UAV Terminal Control for PC5 A2X Timer-Based Path Switching
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Solution Overview
Problem
The 5G System (5GS) lacks clear procedures and behaviors for Aircraft-to-anything (A2X) communication between Uncrewed Aerial Vehicles (UAVs) that do not include a Universal Integrated Circuit Card (UICC), particularly regarding radio parameter configurations.
Innovation Solution
A terminal apparatus for UAVs is equipped with a controller and storage unit that manages radio parameters, including geographical area, altitude range, and validity timers, to facilitate A2X communication via PC5 and transition to Uu communication when validity timers expire.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If A2X communication via PC5 is used for UAVs without UICC, then direct communication between UAVs is enabled, but the communication path becomes unstable when validity timer expires
Solution Approach 1:
The patent applies preliminary action by pre-configuring radio parameters including geographical area, altitude range, and validity timer before A2X communication begins. The controller is prepared to automatically switch communication paths when the validity timer expires, ensuring continuous reliable communication without manual intervention.
Solution Approach 2:
The patent implements dynamics by enabling the communication path to change from PC5 direct communication to Uu network communication based on the validity timer status. The system dynamically adapts the communication mode according to the expiration state of the validity timer, maintaining reliability while preserving the ease of direct UAV-to-UAV communication.
2Reliability
If radio parameters are configured with validity timer, then communication path can be managed, but additional control procedures are required when timer expires
Solution Approach 1:
The patent applies self-service by enabling the UAV's controller to automatically manage the communication path transition when the validity timer expires. The system autonomously switches from PC5 to Uu communication without external control, reducing the complexity of manual control procedures while maintaining reliable communication path management.
Solution Approach 2:
The patent implements feedback by using the validity timer as a time-based trigger mechanism that automatically initiates communication path switching when expired. This feedback loop ensures the system responds appropriately to the expiration state, managing communication paths reliably through automated timing-based control.
3Productivity
If PC5 communication is used for A2X services, then direct UAV-to-UAV communication is achieved, but network control and management is reduced
Solution Approach 1:
The patent applies dynamics by creating a flexible communication system that can switch between PC5 direct communication for high efficiency and Uu network communication for enhanced network control. The validity timer mechanism dynamically determines which mode to use, maintaining both communication efficiency and network control flexibility.
Solution Approach 2:
The patent implements universality by enabling the UAV communication system to perform multiple functions through a single framework: direct PC5 communication for efficiency, network-controlled Uu communication for management, and automated transition between modes. This multi-functional approach satisfies both productivity and adaptability requirements.
Data Source
AI summary
In a case that a terminal apparatus does not include a UICC and is not authorized to use A2X communication, the terminal apparatus transmits a direct link establishment reject message. In a case that a validity timer expires, the terminal apparatus stops the A2X communication via PC5.