enhanced synchronization improves channel utilization, lowers power consumption, and boosts the accuracy of coordinated tasks, enabling self-deployable WSNs.