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Umbrella cell approach is possible by using _________

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Umbrella cell approach is possible by using _________

(a) Antenna of same heights

(b) Antenna of different heights

(c) Different voice channels

(d) Different control channels

The question was posed to me during a job interview.

My question is from Handoff Strategies in section The Cellular Concept – System Design Fundamentals of Wireless/Mobile

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Best answer
Right choice is (b) Antenna of different heights

Best explanation: Umbrella cell approach is possible by using different antenna heights and different power levels. By using this approach, it is possible to provide large and small cells which are co-located at a single location.

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