9 The RA1/RA1′ Function

08.203GPPRate Adaptation on the Base Station System - Mobile Service Switching Centre (BSS-MSC) InterfaceTS

For AIURs less than or equal to 38,4 kbit/s, the RA1/RA1’ function in the BSS shall be applied on each of the n substreams and there are no significant differences between the single slot case and the multislot case. For AIURs less than or equal to 38,4 kbit/s RA1/RA1’ is as specified in 3GPP TS 04.21 for the single slot case. The table below gives a relation between the AIUR, channel coding and number of substreams. As an example from table 1: The wanted AIUR is 28,8 kbit/s, the number of substreams needed to support this rate is 3. Each individual substream shall be rate adapted as in the single slot case.

For AIURs of 48 kbit/s, 56 kbit/s and 64 kbit/s, RA1/RA1’’ shall be as specified in 3GPP TS 04.21 for these rates.

Table 1: Relationship between AIUR, channel coding and number of channels

Multislot intermediaterate 8 kbps

Multislot intermediate rate of 16 kbps

AIUR

Transparent

Non-transparent

Transparent

Non-transparent

2,4 kbit/s

1

N/A

N/A

N/A

4,8 kbit/s

1

1

N/A

N/A

9,6 kbit/s

2

2

1

1

14,4 kbit/s

3

3

2

N/A

19,2 kbit/s

4

4

2

2

28,8 kbit/s

N/A

N/A

3

3

38,4 kbit/s

N/A

N/A

4

4

48 kbit/s

N/A

N/A

5

N/A

56 kbit/s

N/A

N/A

5

N/A

64 kbit/s

N/A

N/A

6

N/A

9.1 Radio Interface rate of 12 kbit/s

Described in 3GPP TS 04.21.

9.2 Radio Interface rate of 6 kbit/s

Described in 3GPP TS 04.21.

9.3 Radio Interface rate of 3.6 kbit/s

Described in 3GPP TS 04.21.

9.4 Synchronisation

Refer to 3GPP TS 04.21.

9.5 Idle frames

Refer to 3GPP TS 04.21