Multi-source Time Synchronisation in IEEE std 802.15.4-2015 TSCH Networks

IEEE std 802.15.4-2015 Time Slotted Channel Hopping (TSCH) extends and replaces multiple proprietary industrial standards to support ultra-reliable and ultralow power operation in Industrial Internet of Things. Under TSCH, all devices must remain continuously synchronised with their time source neighbour. To do so, the nodes either periodically exchange control packets or data packets to compensate for clock drift. However, single time source neighbour scheme endangers de-synchronisation in the wireless network. In this letter, we propose using multiple time source parents to improve the synchronisation of the the network.