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Simulation des conditions de trafic intracellulaire d'un réseau sans fil en milieu industriel par un modèle de propagation composite

Abstract : This thesis deals with the use of wireless LANs (WLANs) in an industrial environment as a production line. We treat in depth the impact of propagation conditions, which are particular in these environments, and their implementation in simulation tools. The first part of our work focuses on the choice of a propagation model and its parameters by analytical methods applied to measurements. The comparison between the performances obtained in a reference site and the results obtained by simulations show a clear difference between reality and the simulation. It allowed us to conclude that the choice of the classical models do not allow simulations relevant to this context. For these reasons, we propose, in the second part, a new way to model the propagation conditions in the simulations. Our model, called "Split Model", can distinguish: a link between stations and access point, and a link between stations. It was used in the simulation to study the performances in an industrial environment (rate of loss, delay, speed) of a cell in the infrastructure mode of 802.11. The results show that this space between the stations is heavily blocked, the signal undergoes a significant weakness in its horizontal propagation and creates hidden zones, in which the stations activity can not be detected by other stations of the cell. Collisions at the access point are detected and then yields to degradation in performances. The mechanisms provided by the standard to avoid the effect of hidden terminal (RTS / CTS) were ineffective. The use of Split model in a simulation process highlights the effects due to these hidden areas and allows simulation results to be more representative of the behavior of a cell covering a production line.
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https://theses.hal.science/tel-00725659
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Submitted on : Monday, August 27, 2012 - 3:38:57 PM
Last modification on : Sunday, June 26, 2022 - 9:36:01 AM
Long-term archiving on: : Friday, December 16, 2016 - 8:28:07 AM

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  • HAL Id : tel-00725659, version 1

Citation

Sabri Benferhat. Simulation des conditions de trafic intracellulaire d'un réseau sans fil en milieu industriel par un modèle de propagation composite. Réseaux et télécommunications [cs.NI]. Université Blaise Pascal - Clermont-Ferrand II, 2009. Français. ⟨NNT : 2009CLF21923⟩. ⟨tel-00725659⟩

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