AMF Altitude Event Handling for UAS Mobility Management
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Solution Overview
Problem
Existing wireless communication systems lack efficient mechanisms to manage and respond to altitude changes of wireless devices, particularly in the context of unmanned aerial systems (UAS), which can impact network connectivity and resource allocation.
Innovation Solution
Implementing a method within the Access and Mobility Management Function (AMF) to receive altitude change reports from base stations and notify the Network Exposure Function (NEF) when a threshold is exceeded, enabling height-based event notifications and improved network management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing wireless communication systems manage wireless devices without altitude-based mechanisms, then system complexity remains low, but network management effectiveness for UAS deteriorates
Solution Approach 1:
The system pre-configures altitude thresholds and event notification mechanisms in the AMF before UAS operations begin. When a wireless device reports its altitude, the system can immediately evaluate against pre-set thresholds and trigger appropriate notifications, eliminating the need for complex real-time decision-making logic
Solution Approach 2:
The AMF acts as an intermediary between the base station (receiving altitude data) and external applications (needing altitude information). It subscribes to altitude events, receives location reports, evaluates threshold conditions, and forwards notifications through the NEF to external systems, simplifying the overall architecture by centralizing altitude management functionality
2Measurement precision
If the system continuously monitors all wireless device locations, then measurement precision is high, but energy consumption increases
Solution Approach 1:
Instead of continuous monitoring, the system uses periodic location reporting triggered by altitude changes. The base station receives location reports from wireless devices and evaluates whether altitude thresholds have been crossed, triggering notifications only when necessary. This event-driven approach reduces energy consumption while maintaining precise altitude detection capability
Solution Approach 2:
The system changes the monitoring parameter from continuous location tracking to threshold-based event triggering. By setting altitude thresholds and only activating monitoring when these thresholds are crossed, the system achieves precise altitude measurement when needed while minimizing overall energy consumption through selective monitoring
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3
AI summary
A mobility management function receives, from a base station, a location report indicating that an altitude of a wireless device is changed based on a threshold. The mobility management function sends, to a core network node, a message notifying an altitude change of the wireless device.