G. Papadopoulos, A. Mavromatis, X. Fafoutis, R. Piechocki, T. Tryfonas, G. Oikonomou

Abstract:
Time Slotted Channel Hopping (TSCH) is among the Medium Access Control (MAC) schemes defined in the IEEE 802.15.4-2015 standard. TSCH aims to guarantee high-level network reliability by keeping nodes time-synchronised. In order to ensure successful communication between a sender and a receiver, the latter starts listening shortly before the expected time of a MAC layer frame’s arrival. The offset between the time a node starts listening and the estimated time of frame arrival is called guard time and it aims to reduce the probability of missed frames due to clock drift. In this paper, we investigate the impact of the guard time length on network performance. We identify that, when using the 6TiSCH minimal schedule, the most significant cause of energy consumption is idle listening during guard time. Therefore, we perform empirical optimisations on the guard time to maximise the energy-efficiency of a TSCH link. Our experiments, conducted using the Contiki OS, show that optimal guard time configuration can reduce energy consumption by up to 40\%, without compromising network reliability.
Reference:
G. Papadopoulos, A. Mavromatis, X. Fafoutis, R. Piechocki, T. Tryfonas, G. Oikonomou, "Guard Time Optimisation for Energy Efficiency in IEEE 802.15.4-2015 TSCH Links", in 2nd EAI International Conference on Interoperability in IoT, ser. LNICST, pp. 56-63, 2016
Bibtex Entry:
@INPROCEEDINGS{Papadopoulos-2016-interiot-1,
  title = {Guard Time Optimisation for Energy Efficiency in IEEE 802.15.4-2015 TSCH Links},
  author = {Georgios Papadopoulos and Alexandros Mavromatis and Xenofon Fafoutis and Robert Piechocki and Theo Tryfonas and George Oikonomou},
  year = {2016},
  pages = {56--63},
  publisher = {Springer},
  booktitle = {2nd EAI International Conference on Interoperability in IoT},
  doi = {10.1007/978-3-319-52727-7_8},
  oa-url = {http://research-information.bristol.ac.uk/en/publications/guard-time-optimisation-for-energy-efficiency-in-ieee-8021542015-tsch-links(fe063bf4-68c0-45c5-a312-142a4faf0808).html}
  volume = {190},
  series = {LNICST},
  abstract = {Time Slotted Channel Hopping (TSCH) is among the Medium Access Control (MAC) schemes defined in the IEEE 802.15.4-2015 standard. TSCH aims to guarantee high-level network reliability by keeping nodes time-synchronised. In order to ensure successful communication between a sender and a receiver, the latter starts listening shortly before the expected time of a MAC layer frame’s arrival. The offset between the time a node starts listening and the estimated time of frame arrival is called guard time and it aims to reduce the probability of missed frames due to clock drift. In this paper, we investigate the impact of the guard time length on network performance. We identify that, when using the 6TiSCH minimal schedule, the most significant cause of energy consumption is idle listening during guard time. Therefore, we perform empirical optimisations on the guard time to maximise the energy-efficiency of a TSCH link. Our experiments, conducted using the Contiki OS, show that optimal guard time configuration can reduce energy consumption by up to 40\%, without compromising network reliability.}
}
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Guard Time Optimisation for Energy Efficiency in IEEE 802.15.4-2015 TSCH Links