Gestion dynamique des topologies sans fils

Abstract : The issue of quality of service in IEEE 802.11 Wireless LAN remains a delicate challenge to be overcome by the scientific community. The performance evaluation of actual approaches made to support QoS in these networks, also through simulations, analytical models or real measurements shows that these approaches are still insufficient to give real guarantees of quality of services to wireless users. Following the work being done by CRAN which focused on balancing loads in industrial Ethernet networks we opted for a method of load balancing in the hotspots 802.11. Our objective is to balance access points loads to meet the needs in terms of quality of service of wireless users application?s. These requirements are expressed in terms of availability, delays, bandwidth ... We defined a load balancing algorithm to dynamically establish optimal associations between users in a hotspot and access points in service. A protocol exchanges between wireless stations and access points and between access points and a load balancing server has been established. The operation of the protocol was verified and simulated using SDL and MSC tools. To evaluate the performance of the balancing approach over the 802.11 standard method, a set of simulations were carried out. Those OPNET simulations show that the proposed approach can improve a set of quality of service parameters by the wireless users. In the future, we continue to work on the evaluation of this approach coupled with the new recommendations of the IEEE 802.11e standard and to find technical solutions necessary for its implementation in real networks.
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Issam Jabri. Gestion dynamique des topologies sans fils. Autre [cs.OH]. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10062⟩. ⟨tel-01748448⟩

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