Which among the following is an issue for routing in cognitive radio networks?(a) Spectrum sensing(b) Power allocation(c) Spectrum knowledge(d) Spectrum characterizationI 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

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

1.	Which among the following is an issue for routing in cognitive radio networks?(a) Spectrum sensing(b) Power allocation(c) Spectrum knowledge(d) Spectrum characterizationI 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
Answer» 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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