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Mécanismes de traitement des données dans les réseaux de capteurs sans fils dans les cas d'accès intermittent à la station de base

Abstract : Wireless Sensor Networks have evolved as an alternative to wired networks fit for quick deployments in areas with limited access. New protocols have been deviees to deal with the inherent scarcity of resources that characterizes such netvorks. Energy efficient network protocols are used for communication between nades. Data collected by wireless nades is transmitted at an energy cost and therefore carefully managed. The remote deployment of wireless networks opens the possibility of malicious attacks on the data and on the infrastructure itself. Security measures have also been devised, but they come at an energy cost. One item that has received little attention is the situation of the data sink becoming unreachable. The nodes still collect data as instructed and accumulate it. Under prolonged unavailability of the sink node, the storage space on sensor nades is used up and collecting new data is no longer feasible. Our proposal for a prioritized data reduction alleviates this problem. The collected data is divided into data units who are assigned an importance level calculated in agreement with the business case. We have proposed data reduction primitive operations that reduce the needed space while only losing a limited amount of data resolution. A multi-node deployment opens the possibility for data load sharing between the nodes as well as redundancy. Algorithms were proposed to evaluate the potential gain ofthese approaches in relation to the amount of energy spent for data transfer. The proposed approach works well in coping with fixed size data storage by trimming the low interest data in a manner that data is still usable.
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Cosmin Dini. Mécanismes de traitement des données dans les réseaux de capteurs sans fils dans les cas d'accès intermittent à la station de base. Autre [cs.OH]. Université de Haute Alsace - Mulhouse, 2010. Français. ⟨NNT : 2010MULH5092⟩. ⟨tel-00576919⟩

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