Public Circuit- ~| switched network |
(Public orprńate IP network |
i m |
[ PSTN ][ IP | I t |
f™") |
1PSTC y.-1— '--r* ^ IMS | ||
t |
i i |
1 | |
CS |
CS PS 1 |
CS PS | 1 |
Packet Core |
Access |
Access |
Access |
Access |
2G imtial architecture (GSM) |
2G packet erolution (GPRS/EDGE) |
3GIMS erolution |
EPS architecture |
(1991) |
(2000) |
(2004) |
(2008) |
Figurę 2.4 Evolution of network architecture (from Circuit to packet).
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