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Sensors 2018, 18(4), 1209;

Escalator: An Autonomous Scheduling Scheme for Convergecast in TSCH

Department of Computer Engineering, Graduate School of Ajou University, Suwon 16499, Korea
Department of Cyber Security, Ajou University, Suwon 16499, Korea
Author to whom correspondence should be addressed.
Received: 13 March 2018 / Revised: 9 April 2018 / Accepted: 10 April 2018 / Published: 16 April 2018
(This article belongs to the Section Sensor Networks)
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Time Slotted Channel Hopping (TSCH) is widely used in the industrial wireless sensor networks due to its high reliability and energy efficiency. Various timeslot and channel scheduling schemes have been proposed for achieving high reliability and energy efficiency for TSCH networks. Recently proposed autonomous scheduling schemes provide flexible timeslot scheduling based on the routing topology, but do not take into account the network traffic and packet forwarding delays. In this paper, we propose an autonomous scheduling scheme for convergecast in TSCH networks with RPL as a routing protocol, named Escalator. Escalator generates a consecutive timeslot schedule along the packet forwarding path to minimize the packet transmission delay. The schedule is generated autonomously by utilizing only the local routing topology information without any additional signaling with other nodes. The generated schedule is guaranteed to be conflict-free, in that all nodes in the network could transmit packets to the sink in every slotframe cycle. We implement Escalator and evaluate its performance with existing autonomous scheduling schemes through a testbed and simulation. Experimental results show that the proposed Escalator has lower end-to-end delay and higher packet delivery ratio compared to the existing schemes regardless of the network topology. View Full-Text
Keywords: wireless sensor network; TSCH; convergecast; autonomous scheduling; RPL wireless sensor network; TSCH; convergecast; autonomous scheduling; RPL

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Oh, S.; Hwang, D.; Kim, K.-H.; Kim, K. Escalator: An Autonomous Scheduling Scheme for Convergecast in TSCH. Sensors 2018, 18, 1209.

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