AMF Emergency Session Identification During 5GS Mobility
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Solution Overview
Problem
Current 3GPP specifications do not clearly define how the Access Management Function (AMF) can determine if a User Equipment (UE) is emergency attached/registered or if a Protocol Data Unit (PDU) session is for emergency service during EPS to 5GS mobility or intra-5GS inter-AMF mobility, leading to potential failure of emergency service session continuity.
Innovation Solution
The AMF determines if a data network identifier is an emergency one by comparing it with emergency configuration data, generating and storing an emergency indication, and using this indication to establish and maintain emergency services during mobility scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the AMF does not determine emergency service status during mobility, then the system operation is simple, but emergency service session continuity cannot be ensured
Solution Approach 1:
The AMF proactively determines whether the UE is in emergency attached/registered state or whether a PDU session is for emergency service before mobility execution. This preliminary determination includes checking if the UE is authenticated, comparing DNN values against emergency configuration data, and identifying emergency service status in advance, thereby ensuring session continuity during subsequent mobility procedures.
Solution Approach 2:
The patent introduces an emergency indication as an intermediary element that carries emergency service status information between network entities. This indication is generated by the AMF based on determination results and transmitted to other entities (such as target AMF or MME) to facilitate coordinated emergency service handling during mobility without requiring complex direct communication protocols.
2Measurement precision
If the AMF checks all PDU sessions for emergency status, then emergency services are accurately identified, but signaling overhead increases
Solution Approach 1:
The patent extracts only the critical identification elements (DNN values from PDU session information) for emergency status determination, rather than processing complete PDU session details. The AMF compares these extracted DNN values against emergency configuration data to identify emergency services, thereby reducing signaling processing overhead while maintaining identification accuracy.
Solution Approach 2:
The emergency determination process applies different processing depths to different PDU sessions based on local characteristics. The AMF focuses detailed verification only on sessions with DNN values matching emergency configuration data, while other sessions receive minimal processing, thereby optimizing the balance between identification accuracy and signaling overhead.
Data Source
AI summary
The present disclosure concerns managing mobility and emergency handling by receiving a mobility message from a second entity for managing access and mobility, wherein the mobility message carries a data network identifier for an IP connectivity; determining that the data network identifier in the received mobility message is an emergency data network identifier, based on emergency data network identifiers contained in emergency configuration data with which the first entity for managing access and mobility is configured; and determining that the IP connectivity is established for an emergency service.