L2TP-Capable UPF Discovery in 5G Core Session Management
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Solution Overview
Problem
Existing communication networks face challenges in efficiently supporting Layer 2 Tunneling Protocol (L2TP) tunneling across diverse wireless technologies and network architectures, particularly in 5G and LTE environments, leading to inefficiencies in data transmission and management.
Innovation Solution
Implementing a framework that supports L2TP tunneling through a service-based architecture within the core network, utilizing network functions like UPF, SMF, and PCF to manage and optimize L2TP sessions and tunnels, ensuring compatibility across different wireless technologies and network releases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If L2TP tunneling is implemented across diverse wireless technologies and network architectures, then data transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements L2TP tunneling support across multiple wireless technologies (3GPP and non-3GPP access networks) and network architectures (5G Core, EPC, IMS) through a unified framework. The service-based architecture enables the same tunneling mechanism to operate universally across different network releases and access types, eliminating the need for separate implementations for each technology while maintaining efficient data transmission.
Solution Approach 2:
The patent introduces a service-based architecture with intermediary network functions (SMF, PCF, UPF) that mediate between different wireless access technologies and the core network. These intermediary functions provide standardized interfaces and protocols that simplify the integration of L2TP tunneling across diverse network architectures, reducing the overall system complexity while enabling efficient data transmission.
2Adaptability or versatility
If L2TP tunneling is supported across multiple network releases and wireless technologies, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal L2TP tunneling framework that operates across 3GPP and non-3GPP access networks, as well as across different core network types (5G Core, EPC, IMS). The service-based architecture provides a common set of network functions and protocols that can adapt to various network releases and wireless technologies without requiring separate specialized implementations, thereby improving versatility while managing complexity through standardization.
Solution Approach 2:
The patent segments the L2TP tunneling functionality into distinct service-based network functions (SMF for session management, PCF for policy control, UPF for user plane forwarding). This segmentation allows each function to be independently optimized and deployed, making the overall system more adaptable to different network architectures while reducing the complexity burden on individual components through modular design.
3Productivity
If existing L2TP implementation is used in 5G and LTE environments, then ease of operation is maintained, but productivity decreases
Solution Approach 1:
The patent implements self-service mechanisms where the service-based architecture automatically manages L2TP tunneling setup, modification, and teardown based on network conditions and policy requirements. The SMF and PCF functions autonomously negotiate tunnel parameters and enforce policies without requiring manual intervention, thereby maintaining ease of operation while significantly improving data transmission efficiency through optimized tunnel management.
Solution Approach 2:
The patent introduces dynamic L2TP tunneling management where tunnel parameters can be automatically adjusted in response to changing network conditions, traffic patterns, and policy requirements. The service-based architecture enables real-time optimization of tunnel routing, bandwidth allocation, and security parameters, improving data transmission efficiency while maintaining operational simplicity through automated dynamic adaptation.
Data Source
AI summary
A network repository function (NRF) receives, from a session management function (SMF), a discovery request for at least one user plane function (UPF) that supports a layer 2 tunneling protocol (L2TP) tunnel. The NRF determines, in response to the discovery request, a first UPF that supports the L2TP tunnel. The NRF transmits, to the SMF, a discovery response comprising an identity of the first UPF that supports the L2TP tunnel.