PC5 C2 Connection Switching for Reliable UE Communication
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Solution Overview
Problem
Existing communication systems in 3GPP LTE and NR lack efficient methods for switching between direct UE-to-UE communication via PC5 and network-based communication, which is necessary for various usage scenarios and deployment scenarios including enhanced mobile broadband, massive machine-type-communications, and ultra-reliable and low latency communications.
Innovation Solution
A method for the first UE to measure signal strength of the C2 connection over PC5 and decide whether to disconnect or switch to a network-based C2 connection, enabling seamless transitions between direct and network-assisted communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If direct C2 connection via PC5 is used, then communication latency is reduced and communication efficiency is improved, but connection reliability deteriorates when signal strength is insufficient
Solution Approach 1:
The patent implements dynamic switching between direct C2 connection via PC5 and network-based C2 connection based on real-time signal strength measurement. The UE autonomously decides whether to maintain direct connection or switch to network connection, making the communication path adaptive and flexible rather than fixed, thus resolving the contradiction between communication efficiency and connection reliability
Solution Approach 2:
The network acts as an intermediary option when direct PC5 connection becomes unreliable. The UE can switch to network-based C2 connection as a backup path, ensuring continuous communication availability. This intermediary mechanism allows the system to maintain reliability without permanently sacrificing the efficiency benefits of direct connection
2Reliability
If switching mechanism between direct and network-based C2 connection is added, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The UE performs autonomous decision-making for connection switching based on its own signal strength measurements without requiring complex network-side coordination or manual intervention. The UE independently measures signal strength, compares it against thresholds, and initiates switching procedures, simplifying the overall system architecture while maintaining high reliability
Solution Approach 2:
The patent uses signal strength as a simple, measurable parameter to trigger connection switching. By monitoring this physical parameter and comparing it against predefined thresholds, the system achieves reliable switching without complex decision algorithms or multiple evaluation criteria, thus minimizing device complexity
3Adaptability or versatility
If signal strength measurement and autonomous switching decision is implemented, then communication flexibility is improved, but processing time increases
Solution Approach 1:
The UE continuously monitors signal strength in advance and pre-configures switching thresholds and procedures before actual communication occurs. When signal degradation is detected, the switching decision can be executed quickly because the framework and criteria are already established, reducing the processing time required for autonomous switching decisions during active communication
Data Source
AI summary
One disclosure of the present specification provides a method by which a UE performs. The method comprises steps in which: C2 communication is performed with a second UE through a command and control (C2) connection over PC5; the signal strength of the C2 connection over the PC5 is measured; an uncrewed aerial system (UAS) layer of a first UE transmits C2 connection state information to an application layer of the first UE, the C2 connection state information including information related to the measured signal strength of the C2 connection over the PC5; and whether to i) switch the C2 connection over the PC5 to a C2 connection over a network or ii) release the C2 connection over the PC5 is determined on the basis of a request for the application layer of the first UE based on the C2 connection state information.