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Wireless & Mobility · Intermediate

Time Division Duplex (TDD)

Sharing one frequency for uplink and downlink by alternating in time.

Definition

TDD allocates time slots to transmit and receive on the same channel. Wi-Fi is inherently half-duplex TDD, and many 5G NR mid-band and CBRS deployments use TDD. TDD allows asymmetric uplink/downlink ratios.

Example

CBRS band 48 LTE uses TDD.

Exam tip

Wi-Fi and most 5G mid-band use TDD; many legacy LTE bands use FDD.

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