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What type of scheme is non-cooperative intra-network spectrum sharing?

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What type of scheme is non-cooperative intra-network spectrum sharing?

(a) Spectrum centric

(b) Application centric

(c) Device centric

(d) Access centric

The question was posed to me in a job interview.

My question comes from Next Generation Wireless Network in chapter Next Generation Wireless Network of Cognitive Radio

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Right answer is (c) Device centric

Easy explanation: Non-cooperative intra-network spectrum sharing allocates channels depending on observed interference patterns and neighbours. The device is modified so that it can choose the channels for communication. This method exhibits poor performance when compared to cooperative schemes but the communication overhead is reduced.

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