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Which among the following is an issue for routing in cognitive radio networks?

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Which among the following is an issue for routing in cognitive radio networks?

(a) Spectrum sensing

(b) Power allocation

(c) Spectrum knowledge

(d) Spectrum characterization

I had been asked this question by my school principal while I was bunking the class.

Query is from Next Generation Wireless Network in division Next Generation Wireless Network of Cognitive Radio

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Right choice is (c) Spectrum knowledge

To explain: The routing layer requires information about the spectrum for determining the path of communication. The consolidation of information obtained by sensing and by characterization operations of the physical layer is a challenge as it is difficult to decide which information should be stored. The user requires local as well as global knowledge of the spectrum.

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