An important factor in the 3G-technology evolution path strategy is the support, in the spectrum licensed to operators, of the different radio technologies. Depending on the spectrum licensed for cellular use in a certain region, local operators may have a limited technology choice. Unfortunately, frequency licensing has not been historically uniform across different regions worldwide. Figure 3 shows the spectrum allocation in different regions of the ITU IMT-2000 recommended new bands. The recommended ITU spectrum for new bands for 3G deployment has been allocated in some regions for other purposes. Therefore, operators in different regions will have to try to accommodate in the specific licensed band.
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