6 Codec List for the Call Control Protocol
26.1033GPPRelease 17Speech codec list for GSM and UMTSTS
For call control on the air interface the Codec Lists need to be specified for each radio access technology separately, because it can not be expected that an UE supports the same Codec Types in different radio access technologies.
3GPP TS 24.008 [9] defines the call control signalling and how to use the "Supported Codec List Information Element" (IE). It contains Codec Lists (in form of Codec Bitmaps) for each supported radio access technology (identified by a SysID).
The coding of this is IE is given here. It is also used for TFO in 3GPP TS 28.062 [7].
6.1 System Identifiers for GSM and UMTS
The system identifiers for the radio access technologies supported by this specification are:
SysID for GSM: 0x0000.0000 (bit 8 .. bit 1)
SysID for UMTS: 0x0000.0100 (bit 8 .. bit 1)
These values are selected in accordance with [7] (3GPP TS 28.062).
6.2 Codec Bitmap
The Codec Types are coded in the first and second octet of the Codec List Bitmap as follows:
|
8 |
7 |
6 |
5 |
4 |
3 |
2 |
bit 1 |
|
|
TDMA EFR |
UMTS AMR 2 |
UMTS AMR |
HR AMR |
FR AMR |
GSM EFR |
GSM HR |
GSM FR |
Octet 1 |
|
bit 16 |
15 |
14 |
13 |
12 |
11 |
10 |
bit 9 |
|
|
(reserved) |
UMTS EVS |
OHR AMR-WB |
OFR AMR-WB |
OHR AMR |
UMTS AMR-WB |
FR |
PDC EFR |
Octet 2 |
A Codec Type is supported, if the corresponding bit is set to "1". All reserved bits shall be set to "0".
6.3 Selected Codec Type
The Selected Codec Type in a BICC-based OoBTC negotiation is coded as shown in Table 6.3-1. The same coding is used also in 3GPP TS 28.062 [7].
NOTE: UMTS_EVS codec type is not supported in TS 28.062 [7].
Table 6.3-1: Coding of the selected Codec_Type (long form)
|
Bit 8…Bit 1 |
Codec_Type |
Name |
|
0000.0000 |
GSM Full Rate (13.0 kBit/s) |
GSM FR |
|
0000.0001 |
GSM Half Rate (5.6 kBit/s) |
GSM HR |
|
0000.0010 |
GSM Enhanced Full Rate (12.2 kBit/s) |
GSM EFR |
|
0000.0011 |
Full Rate Adaptive Multi-Rate |
FR AMR |
|
0000.0100 |
Half Rate Adaptive Multi-Rate |
HR AMR |
|
0000.0101 |
UMTS Adaptive Multi-Rate |
UMTS AMR |
|
0000.0110 |
UMTS Adaptive Multi-Rate 2 |
UMTS AMR 2 |
|
0000.0111 |
TDMA Enhanced Full Rate (7.4 kBit/s) |
TDMA EFR |
|
0000.1000 |
PDC Enhanced Full Rate (6.7 kBit/s) |
PDC EFR |
|
0000.1001 |
Full Rate Adaptive Multi-Rate WideBand |
FR AMR-WB |
|
0000.1010 |
UMTS Adaptive Multi-Rate WideBand |
UMTS AMR-WB |
|
0000.1011 |
8PSK Half Rate Adaptive Multi-Rate |
OHR AMR |
|
0000.1100 |
8PSK Full Rate Adaptive Multi-Rate WideBand |
OFR AMR-WB |
|
0000.1101 |
8PSK Half Rate Adaptive Multi-Rate WideBand |
OHR AMR-WB |
|
0000.1110 |
UMTS Enhanced Voice Services |
UMTS EVS |
|
0000.1111 |
Reserved for Codec_Extension |
for AoIP and TFO, |
|
Up to 1111.1100 |
spare for future use |
|
|
1111.1101 |
Reserved for CSData dummy Codec Type |
for AoIP, |
|
1111.1110 |
Reserved forMuMe2 dummy Codec Type NOTE: codec not to be used across radio interface. |
MuMe2 |
|
1111.1111 |
Reserved forMuMe dummy Codec Type NOTE: codec not to be used across radio interface. |
MuMe |