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Author(s): Tiago Semprebom
Carlos Montez
Ricardo Moraes
Francisco Vasques
Paulo José Portugal
Title: Dynamic GTS scheduling of periodic skippable slots in IEEE 802.15.4 Wireless Sensor Networks
Issue Date: 2009
Abstract: The IEEE 802.15.4 standard offers a flexible communication solution for low-ratewireless small area networks. When the beacon mode is enabled, real-time communication ispossible by using the Guaranteed Time Slots (GTS) mechanism. However, the beacon-enabledmode only supports a maximum of seven GTS allocated in each superframe, preventing othernodes to benefit from the guaranteed service. This paper introduces the SIGHT (Skips In GTSscHeduling for IEEE 802.15.4 neTworks) model, which incorporates a dynamic GTS allocationpolicy for IEEE 802.15.4 networks based on the (m,k)-firm task model. Our approach ensuresthat at least m messages are allocated in a guaranteed slot, for any k consecutive superframes.It adopts a deterministic schedulability test and an on-line prioritization heuristic algorithmcalled Slotted DBP (Distance Based Priority) to attend requests according to this schedulabilitymodel. A simulation model has been developed, in order to compare the behaviour in overloadconditions of the proposed Slotted DBP with other approaches (DWCS and FIFO).
Subject: Engenharia electrotécnica, electrónica e informática
Electrical engineering, Electronic engineering, Information engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia electrotécnica, electrónica e informática
Engineering and technology::Electrical engineering, Electronic engineering, Information engineering
Source: Proceedings of 8th IFAC International Conference on Fieldbuses and Networks in Industrial and Embedded Systems (FeT'2009
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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