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Journal Articles Computer Networks Year : 2015

Adaptive Synchronization in Multi-Hop TSCH Networks

Abstract

Time Slotted Channel Hopping (TSCH) enables highly reliable and ultra-low power wireless networking, and is at the heart of multiple industrial standards. It has become the de facto standard for industrial low-power wireless solutions, and a true enabler for the Industrial Internet of Things. In a TSCH network, all nodes remain tightly synchronized by periodically communicating with one another to compensate for clock drift. The synchronization algorithm used in a network determines how often the nodes need to re-synchronize, which greatly influences their energy consumption. This article presents an adaptive synchronization technique which allows a node to learn and predict how its clock is drifting relative to its neighbors’, and coordinates the instants at which the nodes re-synchronize. This technique increases synchronization accuracy, while reducing synchronization communication overhead, thereby extending the battery lifetime of the network. Through simulation, we show how adaptive synchronization allows the nodes in a 3-hop deep network to maintain synchronization within 76μs of one another, while sending an average of only 18.9 re-synchronization packets per hour, a 83% reduction compared to a network not using adaptive synchronization. Through experimentation on a range of hardware platforms, we show how adaptive synchronization is needed for interoperability.
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Dates and versions

hal-01208266 , version 1 (02-10-2015)

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Tengfei Chang, Thomas Watteyne, Kris Pister, Qin Wang. Adaptive Synchronization in Multi-Hop TSCH Networks. Computer Networks, 2015, 76 (C), pp.165-176. ⟨10.1016/j.comnet.2014.11.003⟩. ⟨hal-01208266⟩
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