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Which among the following issues require channel-based models for analysis?

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Which among the following issues require channel-based models for analysis?

(a) Common control channel

(b) Spectrum knowledge

(c) Queue management

(d) Intermittent connectivity

This question was posed to me in final exam.

My enquiry is from Next Generation Wireless Network in portion Next Generation Wireless Network of Cognitive Radio

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The correct option is (d) Intermittent connectivity

Explanation: Intermittent connectivity is caused due to the time-changing nature of the spectrum and loss of channel due to the arrival of the primary user. It is also due to the fact that when the user chooses a channel for communication, the node cannot be reached through other channels. Thus channel-based models are required for developing time-based solutions.

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