4.6E Coding/Multiplexing for HS-SCCH type 5 (1.28 Mcps TDD only)

25.2223GPPMultiplexing and channel coding (TDD)Release 17TS

HS-SCCH shall be of type 5 when the following two conditions are both true:

– the UE is configured in MIMO mode, and

– the variable MIMO SF mode for HS-PDSCH dual stream is SF1.

HS-SCCH type 5 is used for dual stream transmission in MIMO mode. The following information is transmitted by means of the HS-SCCH type 5 physical channels.

– Type flag 1(1 bit): x_flag1,1

– Modulation scheme information for stream 2 (1 bit): x_ms2,1

– Transport-block size offset information for stream 2 (5 bits): x_tbs2,1, x_tbs2,2, …, x_tbs2,5

– Type flag 2 (1 bit): x_flag2,1

– Time slot information (5bits): x_ts,1, x_ts,2, …, x_ts,5

– Transport-block size information for stream 1 (6 bits): x_tbs1,1, x_tbs1,2, …, x_tbs1,6

– Modulation scheme information for stream 1 (1 bit): x_ms1,1

– Hybrid-ARQ process information (3 bits): x_hap,1, x_hap,2, x_hap,3

– Redundancy version information for stream 1 (2 bits): x_rv1,1, x_rv1,2

– Redundancy version information for stream 2 (2 bits): x_rv2,1, x_rv2,2

– HS-SCCH cyclic sequence number (3 bits): x_hcsn,1, x_hcsn,2, x_hcsn,3

– UE identity (16 bits): x_ue,1, x_ue,2, …, x_ue,16

The following coding/multiplexing steps for HS-SCCH type 5 can be identified:

– multiplexing of HS-SCCH type 5 information (see subclause 4.6E.2)

– CRC attachment for HS-SCCH type 5 (see subclause 4.6E.3);

– channel coding for HS-SCCH type 5 (see subclause 4.6E.4);

– rate matching for HS-SCCH type 5 (see subclause 4.6E.5);

– interleaving for HS-SCCH type 5 (see subclause 4.6E.6);

– mapping to physical channels for HS-SCCH type 5 (see subclauses 4.6E.7 and 4.6E.8).

The general coding/multiplexing flow for HS-SCCH type 5 is shown in Figure 19D.

Figure 19D: Coding and Multiplexing for HS-SCCH type 5

4.6E.1 HS-SCCH type 5 information field mapping

4.6E.1.1 Type flag 1 mapping

The type flag 1 bit x_flag1,1 is mapped as x_flag1,1 =‘1’. The type flag 1 is used to distinguish HS-SCCH type 5 from other types.

4.6E.1.2 Type flag 2 mapping

The type flag 2 bits x_flag2,1 is mapped as x_flag2,1 =‘0’. The type flag 2 is used to distinguish HS-SCCH type 5 from other types.

4.6E.1.3 Timeslot information mapping

The mapping of the time slot information x_ts,1, x_ts,2, … x_ts,5 is performed according to section 4.6.1.2.1.

4.6E.1.4 Modulation scheme information mapping

The mapping of the modulation scheme information for each stream (x_ms1,1 for stream 1 or x_ms2,1 for stream 2 ) is performed according to section 4.6.1.3.

4.6E.1.5 Transport block size offset information mapping

The transport-block size offset information for stream 2 x_tbs2,1, x_tbs2,2, …, x_tbs2,5 is the unsigned binary representation of the transport block size index offset for the stream 2 where x_tbs2,1 is MSB. The transport-block size offset for the stream 2 subtracted from the transport-block size for the stream 1 gives the transport-block size for stream 2.

4.6E.1.6 Transport block size index mapping

The transport-block size information for stream 1 x_tbs1,1, x_tbs1,2, …, x_tbs1,6 is the unsigned binary representation of the transport block size index where x_tbs,1 is MSB. The mapping is performed according to section 4.6.1.8.

4.6E.1.7 HARQ process identifier mapping

The hybrid-ARQ process information x_hap,1, x_hap,2, x_hap,3 is unsigned binary representation of the HARQ process identifier for stream 1 where x_hap,1 is MSB. The HARQ process identifier for stream 2 is , where N_proc is the number of HARQ processes configured by higher layers.

4.6E.1.8 Redundancy version information mapping

The redundancy version (RV) parameters r, s and constellation version parameter b are mapped jointly to produce the value X_rv. X_rv1 is alternatively represented as the sequence for stream 1 x_rv1,1, x_rv1,2 where x_rv1,1 is the MSB. X_rv2 is alternatively represented as the sequence for stream 2 x_rv2,1, x_rv2,2 where x_rv2,1 is the MSB. The mapping of the redundancy version for each stream is performed according to section 4.6C.1.8. If X_rv1= 0 or X_rv2 = 0, the UE shall treat the corresponding transport block as an initial transmission.

4.6E.1.9 HS-SCCH cyclic sequence number

The HS-SCCH cyclic sequence number x_hcsn,1, x_hcsn,2, x_hcsn,3 is mapped such that x_hcsn,1 corresponds to the MSB and x_hcsn,3 to the LSB.

4.6E.1.10 UE identity

The UE identity is the HS-DSCH Radio Network Identifier (H-RNTI) defined in [12]. This is mapped such that x_ue,1 corresponds to the MSB and x_ue,16 to the LSB, cf. [14].

4.6E.2 Multiplexing of HS-SCCH type 5 information

The information carried on the HS-SCCH type 5 is multiplexed onto the bits according to the following rule :

4.6E.3 CRC attachment for HS-SCCH type 5

The sequence of bits , is calculated according to subclause 4.6.3.

4.6E.4 Channel coding for HS-SCCH type 5

Channel coding for the HS-SCCH type 5 shall be done with the general method described in 4.2.3 with the following specific parameters:

The rate 1/3 convolutional coding shall be used for HS-SCCH type 5.

4.6E.5 Rate matching for HS-SCCH type 5

Rate matching for HS-SCCH type 5 shall be done with the general method described in 4.6.5.

4.6E.6 Interleaving for HS-SCCH type 5

Interleaving for HS-SCCH type 5 shall be done with the general method described in 4.2.11.1.

4.6E.7 Physical Channel Segmentation for HS-SCCH type 5

Physical channel segmentation for HS-SCCH type 5 shall be done with the general method described in 4.2.10. The HS-SCCH consists of two physical channels HS-SCCH1 and HS-SCCH2.

4.6E.8 Physical channel mapping for HS-SCCH type 5

Physical channel mapping for the HS-SCCH type 5 shall be done with the general method described in subclause 4.2.12.