GSM-R and GPRS
GSM-R and GPRS
GSM-R and GPRS
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<strong>GPRS</strong> Data Throughput<br />
8<br />
12<br />
14.4<br />
20<br />
Header + Protection<br />
User Payload<br />
Maximum speed may be<br />
increased by use of multiple<br />
time slots<br />
CS-1<br />
CS-2<br />
CS-3<br />
CS-4<br />
Timeslots may also be shared<br />
by different MS (spectral<br />
efficiency)<br />
4 coding schemes have been defined from Rel.97,<br />
allowing different trade-offs between throughput <strong>and</strong><br />
radio protection<br />
All <strong>GPRS</strong> MS have to support CS1 to CS4<br />
The link adaptation (LA) algorithm is not st<strong>and</strong>ardized.<br />
(LA is the system which chooses the coding scheme<br />
depending on quality of radio link)<br />
Multislot<br />
No of slots<br />
class Rx Tx Max Sum<br />
4 3 1<br />
8 4 1<br />
5<br />
10 4 2<br />
5<br />
12 4 4 5<br />
4<br />
Kapsch CarrierCom AG<br />
|<br />
42
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