The carrier spacing has a range of 200 kHz and can differ from
4.2 to 5.4 MHz, the different carrier spacing can be used to
obtain suitable adjacent channel protections depending on the
interference scenario. Figure 30 shows an example, where the
bandwidth of 15 MHz with three cell layers. Larger carrier spacing
can be applied between operators, than within one operators band
in order to avoid inter-operator interference. Interfrequency
measurements and handovers are supported by WCDMA to make use
of three cell layers and carriers.
Figure 30 Frequency utilization
with WCDMA
(Adapted from Holma, H. et al 2000)