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GSM/GPRS Module Series

GC10 Hardware Design

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Appendix C GPRS Multi-slot Class

Twenty-nine classes of GPRS multi-slot modes are defined for MS in GPRS specification. Multi-slot

classes are product dependant, 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 28: 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