FREQUENCY HOPPING
The mobile station already has to be frequency agile, meaning it can move between transmit and receive, and monitor time slot within one TDMA frame, which normally are on different frequencies. GSM makes use of this inherent frequency agility to implement slow frequency hopping, where the mobile and BTS transmit each TDMA frame on a different carrier frequency. Since multipath fading is dependent on carrier frequency, slow frequency hopping helps to alleviate the problem.
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