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ORAN-WG4.CUS.0-v03.00 Technical Specification O-RAN Fronthaul Working Group Control, User and Synchronization Plane Specification **ORAN-WG4.CUS.0-v03.00 技术规范概述** ORAN（开放无线接入网络）是通信行业中的一个创新概念，旨在推动无线接入网络的开放和解耦，以促进网络的灵活性、可扩展性和成本效益。ORAN联盟是一个由业界领先公司组成的组织，致力于定义ORAN的架构和技术标准。该组织的工作组（WG）负责不同的专题领域，其中ORAN-WG4专注于前传（Fronthaul）部分，这是连接无线单元（RU，Radio Unit）与分布式单元（DU，Distributed Unit）或集中式单元（CU，Centralized Unit）的关键组件。 **控制面、用户面和同步平面规范** ORAN-WG4.CUS.0-v03.00技术规范详细阐述了ORAN前传接口的控制面、用户面和同步平面的详细要求和规范。控制面处理网络管理和控制信号的传输，包括配置、故障管理、性能监控等功能。用户面则涉及用户数据的传输，确保数据在RU和DU/CU之间高效、可靠地流动。同步平面则关乎网络中各个组件之间的时钟同步，这对于无线通信系统的精确操作至关重要。 **文档修订历史** 此规范文档经历了多次修订，每次修订都反映了ORAN联盟成员对文档的反馈和改进。例如，2020年3月13日的03.00版更新了第43号至第50号评论所提出的所有更改，并修正了图和表的编号以及目录。这些修订确保了文档的准确性和完整性。 **O-RAN联盟采用者许可协议** 使用、访问或下载此O-RAN规范文档的任何部分，都需遵守O-RAN联盟的采用者许可协议，该协议包含在文档的Annex ZZZ中。这强调了对知识产权的尊重和保护，同时规定了使用这些技术规范的法律条款和条件。 **技术内容** 尽管具体内容没有提供，但可以推测这份技术规范涵盖了以下主题： 1. **接口定义**：详细描述了RU与DU/CU之间的接口，可能包括接口协议、数据格式、传输层协议等。 2. **性能指标**：定义了前传接口的性能要求，如延迟、带宽效率、可靠性等。 3. **安全**：规定了接口的安全措施，以防止未经授权的访问和数据泄露。 4. **同步机制**：详细说明了如何实现精确的时钟同步，以保证网络操作的准确性。 5. **错误管理和恢复**：定义了错误检测、报告和恢复策略，以增强网络的健壮性。 6. **灵活性和可扩展性**：设计考虑了未来网络演进的需求，可能包括对新功能的支持和网络容量的扩展能力。 ORAN-WG4.CUS.0-v03.00技术规范是ORAN前传接口的关键文档，它为构建开放式、灵活且高效的无线接入网络提供了基础。通过不断的修订和完善，这一规范确保了ORAN联盟的成员能够在遵循统一标准的同时，创新和发展自己的无线网络解决方案。

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ORAN-WG4.CUS.0-v03.00

Technical Specification

O-RAN Fronthaul Working Group

Control, User and Synchronization Plane Specification

By using, accessing or downloading any part of this O-RAN specification document, including by copying, saving, distributing,

displaying or preparing derivatives of, you agree to be and are bound to the terms of the O-RAN Adopter License Agreement

contained in Annex ZZZ of this specification. All other rights reserved.

Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 1

________________________________________________________________________________________________

Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 2

ORAN-WG4.CUS.0-v03.00

Revision History

Date

Revision

Description

2020.03.13

03.00

Update from comments #43 - #50, accept all changes and fix figure and table numbering

and table of contents as needed.

2020.03.10

02.00.04

Updated using the following CRs: NOK-0021, MAV-0005, ERI-0009, SAM-0016,

SAM-020, SAM-0021, SAM-0022 plus all comments from the comment sheet up to

comment #42

2020.02.28

02.00.03

Updated using the following CRs: ERI-0007, COM-0001, COM-0002 and SAM-0014 …

as well as comments from the comment review sheet.

2020.02.21

02.00.02

Updated using the following CRs: DCM-0002, DCM-0003, NOK-0020, NOK-0026,

NOK-0029, ERI-0004, ETR-0006, SAM-0012, SAM-0013 and two comments received

from Ericsson.

2020.02.14

02.00.01

Updated using the following CRs: NOK-0014, NOK-0017, NOK-0018, NOK-0019,

NOK-0023, NOK-0024, INT-0002, INT-0003, INT-0004, MAV-0001, MAV-0002,

MAV-0003, MAV-0004, ERI-0003, ERI-0006, ETR-0001, ETR-0002, ETR-0003 and

MCS-0001, as well as made minor grammatical corrections.

2019.08.02

02.00

Updated with CR FJT-0001 and NOK-0015 and NOK-0016 and comments #31 - #34

which are the final comments; updated version to v02.00 and created “tc” and clean

versions for WG4 approval.

2019.06.27

01.00.04

Updated with comments #22 - #30 in the review comment sheet as well as based on

discussions at the June 27 meeting. Most changes are related to mandatory/optional

statements and conditions, and in 3.1.3.1.6 regarding endpoint use.

2019.06.20

01.00.03

Updated with changes from Tokyo F2F meeting (see comment sheet), as well as NEC-

0003.

2019.06.10

01.00.02

Accomodates review comments against v01.00.01.

2019.06.02

01.00.01

Updated with NOK-0006, NOK-0007, NOK-0008, NOK-0009, NOK-0010, NOK-0011,

NOK-0012, NOK-0013, ERI-0001, ERI-0002, INT-0001, SAM-0003, SAM-0004, CAB-

0001, CAB-0002 and CAB-0003, which include WI non-ideal fronthaul and several

mandatory / optional modifications, as well as adding Section Extention =6 and =7.

2019.03.11

01.00

Final version 01.00

________________________________________________________________________________________________

Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 3

ORAN-WG4.CUS.0-v03.00

Contents

Revision History ................................................................................................................................................. 2

Chapter 1 Introductory Material ....................................................................................................................... 10

1.1 Scope ............................................................................................................................................................... 10

1.2 References........................................................................................................................................................ 10

1.2.1 Synchronization-specific Reference Documents ........................................................................................ 11

1.3 Definitions and Abbreviations and Conventions ............................................................................................. 12

1.3.1 Definitions .................................................................................................................................................. 12

1.3.2 Abbreviations ............................................................................................................................................. 14

1.3.3 Document Conventions............................................................................................................................................ 14

1.3.3.1 Fields and Bitmasks in Messages ......................................................................................................... 14

Chapter 2 Architecture & Requirements .......................................................................................................... 16

2.1 Functional Split ................................................................................................................................................ 16

2.1.1 Selected Split 7-2x (DL) ............................................................................................................................ 17

2.1.2 Selected Split 7-2x (UL) ............................................................................................................................ 20

2.2 Data Flows ....................................................................................................................................................... 21

2.3 Latency Requirements ..................................................................................................................................... 22

2.3.1 Timing Parameter Relationships ................................................................................................................ 23

2.3.1.1 O-DU Transmission Window ............................................................................................................... 24

2.3.2 U-Plane/ C-Plane Timing ........................................................................................................................... 25

2.3.3 Computed Latency Methods ...................................................................................................................... 28

2.3.3.1 Fronthaul Timing Domain .................................................................................................................... 29

2.3.3.2 Defined Transport Method ................................................................................................................... 30

2.3.3.3 Measured Transport Method ................................................................................................................ 31

2.3.4 Latency Categories for O-DU with dynamic timing advance .................................................................... 32

2.3.5 Latency Categories for O-DU with fixed timing advance .......................................................................... 35

2.3.6 Non-Delay Managed U-Plane Traffic ........................................................................................................ 36

2.4 Reception Window Monitoring ...................................................................................................................... 37

Chapter 3 Transport & Protocol Architecture .................................................................................................. 39

3.1 Transport Encapsulation Types ........................................................................................................................ 39

3.1.1 Ethernet Encapsulation ............................................................................................................................... 39

3.1.2 IP/UDP Encapsulation................................................................................................................................ 39

3.1.3 Transport Headers ...................................................................................................................................... 40

3.1.3.1 eCPRI Transport Header ...................................................................................................................... 40

3.1.3.1.1 ecpriVersion (eCPRI protocol revision) .......................................................................................... 40

3.1.3.1.2 ecpriReserved (eCPRI reserved) ..................................................................................................... 41

3.1.3.1.3 ecpriConcatenation (eCPRI concatenation indicator) ..................................................................... 41

3.1.3.1.4 ecpriMessage (eCPRI message type) .............................................................................................. 41

3.1.3.1.5 ecpriPayload (eCPRI payload size) ................................................................................................. 41

3.1.3.1.6 ecpriRtcid / ecpriPcid (real time control data / IQ data transfer message series identifier) ............ 42

3.1.3.1.7 ecpriSeqid (message identifier) ....................................................................................................... 43

3.1.3.2 1914.3 Transport Header ...................................................................................................................... 46

3.1.3.2.1 RoEsubType (sub type / message type) .......................................................................................... 46

3.1.3.2.2 RoEflowID (flow identifier) ........................................................................................................... 47

3.1.3.2.3 RoElength (length) .......................................................................................................................... 47

3.1.3.2.4 RoEorderInfo (order information)................................................................................................... 47

3.2 Protocol Architecture ....................................................................................................................................... 47

3.2.1 C-plane ....................................................................................................................................................... 47

3.2.2 U-plane ....................................................................................................................................................... 48

3.2.3 S-plane ....................................................................................................................................................... 48

3.3 Quality of Service ............................................................................................................................................ 48

3.4 Data Flow Identification .................................................................................................................................. 49

3.5 Fragmentation .................................................................................................................................................. 50

3.5.1 Application layer fragmentation ................................................................................................................. 50

3.5.2 Radio Transport layer (eCPRI or IEEE-1914.3) fragmentation ................................................................. 50

3.5.3 Fragmentation Guideline ............................................................................................................................ 51

________________________________________________________________________________________________

Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 4

ORAN-WG4.CUS.0-v03.00

Chapter 4 Security ............................................................................................................................................ 52

Chapter 5 C-plane Protocol .............................................................................................................................. 53

5.1 General ............................................................................................................................................................. 53

5.2 Function ........................................................................................................................................................... 53

5.2.1 C-Plane Transport ...................................................................................................................................... 53

5.3 Elementary Procedures .................................................................................................................................... 53

5.3.1 Scheduling and Beamforming Commands Transfer procedure .................................................................. 53

5.3.2 Mixed Numerology and PRACH Handling ............................................................................................... 54

5.3.3 DL Precoding configuration parameters and indications ........................................................................... 57

5.3.4 LAA Commands Transfer procedure ......................................................................................................... 59

5.3.4.1 LBT procedure overview ...................................................................................................................... 59

5.3.4.2 Definitions ............................................................................................................................................ 60

5.3.4.3 General Guidelines for the LAA-procedure ......................................................................................... 61

5.3.4.3.1 PDSCH Transmission ..................................................................................................................... 61

5.3.4.3.2 DRS Transmission .......................................................................................................................... 62

5.3.4.3.3 Congestion Window Information Transmission ............................................................................. 62

5.3.5 Symbol Numbering and Duration .............................................................................................................. 62

5.3.6 Dynamic Spectrum Sharing (DSS) ............................................................................................................. 63

5.3.6.1 Dynamic Spectrum Sharing (DSS) via Dedicated Endpoints ............................................................... 63

5.3.6.2 Dynamic Spectrum Sharing (DSS) via Section Extension =9 for DSS ................................................ 63

5.4 Elements for the C-plane Protocol ................................................................................................................... 63

5.4.1 General ....................................................................................................................................................... 63

5.4.1.1 Section Extensions ................................................................................................................................ 64

5.4.2 Scheduling and Beamforming Commands ................................................................................................. 64

5.4.3 Coding of Information Elements – Transport Layer .................................................................................. 75

5.4.4 Coding of Information Elements – Application Layer, Common .............................................................. 75

5.4.4.1 dataDirection (data direction (gNB Tx/Rx)) ......................................................................................... 75

5.4.4.2 payloadVersion (payload version) ........................................................................................................ 75

5.4.4.3 filterIndex (filter index) ........................................................................................................................ 75

5.4.4.4 frameId (frame identifier) ..................................................................................................................... 76

5.4.4.5 subframeId (subframe identifier) .......................................................................................................... 76

5.4.4.6 slotId (slot identifier) ............................................................................................................................ 77

5.4.4.7 startSymbolid (start symbol identifier) ................................................................................................. 77

5.4.4.8 numberOfsections (number of sections) ............................................................................................... 77

5.4.4.9 sectionType (section type) .................................................................................................................... 77

5.4.4.10 udCompHdr (user data compression header) ........................................................................................ 77

5.4.4.11 numberOfUEs (number Of UEs) .......................................................................................................... 78

5.4.4.12 timeOffset (time offset) ........................................................................................................................ 78

5.4.4.13 frameStructure (frame structure) .......................................................................................................... 78

5.4.4.14 cpLength (cyclic prefix length) ............................................................................................................ 79

5.4.5 Coding of Information Elements – Application Layer, Sections ............................................................... 79

5.4.5.1 sectionId (section identifier) ................................................................................................................. 79

5.4.5.2 rb (resource block indicator) ................................................................................................................. 80

5.4.5.3 symInc (symbol number increment command) .................................................................................... 80

5.4.5.4 startPrbc (starting PRB of data section description) ............................................................................. 81

5.4.5.5 reMask (resource element mask) .......................................................................................................... 81

5.4.5.6 numPrbc (number of contiguous PRBs per data section description)................................................... 81

5.4.5.7 numSymbol (number of symbols) ........................................................................................................ 82

5.4.5.8 ef (extension flag) ................................................................................................................................. 82

5.4.5.9 beamId (beam identifier) ...................................................................................................................... 82

5.4.5.10 ueId (UE identifier) .............................................................................................................................. 83

5.4.5.11 freqOffset (frequency offset) ................................................................................................................ 83

5.4.5.12 regularizationFactor (regularization Factor) ......................................................................................... 83

5.4.5.13 ciIsample, ciQsample (channel information I and Q values) ................................................................ 83

5.4.5.14 laaMsgType (LAA message type) ........................................................................................................ 84

5.4.5.15 laaMsgLen (LAA message length) ....................................................................................................... 84

5.4.5.16 lbtHandle .............................................................................................................................................. 84

5.4.5.17 lbtDeferFactor (listen-before-talk defer factor) .................................................................................... 84

5.4.5.18 lbtBackoffCounter (listen-before-talk backoff counter) ....................................................................... 85

5.4.5.19 lbtOffset (listen-before-talk offset) ....................................................................................................... 85

________________________________________________________________________________________________

Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 5

ORAN-WG4.CUS.0-v03.00

5.4.5.20 MCOT (maximum channel occupancy time) ....................................................................................... 85

5.4.5.21 lbtMode (LBT Mode) ........................................................................................................................... 85

5.4.5.22 lbtPdschRes (LBT PDSCH Result) ...................................................................................................... 85

5.4.5.23 sfStatus (subframe status) ..................................................................................................................... 86

5.4.5.24 lbtDrsRes (LBT DRS Result) ............................................................................................................... 86

5.4.5.25 initialPartialSF (Initial partial SF) ........................................................................................................ 86

5.4.5.26 lbtBufErr (LBT Buffer Error) ............................................................................................................... 86

5.4.5.27 sfnSf (SFN/SF End) .............................................................................................................................. 86

5.4.5.28 lbtCWConfig_H (HARQ Parameters for Congestion Window management) ..................................... 87

5.4.5.29 lbtCWConfig_T (TB Parameters for Congestion Window management) ............................................ 87

5.4.5.30 lbtTrafficClass (Traffic class priority for Congestion Window management) ..................................... 87

5.4.5.31 lbtCWR_Rst (Notification about packet reception successful or not) .................................................. 87

5.4.5.32 reserved (reserved for future use) ......................................................................................................... 87

5.4.6 Section Extension Commands .................................................................................................................... 88

5.4.6.1 extType (extension type) ...................................................................................................................... 89

5.4.6.2 ef (extension flag) ................................................................................................................................. 89

5.4.6.3 extLen (extension length)................................................................................................................ 89

5.4.7 Coding of Information Elements – Application Layer, Section Extensions ............................................... 89

5.4.7.1 ExtType=1: Beamforming Weights Extension Type ............................................................................ 89

5.4.7.1.1 bfwCompHdr (beamforming weight compression header) ............................................................. 90

5.4.7.1.2 bfwCompParam (beamforming weight compression parameter) .................................................... 90

5.4.7.1.3 bfwI (beamforming weight in-phase value) .................................................................................... 91

5.4.7.1.4 bfwQ (beamforming weight quadrature value) ............................................................................... 91

5.4.7.2 ExtType=2: Beamforming Attributes Extension Type ......................................................................... 91

5.4.7.2.1 bfaCompHdr (beamforming attributes compression header) .......................................................... 92

5.4.7.2.2 bfAzPt (beamforming azimuth pointing parameter) ....................................................................... 92

5.4.7.2.3 bfZePt (beamforming zenith pointing parameter) ........................................................................... 93

5.4.7.2.4 bfAz3dd (beamforming azimuth beamwidth parameter) ................................................................ 93

5.4.7.2.5 bfZe3dd (beamforming zenith beamwidth parameter) .................................................................... 93

5.4.7.2.6 bfAzSl (beamforming azimuth sidelobe parameter) ....................................................................... 93

5.4.7.2.7 bfZeSl (beamforming zenith sidelobe parameter) ........................................................................... 93

5.4.7.2.8 zero-padding ......................................................................................................................................... 94

5.4.7.3 ExtType=3: DL Precoding Extension Type.......................................................................................... 94

5.4.7.3.1 codebookIndex (precoder codebook used for transmission) ........................................................... 95

5.4.7.3.2 layerID (Layer ID for DL transmission) ......................................................................................... 95

5.4.7.3.3 txScheme (transmission scheme) .................................................................................................... 95

5.4.7.3.4 numLayers (number of layers used for DL transmission) ............................................................... 95

5.4.7.3.5 crsReMask (CRS resource element mask) ...................................................................................... 96

5.4.7.3.6 crsSymlNum (CRS symbol number indication) .............................................................................. 96

5.4.7.3.7 crsShift (crsShift used for DL transmission) ................................................................................... 96

5.4.7.3.8 beamIdAP1 (beam id to be used for antenna port 1) ....................................................................... 96

5.4.7.3.9 beamIdAP2 (beam id to be used for antenna port 2) ....................................................................... 97

5.4.7.3.10 beamIdAP3 (beam id to be used for antenna port 3) ....................................................................... 97

5.4.7.4 ExtType=4: Modulation Compression Parameters Extension Type ..................................................... 97

5.4.7.4.1 csf (constellation shift flag)............................................................................................................. 97

5.4.7.4.2 modCompScaler (modulation compression scaler value) ............................................................... 98

5.4.7.5 ExtType=5: Modulation Compression Additional Parameters Extension Type ................................... 98

5.4.7.5.1 mcScaleReMask (modulation compression power scale RE mask) ............................................... 99

5.4.7.5.2 csf (constellation shift flag)............................................................................................................. 99

5.4.7.5.3 mcScaleOffset (scaling value for modulation compression) ........................................................... 99

5.4.7.6 ExtType=6: Non-contiguous PRB allocation in time and frequency domain ..................................... 100

5.4.7.6.1 rbgSize (resource block group size) .............................................................................................. 100

5.4.7.6.2 rbgMask (resource block group bit mask) .................................................................................... 101

5.4.7.6.3 symbolMask (symbol bit mask) .................................................................................................... 101

5.4.7.7 ExtType=7: eAxC Mask Section Extension ....................................................................................... 102

5.4.7.7.1 eAxCmask (eAxC Mask) .............................................................................................................. 102

5.4.7.8 ExtType=8: Regularization factor ...................................................................................................... 103

5.4.7.8.1 regularizationFactor (regularization Factor) ................................................................................. 103

5.4.7.9 ExtType=9: Dynamic Spectrum Sharing parameters ......................................................................... 103

5.4.7.9.1 technology (interface name) .......................................................................................................... 104

5.4.7.10 ExtType=10: Section description for group configuration of multiple ports ...................................... 104

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