TDD

(Time Division Duplexing) A transmission method that uses the same channel for the uplink and downlink (transmit and receive), but separates them by time slots. In 1/1 TDD, downlink slots are interleaved equally with the uplink; a 2/1 TDD gives the downlink twice as many slots as the uplink. However, in a wireless application, power is a critical factor. For example, mobile phone antennas transmit less power than the cell tower antennas, and even a 1/1 TDD yields a lower uplink speed to the tower than the downlink speed from the tower. Contrast with FDD. See also TDD/TTY.

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TDD can stand for:

• Technical design document, a low-level type of design document
• Telecommunications device for the deaf, a device for text communication along a telephone line
• Test-driven development, a type of software development model
• Trick Daddy Dollars, American rap artist
• Three Doors Down, an American rock band
• The Dresden Dolls, a punk cabaret band
• Transdermal Drug Delivery, a method of delivering drugs through the skin and into the bloodstream
• Time-division duplex, the application of time-division multiplexing to separate outward and return signals
• Teniente Jorge Henrich Arauz Airport, Trinidad, Bolivia, IATA airport code
• Ternary Decision Diagram

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