This paper's goal is to construct robust large ad-hoc network by applying hierarchy architecture. The hierarchy architecture is consisted of backbone nodes and access nodes. Only robust node assumes relay function as the backbone node. One backbone node is linked with other backbone node, therefore the robust links achieve robust relay network. The node requires route to neighbor backbone nodes, then the backbone nodes send Route Request Packet to neighbor backbone nodes reactively. In our system evaluation the route robustness and protocol overhead reduction are proven.
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