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Routage Cross-Layer et Gestion de la Mobilité dans les Réseaux Maillés Sans fil (Cross-Layer Routing and Mobility Management in Wireless Mesh Networks)
Citation key I-CLRMMWMN-06
Author Iannone, Luigi
Year 2006
Month April
School Université Pierre et Marie Curie – Paris VI
Abstract The wireless revolution triggered by the success of IEEE 802.11 standard has pushed the research community to address the design, analysis, development, and deployment of new wireless solutions. In particular, Wireless Mesh Networks (WMN), a two-tier architecture based on Wireless Mesh Routers (WMR), has captured the interest from both academia and industry, because of their ability to accommodate both Wireless ISPs and user requirements. Despite the large amount of research developed in this area, several issues still need to be solved. The following points have become a main concern: (i) the traditional use of the hop-count metric does not capture the very nature of wireless links, resulting in poor transport capacity of wireless systems; (ii) the lack of a definitive solution able to effectively manage mobile users; (iii) the design of WMR is still weak, with custom implementations often based on proprietary solutions. In this thesis we tackle the abovementioned issues and design an efficient solution for multi-hop wireless networks that uses the real properties of wireless links. We provide the following contributions. First, we design and formalize Mesh Routing Strategy (MRS), a cross-layer routing approach. MRS does not depend on any specificity of the MAC layer and relies on simple heuristics able to optimize transmission power and route selection, resulting in important increase of the transport capacity of the mesh backbone. Second, we design and implement MeshDV, a routing framework adapted to WMNs, which includes MRS and is also able to easily manage user mobility. MeshDV combines proactive route computation for routers and on-demand path setup for clients. Proactive route computation is achieved by MRS, while on-demand path setup is performed by new mechanisms that take benefit from the two-tier architecture of WMNs. Third, we develop MeshDVbox, a custom IPv6 based Wireless Mesh Router built using off-the-shelf components and deployed in our laboratory to realize a WMN test-bed. The tests performed on the test-bed demonstrate good results, for both throughput and latency in mobility management. This thesis addresses both theoretic aspects, in the formalization of MRS, as long as practical issues, in the development of MeshDV. The evaluation work ranges from simulation of MRS to real implementation of MeshDV (which integrates MRS) and to the deployment of a real test-bed using MeshDVbox.
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