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A key challenge in routing in Cognitive Radio Networks (CRNs) is how to adaptively and efficiently select a route and assign resources along that route according to the surrounding environment. In this paper, the authors propose a distributed routing protocol for CRNs, in which path selection and resource allocation (e.g. spectrum, transmission power, and transmission rate) are determined by receivers. Because this process is done on a per-packet and per-hop basis, the proposed protocol can efficiently adapt to spectrum dynamics and node mobility. In addition, spectrum efficiency is increased through dynamic spectrum allocation and transmission power control.
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