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O-RAN协议架构、传输层、用户面\控制面板等，无线网智能控制器非实时层、无线网智能控制器近实时层、多制式CU协议栈软件和云平台、DU和RRU功能实体
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ORAN-WG4.CUS.0-v01.00
Technical Specification
O-RAN Fronthaul Working Group
Control, User and Synchronization Plane Specification
Prepared by the O-RAN Alliance. Copyright © 2019 by the O-RAN Alliance.
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.
Copyright © 2019 by the O-RAN Alliance.
Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 1
________________________________________________________________________________________________
Copyright © 2019 by the O-RAN Alliance.
Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 2
ORAN-WG4.CUS.0-v01.00
Revision History
1
Date
Revision
Author
Description
2019.03.11
01.00
M. Garyantes
Final version 01.00
2
3
________________________________________________________________________________________________
Copyright © 2019 by the O-RAN Alliance.
Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 3
ORAN-WG4.CUS.0-v01.00
Contents
1
Revision History ................................................................................................................................................. 2
2
Chapter 1 Introductory Material ......................................................................................................................... 6
3
1.1 Scope ................................................................................................................................................................. 6
4
1.2 References.......................................................................................................................................................... 6
5
1.2.1 Synchronization-specific Reference Documents .......................................................................................... 7
6
1.3 Definitions and Abbreviations ........................................................................................................................... 7
7
1.3.1 Definitions .................................................................................................................................................... 8
8
1.3.2 Abbreviations ............................................................................................................................................... 9
9
Chapter 2 Architecture & Requirements .......................................................................................................... 10
10
2.1 Functional Split ................................................................................................................................................ 10
11
2.1.1 Selected Split 7-2x (DL) ............................................................................................................................ 11
12
2.1.2 Selected Split 7-2x (UL) ............................................................................................................................ 14
13
2.2 Data Flows ....................................................................................................................................................... 15
14
2.3 Latency Requirements ..................................................................................................................................... 16
15
2.3.1 Timing Parameter Relationships ................................................................................................................ 17
16
2.3.2 U-Plane/ C-Plane Timing ........................................................................................................................... 19
17
2.3.3 Computed Latency Methods ...................................................................................................................... 21
18
2.3.4 Latency Categories for O-DU with dynamic timing advance .................................................................... 26
19
2.3.5 Latency Categories for O-DU with fixed timing advance .......................................................................... 28
20
2.3.6 Non-Delay Managed U-Plane Traffic ........................................................................................................ 29
21
2.4 Reception Window Monitoring ...................................................................................................................... 30
22
Chapter 3 Transport & Protocol Architecture .................................................................................................. 31
23
3.1 Transport Encapsulation Types ........................................................................................................................ 31
24
3.1.1 Ethernet Encapsulation ............................................................................................................................... 31
25
3.1.2 IP/UDP Encapsulation................................................................................................................................ 31
26
3.1.3 Transport Headers ...................................................................................................................................... 32
27
3.2 Protocol Architecture ....................................................................................................................................... 38
28
3.2.1 C-plane ....................................................................................................................................................... 38
29
3.2.2 U-plane ....................................................................................................................................................... 38
30
3.2.3 S-plane ....................................................................................................................................................... 38
31
3.3 Quality of Service ............................................................................................................................................ 38
32
3.4 Data Flow Identification .................................................................................................................................. 39
33
3.5 Fragmentation .................................................................................................................................................. 40
34
3.5.1 Application layer fragmentation ................................................................................................................. 40
35
3.5.2 Radio Transport layer (eCPRI or IEEE-1914.3) fragmentation ................................................................. 40
36
3.5.3 Fragmentation Guideline ............................................................................................................................ 41
37
Chapter 4 Security ............................................................................................................................................ 41
38
Chapter 5 C-plane Protocol .............................................................................................................................. 42
39
5.1 General ............................................................................................................................................................. 42
40
5.2 Function ........................................................................................................................................................... 42
41
5.2.1 C-Plane Transport ...................................................................................................................................... 42
42
5.3 Elementary Procedures .................................................................................................................................... 42
43
5.3.1 Scheduling and Beamforming Commands Transfer procedure .................................................................. 42
44
5.3.2 Mixed Numerology and PRACH Handling ............................................................................................... 43
45
5.3.3 DL Precoding configuration parameters and indications ........................................................................... 46
46
5.3.4 LAA Commands Transfer procedure ......................................................................................................... 47
47
5.3.5 Symbol Numbering and Duration ............................................................................................................................ 51
48
5.4 Elements for the C-plane Protocol ................................................................................................................... 52
49
5.4.1 General ....................................................................................................................................................... 52
50
5.4.2 Scheduling and Beamforming Commands ................................................................................................. 53
51
5.4.3 Coding of Information Elements – Transport Layer .................................................................................. 63
52
5.4.4 Coding of Information Elements – Application Layer, Common .............................................................. 63
53
5.4.5 Coding of Information Elements – Application Layer, Sections ............................................................... 67
54
5.4.6 Section Extension Commands .................................................................................................................... 75
55
________________________________________________________________________________________________
Copyright © 2019 by the O-RAN Alliance.
Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 4
ORAN-WG4.CUS.0-v01.00
5.4.7 Coding of Information Elements – Application Layer, Section Extensions ............................................... 77
1
Chapter 6 U-plane Protocol .............................................................................................................................. 87
2
6.1 General ............................................................................................................................................................. 87
3
6.1.1 U-plane Transport ...................................................................................................................................... 87
4
6.1.2 U-plane Data Compression ........................................................................................................................ 87
5
6.1.3 Digital Power Scaling................................................................................................................................. 87
6
6.2 Elementary Procedures .................................................................................................................................... 92
7
6.2.1 IQ Data Transfer procedure ........................................................................................................................ 92
8
6.3 Elements for the U-plane Protocol ................................................................................................................... 94
9
6.3.1 General ....................................................................................................................................................... 94
10
6.3.2 DL/UL Data ............................................................................................................................................... 94
11
6.3.3 UL/DL Data Coding of Information Elements ........................................................................................... 96
12
6.3.4 DL Data Precoding ..................................................................................................................................... 99
13
6.3.5 Data Transfer for Special Cases ................................................................................................................. 99
14
Chapter 7 Counters and KPIs ........................................................................................................................... 99
15
7.1 Counters ........................................................................................................................................................... 99
16
Chapter 8 Specification Mandatory and Optional Capabilities ...................................................................... 100
17
8.1 General ........................................................................................................................................................... 100
18
Chapter 9 S-Plane Protocol ............................................................................................................................ 103
19
9.1 General ........................................................................................................................................................... 103
20
9.1.1 Overview .................................................................................................................................................. 103
21
9.2 Synchronization Baseline .............................................................................................................................. 103
22
9.2.1 List of Reference Documents ................................................................................................................... 103
23
9.2.2 Clock Model and Synchronization Topology ........................................................................................... 103
24
9.2.3 Clock Synchronization ............................................................................................................................. 108
25
9.2.4 Profiles ..................................................................................................................................................... 108
26
9.2.5 Synchronization Accuracy ....................................................................................................................... 109
27
9.3 Time and Frequency Synchronization Requirements .................................................................................... 112
28
9.3.1 Allowed PTP and SyncE clock types and clock classes ........................................................................... 112
29
9.3.2 Frequency and Time Synchronization Requirements across fronthaul network elements ....................... 113
30
9.4 Node Behavior Guidelines ............................................................................................................................. 118
31
9.4.1 Configurations C1 and C2 ........................................................................................................................ 118
32
9.4.2 Configurations C3 .................................................................................................................................... 120
33
9.4.3 Configurations C4 .................................................................................................................................... 122
34
9.5 S-Plane Handling in Multiple Link Scenarios ............................................................................................... 123
35
9.6 Announce Messages ...................................................................................................................................... 123
36
9.7 Elementary Procedures .................................................................................................................................. 123
37
9.7.1 PTP Time Synchronization procedure ..................................................................................................... 123
38
9.7.2 System Frame Number Calculation from GPS Time ............................................................................... 123
39
10 Beamforming Guidelines ..................................................................................................................... 124
40
10.1 General ........................................................................................................................................................... 124
41
10.2 Hierarchy of Radiation Structure in O-RU .................................................................................................... 124
42
10.3 Calibration ..................................................................................................................................................... 126
43
10.4 beamId Use for Various Beamforming Methods ........................................................................................... 126
44
10.4.1 Predefined-beam Beamforming ............................................................................................................... 127
45
10.4.2 Weight-based dynamic beamforming ................................................................................................................. 128
46
10.4.3 Attribute-based dynamic beamforming .................................................................................................... 131
47
10.4.4 Channel-information-based beamforming ................................................................................................ 132
48
10.5 O-RU Antenna Model supported by O-RAN ................................................................................................ 132
49
10.5.1 Coordinate Systems .................................................................................................................................. 132
50
10.5.2 O-RU Antenna Model Parameters ........................................................................................................... 133
51
10.5.3 Identification and Ordering of Array Elements ........................................................................................ 134
52
10.5.4 Relations Between Array Elements .......................................................................................................... 134
53
10.5.5 Model Usage ............................................................................................................................................ 134
54
Annex A Compression Methods .............................................................................................................. 136
55
A.1 Block Floating Point Compression ................................................................................................................ 136
56
A.1.1 Block Floating Point Compression Algorithm ......................................................................................... 137
57
________________________________________________________________________________________________
Copyright © 2019 by the O-RAN Alliance.
Your use is subject to the terms of the O-RAN Adopter License Agreement in Annex ZZZ 5
ORAN-WG4.CUS.0-v01.00
A.1.2 Block Floating Point Decompression Algorithm ..................................................................................... 138
1
A.2 Block Scaling Compression ........................................................................................................................... 138
2
A.2.1 Block Scaling Compression Algorithm .................................................................................................... 139
3
A.2.2 Block Scaling Decompression Algorithm ................................................................................................ 139
4
A.3 -Law Compression....................................................................................................................................... 139
5
A.3.1 -Law Compression Algorithm ............................................................................................................... 139
6
A.3.2 -Law Decompression Algorithm ............................................................................................................ 141
7
A.3.3 -Law udCompParam and IQ data format ............................................................................................... 142
8
A.4 Beamspace Compression and Decompression ............................................................................................... 142
9
A.4.1 Beamspace Compression Algorithm ........................................................................................................ 142
10
A.4.2 Beamspace Decompression Algorithm .................................................................................................... 143
11
A.5 Modulation Compression ............................................................................................................................... 144
12
Annex B Delay Management Use Cases ................................................................................................... 146
13
B.1 Latency categories and sub-categories ........................................................................................................... 151
14
B.2 Example Case: Evaluating O-DU / O-RU Combinations .............................................................................. 155
15
Annex C M-Plane Impacts ....................................................................................................................... 158
16
Annex D IQ Sample and Exponent Packetization for Different Bitwidths ............................................... 158
17
Annex E OFDM Phase Compensation ..................................................................................................... 163
18
Annex F Beamforming Attributes Frame of Reference ............................................................................ 163
19
Annex G LAA Algorithms and Examples: ............................................................................................... 165
20
Annex H S-Plane detailed frequency and phase error budget analysis, and future ITU-T clock types
21
and classes reference ............................................................................................................................ 168
22
H.1 Reference documents ..................................................................................................................................... 168
23
H.2 Frequency and time error budget analysis ..................................................................................................... 169
24
H.3 Frequency error budget for Network limit (C3) : ........................................................................................... 172
25
Annex I Precoding and Examples: ........................................................................................................... 175
26
Annex J Beamforming Methods Description: .......................................................................................... 182
27
Annex K: Layers of Array Elements .............................................................................................................. 185
28
K.1 Use Case A ............................................................................................................................................... 185
29
K.2 Use Case B ............................................................................................................................................... 186
30
Annex ZZZ : O-RAN Adopter License Agreement ....................................................................................... 187
31
Section 1: DEFINITIONS .............................................................................................................................................. 187
32
Section 2: COPYRIGHT LICENSE ............................................................................................................................... 187
33
Section 3: FRAND LICENSE ........................................................................................................................................ 187
34
Section 4: TERM AND TERMINATION ...................................................................................................................... 188
35
Section 5: CONFIDENTIALITY ................................................................................................................................... 188
36
Section 6: INDEMNIFICATION ................................................................................................................................... 188
37
Section 7: LIMITATIONS ON LIABILITY; NO WARRANTY .................................................................................. 189
38
Section 8: ASSIGNMENT ............................................................................................................................................. 189
39
Section 9: THIRD-PARTY BENEFICIARY RIGHTS .................................................................................................. 189
40
Section 10: BINDING ON AFFILIATES ...................................................................................................................... 189
41
Section 11: GENERAL ................................................................................................................................................... 189
42
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44
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