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Parent and PHY Selection in Slot Bonding IEEE 802.15.4e TSCH Networks.

Glenn Daneels1, Dries Van Leemput2, Carmen Delgado3

  • 1Internet Technology and Data Science Lab, University of Antwerp-imec, 2000 Antwerp, Belgium.

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Summary

This study introduces a distributed method for selecting physical layers (PHY) and network parents in Time-Slotted Channel Hopping (TSCH) sensor networks. The approach improves packet delivery ratios, matching near-optimal performance with lower computational complexity.

Keywords:
Contiki implementationPHY selectionTSCHmulti-PHYparent selectionroutingslot bonding

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Area of Science:

  • Wireless Sensor Networks
  • Industrial Internet of Things (IIoT)

Background:

  • IEEE 802.15.4e Time-Slotted Channel Hopping (TSCH) networks face limitations due to single physical (PHY) layer constraints in industrial settings.
  • Research is shifting towards multi-PHY support in TSCH to overcome these limitations and enhance network robustness.

Purpose of the Study:

  • To propose a distributed PHY and parent selection heuristic for multi-PHY TSCH sensor networks utilizing slot bonding.
  • To integrate this heuristic into the 6TiSCH protocol stack and its Routing Protocol for Low-power and Lossy networks (RPL) layer.
  • To implement and evaluate the proposed slot bonding mechanism in the Contiki-NG IIoT operating system.

Main Methods:

  • A heuristic for distributed PHY and parent selection in multi-PHY TSCH networks with slot bonding was developed.
  • The heuristic was integrated into the 6TiSCH protocol stack, specifically targeting the RPL layer.
  • A slot bonding implementation was created for the Contiki-NG IIoT operating system.

Main Results:

  • Extensive simulations and real-world testbed deployments demonstrated the effectiveness of the proposed mechanism.
  • The computationally efficient distributed approach achieved packet delivery ratio (PDR) results comparable to complex centralized schedulers.
  • Slot bonding enabled adaptable slot durations tailored to the data rates of selected PHYs.

Conclusions:

  • The proposed distributed PHY and parent selection heuristic offers a practical solution for enhancing TSCH sensor network performance in industrial environments.
  • This approach provides a near-optimal balance between computational efficiency and packet delivery performance.
  • The implementation in Contiki-NG and integration with 6TiSCH pave the way for more robust and adaptable IIoT networks.