Gprs (General Packet Radio Service) - Siemens C55/2128 Service Manual

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C55/2128 Level 2 Service Manual

1 GPRS (GENERAL PACKET RADIO SERVICE)

G
PRS 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 signalling, 4 physical channels for Circuit switched
and 3 physical channels for Packet switched
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Figure1. Example of GPRS data transmission
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