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Publication
Energy and delay trade-off of the GTS allocation mechanism in IEEE 802.15.4 for wireless sensor networks
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Advisor(s)
Abstract(s)
The IEEE 802.15.4 protocol proposes a flexible communication solution for Low-Rate Wireless Personal
Area Networks (LR-WPAN) including wireless sensor networks (WSNs). It presents the advantage to fit
different requirements of potential applications by adequately setting its parameters. When in beaconenabled
mode, the protocol can provide timeliness guarantees by using its Guaranteed Time Slot (GTS)
mechanism. However, power-efficiency and timeliness guarantees are often two antagonistic requirements in
wireless sensor networks. The purpose of this paper is to analyze and propose a methodology for setting the
relevant parameters of IEEE 802.15.4-compliant WSNs that takes into account a proper trade-off between
power-efficiency and delay bound guarantees. First, we propose two accurate models of service curves for a
GTS allocation as a function of the IEEE 802.15.4 parameters, using Network Calculus formalism. We then
evaluate the delay bound guaranteed by a GTS allocation and express it as a function of the duty cycle. Based
on the relation between the delay requirement and the duty cycle, we propose a power-efficient superframe
selection method that simultaneously reduces power consumption and enables meeting the delay
requirements of real-time flows allocating GTSs. The results of this work may pave the way for a powerefficient
management of the GTS mechanism in an IEEE 802.15.4 cluster.