Universal Mobile Telecommunications Service (UMTS)

The RAN of UMTS, known as UTRAN, has different specifications upon the deployment region. The duplex mode, and therefore the frequency allocation as well, varies with the standard. The most widely deployed standard of UTRA is the WCDMA that uses FDD, with the operation bands listed in Table 6.1. In some countries, primarily China, two TDD versions of UTRA are developed and standardized, namely the “glossaryentryTD-CDMA?“glossaryentryfieldTD-CDMA“glsnamefontTD-CDMATime Division “acrshort –CDMA˝“relax —setentrycounterpage“glsnumberformat74Time Division CDMA (TD-CDMA) and TD-SCDMA. The former was only shortly deployed during the early 2020s before being replaced by the latter and other successor technologies. For UTRA-TDD, the frequency bands listed in Table 6.2 are specified.