samblue 2006-8-7 20:18
25212-700-Multiplexing and channel coding (FDD)
25212-700-Multiplexing and channel coding (FDD).pdf
Contents
Foreword...........................................................................................................................................................6
1 Scope.......................................................................................................................................................7
2 References...............................................................................................................................................7
3 Definitions, symbols and abbreviations...................................................................................................7
3.1 Definitions........................................................................................................................................................7
3.2 Symbols............................................................................................................................................................8
3.3 Abbreviations....................................................................................................................................................8
4 Multiplexing, channel coding and interleaving......................................................................................10
4.1 General............................................................................................................................................................10
4.2 General coding/multiplexing of TrCHs...........................................................................................................10
4.2.1 CRC attachment........................................................................................................................................13
4.2.1.1 CRC Calculation..................................................................................................................................13
4.2.1.2 Relation between input and output of the CRC attachment block........................................................13
4.2.2 Transport block concatenation and code block segmentation....................................................................14
4.2.2.1 Concatenation of transport blocks........................................................................................................14
4.2.2.2 Code block segmentation.....................................................................................................................14
4.2.3 Channel coding..........................................................................................................................................15
4.2.3.1 Convolutional coding..........................................................................................................................15
4.2.3.2 Turbo coding.......................................................................................................................................16
4.2.3.2.1 Turbo coder....................................................................................................................................16
4.2.3.2.2 Trellis termination for Turbo coder.................................................................................................17
4.2.3.2.3 Turbo code internal interleaver.......................................................................................................17
4.2.3.3 Concatenation of encoded blocks.........................................................................................................21
4.2.4 Radio frame size equalisation...................................................................................................................21
4.2.5 1st interleaving...........................................................................................................................................21
4.2.5.1 Void.....................................................................................................................................................21
4.2.5.2 1st interleaver operation.......................................................................................................................21
4.2.5.3 Relation between input and output of 1st interleaving in uplink...........................................................22
4.2.5.4 Relation between input and output of 1st interleaving in downlink......................................................23
4.2.6 Radio frame segmentation.........................................................................................................................23
4.2.6.1 Relation between input and output of the radio frame segmentation block in uplink...........................23
4.2.6.2 Relation between input and output of the radio frame segmentation block in downlink......................23
4.2.7 Rate matching............................................................................................................................................23
4.2.7.1 Determination of rate matching parameters in uplink..........................................................................25
4.2.7.1.1 Determination of SF and number of PhCHs needed.......................................................................25
4.2.7.2 Determination of rate matching parameters in downlink......................................................................28
4.2.7.2.1 Determination of rate matching parameters for fixed positions of TrCHs......................................28
4.2.7.2.2 Determination of rate matching parameters for flexible positions of TrCHs..................................30
4.2.7.3 Bit separation and collection in uplink.................................................................................................32
4.2.7.3.1 Bit separation.................................................................................................................................34
4.2.7.3.2 Bit collection..................................................................................................................................34
4.2.7.4 Bit separation and collection in downlink............................................................................................35
4.2.7.4.1 Bit separation.................................................................................................................................36
4.2.7.4.2 Bit collection..................................................................................................................................36
4.2.7.5 Rate matching pattern determination....................................................................................................37
4.2.8 TrCH multiplexing....................................................................................................................................38
4.2.9 Insertion of discontinuous transmission (DTX) indication bits..................................................................38
4.2.9.1 1st insertion of DTX indication bits......................................................................................................38
4.2.9.2 2nd insertion of DTX indication bits.....................................................................................................39
4.2.10 Physical channel segmentation...................................................................................................................40
4.2.10.1 Relation between input and output of the physical segmentation block in uplink................................40
4.2.10.2 Relation between input and output of the physical segmentation block in downlink...........................40
4.2.11 2nd interleaving..........................................................................................................................................40
4.2.12 Physical channel mapping.........................................................................................................................41
4.2.12.1 Uplink..................................................................................................................................................42 3GPP
Release 7T 4 3GPP TS 25.212 V7.0.0 (2006-03)
4.2.12.2 Downlink.............................................................................................................................................42
4.2.13 Restrictions on different types of CCTrCHs..............................................................................................42
4.2.13.1 Uplink Dedicated channel (DCH)........................................................................................................42
4.2.13.2 Random Access Channel (RACH).......................................................................................................42
4.2.13.3 Void.....................................................................................................................................................43
4.2.13.4 Downlink Dedicated Channel (DCH)...................................................................................................43
4.2.13.5 Void.....................................................................................................................................................43
4.2.13.6 Broadcast channel (BCH).....................................................................................................................43
4.2.13.7 Forward access and paging channels (FACH and PCH)......................................................................43
4.2.13.8 High Speed Downlink Shared Channel (HS-DSCH) associated with a DCH......................................43
4.2.13.9 Enhanced Dedicated Channel (E-DCH)...............................................................................................43
4.2.14 Multiplexing of different transport channels into one CCTrCH, and mapping of one CCTrCH onto physical channels......................................................................................................................................44
4.2.14.1 Allowed CCTrCH combinations for one UE........................................................................................44
4.2.14.1.1 Allowed CCTrCH combinations on the uplink...............................................................................44
4.2.14.1.2 Allowed CCTrCH combinations on the downlink..........................................................................44
4.3 Transport format detection..............................................................................................................................45
4.3.1 Blind transport format detection................................................................................................................45
4.3.1a Single transport format detection...............................................................................................................46
4.3.2 Transport format detection based on TFCI................................................................................................46
4.3.3 Coding of Transport-Format-Combination Indicator (TFCI).....................................................................46
4.3.4 Void...........................................................................................................................................................47
4.3.5 Mapping of TFCI words............................................................................................................................48
4.3.5.1 Mapping of TFCI word in normal mode..............................................................................................48
4.3.5.2 Mapping of TFCI word in compressed mode.......................................................................................48
4.3.5.2.1 Uplink compressed mode................................................................................................................48
4.3.5.2.2 Downlink compressed mode...........................................................................................................48
4.4 Compressed mode...........................................................................................................................................49
4.4.1 Frame structure in the uplink.....................................................................................................................49
4.4.2 Frame structure types in the downlink.......................................................................................................50
4.4.2A Frame structure in the downlink for F-DPCH............................................................................................50
4.4.3 Transmission time reduction method.........................................................................................................50
4.4.3.1 Void.....................................................................................................................................................50
4.4.3.2 Compressed mode by reducing the spreading factor by 2....................................................................50
4.4.3.3 Compressed mode by higher layer scheduling.....................................................................................51
4.4.4 Transmission gap position.........................................................................................................................51
4.4.5 Transmission gap position for E-DCH.......................................................................................................52
4.4.5.1 E-DPDCH Transmission Gap Position during Initial Transmissions...................................................52
4.4.5.2 E-DPDCH Transmission Gap Position during Retransmissions..........................................................53
4.4.5.3 E-DPCCH Transmission Gap Position.................................................................................................53
4.5 Coding for HS-DSCH.....................................................................................................................................53
4.5.1 CRC attachment for HS-DSCH..................................................................................................................54
4.5.1a Bit scrambling for HS-DSCH....................................................................................................................55
4.5.2 Code block segmentation for HS-DSCH....................................................................................................55
4.5.3 Channel coding for HS-DSCH...................................................................................................................55
4.5.4 Hybrid ARQ for HS-DSCH.......................................................................................................................55
4.5.4.1 HARQ bit separation...........................................................................................................................56
4.5.4.2 HARQ First Rate Matching Stage........................................................................................................56
4.5.4.3 HARQ Second Rate Matching Stage....................................................................................................56
4.5.4.4 HARQ bit collection............................................................................................................................57
4.5.5 Physical channel segmentation for HS-DSCH...........................................................................................58
4.5.6 Interleaving for HS-DSCH.........................................................................................................................58
4.5.7 Constellation re-arrangement for 16 QAM................................................................................................59
4.5.8 Physical channel mapping for HS-DSCH..................................................................................................59
4.6 Coding for HS-SCCH.....................................................................................................................................59
4.6.1 Overview...................................................................................................................................................60
4.6.2 HS-SCCH information field mapping........................................................................................................61
4.6.2.1 Redundancy and constellation version coding......................................................................................61
4.6.2.2 Modulation scheme mapping................................................................................................................61
4.6.2.3 Channelization code-set mapping.........................................................................................................61
4.6.2.4 UE identity mapping............................................................................................................................61
4.6.2.5 HARQ process identifier mapping.......................................................................................................62 3GPP
Release 7T 5 3GPP TS 25.212 V7.0.0 (2006-03)
4.6.2.6 Transport block size index mapping.....................................................................................................62
4.6.3 Multiplexing of HS-SCCH information.....................................................................................................62
4.6.4 CRC attachment for HS-SCCH..................................................................................................................62
4.6.5 Channel coding for HS-SCCH...................................................................................................................62
4.6.6 Rate matching for HS-SCCH.....................................................................................................................63
4.6.7 UE specific masking for HS-SCCH...........................................................................................................63
4.6.8 Physical channel mapping for HS-SCCH...................................................................................................63
4.7 Coding for HS-DPCCH..................................................................................................................................63
4.7.1 Channel coding for HS-DPCCH................................................................................................................64
4.7.1.1 Channel coding for HS-DPCCH HARQ-ACK.....................................................................................64
4.7.1.2 Channel coding for HS-DPCCH channel quality information..............................................................64
4.7.2 Physical channel mapping for HS-DPCCH................................................................................................65
4.8 Coding for E-DCH..........................................................................................................................................65
4.8.1 CRC attachment for E-DCH......................................................................................................................66
4.8.2 Code block segmentation for E-DCH........................................................................................................66
4.8.3 Channel coding for E-DCH........................................................................................................................67
4.8.4 Physical layer HARQ functionality and rate matching for E-DCH............................................................67
4.8.4.1 Determination of SF and number of PhCHs needed.............................................................................67
4.8.4.2 HARQ bit separation...........................................................................................................................68
4.8.4.3 HARQ Rate Matching Stage................................................................................................................68
4.8.4.4 HARQ bit collection............................................................................................................................69
4.8.5 Physical channel segmentation for E-DCH................................................................................................69
4.8.6 Interleaving for E-DCH.............................................................................................................................69
4.8.7 Physical channel mapping for E-DCH.......................................................................................................69
4.9 Coding for E-DPCCH.....................................................................................................................................70
4.9.1 Overview...................................................................................................................................................70
4.9.2 E-DPCCH information field mapping........................................................................................................70
4.9.2.1 Information field mapping of E-TFCI..................................................................................................70
4.9.2.2 Information field mapping of retransmission sequence number...........................................................70
4.9.2.3 Information field mapping of the "Happy" bit......................................................................................71
4.9.3 Multiplexing of E-DPCCH information.....................................................................................................71
4.9.4 Channel coding for E-DPCCH...................................................................................................................71
4.9.5 Physical channel mapping for E-DPCCH..................................................................................................71
4.10 Coding for E-AGCH.......................................................................................................................................72
4.10.1 Overview...................................................................................................................................................72
4.10.1A E-AGCH information field mapping..................................................................................................................72
4.10.1A.1 Information field mapping of the Absolute Grant Value.................................................................................72
4.10.1A.2 Information field mapping of the Absolute Grant Scope.................................................................................73
4.10.1B Multiplexing of E-AGCH information................................................................................................................73
4.10.2 CRC attachment for E-AGCH....................................................................................................................74
4.10.3 Channel coding for E-AGCH.....................................................................................................................74
4.10.4 Rate matching for E-AGCH.......................................................................................................................74
4.10.5 Physical channel mapping for E-AGCH....................................................................................................74
4.11 Mapping for E-RGCH Relative Grant.............................................................................................................74
4.11.1 Overview...................................................................................................................................................74
4.11.2 Relative Grant mapping............................................................................................................................74
4.12 Mapping for E-HICH ACK/NACK.................................................................................................................74
4.12.1 Overview...................................................................................................................................................74
4.12.2 ACK/NACK mapping...............................................................................................................................75
Annex A (informative): Blind transport format detection..................................................................76
A.1 Blind transport format detection using fixed positions..........................................................................76
A.1.1 Blind transport format detection using received power ratio...........................................................................76
A.1.2 Blind transport format detection using CRC....................................................................................................76
Annex B (informative): Compressed mode idle lengths......................................................................79
B.1 Idle lengths for DL, UL and DL+UL compressed mode for DPCH......................................................79
Annex C (informative): Change history...............................................................................................81