1、 ETSI TS 103 311-2 V1.1.1 (2017-02) Integrated broadband cable telecommunication networks (CABLE); Fourth Generation Transmission Systems for Interactive Cable Television Services - IP Cable Modems; Part 2: Physical Layer; DOCSIS3.1 TECHNICAL SPECIFICATION ETSI ETSI TS 103 311-2 V1.1.1 (2017-02)2Ref
2、erence DTS/CABLE-00017-2 Keywords access, broadband, cable, data, DOCSIS, IP, IPCable, modem ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfect
3、ure de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be m
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8、 ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 3
9、11-2 V1.1.1 (2017-02)3Contents Intellectual Property Rights 10g3Foreword . 10g3Modal verbs terminology 10g31 Scope 11g32 References 11g32.1 Normative references . 11g32.2 Informative references 13g33 Definitions, symbols and abbreviations . 13g33.1 Definitions 13g33.2 Symbols 26g33.3 Abbreviations .
10、 27g34 Requirements and Conventions 30g34.1 Requirements 30g34.2 Conventions 30g35 Overview and Functional Assumptions . 31g35.0 Cable Plant Characteristics . 31g35.1 Overview 31g35.2 Functional Assumptions . 32g35.2.1 Equipment Assumptions . 32g35.2.1.1 Frequency Plan 32g35.2.1.2 Compatibility with
11、 Other Services 32g35.2.1.3 Fault Isolation Impact on Other Users 33g35.2.1.4 Cable System Terminal Devices . 33g35.2.2 RF Channel Assumptions . 33g35.2.2.0 Cable Networks Interoperability . 33g35.2.2.1 Transmission Downstream 33g35.2.2.2 Transmission Upstream. 34g35.2.2.2.0 RF Channel Transmission
12、Characteristics . 34g35.2.2.2.1 Availability 35g35.2.3 Transmission Levels . 35g35.2.4 Frequency Inversion . 35g36 PHY Sublayer for SC-QAM. 35g36.1 Scope 35g36.2 Upstream Transmit and Receive 36g36.2.1 Overview 36g36.2.2 Signal Processing Requirements . 36g36.2.3 Modulation Formats 36g36.2.4 R-S Enc
13、ode . 36g36.2.5 Upstream R-S Frame Structure (Multiple Transmit Enabled) 36g36.2.6 Upstream R-S Frame Structure (Multiple Transmit Disabled) . 36g36.2.7 TDMA Byte Interleaver 36g36.2.8 Scrambler (Randomizer) . 36g36.2.9 TCM Encoder . 37g36.2.10 Preamble Prepend . 37g36.2.11 Modulation Rates 37g36.2.
14、12 S-CDMA Framer and Interleaver . 37g36.2.13 S-CDMA Framer 37g36.2.14 Symbol Mapping 37g36.2.15 S-CDMA Spreader 37g36.2.16 Transmit Pre-Equalizer . 37g36.2.17 Spectral Shaping . 37g36.2.18 Relative Processing Delays . 37g3ETSI ETSI TS 103 311-2 V1.1.1 (2017-02)46.2.19 Transmit Power Requirements 37
15、g36.2.20 Burst Profiles 37g36.2.21 Burst Timing Convention . 37g36.2.22 Fidelity Requirements . 38g36.2.23 Upstream Demodulator Input Power Characteristics 38g36.2.24 Upstream Electrical Output from the CM . 38g36.2.25 Upstream CM Transmitter Capabilities 38g36.3 Downstream Transmit 38g36.3.1 Downst
16、ream Protocol . 38g36.3.2 Spectrum Format 38g36.3.3 Scaleable Interleaving to Support Video and High-Speed Data Services . 38g36.3.4 Downstream Frequency Plan 38g36.3.5 DRFI Output Electrical . 38g36.3.6 CMTS or EQAM Clock Generation . 39g36.3.7 Downstream Symbol Clock Jitter for Synchronous Operati
17、on . 39g36.3.8 Downstream Symbol Clock Drift for Synchronous Operation . 39g36.3.9 Timestamp Jitter . 39g36.4 Downstream Receive 39g36.4.1 Downstream Protocol and Interleaving Support . 39g36.4.2 Downstream Electrical Input to the CM . 39g36.4.3 CM BER Performance 39g36.4.4 Downstream Multiple Recei
18、ver Capabilities 39g36.4.5 Non-Synchronous DS Channel Support . 40g37 PHY Sublayer for OFDM. 40g37.1 Scope 40g37.2 Upstream and Downstream Frequency Plan 40g37.2.0 System Spectrum Requirement . 40g37.2.1 Downstream CM Spectrum 40g37.2.2 Downstream CMTS Spectrum 40g37.2.3 Upstream CM Spectrum . 40g37
19、.2.4 Upstream CMTS Spectrum . 41g37.2.5 Channel Band Rules 41g37.2.5.0 OFDM/OFDMA Channel Planning 41g37.2.5.1 Downstream Channel Bandwidth Rules 41g37.2.5.2 Downstream Exclusion Band Rules 42g37.2.5.3 Upstream Channel Bandwidth Rules 43g37.2.5.4 Upstream Exclusion Band Rules . 43g37.3 OFDM Numerolo
20、gy . 43g37.3.1 Downstream OFDM Numerology 43g37.3.2 Upstream OFDMA Numerology 44g37.3.3 Subcarrier Clocking 44g37.4 Upstream Transmit and Receive 45g37.4.1 Overview 45g37.4.2 Signal Processing Requirements . 45g37.4.2.0 OFDMA Frames . 45g37.4.2.1 Framing . 46g37.4.2.2 Forward Error Correction Encodi
21、ng . 47g37.4.2.3 Randomizer and Symbol Mapper 47g37.4.2.4 OFDMA framer and Interleaver 47g37.4.2.5 Pre-Equalization 47g37.4.2.6 IFFT Transformation . 47g37.4.2.7 Cyclic Prefix and Windowing . 47g37.4.3 Time and Frequency Synchronization 48g37.4.3.0 Timing and Frequency Synchronization Requirements 4
22、8g37.4.3.1 Channel Frequency Accuracy . 48g37.4.3.2 Channel Timing Accuracy 48g37.4.3.3 Modulation Timing Jitter 48g37.4.3.4 Upstream Subcarrier Clock Frequency . 48g37.4.4 Forward Error Correction . 49g37.4.4.0 Upstream Codword Parameters . 49g37.4.4.1 FEC Codeword Selection 49g3ETSI ETSI TS 103 31
23、1-2 V1.1.1 (2017-02)57.4.4.1.0 FEC Codeword Size 49g37.4.4.1.1 FEC Codeword Selection Algorithm . 49g37.4.4.2 FEC Encoding . 52g37.4.4.3 Shortening of LDPC Codewords . 54g37.4.5 Data Randomization . 54g37.4.6 Time and Frequency Interleaving and De-interleaving. 54g37.4.7 Mapping of Bits to Cell Word
24、s . 60g37.4.8 Mapping and De-mapping Bits to/from QAM Subcarriers . 61g37.4.8.0 Minislots Structure 61g37.4.8.1 Modulation Formats 61g37.4.8.2 Constellation Mapping 61g37.4.9 REQ Messages 62g37.4.10 IDFT . 62g37.4.11 Cyclic Prefix and Windowing . 63g37.4.11.0 Background and General Requirements 63g3
25、7.4.11.1 Cyclic Prefix and Windowing Algorithm . 65g37.4.11.2 Parameter Optimization 67g37.4.11.2.1 Impacts of Cyclic Prefix and Windowing . 67g37.4.11.2.2 Joint Optimization of Cyclic Prefix and Windowing Parameters 67g37.4.12 Burst Timing Convention . 67g37.4.12.0 OFDMA Transmission 67g37.4.12.1 U
26、pstream Time Reference of an OFDMA Frame . 68g37.4.12.2 Upstream Time Reference of an OFDMA Symbol . 68g37.4.13 Fidelity Requirements . 68g37.4.13.0 CM Transmit Channel Set . 68g37.4.13.1 Maximum Scheduled Minislots 69g37.4.13.2 Transmit Power Requirements 69g37.4.13.2.0 Transmit Power Requirements
27、Overview 69g37.4.13.2.1 Transmit Power Requirements with Multiple Transmit Channel Mode Enabled 70g37.4.13.3 OFDMA Transmit Power Calculations . 73g37.4.13.4 Global Reconfiguration Time for OFDMA Channels . 74g37.4.13.5 OFDMA Fidelity Requirements 75g37.4.13.5.0 TCS Fidelity Requirements . 75g37.4.1
28、3.5.1 Spurious Emissions . 75g37.4.13.5.1.0 Spurious Emissions Requirements . 75g37.4.13.5.2 Spurious Emissions During Burst On/Off Transients 80g37.4.13.5.3 MER Requirements . 80g37.4.14 Cable Modem Transmitter Output Requirements . 82g37.4.15 CMTS Receiver Capabilities 84g37.4.15.1 CMTS Receiver I
29、nput Power Requirements . 84g37.4.15.2 CMTS Receiver Error Ratio Performance in AWGN Channel . 84g37.4.16 Ranging . 85g37.4.16.0 Ranging Procedure 85g37.4.16.1 Initial Ranging . 85g37.4.16.1.1 Initial Ranging Zone 85g37.4.16.1.2 Initial Ranging Signal 86g37.4.16.1.3 Preamble Construction 87g37.4.16.
30、1.4 FEC for the Initial Ranging Data . 87g37.4.16.1.5 Padding and Randomizing . 88g37.4.16.1.6 Symbol Duplicating Cyclic Prefix and Windowing 88g37.4.16.2 Fine Ranging . 89g37.4.16.2.0 Fine Ranging Operations . 89g37.4.16.2.1 Fine Ranging Signal 89g37.4.16.2.2 Transmission of the Fine Ranging Signal
31、 90g37.4.16.2.3 Fine Ranging FEC . 91g37.4.16.2.4 Padding and Randomizing . 92g37.4.16.2.5 Exclusion Bandwidths . 92g37.4.16.2.6 Allowed Values and Ranges for Configuration Parameters 93g37.4.16.2.7 Power and Time Adjustments 94g37.4.16.3 Probing 94g37.4.16.3.0 Probing Usage . 94g37.4.16.3.1 Probing
32、 Frame . 94g3ETSI ETSI TS 103 311-2 V1.1.1 (2017-02)67.4.16.3.2 Probing Symbol Pilots . 94g37.4.16.3.3 PRBS Generation Scheme . 94g37.4.16.3.4 Probing Information 95g37.4.17 Upstream Pilot Structure . 96g37.4.17.0 Edge and Body Minislots 96g37.4.17.1 Pilot Patterns for 8-Subcarrier Minislots . 97g37
33、.4.17.2 Pilot patterns for 16-Subcarrier Minislots . 98g37.4.17.3 Pilot Boosting 100g37.4.17.4 Pilot Patterns for 8-Subcarrier Subslots 100g37.4.17.5 Pilot Patterns for 16-Subcarrier Subslots 101g37.4.17.6 Pilot Modulation . 101g37.4.18 Upstream Pre-Equalization . 101g37.5 Downstream Transmit and Re
34、ceive 102g37.5.1 Overview 102g37.5.2 Signal Processing 103g37.5.2.0 Downstream PHY Processing . 103g37.5.2.1 Forward Error Correction (FEC) Encoding . 105g37.5.2.2 Symbol Mapping to QAM Constellations . 105g37.5.2.3 Scattered Pilot Placeholder Insertion 105g37.5.2.4 Next Codeword Pointer Insertion 1
35、05g37.5.2.5 Interleaving . 105g37.5.2.6 Insertion of Pilots and Exclusion Sub-Bands 105g37.5.2.7 Encoding and Insertion of the PLC . 106g37.5.2.8 IDFT Transformation and Cyclic Prefix Insertion 106g37.5.2.9 Cyclic Prefix and Windowing . 106g37.5.3 Time and Frequency Synchronization 106g37.5.3.0 Timi
36、ng and Frequency Synchronization Requirements 106g37.5.3.1 Downstream sampling rate 106g37.5.3.2 OFDM RF Transmission Synchronization 106g37.5.3.3 Downstream OFDM Symbol Clock Jitter . 106g37.5.3.4 Downstream Timing Acquisition Accuracy 107g37.5.3.5 Downstream Carrier Frequency Acquisition . 107g37.
37、5.3.6 Downstream Acquisition Time . 107g37.5.4 Downstream Forward Error Correction 107g37.5.4.0 FEC Scheme 107g37.5.4.1 Definitions. 108g37.5.4.1.1 Mixed-Modulation Codewords 108g37.5.4.1.2 Codeword vs. FECFrame 108g37.5.4.2 FEC Encoding . 109g37.5.4.2.0 FEC Encoding Requirements and Parameters . 10
38、9g37.5.4.2.1 Outer Encoding (BCH) 109g37.5.4.2.2 Inner Coding (LDPC) 109g37.5.4.2.3 Support for Codeword Shortening . 109g37.5.4.2.3.0 Codeword Shortening for Insufficient Data . 109g37.5.4.3 Bit Interleaving . 111g37.5.4.3.1 Bit Interleaving for Non-Shortened Codewords 111g37.5.4.3.2 Bit Interleavi
39、ng for Non-Shortened Mixed Modulation Codewords . 112g37.5.4.3.3 Bit Interleaving for Shortened Codewords 113g37.5.4.4 Downstream Receiver FEC Processing . 114g37.5.5 Mapping Bits to QAM Constellations 115g37.5.5.0 Bits to QAM Mapping Methods 115g37.5.5.1 Modulation Formats 116g37.5.5.2 Bit-to-Cell
40、Word Demultiplexer . 116g37.5.5.2.1 Non-shortened Codewords 116g37.5.5.2.2 Shortened Codewords and Mixed-Modulation Codewords . 118g37.5.5.3 Randomization 118g37.5.5.4 Cell Word Mapping into I/Q Constellations . 119g37.5.5.5 Transmitter Bit Loading for Symbol Mapping 120g37.5.5.5.0 Overview of Trans
41、mitter Bit Loading for Symbol Mapping . 120g37.5.5.5.1 Bit Loading 121g37.5.5.5.2 NCP Insertion 123g37.5.6 Interleaving and De-interleaving 124g3ETSI ETSI TS 103 311-2 V1.1.1 (2017-02)77.5.6.0 Interleaving and De-interleaving Overview 124g37.5.6.1 Time Interleaving 125g37.5.6.2 Frequency Interleavin
42、g 125g37.5.6.3 Interleaving Impact on Continuous Pilots, Scattered Pilots, PLC and Excluded Spectral Regions 127g37.5.7 IDFT . 128g37.5.7.1 Downstream Transmitter Inverse Discrete Fourier Transform . 128g37.5.7.2 Subcarrier Referencing 130g37.5.8 Cyclic Prefix and Windowing . 130g37.5.9 Fidelity Req
43、uirements . 131g37.5.9.0 Fidelity Requirements Overview 131g37.5.9.1 CMTS Output Electrical Requirements 132g37.5.9.2 Power per Channel for CMTS . 134g37.5.9.3 Out-of-Band Noise and Spurious Requirements for CMTS 135g37.5.10 CMTS Transmitter Output Requirements . 138g37.5.10.0 CMTS Transmitter Outpu
44、t Requirements . 138g37.5.10.1 CMTS Output Electrical Requirements 139g37.5.10.2 Independence of Individual Channel Within the Multiple Channels on a Single RF Port 140g37.5.11 Cable Modem Receiver Input Requirements 141g37.5.12 Cable Modem Receiver 142g37.5.12.0 Cable Modem Receiver Capabilities 14
45、2g37.5.12.1 CM Error Ratio Performance in AWGN Channel 143g37.5.13 Physical Layer Link Channel (PLC) . 143g37.5.13.0 PLC Overview . 143g37.5.13.1 PLC Placement 143g37.5.13.2 PLC Structure 144g37.5.13.3 PLC Preamble Modulation 147g37.5.13.4 PHY Parameters Carried by the PLC 148g37.5.13.5 Mapping of B
46、ytes to a Bit Stream . 149g37.5.13.6 Forward Error Correction code for the PLC 149g37.5.13.7 Block Interleaving of the PLC Subcarriers . 150g37.5.13.8 Randomizing the PLC Subcarriers 152g37.5.13.9 Mapping to 16-QAM Subcarriers . 153g37.5.13.10 PLC Timestamp Reference Point 154g37.5.14 Next Codeword
47、Pointer 155g37.5.14.1 Mapping of Bytes to Bits 155g37.5.14.2 CRC-24-D . 155g37.5.14.2 Forward Error Correction code for the NCP . 157g37.5.14.3 Mapping LDPC Encoded Bits into OFDM Subcarriers 157g37.5.14.4 Placement of NCP Subcarriers 159g37.5.14.5 Randomization and Interleaving of NCP Subcarriers .
48、 159g37.5.15 Downstream Pilot Patterns 160g37.5.15.0 Overview . 160g37.5.15.1 Scattered Pilots 160g37.5.15.1.0 Scattered Pilots Overview . 160g37.5.15.1.1 Scattered Pilot Pattern for 4K FFT 160g37.5.15.1.2 Scattered Pilot Pattern for 8K FFT 162g37.5.15.2 Continuous Pilots 165g37.5.15.2.0 Continuous
49、Pilots Overview 165g37.5.15.2.1 Predefined Continuous Pilots Around the PLC . 165g37.5.15.2.2 Continuous Pilot Placement Defined by PLC Message . 166g37.5.15.3 Pilot Modulation . 168g37.5.15.4 Pilot Boosting 169g38 PHY-MAC Convergence . 169g38.1 Scope 169g38.2 Upstream 169g38.2.1 Profiles 169g38.2.2 Upstream Subcarrier Numbering Conventions . 169g38.2.3 Minislots . 169g38.2.3.0 Minislots Overview . 169g38.2.3.1 Minislot Parameters 170g38.2.3.2 Minislot Structure . 170g3ETSI ETSI TS 103 311-2 V1.1.1 (2017-02)88.2.3.2.1 Number of OFDM Symbols per Minislot 170g38.2.3.2.2 Number o
