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Introduction to WCDMA: Physical Channels, Logical Channels, Network, and Operation

Frequency Bands

Frequency allocation is the amount of radio spectrum (frequency bands) that is assigned (allocated) by a regulatory agency for use by specific types of radio services.

It is not possible to use all of the frequency bands assigned to a service provider due to the need for frequency guard bands. Guard bands are a portion frequency that is unused between two channels or bands of frequencies to provide a margin of protection against signal interference. Signal interference may come from radio channels that are operating outside the assigned frequency bands of channels operating near the guard frequency.

In 1992, the frequency bands for UMTS systems were designated at the world administrative radio conference (WARC). The new requirements for the UMTS systems were defined by the international telecommunications union (ITU).

Figure 1.11 shows the frequencies that have been designated for 3 rd generation UMTS WCDMA systems. This diagram shows that the designated frequency bands vary throughout the world because some countries have already assigned (licensed) part of the frequency bands.


Figure 1.11: WCDMA UMTS Frequency Bands

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