Jabarkan TD-CDMA dari UMTS-TDD dalam bahasa sunda

TD-CDMA is the primary air interface used by UMTS-TDD. It uses increments of 5 MHz of spectrum, with éach slice divided into 10ms frames containing fifteen time slots (1500 per second). The time slots are allocated in fixed percentage for downlink and uplink. Code Division Multiple Access is used within éach time slot to multiplex stréams from or to multiple transceivers.

TD-CDMA is an IMT-2000 3G air interface, classified as IMT-TD Time-Division, and is standardized in UMTS by the 3GPP as UTRA TDD-HCR. TD-CDMA is closely related to W-CDMA, and provides the same types of channels where possible. W-CDMA's HSDPA/HSUPA enhancements are also implemented under TD-CDMA.

An alternative air interface for UMTS-TDD is TD-SCDMA, which uses 1.6 MHz slices of spectrum, and is standardized in UMTS by the 3GPP as UTRA TDD-LCR.