Abstract
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.
Highlights
Time Division Multiple Access (TDMA) and channel hopping-based MAC protocols are being developed for energy efficient and reliable communication in Wireless Sensor Networks (WSNs) composed of low-power wireless devices [1,2,3,4]
We propose an autonomous scheduling scheme, named Escalator, for the convergecast in a Time Slotted Channel Hopping (TSCH) network with the RPL [10] routing protocol
We propose a new autonomous scheduling scheme for the convergecast
Summary
Time Division Multiple Access (TDMA) and channel hopping-based MAC protocols are being developed for energy efficient and reliable communication in Wireless Sensor Networks (WSNs) composed of low-power wireless devices [1,2,3,4]. These protocols perform synchronous and deterministic communications based on timeslot schedules in units of the slotframe (or superframe), a group of timeslots that continuously repeats over time. The timeslot is the basic unit of communication in TSCH, defined as a time sufficient for a pair of devices to exchange a frame and an acknowledgment.
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