AMF Mobility Event Notification for UAS Handover Awareness
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Solution Overview
Problem
Current 5G technologies lack a mechanism for Uncrewed Aircraft Systems (UAS) Network Functions to be aware of mobility events, such as handovers from one Access Mobility and Management Function (AMF) to another, leading to issues in UAV Authentication and Authorization procedures due to lack of coordination between old and new AMFs.
Innovation Solution
Implementing mobility event notification mechanisms that allow the UAS Network Function to update its local context during handovers, with the new AMF triggering UUAA Registration procedures and subscribing or unsubscribing to mobility event notifications as necessary, ensuring awareness of handovers and maintaining accurate UUAA context.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobility event notification mechanisms are implemented, then awareness of handovers is improved, but device complexity increases
Solution Approach 1:
The system performs preliminary actions by having the new AMF proactively subscribe to mobility event notifications before handover completion, ensuring awareness is established in advance. This prevents coordination issues by preparing the notification mechanism beforehand rather than reacting after the problem occurs.
Solution Approach 2:
The patent implements feedback mechanisms where the new AMF receives mobility event notifications from the old AMF, creating a closed-loop system that confirms handover completion and maintains accurate UUAA context. This feedback ensures reliability by verifying that the new AMF has proper awareness of mobility events.
2Reliability
If the new AMF subscribes to mobility event notifications, then coordination between AMFs is improved, but loss of time increases
Solution Approach 1:
The new AMF subscribes to mobility event notifications as a preliminary action during the handover setup phase, before actual handover execution. This timing ensures coordination is established in advance, preventing delays that would occur if subscription happened after handover completion.
Solution Approach 2:
The subscription mechanism is dynamic and conditional - the new AMF subscribes only when needed (upon receiving mobility event) and can unsubscribe when no longer required. This dynamic approach optimizes timing by activating coordination mechanisms only during critical handover periods rather than maintaining continuous subscriptions.
3Reliability
If the UAS Network Function updates its local context during handovers, then authentication and authorization processes are improved, but device complexity increases
Solution Approach 1:
The UAS Network Function performs self-service by automatically updating its own local context using mobility event notifications it receives. The system updates its UUAA context autonomously based on incoming notifications without requiring external intervention, simplifying the overall architecture while maintaining reliability.
Solution Approach 2:
The local context update mechanism uses feedback from mobility event notifications to maintain accurate UUAA state. Each notification triggers a corresponding context update, creating a reliable feedback loop that ensures authentication and authorization data remains synchronized with actual mobility events.
Data Source
AI summary
A computer-implemented method for subscribing or unsubscribing to mobility event notifications, a system, and a non-transitory computer-readable storage medium are provided by the present application. The computer-implemented method includes: determining a mobility event associated with a user equipment (UE); generating a request to subscribe to the mobility event notifications or to unsubscribe from the mobility event notifications in response to the mobility event; sending the request; receiving a response in response to the request; and acknowledging subscribing or unsubscribing to the mobility event notifications based on the response.