Time Division Duplexing (TDD)

Time division duplex (TDD) refers to duplex communication where uplink is separated from downlink by the allocation of different time slots in the same frequency band. 

The TDD technique is used in IEEE 802.16 WiMAX, 3G TD-SCDMA and 4G TDD LTE, among others. The 4G LTE network is defined to accommodate both paired spectrum for Frequency Division Duplex, FDD, providing a migration path for the 3G services being used around the globe and unpaired spectrum for Time Division Duplex, TDD LTE, providing the evolution or upgrade path for TD-SCDMA. TDD is typically considered as more spectrum-efficient and better suited for bursty data services.

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