UMTS & IMT-2000

A lot has been written about 3 rd generation networks(3G) in last few years.Let us see how did this start in many countries around the world ? ? ?..First of all International Telecommunicaiotns Union (ITU) made a request for appropriate radio transmission technologies(RTI ) for the internal Mobile communications (IMT) 2000 program (ITU, 2000) .IMT-2000 ,formerly called future public land mobile communications systems( FPLMTS), tried to establish a common world wide communication system alowed for terminal and user mobility , supporting the idea of universal personal telecommunications (upt).Within this context . ITU has created several recommendations for FPLMTS systems e.g: network architecture for FPLMTS systems ,Requirements for the radio interface for FPLMTS frame work for services supported by M.816.
The number 2000 in IMT-2000 should indicate the start of the system(year 2000 + x) and the spectrum used around 2000 MHz .IMT-2000 includes different environments such as indoor use ,vehicals ,satellites ,pedestrian's .The world radio conference bands that should be available worldwide for the new IMT-2000 systems recommendations ITU-R.Within these bands, two times 30 Mhz have been reserved for mobile satellite services.
The ITU frequency allocation together with examples from several regions that already indicate the problem of world wide common frequency band.
The ITU frequency allocation together with examples from several regions that already indicate the problem of world wide common frequency band .In Europe some parts of the ITU frequency bands for IMT- 2000 are already allocated for DECT . The remaining frequencies have been split into bands for UTRA-FDD (uplink: 1920-1980 MHz,downlink: 2110-2170 Mhz ) and UTRA -TDD (1900-1920 MHz and 2010-2025 MHz )The technology behind UTRA-FDD and TDD will subsequently be explained in much more details as the form the basis of UMTS.Currently , no other systems is planned for IMT-2000 in Europe. More bandwidth is available in CHINA for Chinese 3G systems TD-SCDMA or possible other 3G systems.