GPRS stands for General Packet Radio
Service and it is so called 2+ generation service for cellular phones
which gives possibility for much faster data transfer
(1st generation means analogue mobile phones
) and 2nd generation for digital
)). In theory it's possible to have even as high data rate
as ~160 kbit/s instead of ordinary 9,6 kbit/s with normal GSM
/DCS mobile phone
. This service came at market at early 2001
Higher data rate is possible by combining more than one timeslot allowing user to up/download data with one to seven timeslots (in theory) and by using more efficient channel coding in air interface.
Whatsoever theoretical maximum speed can be created ONLY in laboratory where mobile station is directly connected to base station via cables and no interference is occuring.
Specialists are saying that realistic data rate in commercial network with other GPRS users and circuit switched mobile users might be something like 40 kbit/s at maximum...