July 2010
Intermediate to advanced
350 pages
14h 19m
English
Content preview from Smart Phone and Next Generation Mobile Computing
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142 Smart Phone and Next-Generation Mobile Computing
As a spread spectrum radio interface, WCDMA uses soft handoff
just as cdmaOne does for the same reason: It is quite difficult to
control power beyond the hysteresis if hard handoff is employed
because in CDMA systems forcing a mobile station to operate over
some hysteresis level will cause large interference.
The first UMTS network went into operation in the United King-
dom in 2003. AT&T Wireless in the United States deployed UMTS
in selected cities in late 2004. Japan’s largest telecommunication ser-
vice provider NTT DoCoMo launched the first WCDMA-based 3G
network, dubbed FOMA (Freedom of Mobile