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URL:
http://www.3gpp.org
UMTS, also called Wideband Code Division Multiple
Access (W-CDMA), is a successor to the widely used Global System for Mobile
communication (GSM). UMTS air interface transmission differs from GSM, however,
in being based on CDMA rather than TDMA. UMTS provides the following service
types: (i) conversational class (voice, video telephony, video gaming), (ii)
streaming class (multimedia, video on demand, webcast), (iii) interactive class
(web browsing, network gaming, database access), and (iv) background class
(email, SMS, downloading).
Keywords:
wireless, cellular, telephony, third generation, physical layer,
link layer, spread-spectrum
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