4.6I Coding/Multiplexing for HS-SCCH type 9 (1.28 Mcps TDD only)

25.2223GPPMultiplexing and channel coding (TDD)Release 17TS

HS-SCCH shall be of type 9 when the following conditions are true:

– the UE is configured in MIMO mode, and

– the variable MIMO SF mode for HS-PDSCH dual stream is SF1/SF16.

HS-SCCH type 9 is used for dual stream transmission in MIMO mode. The following information is transmitted by means of the HS-SCCH type 9 physical channels.

– Channelisation-code-set information (4 bits): xccs,1, xccs,2…, xccs,4

– Transport-block size information for stream 1 (6 bits): xtbs1,1, xtbs1,2, …, xtbs1,6

– Modulation scheme information for stream 1 (1 bit): xms1,1

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

– Redundancy version information for stream 1 (2 bits): xrv1,1, xrv1,2

– Transport-block size information for stream 2 (6 bits): xtbs2,1, xtbs2,2, …, xtbs2,6

– Modulation scheme information for stream 2 (1 bit): xms2,1

– Redundancy version information for stream 2 (2 bits): xrv2,1, xrv2,2

– Hybrid-ARQ process information (4 bits): xhap,1, xhap,2, xhap,3, xhap,4,

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

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

The following coding/multiplexing steps for HS-SCCH type 9 can be identified:

– multiplexing of HS-SCCH type 9 information (see subclause 4.6I.2)

– CRC attachment for HS-SCCH type 9 (see subclause 4.6I.3);

– channel coding for HS-SCCH type 9 (see subclause 4.6I.4);

– rate matching for HS-SCCH type 9 (see subclause 4.6I.5);

– interleaving for HS-SCCH type 9 (see subclause 4.6I.6);

– mapping to physical channels for HS-SCCH type 9 (see subclauses 4.6I.7 and 4.6I.8).

The general coding/multiplexing flow for HS-SCCH type 9 is shown in Figure 19H.

Figure 19H: Coding and Multiplexing for HS-SCCH type 9

4.6I.1 HS-SCCH type 9 information field mapping

4.6I.1.1 Channelisation code set information mapping

HS-PDSCH channelisation codes are allocated contiguously from a signalled start code to a signalled stop code, and the allocation includes both the start and stop code. The start code kstart is signalled by the bits xccs,1, xccs,2 and the stop code kstop by the bits xccs,3, xccs,4. The mapping in Table 16 C below applies.

If a value of kstart = 5 and kstop = 4 is signalled, a spreading factor of SF=1 shall be used for the HS-PDSCH resources. Other than this case, kstart > kstop are not used.

Table 16C: Channelisation code set information mapping

kstart

xccs,1

xccs,2

kstop

xccs,3

xccs,4

1

0

0

4

0

0

5

0

1

8

0

1

9

1

0

12

1

0

13

1

1

16

1

1

If NON_RECTANGULAR_RESOURCE_ALLOCATION_STATUS is FALSE, HS-PDSCH channelization codes of all the allocated timeslots are indicated by channelisation-code-set information field.

If NON_RECTANGULAR_Resource_ ALLOCATION_STATUS is TRUE and non-rectangular resource specific timeslot set is not configured via higher layer signalling, the specific timeslot refers to the timeslot with the maximal timeslot index among all the timeslots scheduled to the UE and HS-PDSCH channelisation codes of the specific timeslot is indicated by channelisation-code set information field. The HS-PDSCH channelisation codes of timeslot 0 are signalled via higher layer signalling if timeslot 0 is scheduled to the UE. The HS-PDSCH channelisation codes of other scheduled timeslots are predefined, i.e. the entire resource of each timeslot is scheduled to the UE with SF=1.

If NON_RECTANGULAR_RESOURCE_ALLOCATION_STATUS is TRUE and non-rectangular resource specific timeslot set is configured via higher layer signalling, HS-PDSCH channelisation codes in the specific timeslot is indicated by channelisation-code set information field. The HS-PDSCH channelisation codes of other scheduled timeslots are predefined, i.e. the entire resource of the timeslot is scheduled to the UE with SF=1.

4.6I.1.2 Transport block size offset information mapping

The transport-block size information for stream 1 xtbs1,1, xtbs1,2, …, xtbs1,6 is the unsigned binary representation of the transport block size index where xtbs1,1 is MSB. The mapping is performed according to section 4.6.1.8.

The transport-block size information for stream 2 xtbs2,1, xtbs2,2, …, xtbs2,6 is the unsigned binary representation of the transport block size index where xtbs2,1 is MSB. The mapping is performed according to section 4.6.1.8.

4.6I.1.3 Modulation scheme information mapping

The mapping of the modulation scheme information for each stream (xms1,1 for stream 1 or xms2,1 for stream 2 ) is performed according to section 4.6.1.3.

4.6I.1.4 Timeslot information mapping

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

4.6I.1.5 Redundancy version information mapping

The mapping of the redundancy version for each stream ( xrv1,1, xrv1,2 for stream 1 and xrv2,1, xrv2,2 for stream 2 ) is performed according to section 4.6E.1.8.

4.6I.1.6 HARQ process identifier mapping

The hybrid-ARQ process information xhap,1, xhap,2, xhap,3, xhap,4 is unsigned binary representation of the HARQ process identifier where xhap,1 is MSB.

For dual stream transmission, two transport blocks are transmitted on the associated HS-PDSCH(s), and the mapping relationship between the hybrid-ARQ processes and the transport blocks is such that when the HARQ-process with identifier is mapped to the transport block on stream 1, the HARQ-process with the identifier given by shall be mapped to the transport block on stream 2, where Nproc is the number of HARQ processes configured by higher layers.

4.6I.1.9 HS-SCCH cyclic sequence number

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

4.6I.1.10 UE identity

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

4.6I.2 Multiplexing of HS-SCCH type 9 information

The information carried on the HS-SCCH type 9 is multiplexed onto the bits according to the following rule :

4.6I.3 CRC attachment for HS-SCCH type 9

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

4.6I.4 Channel coding for HS-SCCH type 9

Channel coding for the HS-SCCH type 9 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 9.

4.6I.5 Rate matching for HS-SCCH type 9

Rate matching for HS-SCCH type 9 shall be done with the general method described in 4.6.5.

4.6I.6 Interleaving for HS-SCCH type 9

Interleaving for HS-SCCH type 9 shall be done with the general method described in 4.2.11.1.

4.6I.7 Physical Channel Segmentation for HS-SCCH type 9

Physical channel segmentation for HS-SCCH type 9 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.

4.6I.8 Physical channel mapping for HS-SCCH type 9

Physical channel mapping for the HS-SCCH type 9 shall be done with the general method described in subclause 4.2.12.