3G Mobile Network
The 3G network built upon the architecture of the GPRS / 2.5G network. The user equipment connected through the air interface to an enhanced transiever. The improved RNC (Radio Network Controller) will switch to the phone network for phone calls or switch to an enhanced data network (SGSN).
The 3G or UMTS Radio Access Network (UTRAN) network comprises 4 sub-systems :
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