4.7.2 Channel coding for HS-DPCCH when the UE is not configured in MIMO mode and not configured in MIMO mode with four transmit antennas in the serving HS-DSCH cell and Secondary_Cell_Enabled is 0 or 1 and Secondary_Cell_Active is 0
25.2123GPPMultiplexing and channel coding (FDD)Release 17TS
Two forms of channel coding are used, one for the channel quality indication (CQI) and another for HARQ-ACK (acknowledgement).
4.7.2.1 Channel coding for HS-DPCCH HARQ-ACK
The HARQ acknowledgement message to be transmitted, as defined in [4], shall be coded to 10 bits as shown in Table 15. The output is denoted w0, w1,…w9.
Table 15: Channel coding of HARQ-ACK when the UE is not configured in MIMO mode and not configured in MIMO mode with four transmit antennas in the serving HS-DSCH cell and Secondary_Cell_Enabled is 0 or 1 and Secondary_Cell_Active is 0
|
HARQ-ACK message to be transmitted |
w0 |
w1 |
w2 |
w3 |
w4 |
w5 |
w6 |
w7 |
w8 |
w9 |
|
ACK |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
1 |
|
NACK |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
PRE |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
|
POST |
0 |
1 |
0 |
0 |
1 |
0 |
0 |
1 |
0 |
0 |
4.7.2.2 Channel coding for HS-DPCCH channel quality indication
The channel quality indication is coded using a (20,5) code. The code words of the (20,5) code are a linear combination of the 5 basis sequences denoted Mi,n defined in the table below.
Table 15A: Basis sequences for (20,5) code
|
i |
Mi,0 |
Mi,1 |
Mi,2 |
Mi,3 |
Mi,4 |
|
0 |
1 |
0 |
0 |
0 |
1 |
|
1 |
0 |
1 |
0 |
0 |
1 |
|
2 |
1 |
1 |
0 |
0 |
1 |
|
3 |
0 |
0 |
1 |
0 |
1 |
|
4 |
1 |
0 |
1 |
0 |
1 |
|
5 |
0 |
1 |
1 |
0 |
1 |
|
6 |
1 |
1 |
1 |
0 |
1 |
|
7 |
0 |
0 |
0 |
1 |
1 |
|
8 |
1 |
0 |
0 |
1 |
1 |
|
9 |
0 |
1 |
0 |
1 |
1 |
|
10 |
1 |
1 |
0 |
1 |
1 |
|
11 |
0 |
0 |
1 |
1 |
1 |
|
12 |
1 |
0 |
1 |
1 |
1 |
|
13 |
0 |
1 |
1 |
1 |
1 |
|
14 |
1 |
1 |
1 |
1 |
1 |
|
15 |
0 |
0 |
0 |
0 |
1 |
|
16 |
0 |
0 |
0 |
0 |
1 |
|
17 |
0 |
0 |
0 |
0 |
1 |
|
18 |
0 |
0 |
0 |
0 |
1 |
|
19 |
0 |
0 |
0 |
0 |
1 |
The CQI values 0 … 30 as defined in [4] are converted from decimal to binary to map them to the channel quality indication bits (1 0 0 0 0) to (1 1 1 1 1) respectively. The information bit pattern (0 0 0 0 0) shall not be used in this release. The channel quality indication bits are a0 , a1 , a2 , a3 , a4 (where a0 is LSB and a4 is MSB). The output code word bits bi are given by:
where i = 0, …, 19.