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public access so far, but very likely private access with next version |
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The evolution of the Mobile Networks is shown in this series of pictures.
Click on "2G GSM", then on "Next" for
some form of slide show.
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GPRS introduces packet switching into the GSM core network and enables access to packet data networks.
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With Release 3 (aka UMTS Phase 1) a new radio access network called UTRAN (UMTS Terrestrial
Radio Access Network) is introduced, based on W-CDMA (instead of TDMA/FDMA) air interface transmission.
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With Release 4, the MSC functionality is split into two entities:
- The MSC Server, which provides the control functions
- The Media Gateway (MGW) which provides the bearer switching functions and,
if necessary, the conversion fonctions between two different formats. A single MSC
Server can control multiple MGWs.
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