Guard Time Optimisation for Energy Efficiency in IEEE 802.15.4-2015 TSCH Links

  • Georgios Z. PapadopoulosEmail author
  • Alexandros Mavromatis
  • Xenofon Fafoutis
  • Robert Piechocki
  • Theo Tryfonas
  • George Oikonomou
Conference paper
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 190)


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.


Internet of Things IEEE 802.15.4-2015 TSCH Synchronisation Guard time Performance evaluation Energy consumption 



This work was partially performed under IRC-SPHERE funded by EPSRC, Grant EP/K031910/1.


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Copyright information

© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2017

Authors and Affiliations

  • Georgios Z. Papadopoulos
    • 2
    Email author
  • Alexandros Mavromatis
    • 1
  • Xenofon Fafoutis
    • 1
  • Robert Piechocki
    • 1
  • Theo Tryfonas
    • 1
  • George Oikonomou
    • 1
  1. 1.Faculty of EngineeringUniversity of BristolBristolUK
  2. 2.IRISA, Télécom BretagneInstitut Mines-TélécomParisFrance

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