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11 Appendix
11.1 GPRS and EGPRS Encoding Scheme
Encoding method
Rate
USF
Pre-coded USF
Radio Block excl.USF and BCS
BCS
Tail
Coded Bits
Punctured Bits
Data rate Kb/s
In the GPRS standard, 29 types of GPRS multislot modes are defined for use by mobile stations. The
multislot class defines the maximum rate of uplink and downlink. The expression is 3+1 or 2+2, the first
number indicates the number of downlink timeslots, and the second number indicates the number of
uplink timeslots. Active timeslots indicate the total number of timeslots that the GPRS device can use for
both uplink and downlink communications.
Multislot Class
1
2
3
4
5
6
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FIBOCOM NL668-LA Series Hardware User Manual
CS-1
1/2
3
3
181
40
4
456
0
9.05
Table 11- 1 GPRS Encoding Scheme
Downlink Slots
1
2
2
3
2
3
CS-2
CS-3
2/3
3/4
3
3
6
6
268
312
16
16
4
4
588
676
132
220
13.4
15.6
Uplink Slots
1
1
2
1
2
2
CS-4
1
3
12
428
16
-
456
-
21.4
Active Slots
2
3
3
4
4
4
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