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Energy and delay trade‐off of the GTS allocation mechanism in IEEE 802.15.4 for wireless sensor networks

Identifieur interne : 000105 ( Main/Exploration ); précédent : 000104; suivant : 000106

Energy and delay trade‐off of the GTS allocation mechanism in IEEE 802.15.4 for wireless sensor networks

Auteurs : Anis Koubaa [Portugal] ; Mário Alves [Portugal] ; Eduardo Tovar [Portugal]

Source :

RBID : ISTEX:F5DD13AEDE76FFCC659E40951334AFD70D941DAD

Mots-clés :

Abstract

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 beacon‐enabled 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 power‐efficient management of the GTS mechanism in an IEEE 802.15.4 cluster. Copyright © 2006 John Wiley & Sons, Ltd.


Url:
DOI: 10.1002/dac.845


Affiliations:


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