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Which among the following techniques require geographic information database?

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Which among the following techniques require geographic information database?

(a) Policy awareness

(b) Regulation awareness

(c) Mobility and trajectory awareness

(d) Background environment awareness

The question was posed to me in exam.

Enquiry is from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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The correct option is (c) Mobility and trajectory awareness

The best I can explain: Mobility and trajectory awareness computes the speed and direction of a cognitive radio. Speed and trajectory is estimated by analyzing the change of location of the radio over a period of time and by utilizing the resources of a geographic information database.

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