High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! UMTS-TDD, an acronym for Universal Mobile Telecommunications System - time-division duplexing, is a 3GPP standardized version of UMTS networks that use UTRA-TDD. UTRA-TDD is a UTRA that uses time-division duplexing for duplexing. 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.

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