4.6B Coding/Multiplexing for HS-SCCH type 2 (1.28 Mcps TDD only)

25.2223GPPMultiplexing and channel coding (TDD)Release 17TS

HS-SCCH shall be of type 2 when any of the following conditions is met:

– the variable HS_DSCH_SPS_STATUS is TRUE, and UE is not configured in MIMO mode;

– the variable HS_DSCH_SPS_STATUS is TRUE, and UE is configured in MIMO mode while the variable MIMO SF mode for HS-PDSCH dual stream is SF1.

HS-SCCH type 2 is used to allocate semi-persistent HS-PDSCH resources for the initial transmissions. The following information is transmitted by means of the HS-SCCH type 2 physical channels.

– Type flag 1 (2 bits): xflag1,1, xflag1,2

– Resource repetition pattern index (2bits): xrrpi,1, xrrpi,2

– Type flag 2 (2 bits): xflag2,1, xflag2,2

– Transport-block size information (2 bits): xtbs,1, xtbs,2

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

– Channelisation-code-set information (6 bits): xccs,1, xccs,2, …, xccs, 6

– Modulation scheme information (1 bit): xms,1

– HS-SICH indicator (2bits): xHI,1, xHI,2

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

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

– Redundancy and constellation version (0 bit): Xrv =0 (see subclause 4.6.1.4)

– Reserved (5 bits): xres,1, xres,2,… , xres,5

For an HS-SCCH order type A,

– xflag1,1, xflag1,2, xrrpi,1, xrrpi,2 , xflag2,1, xflag2,2, xtbs,1, xtbs,2 are reserved

– xts,1, xts,2, …, xts,5 shall be set to ‘00000’

– xccs,1, xccs,2, xccs,3 shall be set to xodt,1, xodt,2, xodt,3

– xccs,4, xccs,5, xccs,6, xms,1, xHI,1, xHI,2, xhcsn,1, xhcsn,2, xhcsn,3, xres,1, xres,2, xres,3 , xres,4, xres,5 are reserved

where xodt,1, xodt,2, xodt,3 are defined in subclause 4.6A.

The following coding/multiplexing steps for HS-SCCH type 2 can be identified:

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

– CRC attachment for HS-SCCH type 2 (see subclause 4.6B.3);

– channel coding for HS-SCCH type 2 (see subclause 4.6B.4);

– rate matching for HS-SCCH type 2 (see subclause 4.6B.5);

– interleaving for HS-SCCH type 2 (see subclause 4.6B.6);

– mapping to physical channels for HS-SCCH type 2 (see subclauses 4.6B.7 and 4.6B.8).

The general coding/multiplexing flow for HS-SCCH type 2 is shown in Figure 19A.

Figure 19A: Coding and Multiplexing for HS-SCCH type 2

4.6B.1 HS-SCCH type 2 information field mapping

4.6B.1.1 Type flag 1 mapping

The type flag 1 xflag1,1, xflag1,2 are mapped such that xflag1,1 =‘1’corresponds to the MSB and xflag1,2 =‘1’ to the LSB. The type flag 1 is used to distinguish HS-SCCH type 2 from other types.

4.6B.1.2 Resource repetition pattern index mapping

The resource repetition pattern index xrrpi,1, xrrpi,2 is the unsigned binary representation of a reference to one of repetition patterns of the assigned semi-persistent HS-PDSCH resources configured by higher layers. The resource repetition pattern index xrrpi,1, xrrpi,2 are mapped such that xrrpi,1corresponds to the MSB and xrrpi,2 to the LSB. The mapping of xrrpi,1 xrrpi,2 =’00’ is not used.

xrrpi,1, xrrpi,2

Resource repetition pattern index as signalled in the variable HS_DSCH_SPS_PARAMS[12]

’01’

1st entry

’10’

2nd entry

’11’

3rd entry

4.6B.1.3 Type flag 2 mapping

The type flag 2 xflag2,1, xflag2,2 are mapped such that xflag2,1 =‘1’corresponds to the MSB and xflag2,2 =‘0’ to the LSB. The type flag 2 is used to distinguish HS-SCCH type 2 from other types.

4.6B.1.4 Transport block size index mapping

The transport-block size information xtbs,1, xtbs,2 is the unsigned binary representation of a reference to one of the four Transport-block sizes configured by higher layers.

xtbs,1, xtbs,2

Transport Block size as signalled in the variable HS_DSCH_SPS_PARAMS[12]

’00’

1st entry

’01’

2nd entry

’10’

3rd entry

’11’

4th entry

4.6B.1.5 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.

4.6B.1.6 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, xccs,3 and the stop code kstop by the bits xccs,4, xccs,5, xccs,6. The mapping in Table 16B below applies.

If a value of kstart = 9 and kstop = 6 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 16B: Channelisation code set information mapping

kstart

xccs,1

xccs,2

xccs,3

kstop

xccs,4

xccs,5

xccs,6

1

0

0

0

2

0

0

0

3

0

0

1

4

0

0

1

5

0

1

0

6

0

1

0

7

0

1

1

8

0

1

1

9

1

0

0

10

1

0

0

11

1

0

1

12

1

0

1

13

1

1

0

14

1

1

0

15

1

1

1

16

1

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.

4.6B.1.7 Modulation scheme information mapping

The mapping of the modulation scheme information xms,1 is performed according to table 17 in section 4.6.1.3.

4.6B.1.8 HS-SICH indicator mapping

The HS-SICH indicator consists of 2 bits used to indicate the UE which HS-SICH will be used to convey the CQI and the acknowledgement indicator for the received data on the semi-persistent HS-PDSCH resources. The bits xHI,1, xHI,2 are mapped such that xHI,1 corresponds to the MSB and xHI,2 to the LSB.

xHI,1, xHI,2

HS-SICH indicator as signalled in the variable HS_DSCH_SPS_PARAMS[12]

’00’

1st entry

’01’

2nd entry

’10’

3rd entry

’11’

4th entry

4.6B.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.

4.6B.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].

4.6B.2 Multiplexing of HS-SCCH type 2 information

The information carried on the HS-SCCH type 2 is multiplexed onto the bits according to the following rule :

4.6B.3 CRC attachment for HS-SCCH type 2

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

4.6B.4 Channel coding for HS-SCCH type 2

Channel coding for the HS-SCCH type 2 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 2.

4.6B.5 Rate matching for HS-SCCH type 2

Rate matching for HS-SCCH type 2 shall be done with the general method described in 4.6.5.

4.6B.6 Interleaving for HS-SCCH type 2

Interleaving for HS-SCCH type 2 shall be done with the general method described in 4.2.11.1.

4.6B.7 Physical Channel Segmentation for HS-SCCH type 2

Physical channel segmentation for HS-SCCH type 2 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.

4.6B.8 Physical channel mapping for HS-SCCH type 2

Physical channel mapping for the HS-SCCH type 2 shall be done with the general method described in subclause 4.2.12.