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Overlay network architectures that use orthogonal channels have been known to provide effective additional resources to underlying networks in high demand. Overlays are composed of relay nodes provided with rich computational resources and multiple wireless interfaces that make them capable of establishing several non-interfering networks. These networks can be used to move traffic around in a non-interfering manner. It is possible to deploy such overlays in sensor networks where sensors suffer from the funnel effect caused by excess traffic flows, to help mitigate this effect. In this paper, the authors address the geographical placement of relay nodes in the region to mitigate the funnel effect in sensor networks.
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