J.-F. Llibre

University of Toulouse, Tolosa de Llenguadoc, Midi-Pyrénées, France

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Publications (3)0 Total impact

  • Y. Zatout, E. Campo, J.-F. Llibre
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    ABSTRACT: Wireless sensor networks (WSN) have received much attention during the last few years especially with regard to energy consumption. Many Medium Access Control (MAC) protocols were proposed to minimize the energy consumption in WSN, however they cannot be applied in all application contexts. Healthcare monitoring is an important application requiring adapted MAC protocol. This paper presents a new MAC protocol, called T-TMAC, based on simple mechanisms that organize data exchange and reduce collisions in many-to-one architecture. It includes maintenance mechanisms that permit mobility management and topology reconfiguration, which are needed for healthcare. We evaluated the performance of the protocol by analytical model. We propose also real prototyping using Imote2 platforms. We studied the impact of position of nodes and sleep modes on energy and delay. The results emphasize the interest of the protocol.
    Vehicular Technology Conference (VTC Fall), 2012 IEEE; 01/2012
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    ABSTRACT: Health-care monitoring with Wireless Sensor Networks (WSN) has become a major interest during the last few years. The use of efficient communication protocols is crucial in minimizing transmission delay and energy consumption of sensor nodes. In a heterogeneous WSN context, we propose, efficient mobility aware mechanisms which may be implemented in large three-tier WSN. These mechanisms must be designed to be optimal. The aim of this paper addresses common sensor behavior such as data exchange meanwhile responding to the mobility issue in the fore mentioned context. The mechanisms are based on two main protocols: topology creation and data collection in intra- and inter-tiers. Our mechanisms minimize collisions and optimize the duty-cycle of each node. Furthermore, a performance evaluation study detailed by an analytical model is presented in order to validate the designed protocols.
    Consumer Communications and Networking Conference (CCNC), 2011 IEEE; 02/2011
  • Y. Zatout, E. Campo, J.-F. Llibre
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    ABSTRACT: In this paper, we present the design and the modelling of multi-tier Wireless Sensor Network (WSN) for home application. The proposed solution aims to save energy in a heterogeneous wireless sensor environment. The purpose of this work is to assign intelligent behaviour to each sensor node according to its role in the network in order to increase its lifetime and the global network longevity. Simulation results show a better use of components and energy resources of each node in the network.
    Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP), 2009 5th International Conference on; 01/2010