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GPRS |
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GPRS
General Packet Radio Service |
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Overview
GPRS was designed to overcome the limitation of GSM technology on data traffic. It supplements today's Circuit Switched Data and Short Message Service. Theoretically, it can support data speed up to 171.2kpps by combining all eight timeslots at the same time. This is about three times as fast as the data transmission speeds possible over today's fixed telecommunications networks and ten times as fast as current Circuit Switched Data services on GSM networks. By allowing information to be transmitted more quickly, immediately and efficiently across the mobile network, GPRS may well be a relatively less costly mobile data service compared to SMS and Circuit Switched Data.
The physical layer now consists of four coding schemes (CS), which may be utilized for either the downlink (forward link) or the uplink (reverse link).
| Scheme |
Modulation |
Data Rate (kbit/s) |
| CS-1 |
GMSK |
8.8 |
| CS-2 |
GMSK |
11.2 |
| CS-3 |
GMSK |
14.8 |
| CS-4 |
GMSK |
17.6 |
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