O-RAN.WG1.OAM-Architecture-v03.00.pdf

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Annex ZZZ

O-RAN.WG1.OAM-Architecture-v03.00

Technical Specification

O-RAN

Working Group 1

O-RAN Operations and Maintenance

Architecture

Prepared by the O

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.

Agreement in Annex ZZZ

O-RAN.WG1.OAM-Architecture-v03.00

Contents 1

Chapter 1. Introductory Material ................................................................................................................ 3 3

1.1

Scope ................................................................................................................................................................. 3 4

1.2

References.......................................................................................................................................................... 3 5

1.3

Definitions and Abbreviations ........................................................................................................................... 4 6

1.3.1

Definitions .................................................................................................................................................... 4 7

1.3.2

Abbreviations ............................................................................................................................................... 5 8

Chapter 2. O-RAN Overview ..................................................................................................................... 6 9

2.1

Scope and Objectives ......................................................................................................................................... 6 10

2.2

End to End OAM Use Case ............................................................................................................................... 6 11

2.2.1

O-RAN Service Provisioning ....................................................................................................................... 6 12

2.2.2

O-RAN Measurement Data Collection ...................................................................................................... 13 13

Chapter 3. OAM Architecture .................................................................................................................. 22 14

3.1

Architectural Principles ................................................................................................................................... 22 15

3.2

Architecture Requirements .............................................................................................................................. 22 16

3.2.1

Functional Requirements ............................................................................................................................ 22 17

3.2.2

Non-Functional Requirements ................................................................................................................... 23 18

3.2.3

Security Requirements ............................................................................................................................... 23 19

3.3

Reference Architecture .................................................................................................................................... 23 20

3.3.1

Architectural Building Blocks .................................................................................................................... 24 21

3.3.2

Basic OAM Architecture ............................................................................................................................ 26 22

3.3.3 OAM Models and Deployment Options..................................................................................................... 26 23

3.3.4

Managed Elements Deployed behind a NAT ............................................................................................. 30 24

Appendix A: Cardinality .................................................................................................................................. 32 25

Appendix B: Sequence Diagram Template ...................................................................................................... 33 26

Annex A: SMO and Non-RT RIC mapping with 3GPP management system .................................................................. 43

Annex ZZZ : O-RAN Adopter License Agreement ......................................................................................... 45 28

Section 1: DEFINITIONS ................................................................................................................................................ 45

Section 2: COPYRIGHT LICENSE ................................................................................................................................. 45

Section 3: FRAND LICENSE .......................................................................................................................................... 45

Section 4: TERM AND TERMINATION ........................................................................................................................ 46

Section 5: CONFIDENTIALITY ..................................................................................................................................... 46

Section 6: INDEMNIFICATION ..................................................................................................................................... 46

Section 7: LIMITATIONS ON LIABILITY; NO WARRANTY .................................................................................... 46

Section 8: ASSIGNMENT ............................................................................................................................................... 47

Section 9: THIRD-PARTY BENEFICIARY RIGHTS .................................................................................................... 47

Section 10: BINDING ON AFFILIATES ........................................................................................................................ 47

Section 11: GENERAL ..................................................................................................................................................... 47

Agreement in Annex ZZZ

O-RAN.WG1.OAM-Architecture-v03.00

Chapter 1. Introductory Material 1

1.1 Scope 2

This Technical Specification has been produced by the O-RAN.org. 3

The contents of the present document are subject to continuing work within O-RAN WG1 and may change following 4

formal o-RAN approval. Should the o-RAN.org modify the contents of the present document, it will be re-released by o-5

RAN Alliance with an identifying change of release date and an increase in version number as follows: 6

Release x.y.z 7

where: 8

x the first digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, 9

etc. (the initial approved document will have x=01). 10

y the second digit is incremented when editorial only changes have been incorporated in the document. 11

z the third digit included only in working versions of the document indicating incremental changes during the 12

editing process. 13

The present document studies O-RAN OAM architecture and interface functions. The OAM architecture supports a 14

variety of management network deployment models, including the model of management entities (NMS/EMS/MANO) 15

connecting directly to NEs, and the indirect connection (e.g., M-Plane involved) model. A separate OAM interface 16

document provides details of the functions and protocols conveyed over the interface, that include management functions, 17

procedures, operations and corresponding solutions. 18

1.2 References 19

The following documents contain provisions which, through reference in this text, constitute provisions of the present 20

document. 21

- References are either specific (identified by date of publication, edition number, version number, etc.) or 22

non-specific. 23

- For a specific reference, subsequent revisions do not apply. 24

- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including 25

a GSM document), a non-specific reference implicitly refers to the latest version of that document in Release 15. 26

[1] 3GPP TR 21.905: “Vocabulary for 3GPP Specifications” 27

[2] 3GPP TS 38.401: "NG-RAN; Architecture description". 28

[3] 3GPP TS 28.622: "Telecommunication management; Generic Network Resource Model (NRM) 29

Integration Reference Point (IRP); Information Service (IS)". 30

[4] 3GPP TS 32.101: “Telecommunication management; Principles and high level requirements”. 31

[5] 3GPP TS 28.532: Management and orchestration; Generic management services 32

[6] 3GPP TS 28.533: Management and orchestration; Architecture framework 33

[7] 3GPP TS 28.550: Management and orchestration; Performance assurance 34

[8] 3GPP TS 28.552: Management and orchestration; 5G performance measurements 35

[9] ETSI GS NFV-IFA 005 V3.3.1 (2019-08)

, Network Functions Virtualisation (NFV) Release 36

3;Management and Orchestration;Or-Vi reference point - Interface and Information Model 37

Specification 38

[10] ETSI GS NFV-IFA 027 V2.4.1 (2018-05), Network Functions Virtualisation (NFV) Release 39

2;Management and Orchestration; Performance Measurements Specification 40

[11] O-RAN White Paper: “O-RAN: Towards an Open and Smart RAN”, October 2018 41

[12] O-RAN-WG4.MP.0-v01.00: O-RAN Alliance Working Group 4 Management Plane Specification 42

Agreement in Annex ZZZ

O-RAN.WG1.OAM-Architecture-v03.00

[13] O-RAN.WG1.O1-Interface.0-v03.00: “O-RAN Operations and Maintenance Interface 1

Specification”. 2

[14] ORAN.WG2.Use Case Requirements v01.00: “O-RAN Working Group 2 (Non-RT RIC & A1 3

interface)”. 4

[15] O-RAN.WG6.CAD-v02.00, “Cloud Architecture and Deployment Scenarios for O-RAN 5

Virtualized RAN” 6

[16] O-RAN.WG6.ORCH-USE-CASES-v01.00, “Orchestration Use Cases for O-RAN Virtualized 7

RAN” 8

[17] O-RAN.WG1-O-RAN Architecture Description - v01.00.00: “O-RAN Architecture Description”. 9

[18] ORAN.WG3.E2GAP.0-v0.1: “O-RAN Working Group 3; Near-Real-time RAN Intelligent 10

Controller Architecture & E2 General Aspects and Principles”. 11

[19] 3GPP TR 28.809 v0.2.0, Study on enhancement of management data analytics 12

1.3 Definitions and Abbreviations 15

1.3.1 Definitions 16

For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following apply. 17

A term defined in the present document takes precedence over the definition of the same term, if any, in 3GPP 18

TR 21.905 [1]. 19

Also, any terms and definitions that are also given in the O-RAN Architecture [17] are intended to be aligned. Text in 20

the O-RAN Architecture [17] takes precedence in case of any difference. 21

near-RT RIC: O-RAN near-real-time RAN Intelligent Controller: a logical function that enables near-real-time control 22

and optimization of O-RAN elements and resources via fine-grained data collection and actions over E2 interface. 23

non-RT RIC: O-RAN non-real-time RAN Intelligent Controller: a logical function that enables non-real-time control 24

and optimization of RAN elements and resources, AI/ML workflow including model training and updates, and policy-25

based guidance of applications/features in near-RT RIC. 26

NMS: A Network Management System for the O-RU as defined in the Open Fronthaul M-Plane [12]. This NMS is an 27

optional part of the SMO. 28

O-Cloud: O-Cloud is a cloud computing platform comprising a collection of physical infrastructure nodes that meet O-29

RAN requirements to host the relevant O-RAN functions 30

O-CU: O-RAN Central Unit: a logical node hosting RRC, SDAP and PDCP protocols 31

O-CU-CP: O-RAN Central Unit – Control Plane: a logical node hosting the RRC and the control plane part of the 32

PDCP protocol 33

O-CU-UP: O-RAN Central Unit – User Plane: a logical node hosting the user plane part of the PDCP protocol and the 34

SDAP protocol 35

O-DU: O-RAN Distributed Unit: a logical node hosting RLC/MAC/High-PHY layers based on a lower layer functional 36

split. 37

O-RU: O-RAN Radio Unit: a logical node hosting Low-PHY layer and RF processing based on a lower layer functional 38

split. This is similar to 3GPP’s “TRP” or “RRH” but more specific in including the Low-PHY layer (FFT/iFFT, PRACH 39

extraction). 40

O1: Interface between the Service Management and Orchestration Framework and O-RAN managed elements (see [17]). 41

O2: Interface between the Service Management and Orchestration Framework and the O-Cloud (see [17]). 42

SMO: Service Management and Orchestration Framework (see [17]). 43

xAPP: An application designed to run on the near-RT RIC. Such an application is likely to consist of one or more 44

microservices and at the point of on-boarding will identify which data it consumes and which data it provides. The 45

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