Network Structure of the GPRS Figure 1shows the structure of a GPRS network.
Figure 1 Structure of the GPRS http://localhost:7904/pages/31185560/15/31185560/15/resources/figure/usn/fig_0_11002.png | MS: mobile station
| RAN: radio access network
| | CN-CS: core network-circuit switching
| CN-PS: core network-packet switching
| | BSS: GSM base station subsystem
| UTRAN: UMTS terrestrial radio access network
| | BTS: base transceiver station
| BSC: base station controller
| | NodeB: UMTS base station
| RNC: radio network controller
| | SGSN: serving GPRS support node
| GGSN: gateway GPRS support node
| | CG: charging gateway
| BG: border gateway
| | DNS: domain name server
| AAA: authentication, authorization and accounting
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As shown in Figure 1, a GPRS network consists of the following parts:
- MS: user equipment capable of originating and receiving calls over the air interface. To handle data services, the MS establishes a logical link with the PS domain.
- RAN: handles all radio related functions.
- CN-CS: provides circuit services and connects to external circuit switched networks, such as a public switched telephone network (PSTN).
- CN-PS: provides packet data services and connects to external public data networks (PDNs), such as the Internet.
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