5G美洲白皮书：5G开源现状（英文版）_28页_1mb

5G Americas Whitepaper Summary

Core Content Overview

This whitepaper from 5G Americas explores the role and applicability of open source in the context of the 3GPP Release 15-defined 5G system architecture. It discusses the benefits of open source for mobile operators, focusing on how it can enhance flexibility, reduce costs, and improve innovation and security. The paper also highlights the relationship between open source and standards development, emphasizing their complementary nature.

Main Points

1. Open Source Model

• Definition: Open source refers to software and hardware that can be shared, modified, and used via an openly available design.
• Licensing: Open source software can be licensed under OSI-approved licenses or bespoke licenses, all of which must comply with the Open Source Definition.
• Governance Models: Governance is crucial for open source success. It can be meritocratic, led by appointed leads, or based on elected members, and must ensure transparency, inclusivity, and balance.
• Standards vs. Open Source: While both standards and open source aim to increase interoperability and reduce costs, they differ in their methods. Standards focus on specifications, while open source emphasizes implementation and community-driven development.

2. 5G Architecture

• Softwarization: 5G is designed with a software-centric approach, enabling greater flexibility and scalability.
• Service-Based Architecture (SBA): A key component of 5G core network, SBA modularizes network functions and aligns with NFV and SDN principles.
• Network Slicing: Allows the creation of multiple logical instances of the 5G core, each optimized for different use cases or customers.
• Control Plane (CP) and User Plane (UP) Separation: A core concept in 5G, this separation supports advanced optimization and enables more efficient resource management.

3. Key 5G Core Network Functions

• Access and Mobility Management Function (AMF): Manages UE access and mobility, terminates NAS signaling, and handles security.
• Session Management Function (SMF): Handles session management, IP address allocation, and UPF tunnel maintenance.
• Policy Control Function (PCF): Provides a unified policy framework using data from the UDR.
• Network Exposure Function (NEF): Exposes network capabilities to other NFs and third parties, using CAPIF for common functionalities.
• Network Repository Function (NRF): Maintains a list of NF instances and their supported services for discovery and roaming.
• Unified Data Management (UDM): Manages authentication and subscription-based access, using UDR for data storage.
• Authentication Server Function (AUSF): Supports UE authentication.
• Application Function (AF): Interacts with core network functions to influence policies or access network capabilities.
• Unified Data Repository (UDR): A centralized repository for subscription, policy, and exposure data.
• Network Slice Selection Function (NSSF): Selects network slices based on UE input and congestion data.
• Network Data Analytics Function (NWDAF): Provides analytics for network optimization and policy enforcement.

4. Open Source Applicability in 5G

• Infrastructure: Open source is critical for enabling scalable, agile, and cost-effective 5G infrastructure. Projects like OCP, DANOS, and P4 are key contributors.
• Radio Network (RAN): Open source supports modular and flexible RAN architectures. The O-RAN Alliance is leading the way in defining open interfaces and promoting interoperability.
• Core Network: Open source plays a vital role in enabling innovation and interoperability in the core network. It supports the development of open APIs, microservices, and new functionalities.
• Convergence: Open source supports non-3GPP access (e.g., Wi-Fi, wireline) through functions like N3IWF, which enables secure interworking between 5G and other access types.
• Management & Control: Open source can improve management and control processes through automation, DevOps, and continuous integration.
• Security: While open source offers transparency and community-driven security improvements, it also introduces potential risks that must be managed carefully.
• Services: Open source can drive innovation in 5G services by enabling rapid development and deployment of new features and applications.
• Considerations for Applicability: Factors such as governance, performance, security, and vendor neutrality must be considered when applying open source to 5G.
• Open Source Efforts: There are numerous ongoing open source projects across all layers of 5G, contributing to the development of core and RAN functions.

Conclusion

Open source is increasingly becoming a key enabler for 5G deployment and innovation. Its integration with 5G architecture offers significant advantages in terms of flexibility, cost, and agility. However, successful adoption requires careful consideration of governance, security, and interoperability. The collaboration between open source initiatives and standards organizations like 3GPP and O-RAN is essential for driving the future of 5G networks.

Key Open Source Projects in 5G

• Open Compute Project (OCP): Promotes open hardware standards for data centers, supporting edge computing in 5G.
• Disaggregated Network Operating System (DANOS): An open and flexible alternative to traditional network operating systems.
• P4: An open-source language for programming network forwarding planes, enabling efficient data processing.
• O-RAN Alliance: Focuses on open RAN architecture, promoting openness and intelligence in wireless networks.
• Data Plane Development Kit (DPDK): Enhances performance and scalability in user plane functions.
• Vector Packet Processing (VPP): Provides high-performance packet processing for 5G.
• Fast Data Input/Output (FD.io): A project aimed at improving data input/output performance.
• Mobile Central Office Re-architected as a Datacenter (M-CORD): Enables cloud-based network functions.
• Open Virtualized Multi-layer Switch (Open vSwitch or OVS): A flexible and open virtual switch for 5G.

References

• The paper references various 3GPP specifications and industry initiatives like O-RAN and the Broadband Forum.
• It also highlights the importance of open APIs and the role of open source in driving innovation and reducing costs.