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A mobile phone handset is, at its simplest, a radio transmitter and receiver. Outline the role of base stations and the cellular exchange when a mobile phone is switched on and before a call is made.
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When a mobile phone is switched on, it transmits a radio signal to identify itself, this signal is detected by one or more base stations. The base station transfers the signal to the cellular exchange. A computer at the cellular exchange selects the base station with the strongest signal. The computer also assigns or allocates a carrier wave frequency for communication between the base station and the mobile phone.
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