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Communications is one of the most critical factors in disaster recovery process. However, after a major disaster, existing communications infrastructures may be heavily damaged or even completely unusable. It is necessary that communicationsare to be promptly restored to the disaster area, which is the goal of our national project. The project aims to build three tiers wireless mesh network from remaining wireless access points in order to provide communications services to the disaster area. This work introduces a unique multiple tiers wireless mesh network project. In addition, this work also illustrates merits in optimizing the number of mesh routersin order to achieve the optimum performance by presenting both theoretical and simulation results of a specific scenario of multiple tiers wireless mesh network

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