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( a ) Many mobile communication users found that they couldn't access services or there were no lines when they were in an underground railway

(a) Many mobile communication users found that they couldn't access services or
there were no lines when they were in an underground railway station. You have been assigned to propose a solution for this situation. The mobile communications services operate at 900 MHz to 3.5 GHz.
Draw a diagram/block diagram to show how you might solve this issue.

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