Standardization of 3G mobile systems is based on ITU (International Telecom Union) recommendations for IMT 2000. IMT 2000 specifies a set of requirements that must be achieved 100% for a network to be called 3G. By providing multimedia capacities and higher data rates, these systems will enhance the range and quality of services provided by 2G systems.
The main contenders for 3G systems are wideband CDMA (W-CDMA) and CDMA2000. The ETSI/ GSM players including infrastructure vendors such as Nokia and Ericsson backed W-CDMA. cdma2000 was backed by the North American CDMA community, led by the CDMA Development Group (CDG) including infrastructure vendors such as Qualcomm and Lucent Technologies. Universal Mobile Telephone System (UMTS) is the widely used European name for 3G.
The proposed IMT-2000 standard for third generation mobile networks globally is a CDMA-based standard that encompasses THREE OPTIONAL modes of operation, each of which should be able to work over both GSM MAP and IS-41 network architectures.
UMTS is the European designation for 3G systems. The UMTS frequency bands selected by the ITU are 1,885 MHz - 2,025 MHz (Tx) and 2,110 MHz - 2,2,20 MHz (Rx). Higher frequency bands could be added in future if need be, for stationary data. There is still some confusion about all the frequency options as FCC has not given clear indications so far. The following table should briefly give an idea about the 3G system specifications.
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