UMTS/HSPA+ Module Series
UG89 Hardware Design
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10
Appendix C GPRS Multi-slot
Classes
Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot
classes are product dependent, and determine the maximum achievable data rates in both the uplink and
downlink directions. Written as 3+1 or 2+2, the first number indicates the amount of downlink timeslots,
while the second number indicates the amount of uplink timeslots. The active slots determine the total
number of slots the GPRS device can use simultaneously for both uplink and downlink communications.
The description of different multi-slot classes is shown in the following table.
Table 35: GPRS Multi-slot Classes
Multislot Class
Downlink Slots
Uplink Slots
Active Slots
1
1
1
2
2
2
1
3
3
2
2
3
4
3
1
4
5
2
2
4
6
3
2
4
7
3
3
4
8
4
1
5
9
3
2
5
10
4
2
5
11
4
3
5
12
4
4
5
