Fundamentals of O-RAN

Name: Fundamentals of O-RAN
Price: 111 USD
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ISBN: 9781394206803

by Nishith D. Tripathi, Vijay K. Shah

1st Edition

Publisher: Wiley-IEEE Press

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Telecommunications Engineering

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Book Details

Print ISBN	9781394206803
eText ISBN	9781394206827
Publisher	Wiley-IEEE Press
Publishing Year	2025
Edition	1st Edition
Language	English
Pages	336

Fundamentals of O-RAN, 1st Edition, presents a structured reference examining open radio access network architectures, interface protocols, and system deployment models. The text outlines the technical progression from closed 4G black box equipment toward open, software-centered virtualized RAN (vRAN) implementations. It provides foundational details on key architectural components, including Service Management and Orchestration (SMO), Non-RT RIC, Near-RT RIC, O-CU-CP, O-CU-UP, O-DU, O-RU, and O-Cloud.

The material reviews real-time and non-real-time control loops, microservices, security provisions, and organizational framework within the O-RAN ecosystem. Technical discussions encompass the responsibilities of Work Groups WG1 through WG11, detailing methods for locating and analyzing official WG specification documents. Broader chapters explore active research programs and structural pathways for future 6G network capabilities.

To aid comprehension and instructional utility, the volume integrates theoretical explanations with guided hands-on exercises, chapter review questions, and targeted homework problems. The material is structured for graduate students, faculty members, academic researchers, teachers, practicing engineers, and industry professionals in wireless communications.

Chapter 1: Introduction to O-RAN
- • 1.1 Evolution of Cellular Technologies
- • 1.2 Components of Cellular Systems
- • 1.3 Evolution of the RAN
- • 1.3.1 Horizontal Disaggregation of RAN: A Protocol Perspective
- • 1.4 Introduction to the O-RAN ALLIANCE and the O-RAN Architecture
- • 1.4.1 O-RAN ALLIANCE: A Brief Overview
- • 1.4.2 The O-RAN Architecture in a Nutshell
- • 1.4.3 Groups in the O-RAN ALLIANCE
- • 1.5 Driving Forces Behind O-RAN
- • 1.6 O-RAN Ecosystem
- • 1.7 O-RAN Use Cases
- • 1.7.1 Context-Based Dynamic HO Management for V2X
- • 1.7.2 Flight Path-Based Dynamic UAV Radio Resource Allocation
- • 1.7.3 Radio Resource Allocation for UAV Application Scenario
- • 1.7.4 QoE Optimization
- • 1.7.5 Traffic Steering
- • 1.7.6 Massive MIMO Beamforming Optimization
- • 1.7.7 RAN Sharing
- • 1.7.8 QoS-Based Resource Optimization
- • 1.7.9 RAN Slice SLA Assurance
- • 1.7.10 Multivendor Slices
- • 1.7.11 3GPP 4G/5G Dynamic Spectrum Sharing (DSS)
- • 1.7.12 NSSI Resource Allocation Optimization
- • 1.7.13 Local Indoor Positioning in RAN
- • 1.7.14 Massive MIMO SU/MU-MIMO Grouping Optimization
- • 1.7.15 O-RAN Signaling Storm Protection
- • 1.7.16 Congestion Prediction and Management
- • 1.7.17 Industrial IoT Optimization
- • 1.7.18 BBU Pooling to Achieve RAN Elasticity
- • 1.7.19 Integrated SON Function
- • 1.7.20 Shared O-RU
- • 1.7.21 Energy Saving
- • 1.7.22 MU-MIMO Optimization
- • 1.7.23 Sharing Non-RT RIC Data with the Core
- • 1.7.24 Industrial Vision SLA Assurance
- • 1.7.25 Non-Public Network (NPN) RAN-Sharing via Midhaul for Multioperator Coverage
- • 1.7.26 Interference Detection and Optimization
- • 1.8 O-RAN: Accomplishments, Technical Priorities, and Potential Future Work
- • 1.8.1 O-RAN Accomplishments
- • 1.8.2 O-RAN Technical Priorities
- • 1.8.3 Role of O-RAN Beyond 5G
- • 1.9 Major Takeaways of the Chapter
- • References
Chapter 2: O-RAN Architecture
- • 2.1 O-RAN Logical Architecture
- • 2.2 O-RAN Components: A Closer Look
- • 2.2.1 SMO and Non-RT RIC: A Closer Look
- • 2.2.1.1 SMO Support for FCAPS to O-RAN Network Functions
- • 2.2.1.2 SMO: O-Cloud Management, Orchestration, and Workflow Management
- • 2.2.1.3 Non-RT RIC
- • 2.2.1.4 Logical Functions in the Non-RT RIC Framework or the SMO Framework
- • 2.2.2 Near-RT RIC
- • 2.2.3 O-CU-CP
- • 2.2.4 O-CU-UP
- • 2.2.5 O-DU
- • 2.2.6 O-RU
- • 2.2.7 O-eNB
- • 2.2.8 O-Cloud
- • 2.3 O-RAN Interfaces: A Closer Look
- • 2.3.1 O1 Interface
- • 2.3.2 O2 Interface
- • 2.3.3 A1 Interface
- • 2.3.3.1 A1 Policies and A1 Policy Management
- • 2.3.3.2 A1 Enrichment Information (EI) and A1 EI Service
- • 2.3.3.3 ml Model Management Service
- • 2.3.3.4 A1 Interface Protocol Stack
- • 2.3.4 E2 Interface
- • 2.3.5 Open FH Interface
- • 2.3.5.1 M-Plane: A Closer Look
- • 2.3.5.2 CUS-Plane: A Closer Look
- • 2.3.6 O-Cloud Notification Interface
- • 2.3.7 CTI (Cooperative Transport Interface)
- • 2.3.8 3GPP Interfaces Relevant to O-RAN
- • 2.4 Functional Split 7.2x
- • 2.5 Inside O-RAN Domain: Functional Distribution Between O-RAN and Other SDOs
- • 2.6 O-RAN Deployment Scenarios
- • 2.6.1 Hierarchical Cloud Architecture
- • 2.6.2 O-RAN Cloud Deployment Scenarios
- • 2.6.3 Example Mapping of O-RU Functions to Hierarchical O-RAN Cloud Architecture
- • 2.7 Major Takeaways of the Chapter
- • References
Chapter 3: O-RAN Applications: xApps and rApps
- • 3.1 O-RAN Control Loops
- • 3.2 Near-RT Control Loop: Near-RT RIC and xApps
- • 3.2.1 Near-RT Internal Components of the Near-RT RIC
- • 3.2.2 Open-Source Near-RT RIC Implementations
- • 3.3 Near-RT RIC xApps: Enabling RAN Customization
- • 3.3.1 Defining xApps
- • 3.3.2 Embracing Evolving Standards
- • 3.4 E2 Interface: Empowering RAN Control and Data Exchange
- • 3.4.1 E2 Application Protocol (E2AP)
- • 3.4.2 E2 Service Models
- • 3.5 xApp Use Cases
- • 3.5.1 KPIMON xApp
- • 3.5.2 RAN Slicing xApp
- • 3.5.2.1 RAN Slicing Configuration and Resource Allocation
- • 3.5.2.2 Throughput Performance
- • 3.6 Machine Learning (ML)-Based xApps
- • 3.6.1 AI/ML Workflow
- • 3.6.1.1 Data Collection and Processing
- • 3.6.1.2 Training
- • 3.6.1.3 Validation and Publishing
- • 3.6.1.4 Deployment
- • 3.6.1.5 AI/ML Execution and Inference
- • 3.6.1.6 Continuous Operations
- • 3.6.2 Example ML-Based xApp Use Cases
- • 3.7 xApp Workflow
- • 3.8 xApp Development: A Closer Look
- • 3.8.1 Undeployment/Removal of xApps
- • 3.9 Non-RT Closed Loop: Non-RT RIC and rApps
- • 3.9.1 Requirements for the Non-RT RIC Framework
- • 3.9.2 Non-RT RIC Architecture
- • 3.9.2.1 A1 Interface: General Principles
- • 3.9.2.2 Role of the A1 Interface
- • 3.9.2.3 A1-P Management Service (A1-P)
- • 3.9.2.4 A1 Enrichment Information Service (A1-EI)
- • 3.9.2.5 A1 ML Model Management Service (A1-ML)
- • 3.9.3 R1 Interface
- • 3.9.3.1 R1 Service Definitions
- • 3.9.4 Service Management and Orchestration
- • 3.9.5 rApp Use Cases
- • 3.9.5.1 Traffic Steering Use Case
- • 3.9.5.2 QoE Use Case
- • 3.9.5.3 Operational Flow
- • 3.10 Real-Time RIC Closed Loop: RT RIC and μApps/dApps
- • 3.10.1 Resource Block (RB) Scheduling μApp
- • 3.10.1.1 Workflow for a RB Scheduling μApp
- • 3.10.1.2 Other Features and Future Directions
- • 3.10.2 Beam Management dApp Use Case
- • 3.10.2.1 Key Elements and Their Functions
- • 3.10.2.2 Operational Flow for Beam Management
- • 3.11 Multi-time-scale RIC Framework
- • 3.11.1 Use Case: SPARC for Multi-Site Spectrum Management
- • 3.11.2 Key Elements and Operational Flow for SPARC Framework
- • 3.12 Major Takeaways of the Chapter
- • References
Chapter 4: O-RAN Security
- • 4.1 Motivation for O-RAN Security
- • 4.1.1 Vulnerabilities of O-RAN Compared to Non-O-RAN Implementations
- • 4.1.2 Scope of O-RAN Security Specifications
- • 4.1.2.1 Within O-RAN Security Scope
- • 4.1.2.2 Outside O-RAN Security Scope
- • 4.1.3 Critical Assets
- • 4.1.3.1 Critical Data Assets
- • 4.1.3.2 Critical Component Assets
- • 4.1.4 Protection Levels
- • 4.2 Methodology of O-RAN Security Analysis
- • 4.2.1 Stage 1: Risk Identification
- • 4.2.2 Stage 2: Risk Assessment
- • 4.2.3 Stage 3: Risk Treatment
- • 4.3 Threat Model
- • 4.3.1 Building Blocks of the Threat Model
- • 4.3.2 An Overview of O-RAN Security Threats
- • 4.3.2.1 Threats Against O-RAN System
- • 4.3.2.2 Threats Against O-Cloud
- • 4.3.2.3 Threats to Open-Source Code
- • 4.3.2.4 Physical Threats
- • 4.3.2.5 Threats Against 5G Radio Networks
- • 4.3.2.6 Threats Against ML System
- • 4.3.2.7 Protocol Stack Threats
- • 4.3.3 O-RAN Threat Agents
- • 4.3.4 Potential Security Vulnerabilities of O-RAN
- • 4.4 Risk Assessment
- • 4.4.1 Key Elements of Risk Assessment
- • 4.4.2 O-RAN Risk Assessment Analysis: A Brief Overview
- • 4.5 Security Principles, Security Requirements, and Security Controls in O-RAN
- • 4.5.1 O-RAN Security Principles
- • 4.5.2 Security Requirements for O-RAN
- • 4.5.3 Security Controls for O-RAN
- • 4.6 O-RAN Security Protocols
- • 4.6.1 Security Protocols in a Nutshell
- • 4.6.2 SSH
- • 4.6.3 TLS
- • 4.6.4 DTLS
- • 4.6.5 NETCONF over Secure Transport
- • 4.6.6 IPsec
- • 4.6.7 CMPv 2
- • 4.6.8 OAuth 2.0
- • 4.7 O-RAN Security Testing
- • 4.7.1 Tools for O-RAN Security Testing
- • 4.7.2 Test Report Template
- • 4.7.3 Security Testing Framework
- • 4.7.3.1 Security Protocol Validation
- • 4.7.3.2 Common Network Security Tests and System Security Tests for O-RAN Components
- • 4.7.3.3 Software Security Evaluation
- • 4.7.3.4 Open Fronthaul Security Validation
- • 4.7.3.5 Validation of O-RAN-Component-Specific Security Protection Mechanisms
- • 4.7.3.6 Security Testing of xApps and rApps
- • 4.7.3.7 Validation of Miscellaneous Components
- • 4.8 Major Takeaways of the Chapter
- • References
Chapter 5: O-RAN Ecosystem
- • 5.1 Internal and External O-RAN Ecosystems
- • 5.2 Internal O-RAN Ecosystem
- • 5.2.1 Work Groups of O-RAN Specification Efforts
- • 5.2.1.1 WG1 Work Products
- • 5.2.1.2 WG2 Work Products
- • 5.2.1.3 WG3 Work Products
- • 5.2.1.4 WG4 Work Products
- • 5.2.1.5 WG5 Work Products
- • 5.2.1.6 WG6 Work Products
- • 5.2.1.7 WG7 Work Products
- • 5.2.1.8 WG8 Work Products
- • 5.2.1.9 WG9 Work Products
- • 5.2.1.10 WG10 Work Products
- • 5.2.1.11 WG11 Work Products
- • 5.2.2 Focus and Research Groups of O-RAN
- • 5.2.3 Testing and Integration Entities
- • 5.2.4 O-RAN Demonstrators and O-RAN Field Trials and Developme