Gprs (General Packet Radio Service) - Siemens CX75 Service Manual

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CX75 Level 2 Service Manual

GPRS (General Packet Radio Service)

GPRS is a new non-voice value added services that allows information to be sent

and received across a GSM mobile telephone network. It supplements today's Circuit

Switched Data (CSD) and Short Message Services (SMS). GPRS involves overlaying

a packet based air interface on the existing circuit switched GSM network. This gives

the option to use a packet-based data service. The information is split into separated

but related "packets" before being transmitted and reassembled at the receiving end.

Theoretically, maximum speeds of up to 171.2 kilobits per second (kbps) are

achievable with GPRS using all eight timeslots at the same time. This is about 3

times as fast as the data transmission speed possible over today's fixed

telecommunications networks and 10 times as fast as current Circuit Switched Data

services on GSM networks

Example: Cell with 1 Frequency channel:

1 physical channel for signaling, 4 physical channels for Circuit switched and 3 physical

channels for Packet switched.

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