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5G Fundamentals
5G NR supports both Frequency Division Duplexing and Time Division Duplexing, but the balance between them has shifted dramatically compared to LTE. FDD uses paired spectrum with separate frequencies for uplink and downlink transmitting simultaneously. TDD uses a single unpaired frequency band and alternates between uplink and downlink in time domain slots. In 5G the key mid-band allocations around 3.5 GHz and all millimeter-wave spectrum are unpaired, making TDD the dominant duplexing mode for new 5G deployments while FDD continues on refarmed low-band carriers.
Try these first, even if you're not sure. Guessing primes your brain.
A walkie-talkie takes turns on one channel. A phone call uses two channels simultaneously. Which matches TDD?
A regulator sells one unpaired spectrum block. Which duplexing mode works?
On a TDD cell, uplink feels less responsive than downlink. Why?
Answer all 3to continue — it's OK to be wrong.