2G
From 1995 to 1998, mobile communication remains in 2G phase.
R99
In 1999, 3GPP release its first edition 3G specifications, with the version number R99. 3G-R99 bring new entities UTRAN, UE, Node-B and so forth. They are all RAN (Radio Access Network) related.
In 3G-R99 architecture, the specifications concerned include:
For A-interface and Iu-interface, 24.008,48.008,3GPP 25.413 UTRAN Iu interface RANAP signalling;
Between MSCs, ISUP Q.761-Q.764, TUP Q.721-Q.724;
MAP, 29.002;
CAP, 22.......
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