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Theses

Architecture matérielle et protocolaire pour réseaux de capteurs sans fil adaptés à la surveillance environnementale

Abstract : Wireless sensor networks are now a mature technology that can be deployed in a wide range of applications, including environmental monitoring. The energy constraints of this type of network have led to the emergence of two main classes of solutions: those that prioritize throughput at the expense of the range of radio links and those that aim to collect data over large areas but with low and constrained throughputs. Nevertheless, there is an application domain for which data collection is both demanding in terms of radio link range and supported data rate. This thesis addresses this domain, at the interface of existing solution classes, to satisfy applications requiring frequent data collection that must respect a freshness constraint. In this context, our research focuses on the use of a switchable beam antenna equipping the collection point or sink of a wireless sensor network, allowing to emulate a star topology. Each node around the collection point can be reached by at least one of the allowed lobe orientations of such an antenna. The use of this type of antenna has strong impacts on the lower layers (physical and link in particular) of the protocol stack of this new class of solution. This antenna indeed allows to increase the radio range, to be more robust against interferences and obstacles on the signal path, but this at the expense of the intermittence of the connectivity of the nodes of the star. A node is within range of the sink in at least one of the partial topologies induced by the antenna lobe orientation, this point has a strong impact on the MAC layer specifications of such a network. The two main contributions of this thesis are to specify on the one hand the discovery phase of the sink neighborhood which must be executed within an acceptable time frame, and on the other hand to proceed to a frequent data collection constrained by an expiration date. Different variants of these specifications are proposed, based on a grouped polling selecting. They have been partially validated by a theoretical approach and more globally by a simulation via Cooja/Contiki OS. The results obtained show the impact of the proposed mechanisms on the frequency of collection and the freshness of the collected data.
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https://tel.archives-ouvertes.fr/tel-03663270
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Submitted on : Tuesday, May 10, 2022 - 9:11:11 AM
Last modification on : Wednesday, May 11, 2022 - 3:48:24 AM

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2021UCFAC079_SIDIBE.pdf
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  • HAL Id : tel-03663270, version 1

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Guéréguin Der Sylvestre Sidibe. Architecture matérielle et protocolaire pour réseaux de capteurs sans fil adaptés à la surveillance environnementale. Autre [cs.OH]. Université Clermont Auvergne, 2021. Français. ⟨NNT : 2021UCFAC079⟩. ⟨tel-03663270⟩

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