Q: what is difference between TDD & FDD in LTE ?
A: In FDD, the uplink and downlink channels are placed on different frequencies and can be in operation at the same time - hence "frequency-divided". In TDD, the uplink and downlink channels are placed at the same frequency and operate at different times - hence "time-divided". In most respects the actual signalling and data exchange methods are the same, though TDD requires tight control over synchronisation in order to prevent uplink and downlink signals from clashing.
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