Compatibility of UMTS Systems

Spectrum resources are limited and generally lack sparse and unused frequency bands; therefore, new radio systems are introduced over previously reserved bands. The same situation prevails with the UMTS/IMT-2000 core (sometimes called initial) band, extended bands and other bands, which before and sometimes even after utilisation by 3G will be used by other systems and radio services. In order to assure coexistence of the new system with other operating systems (sharing), whilst limiting mutual interference and assuring effective band usage, the conditions of such coexistence must be clearly defined. An insight into these issues is given in this chapter.

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