Service-Based PWSF for 5G Core Legacy Compatibility
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Solution Overview
Problem
Current public warning systems in 5G networks face challenges in adapting to service-based architectures while maintaining compatibility with legacy network elements, requiring a flexible and adaptive solution for efficient warning message delivery and cancellation.
Innovation Solution
A service-based public warning system function (PWSF) is implemented within the 5G core network, utilizing service-based interfaces to reuse existing protocols and support next-generation radio access network (NG-RAN) failure and restart indications, enabling efficient warning message delivery and cancellation through the Core Access and Mobility Management Function (AMF) and Cell Broadcast Center (CBC) integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a service-based architecture is implemented in 5G core network, then reusability and scalability of network functions are improved, but compatibility with legacy network elements becomes more difficult to maintain
Solution Approach 1:
The patent introduces a service-based interface layer (Npwsf, Namf) as an intermediary between the 5G core network and legacy CBC network elements. This intermediary layer enables service-based communication while maintaining compatibility with existing legacy interfaces, allowing the system to benefit from service-based architecture without losing legacy compatibility.
Solution Approach 2:
The PWSF network function is designed to perform multiple functions: it handles both service-based interface communications with 5G core network elements and legacy interface communications with CBC network elements. This multi-functionality allows a single component to bridge the gap between new and old systems, reducing overall system complexity.
2Device complexity
If service-based interfaces are used for PWS message delivery, then interface simplification and modularity are improved, but integration with legacy point-to-point reference models becomes more complex
Solution Approach 1:
The patent segments the communication interface into distinct service-based interfaces (Npwsf between PWSF and CBC, Namf between AMF and PWSF) that operate independently. This segmentation allows each interface to be optimized for its specific function while maintaining overall system integration, simplifying the interface design without reducing integration flexibility.
Solution Approach 2:
The service-based interface architecture enables dynamic service subscription and notification mechanisms where network functions can dynamically subscribe to PWS services and receive notifications. This dynamic behavior provides integration flexibility while maintaining interface simplification through standardized service procedures.
3Reliability
If legacy CBC network elements are reused, then operational continuity is maintained, but support for next-generation NG-RAN failure and restart indications becomes limited
Solution Approach 1:
The PWSF network function acts as an intermediary that receives next-generation NG-RAN failure and restart indications via service-based interfaces and translates/adapts them for communication with legacy CBC network elements. This allows the system to support new 5G features while maintaining compatibility with legacy infrastructure.
Solution Approach 2:
The system changes the communication parameters and interface protocols between different network layers. Service-based interfaces use modern protocol parameters for NG-RAN failure indication, while legacy interfaces maintain original parameters for CBC compatibility. The PWSF translates between these parameter sets, enabling both old and new features to coexist.
Data Source
AI summary
A method, apparatus and computer program product are provided for performing a public warning system (PWS) function. In the context of a method, a warning message is received via a first interface. The warning message is provided by a cell broadcast entity. The method includes transforming the warning message. The method further includes causing the warning message, as transformed, to be transmitted via a second interface, different than the first interface, to an access and mobility management function (AMF) for transmission to a radio access network.