are paired 4.1.3 Spectrum for 3G and which are unpaired. For the paired spectrum, the bands for uplink (mobile transmit) and downlink (base- Spectrum for 3G was first identified at the World station transmit) are identified for Frequency Division Administrative Radio Congress WARC-92. Resolution Duplex (FDD) operation. The unpaired bands can for 212 identified the bands 1885-2025 and 2110-2200 example be used for Time Division Duplex (TDD) op- MHz as intended for use by national administrations that eration. Note that the band that is most globally want to implement IMT-2000. Of these 230 MHz of 3G deployed for 3G is still 2 GHz. spectrum, 2 X 30 MHz were intended for the satellite 3GPP first defined UTRA in Release 99 for the 2 GHz component of IMT-2000 and the rest for the terrestrial bands, with 2x60 MHz for UTRA FDD and 20+ component. Parts of the bands were (during the 1990s) 15 MHz of unpaired spectrum for UTRA TDD. A sep- used for deployment of 2G cellular systems, especially in arate definition was also made for the use of UTRA the Americas. The first deployment of 3G in 2001-2002 in the US PCS bands at 1900 MHz. The concept of by Japan and Europe were done in this band allocation, frequency bands with separate and release-independent Background of 3G evolution CHAPTER 4.1 Table 4.1-1 Frequency bands defined by 3GPP for UTRA FDD. Table 4.1-2 Frequency bands defined by 3GPP for UTRA TDD. Uplink Downlink TDD band Frequency range (MHz) range (MHz) region(s) range (MHz) region(s) (MHz) 1920-1980 2110-2170 Europe, Asia 1900-1920 Europe, Asia 2010-2025 1850-1910 1930-1990 Americas (Asia) 1850-1910 (Americas) 1710-1785 1805-1880 Europe, Asia 1930-1990 (Americas) 1910-1930 (Americas) 1710-1755 2110-2155 Americas 2570-2620 Europe 824-849 869-894 Americas 830-840 875-885 Japan geographical area and even for co-location of base stations 2500-2570 2620-2690 Europe at the same sites using different bands. Release 7 of the 3GPP specifications include ten fre- 880-915 925-960 Europe, Asia quency bands for FDD and four f