`
`Exhibit 1004
`
`Exhibit 1004
`
`ZTE Corporation and ZTE (USA) Inc.
`
`ZTE Corporation and ZTE (USA) Inc.
`
`
`
`3GPP TS 25.212 V5.2.0 (2002-09)
`
`Technical Specification
`
`
`
`3rd Generation Partnership Project;
`Technical Specification Group Radio Access Network;
`Multiplexing and channel coding (FDD)
`(Release 5)
`
`The present document has been developed within the 3rd Generation Partnership Project (3GPP TM) and may be further elaborated for the purposes of 3GPP.
`
`
`The present document has not been subject to any approval process by the 3GPP Organisational Partners and shall not be implemented.
`
`This Specification is provided for future development work within 3GPP only. The Organisational Partners accept no liability for any use of this Specification.
`Specifications and reports for implementation of the 3GPP TM system should be obtained via the 3GPP Organisational Partners' Publications Offices.
`
`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00001
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`
`
`
`Release 5
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`2
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`3GPP TS 25.212 V5.2.0 (2002-09)
`
`Keywords
`UMTS, radio, mux
`
`
`
`
`
`3GPP
`
`Postal address
`
`
`3GPP support office address
`650 Route des Lucioles - Sophia Antipolis
`Valbonne - FRANCE
`Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16
`
`Internet
`http://www.3gpp.org
`
`Copyright Notification
`
`No part may be reproduced except as authorized by written permission.
`The copyright and the foregoing restriction extend to reproduction in all media.
`
`© 2002, 3GPP Organizational Partners (ARIB, CWTS, ETSI, T1, TTA, TTC).
`All rights reserved.
`
`
`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00002
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`Release 5
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`3
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`3GPP TS 25.212 V5.2.0 (2002-09)
`
`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 ........................................................................................ 9
`4.1 General ........................................................................................................................................................................ 9
`4.2 General coding/multiplexing of TrCHs ...................................................................................................................... 9
`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
`Insertion of marked bits in the sequence to be input in first interleaver ............................................................ 21
`4.2.5.2
`1st interleaver operation ....................................................................................................................................... 22
`4.2.5.3 Relation between input and output of 1st interleaving in uplink ........................................................................ 23
`4.2.5.4 Relation between input and output of 1st interleaving in downlink ................................................................... 23
`4.2.6
`Radio frame segmentation .................................................................................................................................. 24
`4.2.6.1 Relation between input and output of the radio frame segmentation block in uplink ....................................... 24
`4.2.6.2 Relation between input and output of the radio frame segmentation block in downlink .................................. 24
`4.2.7
`Rate matching ...................................................................................................................................................... 24
`4.2.7.1 Determination of rate matching parameters in uplink ........................................................................................ 26
`4.2.7.1.1
`Determination of SF and number of PhCHs needed .................................................................................... 26
`4.2.7.2 Determination of rate matching parameters in downlink ................................................................................... 29
`4.2.7.2.1
`Determination of rate matching parameters for fixed positions of TrCHs .................................................. 30
`4.2.7.2.2
`Determination of rate matching parameters for flexible positions of TrCHs .............................................. 33
`4.2.7.3 Bit separation and collection in uplink ............................................................................................................... 35
`4.2.7.3.1
`Bit separation ................................................................................................................................................. 37
`4.2.7.3.2
`Bit collection ................................................................................................................................................. 38
`4.2.7.4 Bit separation and collection in downlink .......................................................................................................... 38
`4.2.7.4.1
`Bit separation ................................................................................................................................................. 39
`4.2.7.4.2
`Bit collection ................................................................................................................................................. 40
`4.2.7.5 Rate matching pattern determination .................................................................................................................. 40
`4.2.8
`TrCH multiplexing .............................................................................................................................................. 41
`4.2.9
`Insertion of discontinuous transmission (DTX) indication bits ......................................................................... 42
`4.2.9.1
`1st insertion of DTX indication bits .................................................................................................................... 42
`4.2.9.2
`2nd insertion of DTX indication bits ................................................................................................................... 42
`4.2.10
`Physical channel segmentation ........................................................................................................................... 43
`4.2.10.1
`Relation between input and output of the physical segmentation block in uplink ...................................... 44
`4.2.10.2
`Relation between input and output of the physical segmentation block in downlink ................................. 44
`4.2.11
`2nd interleaving .................................................................................................................................................... 44
`4.2.12
`Physical channel mapping ................................................................................................................................... 45
`4.2.12.1
`Uplink ............................................................................................................................................................ 45
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`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00003
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`Release 5
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`Downlink ....................................................................................................................................................... 45
`4.2.12.2
`Restrictions on different types of CCTrCHs ...................................................................................................... 46
`4.2.13
`Uplink Dedicated channel (DCH) ................................................................................................................. 46
`4.2.13.1
`Random Access Channel (RACH) ................................................................................................................ 46
`4.2.13.2
`Common Packet Channel (CPCH) ................................................................................................................ 46
`4.2.13.3
`Downlink Dedicated Channel (DCH) ........................................................................................................... 47
`4.2.13.4
`Downlink Shared Channel (DSCH) associated with a DCH ....................................................................... 47
`4.2.13.5
`Broadcast channel (BCH) ............................................................................................................................. 47
`4.2.13.6
`Forward access and paging channels (FACH and PCH) .............................................................................. 47
`4.2.13.7
`4.2.14 Multiplexing of different transport channels into one CCTrCH, and mapping of one CCTrCH onto
`physical channels ........................................................................................................................................... 47
`4.2.14.1
`Allowed CCTrCH combinations for one UE ................................................................................................ 48
`4.2.14.1.1 Allowed CCTrCH combinations on the uplink ............................................................................................ 48
`4.2.14.1.2 Allowed CCTrCH combinations on the downlink ....................................................................................... 48
`4.3
`Transport format detection ....................................................................................................................................... 48
`4.3.1
`Blind transport format detection ......................................................................................................................... 49
`4.3.2
`Transport format detection based on TFCI ........................................................................................................ 49
`4.3.3
`Coding of Transport-Format-Combination Indicator (TFCI) ............................................................................ 49
`4.3.4
`Operation of TFCI in Hard Split Mode .............................................................................................................. 51
`4.3.5
`Mapping of TFCI words ..................................................................................................................................... 52
`4.3.5.1 Mapping of TFCI word in normal mode ............................................................................................................ 52
`4.3.5.2 Mapping of TFCI word in compressed mode..................................................................................................... 52
`4.3.5.2.1
`Uplink compressed mode .............................................................................................................................. 52
`4.3.5.2.2
`Downlink compressed mode ......................................................................................................................... 52
`4.4 Compressed mode ..................................................................................................................................................... 53
`4.4.1
`Frame structure in the uplink .............................................................................................................................. 53
`4.4.2
`Frame structure types in the downlink ............................................................................................................... 54
`4.4.3
`Transmission time reduction method ................................................................................................................. 54
`4.4.3.1 Compressed mode by puncturing ....................................................................................................................... 54
`4.4.3.2 Compressed mode by reducing the spreading factor by 2 ................................................................................. 54
`4.4.3.3 Compressed mode by higher layer scheduling ................................................................................................... 55
`4.4.4
`Transmission gap position .................................................................................................................................. 55
`4.5 Coding for HS-DSCH ............................................................................................................................................... 56
`4.5.1
`CRC attachment for HS-DSCH .......................................................................................................................... 58
`4.5.1a
`Bit scrambling for HS-DSCH ............................................................................................................................. 58
`4.5.2
`Code block segmentation for HS-DSCH ............................................................................................................ 58
`4.5.3
`Channel coding for HS-DSCH ........................................................................................................................... 58
`4.5.4
`Hybrid ARQ for HS-DSCH ................................................................................................................................ 58
`4.5.4.1 HARQ bit separation ........................................................................................................................................... 59
`4.5.4.2 HARQ First Rate Matching Stage ...................................................................................................................... 59
`4.5.4.3 HARQ Second Rate Matching Stage .................................................................................................................. 59
`4.5.4.4 HARQ bit collection ........................................................................................................................................... 60
`4.5.5
`Physical channel segmentation for HS-DSCH ................................................................................................... 61
`4.5.6
`Interleaving for HS-DSCH ................................................................................................................................. 61
`4.5.7
`Constellation re-arrangement for 16 QAM ........................................................................................................ 62
`4.5.8
`Physical channel mapping for HS-DSCH .......................................................................................................... 62
`4.6 Coding for HS-SCCH ............................................................................................................................................... 62
`4.6.1
`Overview ............................................................................................................................................................. 63
`4.6.2
`HS-SCCH information field mapping ................................................................................................................ 64
`4.6.2.1 Redundancy and constellation version coding ................................................................................................... 64
`4.6.2.2 Modulation scheme mapping .............................................................................................................................. 64
`4.6.2.3 Channelization code-set mapping ....................................................................................................................... 64
`4.6.2.4 UE identity mapping ........................................................................................................................................... 65
`The UE identity is the HS-DSCH Radio Network Identifier (H-RNTI) defined in [13]. This is mapped such that
`xue,1 corresponds to the MSB and xue,16 to the LSB, cf. [14].4.6.3
`Multiplexing of
`65
`HS-SCCH information
`CRC attachment for HS-SCCH .......................................................................................................................... 65
`4.6.4
`Channel coding for HS-SCCH ............................................................................................................................ 65
`4.6.5
`Rate matching for HS-SCCH .............................................................................................................................. 65
`4.6.6
`UE specific masking for HS-SCCH ................................................................................................................... 66
`4.6.7
`Physical channel mapping for HS-SCCH ........................................................................................................... 66
`4.6.8
`4.7 Coding for HS-DPCCH ............................................................................................................................................ 66
`
`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00004
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`Release 5
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`Channel coding for HS-DPCCH ......................................................................................................................... 67
`4.7.1
`4.7.1.1 Channel coding for HS-DPCCH HARQ-ACK .................................................................................................. 67
`4.7.1.2 Channel coding for HS-DPCCH channel quality information........................................................................... 67
`4.7.2
`Physical channel mapping for HS-DPCCH ........................................................................................................ 67
`Blind transport format detection .................................................................. 68
`Annex A (informative):
`A.1 Blind transport format detection using fixed positions .......................................................................... 68
`A.1.1
`Blind transport format detection using received power ratio ............................................................................. 68
`A.1.2
`Blind transport format detection using CRC ...................................................................................................... 68
`Compressed mode idle lengths...................................................................... 71
`Annex B (informative):
`B.1
`Idle lengths for DL, UL and DL+UL compressed mode ....................................................................... 71
`Change history ............................................................................................... 73
`Annex C (informative):
`
`
`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00005
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`Release 5
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`3GPP TS 25.212 V5.2.0 (2002-09)
`
`Foreword
`This Technical Specification (TS) has been produced by the 3rd Generation Partnership Project (3GPP).
`
`The contents of the present document are subject to continuing work within the TSG and may change following formal
`TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
`identifying change of release date and an increase in version number as follows:
`
`Version x.y.z
`
`where:
`
`x
`
`the first digit:
`
`1 presented to TSG for information;
`
`2 presented to TSG for approval;
`
`3 or greater indicates TSG approved document under change control.
`
`y
`
`the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
`updates, etc.
`
`z
`
`the third digit is incremented when editorial only changes have been incorporated in the document.
`
`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00006
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`Release 5
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`7
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`3GPP TS 25.212 V5.2.0 (2002-09)
`
`Scope
`1
`The present document describes the characteristics of the Layer 1 multiplexing and channel coding in the FDD mode of
`UTRA.
`
`References
`2
`The following documents contain provisions which, through reference in this text, constitute provisions of the present
`document.
`
` References are either specific (identified by date of publication, edition number, version number, etc.) or
`non-specific.
`
` For a specific reference, subsequent revisions do not apply.
`
` For a non-specific reference, the latest version applies.
`
`[1]
`
`[2]
`
`[3]
`
`[4]
`
`[5]
`
`[6]
`
`[7]
`
`[8]
`
`[9]
`
`[10]
`
`[11]
`
`[12]
`
`[13]
`
`[14]
`
`3GPP TS 25.201: "Physical layer – General Description".
`
`3GPP TS 25.211: "Physical channels and mapping of transport channels onto physical channels
`(FDD)".
`
`3GPP TS 25.213: "Spreading and modulation (FDD)".
`
`3GPP TS 25.214: "Physical layer procedures (FDD)".
`
`3GPP TS 25.215: "Physical layer – Measurements (FDD)".
`
`3GPP TS 25.221: "Physical channels and mapping of transport channels onto physical channels
`(TDD)".
`
`3GPP TS 25.222: "Multiplexing and channel coding (TDD)".
`
`3GPP TS 25.223: "Spreading and modulation (TDD)".
`
`3GPP TS 25.224: "Physical layer procedures (TDD)".
`
`3GPP TS 25.225: "Physical layer – Measurements (TDD)".
`
`3GPP TS 25.302: "Services Provided by the Physical Layer".
`
`3GPP TS 25.402: "Synchronisation in UTRAN, Stage 2".
`
`3GPP TS 25.331: "Radio Resource Control (RRC); Protocol Specification".
`
`ITU-T Recommendation X.691 (12/97) "Information technology - ASN.1 encoding rules:
`Specification of Packed Encoding Rules (PER)"
`
`3
`
`Definitions, symbols and abbreviations
`
`Definitions
`3.1
`For the purposes of the present document, the following terms and definitions apply:
`
`TG: Transmission Gap is consecutive empty slots that have been obtained with a transmission time reduction method.
`The transmission gap can be contained in one or two consecutive radio frames.
`
`TGL: Transmission Gap Length is the number of consecutive empty slots that have been obtained with a transmission
`time reduction method. 0 TGL 14. The CFNs of the radio frames containing the first empty slot of the transmission
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`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00007
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`gaps, the CFNs of the radio frames containing the last empty slot, the respective positions Nfirst and Nlast within these
`frames of the first and last empty slots of the transmission gaps, and the transmission gap lengths can be calculated with
`the compressed mode parameters described in [5].
`
`TrCH number: The transport channel number identifies a TrCH in the context of L1. The L3 transport channel identity
`(TrCH ID) maps onto the L1 transport channel number. The mapping between the transport channel number and the
`TrCH ID is as follows: TrCH 1 corresponds to the TrCH with the lowest TrCH ID, TrCH 2 corresponds to the TrCH
`with the next lowest TrCH ID and so on.
`
`Symbols
`3.2
`For the purposes of the present document, the following symbols apply:
`
`round towards , i.e. integer such that x x < x+1
`round towards -, i.e. integer such that x-1 < x x
`absolute value of x
`
`x
`x
`x
`
`sgn(x)
`
`Nfirst
`Nlast
`Ntr
`Unless otherwise is explicitly stated when the symbol is used, the meaning of the following symbols is:
`
`i
`j
`k
`l
`m
`ni
`p
`r
`I
`Ci
`Fi
`Mi
`Ndata,j
`dataN ,
`cm
`P
`PL
`RMi
`Temporary variables, i.e. variables used in several (sub)clauses with different meaning.
`
`
`
`j
`
`TrCH number
`TFC number
`Bit number
`TF number
`Transport block number
`Radio frame number of TrCH i.
`PhCH number
`Code block number
`Number of TrCHs in a CCTrCH.
`Number of code blocks in one TTI of TrCH i.
`Number of radio frames in one TTI of TrCH i.
`Number of transport blocks in one TTI of TrCH i.
`Number of data bits that are available for the CCTrCH in a radio frame with TFC j.
`Number of data bits that are available for the CCTrCH in a compressed radio frame with TFC j.
`Number of PhCHs used for one CCTrCH.
`Puncturing Limit for the uplink. Signalled from higher layers
`Rate Matching attribute for TrCH i. Signalled from higher layers.
`
`x, X
`y, Y
`z, Z
`
`Abbreviations
`3.3
`For the purposes of the present document, the following abbreviations apply:
`
`ARQ
`BCH
`BER
`BLER
`BS
`CCPCH
`CCTrCH
`
`Automatic Repeat Request
`Broadcast Channel
`Bit Error Rate
`Block Error Rate
`Base Station
`Common Control Physical Channel
`Coded Composite Transport Channel
`
`3GPP
`
`
`
`xx
`
`0
`;1
`
`0
`;1
`
`
`The first slot in the TG, located in the first compressed radio frame if the TG spans two frames.
`The last slot in the TG, located in the second compressed radio frame if the TG spans two frames.
`Number of transmitted slots in a radio frame.
`
`
`
`signum function, i.e.
`
`sgn(
`
`x
`
`)
`
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00008
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`CFN
`CRC
`DCH
`DL
`DPCCH
`DPCH
`DPDCH
`DS-CDMA
`DSCH
`DTX
`FACH
`FDD
`FER
`GF
`HARQ
`HS-DPCCH
`HS-DSCH
`HS-PDSCH
`HS-SCCH
`MAC
`Mcps
`MS
`OVSF
`PCCC
`PCH
`PhCH
`PRACH
`RACH
`RSC
`RV
`RX
`SCH
`SF
`SFN
`SIR
`SNR
`TF
`TFC
`TFCI
`TPC
`TrCH
`TTI
`TX
`UL
`
`Connection Frame Number
`Cyclic Redundancy Check
`Dedicated Channel
`Downlink (Forward link)
`Dedicated Physical Control Channel
`Dedicated Physical Channel
`Dedicated Physical Data Channel
`Direct-Sequence Code Division Multiple Access
`Downlink Shared Channel
`Discontinuous Transmission
`Forward Access Channel
`Frequency Division Duplex
`Frame Error Rate
`Galois Field
`Hybrid Automatic Repeat reQuest
`Dedicated Physical Control Channel (uplink) for HS-DSCH
`High Speed Downlink Shared Channel
`High Speed Physical Downlink Shared Channel
`Shared Control Channel for HS-DSCH
`Medium Access Control
`Mega Chip Per Second
`Mobile Station
`Orthogonal Variable Spreading Factor (codes)
`Parallel Concatenated Convolutional Code
`Paging Channel
`Physical Channel
`Physical Random Access Channel
`Random Access Channel
`Recursive Systematic Convolutional Coder
`Redundancy Version
`Receive
`Synchronisation Channel
`Spreading Factor
`System Frame Number
`Signal-to-Interference Ratio
`Signal to Noise Ratio
`Transport Format
`Transport Format Combination
`Transport Format Combination Indicator
`Transmit Power Control
`Transport Channel
`Transmission Time Interval
`Transmit
`Uplink (Reverse link)
`
`4
`
`Multiplexing, channel coding and interleaving
`
`General
`4.1
`Data stream from/to MAC and higher layers (Transport block / Transport block set) is encoded/decoded to offer
`transport services over the radio transmission link. Channel coding scheme is a combination of error detection, error
`correcting, rate matching, interleaving and transport channels mapping onto/splitting from physical channels.
`
`General coding/multiplexing of TrCHs
`4.2
`This section only applies to the transport channels: DCH, RACH, CPCH, DSCH, BCH, FACH and PCH. Other
`transport channels which do not use the general method are described separately below.
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`Ex. 1004-00009
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`Data arrives to the coding/multiplexing unit in form of transport block sets once every transmission time interval. The
`transmission time interval is transport-channel specific from the set {10 ms, 20 ms, 40 ms, 80 ms}.
`
`The following coding/multiplexing steps can be identified:
`
`- add CRC to each transport block (see subclause 4.2.1);
`
`-
`
`transport block concatenation and code block segmentation (see subclause 4.2.2);
`
`- channel coding (see subclause 4.2.3);
`
`-
`
`-
`
`-
`
`-
`
`-
`
`radio frame equalisation (see subclause 4.2.4);
`
`rate matching (see subclause 4.2.7);
`
`insertion of discontinuous transmission (DTX) indication bits (see subclause 4.2.9);
`
`interleaving (two steps, see subclauses 4.2.5 and 4.2.11);
`
`radio frame segmentation (see subclause 4.2.6);
`
`- multiplexing of transport channels (see subclause 4.2.8);
`
`- physical channel segmentation (see subclause 4.2.10);
`
`- mapping to physical channels (see subclause 4.2.12).
`
`The coding/multiplexing steps for uplink and downlink are shown in figure 1 and figure 2 respectively.
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`3GPP
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`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00010
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`3GPP TS 25.212 V5.2.0 (2002-09)
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`a
`
`
`im1
`
`,
`
`a
`im
`
`2
`
`,
`
`a
`im
`
`3
`
`,
`
`,
`
`a
`imA
`i
`
`
`
`CRC attachment
`
`b
`
`
`im1
`
`,
`
`b
`im
`
`2
`
`,
`
`b
`im
`
`3
`
`,
`
`b
`,
`
`imB
`i
`TrBk concatenation /
`Code block segmentation
`o
`,
`irK
`
`i
`
`o
`ir
`
`1
`
`,
`
`o
`ir
`
`2
`
`,
`
`o
`ir
`
`3
`
`,
`
`
`
`Channel coding
`
`cc ,
`
`
`i
`
`i1
`
`2
`
`,
`
`c
`i
`
`3
`
`,
`
`,
`
`c
`iE
`
`i
`
`
`
`Radio frame equalisation
`
`t
`
`
`
`i1
`
`,
`
`t
`
`i
`
`2
`
`,
`
`t
`
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`1st interleaving
`
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`d
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`iiT
`
` ddd ,,
`
`
`
`
`i
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`2
`
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`
`Radio frame segmentation
`
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`
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`
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`CCTrCH
`Physical channel
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`
`u
`
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`
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`
`p
`
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`
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`
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`
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`
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`2nd interleaving
`
`v
`
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`
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`
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`Physical channel mapping
`
`
`
`PhCH#2
`PhCH#1
`
`Figure 1: Transport channel multiplexing structure for uplink
`
`3GPP
`
`ZTE Corporation and ZTE (USA) Inc.
`Ex. 1004-00011
`
`
`
`
`Release 5
`
`12
`
`3GPP TS 25.212 V5.2.0 (2002-09)
`
`a
`
`
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`
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`CRC attachment
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`b
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`
`3
`
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`
`b
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`TrBk concatenation /
`Code block segmentation
`o
`,
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`
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`
`1
`
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`
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`
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`
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`
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`
`,
`
`Channel coding
`
`Rate matching
`
`Rate
`matching
`
`