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Networks: L17

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GPRS : General Packet Radio System

A packet data overlay onto existing GSM networks - 2½G

packet transmission at up to 115kbs claimed

new mobile devices required – cellphones, PDAs etc.

»

some support simultaneous packet-switched and circuit-switched, some not

device will scan for a local GPRS channel when switched on

»

and attempt to attach to the network

Serving GPRS

Support Node

   (SGSN)

Gateway GPRS

Support Node

 (GGSN)

Base Station

Subsystem (BSS)

Packet

Control

Unit

Radio Network

Home

Location

Register

(HLR)

Business

network

Leased

Line

or

VPN

Upgraded GSM equipment

New GPRS equipment

X25 Network

IP Network/

Internet

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