Sidelink Communication Quality Monitoring for LBT Triggering
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Solution Overview
Problem
Current C-V2X communication in licensed bands faces reliability and latency issues due to external obstacles and interference from adjacent unlicensed bands, necessitating a method to ensure data quality and perform listen-before-talk (LBT) procedures.
Innovation Solution
A user equipment (UE) is configured with a transceiver and processor to identify the quality of sidelink communication and perform an LBT procedure when the quality is less than or equal to a reference value during sidelink communication in the licensed band, mitigating interference and ensuring reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If C-V2X communication is performed in licensed band, then communication reliability is improved, but interference from unlicensed band may still occur causing communication quality degradation
Solution Approach 1:
The patent applies the LBT (Listen Before Talk) procedure as a preliminary action before transmitting data in the licensed band. The UE measures the quality of sidelink communication and, when quality degradation is detected (indicating interference from unlicensed band), performs the LBT procedure in advance to check channel availability and avoid collision, thereby maintaining communication reliability despite the presence of harmful interference.
2Reliability
If LBT procedure is performed continuously to mitigate interference, then communication quality is improved, but transmission latency increases
Solution Approach 1:
The patent dynamically adjusts the execution of LBT procedure based on real-time channel quality conditions. Instead of continuously performing LBT, the UE measures sidelink communication quality and only initiates LBT when the quality falls below a threshold, indicating interference presence. This dynamic adaptation ensures communication quality improvement while minimizing unnecessary LBT operations that would increase latency.
Solution Approach 2:
The patent changes the operational parameter of LBT execution from a static continuous mode to a conditional mode based on measured communication quality parameters. By monitoring quality metrics and adjusting LBT execution accordingly, the system optimizes the trade-off between communication quality (reliability) and transmission latency, performing LBT only when quality degradation is detected.
3Productivity
If data transmission is performed without checking channel quality, then transmission speed is improved, but communication errors increase due to interference
Solution Approach 1:
The patent performs quality measurement and LBT procedure as preliminary actions before data transmission. By measuring sidelink communication quality and executing LBT in advance when interference is detected, the system ensures that data transmission only proceeds when channel conditions are favorable, thereby reducing communication errors while maintaining efficient transmission speed through conditional rather than continuous checking.
Data Source
AI summary
According to various embodiments, a first user equipment (UE) includes a transceiver to transmit and receive a wireless signal; and a processor connected with the transceiver, wherein the processor is configured to identify a value related to quality of sidelink communication while the first UE performs sidelink communication in licensed band with a second UE, determine to perform a listen before talk (LBT) procedure on a condition that the value related to the quality of the sidelink communication is less than or equal to a reference value, and perform the LBT procedure during performing the sidelink communication in the licensed band.