Universal Mobile Telecommunications System is a component of the International Telecommunication Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology.
Universal Mobile Telecommunications System uses wideband code division multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and bandwidth to Mobile Network Operators.
Universal Mobile Telecommunications System specifies a complete network system, which includes the radio access network (UMTS Terrestrial Radio Access Network, or UTRAN), the core network (Mobile Application Part, or MAP) and the authentication of users via Subscriber Identification Module (SIM) cards.
Universal Mobile Telecommunications System is sometimes also referred to as Freedom of Mobile Multimedia Access (FOMA)[1] or 3GSM.
Unlike EDGE (IMT Single-Carrier, based on GSM) and CDMA2000 (IMT Multi-Carrier), UMTS requires new base stations and new frequency allocations.