ETSI TS 103 859 V12.0.1 (2024-04)

Publicly Available Specification (PAS); O-RAN Fronthaul Control, User and Synchronization Plane Specification v12.01; (O-RAN.WG4.CUS.0-R003-v12.01)

RTS/MSG-001142

General Information

• Status: Not Published
• Technical Committee: MSG - Mobile Standards Group
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Due Date: 24-Apr-2024
• Completion Date: 23-Apr-2024

Standards Content (Sample)

TECHNICAL SPECIFICATION
Publicly Available Specification (PAS);
O-RAN Fronthaul Control, User and Synchronization Plane
Specification v12.01;
(O-RAN.WG4.CUS.0-R003-v12.01)
CAUTION
The present document has been submitted to ETSI as a PAS produced by O-RAN Alliance and
approved by the ETSI Technical Committee Mobile Standards Group (MSG).
ETSI had been assigned all the relevant copyrights related to the document O-RAN.WG4.CUS.0-R003-v12.01 on an "as is
basis". Consequently, to the fullest extent permitted by law, ETSI disclaims all warranties whether express, implied, statutory or
otherwise including but not limited to merchantability, non-infringement of any intellectual property rights of third parties. No
warranty is given about the accuracy and the completeness of the content of the present document.

2 ETSI TS 103 859 V12.0.1 (2024-04)

Reference
RTS/MSG-001142
Keywords
control, front haul, management plane, PAS

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ETSI
3 ETSI TS 103 859 V12.0.1 (2024-04)
Contents
Intellectual Property Rights . 15
Foreword . 15
Modal verbs terminology . 15
1 Scope . 16
2 References . 16
2.1 Normative references . 16
2.2 Informative references . 18
3 Definition of terms, symbols and abbreviations . 19
3.1 Terms . 19
3.2 Symbols . 21
3.3 Abbreviations . 21
3.4 Document conventions . 22
3.4.1 Terminologies . 22
3.4.2 Fields and bitmasks in messages . 23
4 Architecture & requirements . 24
4.1 Architectural aspects . 24
4.1.1 Architectural entities . 24
4.2 Functional split . 24
4.2.1 Introduction. 24
4.2.2 Split 7-2x (DL) . 25
4.2.2.1 Description . 25
4.2.2.2 Benefits and justification (informative) . 27
4.2.3 Split 7-2x (UL) . 28
4.2.3.1 Description . 28
4.2.3.2 Benefits and justification (informative) . 29
4.3 Data flows . 29
4.4 Latency requirements . 31
4.4.1 Introduction. 31
4.4.2 Timing parameter relationships . 32
4.4.2.1 General . 32
4.4.2.2 O-DU Transmission Window. 33
4.4.3 U-Plane/ C-Plane timing . 34
4.4.4 Computed latency methods . 39
4.4.4.1 Introduction . 39
4.4.4.2 Fronthaul timing domain . 41
4.4.4.3 Defined Transport method . 42
4.4.4.4 Measured Transport method. 43
4.4.5 Latency categories for O-DU with dynamic timing advance . 46
4.4.6 Latency categories for O-DU with fixed timing advance . 48
4.4.7 Non Delay-managed U-Plane traffic . 49
4.5 Reception window monitoring . 50
4.6 Transmission windows . 51
4.6.1 Normal transmission . 51
4.6.2 Uniformly distributed transmission . 51
4.6.3 Ordered transmission . 51
4.6.4 Scheduled transmission . 52
4.7 O-RU external antenna delay handling . 53
4.7.1 Introduction. 53
4.7.2 Minimal O-DU impact method (defined transport method) . 53
4.7.2.1 Description . 53
4.7.2.2 Minimal O-DU impact method - Example . 54
4.8 UL frame timing to DL frame . 57
4.8.1 Overview . 57
4.8.2 Carrier types and default values of n-ta-offset . 58
ETSI
4 ETSI TS 103 859 V12.0.1 (2024-04)
5 Transport & Protocol Architecture . 59
5.1 Transport encapsulation types . 59
5.1.1 Ethernet encapsulation . 59
5.1.2 IP/UDP encapsulation . 59
5.1.3 Transport headers . 60
5.1.3.1 Introduction . 60
5.1.3.2 eCPRI transport header . 60
5.1.3.2.1 Overview . 60
5.1.3.2.2 ecpriVersion (eCPRI protocol revision) . 61
5.1.3.2.3 ecpriReserved (eCPRI reserved). 61
5.1.3.2.4 ecpriConcatenation (eCPRI concatenation indicator) . 61
5.1.3.2.5 ecpriMessage (eCPRI message type) . 61
5.1.3.2.6 ecpriPayload (eCPRI payload size) . 61
5.1.3.2.7 ecpriRtcid / ecpriPcid (real time control data / IQ data transfer message series identifier) . 62
5.1.3.2.8 ecpriSeqid (message identifier) . 64
5.1.3.3 IEEE 1914.3 transport header . 66
5.1.3.3.1 Overview . 66
5.1.3.3.2 RoEsubType (sub type / message type) . 66
5.1.3.3.3 RoEflowID (flow identifier) . 67
5.1.3.3.4 RoElength (length) . 67
5.1.3.3.5 RoEorderInfo (order information) . 67
5.2 Protocol architecture. 68
5.2.1 C-Plane . 68
5.2.2 U-Plane . 68
5.2.3 S-Plane . 69
5.3 Quality of service . 69
5.4 Data flow identification . 70
5.5 Fragmentation . 70
5.5.1 Introduction. 70
5.5.2 Application layer fragmentation . 70
5.5.3 Radio transport layer (eCPRI or IEEE-1914.3) fragmentation . 71
5.5.4 Fragmentation considerations . 71
6 Security. 73
6.1 General . 73
7 C-Plane Protocol . 74
7.1 General . 74
7.1.1 C-Plane transport . 74
7.2 Elementary procedures . 74
7.2.1 Scheduling and beamforming commands transfer procedure . 74
7.2.2 Symbol numbering and duration . 75
7.2.3 Mixed numerology and PRACH handling . 75
7.2.3.1 Overview . 75
7.2.3.2 Frequency indexing across multiple numerologies . 75
7.2.3.3 Slot indexing with mixed numerologies . 78
7.2.3.4 PRACH formats with multiple PRACH Symbols . 80
7.2.4 DL precoding configuration parameters and indications . 80
7.2.5 LAA commands transfer procedure . 82
7.2.5.1 Introduction . 82
7.2.5.2 LBT procedure overview . 82
7.2.5.3 Definitions . 83
7.2.5.4 General guidelines for the LAA-procedure . 84
7.2.5.4.1 PDSCH Transmission . 84
7.2.5.4.2 DRS Transmission . 84
7.2.5.4.3 Congestion window information transmission . 85
7.2.6 Dynamic Spectrum Sharing (DSS) . 85
7.2.6.1 Overview . 85
7.2.6.2 Dynamic Spectrum Sharing (DSS) via dedicated endpoints . 85
7.2.6.3 Dynamic Spectrum Sharing (DSS) via Section Extension 9 for DSS . 85
7.2.7 Channel information based beamforming . 86
7.2.8 ACK/NACK Procedure for C-Plane Messages. 86
ETSI
5 ETSI TS 103 859 V12.0.1 (2024-04)
7.2.9 Section Type 4: Slot Configuration Control . 87
7.2.9.1 Overview . 87
7.2.9.2 Section Type 4 commands . 88
7.2.9.2.1 TIME_DOMAIN_BEAM_CONFIG (Time-domain beamforming command) . 88
7.2.9.2.2 TDD_CONFIG_PATTERN (TDD configuration command) . 88
7.2.9.3 ACK/NACK support . 88
7.2.9.4 O-RU handling . 88
7.2.9.5 Latency requirements . 89
7.3 Elements for the C-Plane protocol. 89
7.3.1 Section Types . 89
7.3.2 Section Extensions . 90
7.4 Section Type elements . 90
7.4.1 Overview . 90
7.4.2 Section Type 0 elements . 90
7.4.3 Section Type 1 elements . 92
7.4.4 reserved (reserved for future use) . 94
7.4.5 Section Type 3 elements . 94
7.4.6 Section Type 4 elements . 95
7.4.7 Section Type 5 elements . 99
7.4.8 Section Type 6 elements . 100
7.4.9 Section Type 7 elements . 103
7.4.10 Section Type 8 elements . 107
7.5 Coding of Section Type IEs . 108
7.5.1 Transport layer . 108
7.5.2 Application layer, common . 108
7.5.2.1 dataDirection (data direction (gNB Tx/Rx)) . 108
7.5.2.2 payloadVersion (payload version) . 108
7.5.2.3 filterIndex (filter index) . 108
7.5.2.4 frameId (frame identifier) . 109
7.5.2.5 subframeId (subframe identifier) . 109
7.5.2.6 slotId (slot identifier). 109
7.5.2.7 startSymbolId (start symbol identifier) . 110
7.5.2.8 numberOfsections (number of sections) . 110
7.5.2.9 sectionType (Section Type) . 110
7.5.2.10 udCompHdr (user data compression header) . 110
7.5.2.11 numberOfUEs (number Of UEs) . 111
7.5.2.12 timeOffset (time offset) . 111
7.5.2.13 frameStructure (frame structure) . 111
7.5.2.14 cpLength (cyclic prefix length) . 112
7.5.2.15 ciCompHdr (channel information compression header) . 113
7.5.2.16 scs (sub-carrier spacing) . 114
7.5.2.17 cmdScope (command scope) . 114
7.5.2.18 numberOfST4Cmds (Number of Section Type 4 commands) . 115
7.5.3 Application layer, sections . 115
7.5.3.1 sectionId (section identifier). 115
7.5.3.2 rb (resource block indicator) . 116
7.5.3.3 symInc (symbol number increment command) . 116
7.5.3.4 startPrbc (starting PRB of data section description) . 117
7.5.3.5 reMask (resource element mask) . 117
7.5.3.6 numPrbc (number of contiguous PRBs per data section description) . 118
7.5.3.7 numSymbol (number of symbols) . 118
7.5.3.8 ef (extension flag) . 119
7.5.3.9 beamId (beam identifier) . 119
7.5.3.10 ueId . 119
7.5.3.11 freqOffset (frequency offset) . 119
7.5.3.12 regularizationFactor (regularization factor) . 120
7.5.3.13 ciIsample, ciQsample (channel information I and Q values) . 120
7.5.3.14 laaMsgType (LAA message type) . 121
7.5.3.15 laaMsgLen (LAA message length) . 121
7.5.3.16 lbtHandle . 121
7.5.3.17 lbtDeferFactor (listen-before-talk defer factor) . 121
7.5.3.18 lbtBackoffCounter (listen-before-talk backoff counter) . 122
ETSI
6 ETSI TS 103 859 V12.0.1 (2024-04)
7.5.3.19 lbtOffset (listen-before-talk offset) . 122
7.5.3.20 MCOT (maximum channel occupancy time) . 122
7.5.3.21 lbtMode (LBT mode) . 122
7.5.3.22 lbtPdschRes (LBT PDSCH result) . 122
7.5.3.23 sfStatus (subframe status) . 123
7.5.3.24 lbtDrsRes (LBT DRS result) . 123
7.5.3.25 initialPartialSF (Initial partial SF) . 123
7.5.3.26 lbtBufErr (LBT buffer error) . 123
7.5.3.27 sfnSf (SFN/SF end) . 123
7.5.3.28 lbtCWConfig_H (HARQ parameters for congestion window management) . 124
7.5.3.29 lbtCWConfig_T (TB parameters for congestion window management) . 124
7.5.3.30 lbtTrafficClass (traffic class priority for congestion window management) . 124
7.5.3.31 lbtCWR_Rst (notification about packet reception successful or not) . 124
7.5.3.32 ciCompParam (channel information compression parameter) . 124
7.5.3.33 reserved (reserved for future use) . 125
7.5.3.34 numberOfAcks (number of ACKs) . 125
7.5.3.35 numberofNacks (number of NACKs) . 125
7.5.3.36 ackId (ACK Id) . 125
7.5.3.37 nackId (NACK Id). 125
7.5.3.38 st4CmdType (Section Type 4 command type) . 126
7.5.3.39 st4CmdLen (Section Type 4 command length) . 126
7.5.3.40 numSlots (number of slots) . 126
7.5.3.41 ackNackReqId (ACK/NACK Request ID) . 126
7.5.3.42 symbolMask (TIME_DOMAIN_BEAM_CONFIG symbol mask) . 127
7.5.3.43 disableTDBFNs (disable sending tdBeamNum) . 127
7.5.3.44 tdBeamGrp (time-domain beam group identity) . 127
7.5.3.45 bfwCompHdr (beamforming weight compression header) . 127
7.5.3.46 disableTDBFWs (disable sending time-domain beamforming weights) . 128
7.5.3.47 bfwCompParam (beamforming weight compression parameter) . 128
7.5.3.48 bfWI, bfWQ (beamforming weights I and Q values) . 128
7.5.3.49 dirPattern (symbol data direction (gNB Tx/Rx) pattern). 128
7.5.3.50 guardPattern (guard pattern bitmask) . 128
7.6 Section Extension elements . 129
7.6.1 Overview . 129
7.6.2 Common parameters . 132
7.6.2.1 extType (extension type) . 132
7.6.2.2 ef (extension flag) . 132
7.6.2.3 extLen (extension length) . 132
7.7 Coding of Section Extension IEs . 133
7.7.1 SE 1: Beamforming weights . 133
7.7.1.1 Overview . 133
7.7.1.2 bfwCompHdr (beamforming weight compression header) . 133
7.7.1.3 bfwCompParam (beamforming weight compression parameter) . 134
7.7.1.4 bfwI (beamforming weight in-phase value) . 135
7.7.1.5 bfwQ (beamforming weight quadrature value) . 135
7.7.2 SE 2: Beamforming attributes . 135
7.7.2.1 Overview . 135
7.7.2.2 bfaCompHdr (beamforming attributes compression header) . 135
7.7.2.3 bfAzPt (beamforming azimuth pointing parameter) . 136
7.7.2.4 bfZePt (beamforming zenith pointing parameter) . 137
7.7.2.5 bfAz3dd (beamforming azimuth beamwidth parameter) . 137
7.7.2.6 bfZe3dd (beamforming zenith beamwidth parameter) . 137
7.7.2.7 bfAzSl (beamforming azimuth sidelobe parameter) . 137
7.7.2.8 bfZeSl (beamforming zenith sidelobe parameter) . 137
7.7.2.9 zero-padding. 138
7.7.3 SE 3: DL precoding parameters . 138
7.7.3.1 Overview . 138
7.7.3.2 codebookIndex (precoder codebook used for transmission) . 139
7.7.3.3 layerID (Layer ID for DL transmission) . 139
7.7.3.4 txScheme (transmission scheme) . 139
7.7.3.5 numLayers (number of layers used for DL transmission) . 140
7.7.3.6 crsReMask (CRS resource element mask) . 140
ETSI
7 ETSI TS 103 859 V12.0.1 (2024-04)
7.7.3.7 crsSymNum (CRS symbol number indication) . 140
7.7.3.8 crsShift (crsShift used for DL transmission) . 140
7.7.3.9 beamIdAP1 (beam id to be used for antenna port 1) . 141
7.7.3.10 beamIdAP2 (beam id to be used for antenna port 2) . 141
7.7.3.11 beamIdAP3 (beam id to be used for antenna port 3) . 141
7.7.4 SE 4: Modulation compression parameters . 141
7.7.4.1 Overview . 141
7.7.4.2 csf (constellation shift flag) . 142
7.7.4.3 modCompScaler (modulation compression scaler value) . 142
7.7.5 SE 5: Modulation compression additional para meters . 143
7.7.5.1 Overview . 143
7.7.5.2 mcScaleReMask (modulation compression power scale RE mask) . 144
7.7.5.3 csf (constellation shift flag) . 144
7.7.5.4 mcScaleOffset (scaling value for modulation compression) . 144
7.7.6 SE 6: Non-contiguous PRB allocation in time and frequency domain . 145
7.7.6.1 Overview . 145
7.7.6.2 rbgSize (resource block group size) . 146
7.7.6.3 rbgMask (resource block group bit mask) . 146
7.7.6.4 symbolMask (symbol bit mask) . 147
7.7.6.5 priority . 148
7.7.6.6 repetition (repetition flag) . 148
7.7.7 SE 7: eAxC mask . 148
7.7.7.1 Overview . 148
7.7.7.2 eAxCmask (eAxC Mask) . 148
7.7.8 SE 8: Regularization factor . 149
7.7.8.1 Overview .
...