4.7A Coding for HS-SICH type 2 (1.28 Mcps TDD only)

25.2223GPPMultiplexing and channel coding (TDD)Release 17TS

HS-SICH type 2 is used for dual stream transmission when UE is configured in MIMO mode.

The following information, provided by higher layers, is transmitted by means of the HS-SICH type 2 physical channels.

– Recommended Modulation Format (RMF) for stream 1 (1 bit): x_rmf1,1

– Recommended Modulation Format (RMF) for stream 2 (1 bit): x_rmf2,1

– Recommended Transport-block size (RTBS) for stream 1 (n=6 bits): x_tbs1,1, x_tbs1,2, …, x_tbs1,n

– Recommended Transport-block size (RTBS) for stream 2 (n=6 bits): x_tbs2,1, x_tbs2,2, …, x_tbs2,n

– Hybrid-ARQ information ACK/NACK for stream 1 (1 bit): x_an1,1

– Hybrid-ARQ information ACK/NACK for stream 2 (1 bit): x_an2,1

The following coding/multiplexing steps can be identified:

– separate coding of RMF, RTBS and ACK/NACK (see subclause 4.7A.2);

– multiplexing of HS-SICH information (see subclause 4.7A.3);

– interleaving for HS-SICH (see subclause 4.7A.4);

– mapping to physical channels (see subclause 4.7A.5).

The general coding/multiplexing flow for HS-SICH type 2 is shown in the figure 20A.

Figure 20A: Coding and multiplexing for HS-SICH type 2

4.7A.1 HS-SICH type 2 information field mapping

4.7A.1.1 RMF information mapping

The RMF information bit for each stream, x_rmf1,1 for stream 1 or x_rmf2,1for stream 2, shall be mapped according to the mapping given in subclause 4.7.1.1 respectively.

4.7A.1.2 RTBS information mapping

The RTBS information bits for each stream , x_tbs1,1, x_tbs1,2, …, x_tbs1,n for stream 1 or x_tbs2,1, x_tbs2,2, …, x_tbs2,n for stream 2, shall be mapped according to the mapping given in subclause 4.7.1.2 respectively.

4.7A.1.3 ACK/NACK information mapping

The ACK/NACK information bit for each stream, x_an1,1 for stream 1 or x_an2,1 for stream 2, shall be mapped according to the mapping given in subclause 4.7.1.3 respectively.

4.7A.2 Coding for HS-SICH type 2

4.7A.2.1 Field Coding of ACK/NACK

The ACK/NACK bit for stream 1, x_an1,1 , shall be repetition coded to 36 bits. The coded bits are defined as .

The ACK/NACK bit for stream 2, x_an2,1 , shall be repetition coded to 36 bits. The coded bits are defined as .

4.7A.2.2 Field Coding of CQI

The quality information for each stream consists of Recommended Transport Block Size (RTBS) and Recommended Modulation Format (RMF) fields. The 6 bits of the RTBS field for each stream are coded to 32 bits using a (32, 6) 1^st order Reed-Muller code respectively. The coding procedure for each stream is performed according to section 4.7.2.2 shown in figure 21A and figure 21B.

Figure 21A: Field coding of RTBS information bits for stream 1

Figure 21B: Field coding of RTBS information bits for stream 2

The RMF bit for stream 1, x_rmf1,1 , is repetition coded to 16 bits to produce the bits . where n_CQI = 48.

The RMF bit for steam 2, x_rmf2,1 , is repetition coded to 16 bits to produce the bits . where n_CQI = 48.

4.7A.3 Multiplexing of HS-SICH type 2 information fields

The CQI bits for each stream, or, are multiplexed with the repetition coded ACK/NACK bits for each stream, or , to produce the bits where is the number of physical channel bits carried by HS-SICH, according to the following rule:

4.7A.4 Interleaver for HS-SICH type 2

Interleaver for HS-SICH shall be done with the general method described in 4.2.11.1.

4.7A.5 Physical channel mapping for HS-SICH type 2

Physical channel mapping for HS-SICH shall be done with the general method described in 4.2.12.