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Mobile Messaging Technologies and Services: SMS, EMS and MMS ...

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Gateway MSC (GMSC)<br />

interconnects the core<br />

network with external<br />

circuit-switched networks.<br />

<strong>Mobile</strong> Switching Centre (MSC)<br />

manages circuit-switched calls<br />

<strong>and</strong> performs functions such as<br />

user registration, user location<br />

updates, ...<br />

Base Station Controller (BSC)<br />

The BSC manages the radio<br />

resources for one or more<br />

BTSs<br />

<strong>Mobile</strong> Equipment (ME)<br />

The ME contains the radio<br />

transceiver, the display <strong>and</strong><br />

digital signal processors.<br />

U m<br />

A<br />

Public Switch<br />

Telephone Network<br />

GMSC<br />

MSC/<br />

VLR<br />

A bis<br />

BTS<br />

ME<br />

C u<br />

Home Location Register<br />

(HLR) is a database where<br />

subscribtion information<br />

<strong>and</strong> user locations are<br />

stored.<br />

SIM<br />

HLR<br />

G s<br />

BSC<br />

MS<br />

A bis<br />

SGSN GGSN Internet<br />

BTS<br />

Subscriber Identity Module (SIM)<br />

The SIM allows the network to<br />

identify the user. The SIM can host<br />

an application<br />

Base Station Subsystem Core Network<br />

G b<br />

Gateway GPRS Support<br />

Node (GGSN) interconnects<br />

the core network with external<br />

packet-switched networks.<br />

Serving GPRS Support<br />

Node (SGSN) provides<br />

functions similar to the<br />

ones of the MSC/VLR but<br />

for the packet-switched<br />

domain.<br />

Base Transceiver Station (BTS)<br />

The BTS contains the radio<br />

transmitters allowing the<br />

communications with mobile stations.<br />

Figure 1.5 GPRS architecture

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