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