UE-to-UE Relay Path Switching Using PC5 Signal Measurements
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing direct and indirect path switching in UE-to-UE relays, particularly in scenarios requiring high reliability and low latency, such as vehicle-to-everything (V2X) communications, which can lead to unnecessary relay operations and suboptimal resource utilization.
Innovation Solution
A method for UE-to-UE relay operations involving establishing a PC5 link with a relay UE, performing signal measurements, and comparing these measurements with predetermined thresholds to determine when direct path switching to the first UE is feasible, thereby optimizing the use of relay resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE-to-UE relay is used for communication, then coverage and connectivity are improved, but relay operations become unnecessary and resource utilization becomes suboptimal
Solution Approach 1:
The system performs preliminary measurements of reference signals from both direct and relay paths before actual data transmission. By pre-comparing signal strengths and predicting path quality, the system determines whether direct or relay path switching should be used in advance, avoiding unnecessary relay operations and optimizing resource utilization while maintaining communication reliability
2Adaptability or versatility
If direct path switching is frequently attempted, then path optimization is improved, but measurement and control complexity increases
Solution Approach 1:
The system introduces a relay UE as an intermediary that assists in measuring and reporting reference signal information. Instead of the communicating UEs directly performing complex measurements and comparisons, the relay UE acts as a mediator that collects measurement data and facilitates the path switching decision, thereby reducing the complexity burden on the communicating UEs while maintaining path optimization capabilities
Data Source
AI summary
An embodiment relates to a method for operating a second UE related to a user equipment (UE)-to-UE relay in a wireless communication system, the method comprising: establishing, by the second UE, a PC5 link with a first UE through a relay UE; transmitting and receiving, by the second UE, data to and from the first UE through the relay UE; and performing, by the second UE, a second measurement on a signal between the second UE and the relay UE, wherein, on the basis of the second UE receiving a result of a first measurement on a signal between the relay UE and the first UE from the relay UE, the second UE may compare the result of the first measurement and a result of the second measurement with a predetermined threshold value so as to attempt direct path switching to the first UE.