Spectrum Allocation

With the WCDMA FDD option, the paired 5-MHz carriers in the uplink and
downlink are as follows: uplink�"1920 MHz to 1980 MHz; downlink�"2110
MHz to 2170 MHz.Thus, for the FDD mode of operation, a separation of 190
MHz exists between uplink and downlink. Although 5 MHz is the nominal
carrier spacing, it is possible to have a carrier spacing of 4.4 MHz to 5 MHz
in steps of 200 kHz. This enables spacing that might be needed to avoid
interference, particularly if the next 5-MHz block is allocated to another
carrier.

For the TDD option, a number of frequencies have been defined, including
1900 MHz to 1920 MHz, and 2010 MHz to 2025 MHz. Of course, with
TDD, a given carrier is used in both the uplink and the downlink so that no
separation exists.

Of course, there is no reason why WCDMA could not be deployed at other
frequencies. In fact, the use of other frequencies may well be necessary in
some countries.You may have noticed that the frequency bands defined previously
overlap significantly with frequencies used for PCS in North America.
Therefore, in North America, it will be necessary to move some existing
users from the PCS band and/or acquire a new spectrum in some other
band. The movement of existing PCS users is likely only to happen when a
given carrier that wants to implement UMTS already has an existing PCS system and uses some of the spectrum for UMTS. The net result for such an
operator will, of course, be limited spectrum for both PCS and UMTS.