Gprs (Gerenal Packet Radio Service) - Siemens ST55 Service Manual

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S I E M E N S

P T E L T D

ST55 Level 2 Service Manual

1 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.

Figure1. Example of GPRS data transmission

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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