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UMTS-TDD, an acronym for Universal Mobile Telecommunications System (UMTS) - time-division duplexing (TDD), is a 3GPP standardized version of UMTS networks that use UTRA-TDD. UTRA-TDD is a UTRA that uses time-division duplexing for duplex. While a full implementation of UMTS, it is mainly used to provide Internet access in circumstances similar to those where WiMAX might be used. UMTS-TDD is not directly compatible with UMTS: a device designed to use one standard cannot, unless specifically designed to, work on the other, because of the difference in air interface technologies and frequencies used.


UTRA-TDD HCR is one of the air interfaces used for UMTS-TDD. It uses increments of 5 MHz of spectrum, with each slice divided into 10ms frames containing fifteen time slots (1500 per second). The time slots are allocated in fixed percentage for downlink and uplink. TD-CDMA is used to multiplex streams from or to multiple transceivers.


UTRA-TDD LCR is an alternative air interface used for UMTS-TDD. It is based on TD-SCDMA, and uses 1.6 MHz slices of spectrum, and is standardized in UMTS by the 3GPP.

Unlicensed UMTS-TDD

In Europe, CEPT allocated the 2010-2020 MHz range for a variant of UMTS-TDD designed for unlicensed, self-provided use. Some telecom groups and jurisdictions have proposed...
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