Time division duplex (TDD) refers to a wireless communication technology that allows for the transmission of both upstream and downstream data on the same frequency channel, using different time slots.
Time division duplex is similar to other telecommunication techniques such as time division multiplexing (TDM) and frequency division duplex (FDD) but they differ in how they allocate bandwidth for upstream and downstream communication. TDD uses time slots on a single frequency channel, TDM uses time slots on a shared transmission line, and FDD uses separate frequency channels for upstream and downstream communication.
See also: time-division multiplexing
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