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Which among the following is integrated in IEEE 802.22 Wireless Regional Area Network?

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Which among the following is integrated in IEEE 802.22 Wireless Regional Area Network?

(a) Route decision model

(b) Back up channel list

(c) Interference floor

(d) Spectrum decision model

I got this question in an interview for job.

My doubt stems from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

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The correct option is (b) Back up channel list

To elaborate: The most preferred approach for mitigating performance degradation, due to poor channel characteristics, is building a backup channel list. The potential target channels are added to a list. The list is maintained by sharing information between users in the area. It is integrated in the IEEE 802.22 Wireless Regional Area Network.

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