Sidelink Radio Link Failure Detection with PSFCH LBT Filtering
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Solution Overview
Problem
The frequent triggering of sidelink radio link failures due to the inability to detect PSFCH feedback caused by LBT failures in unlicensed spectrum sidelink communication affects communication quality.
Innovation Solution
A method and apparatus that detect PSFCH feedback on associated resources and update a detection variable to count consecutive DTXs, distinguishing LBT failures by using RSSI, CO, and CBR measurements to avoid unnecessary sidelink radio link failure triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LBT is performed on unlicensed spectrum for sidelink communication, then spectrum utilization is improved, but PSFCH feedback detection fails frequently causing sidelink radio link failure
Solution Approach 1:
The patent segments the PSFCH resources into multiple individual resources associated with a single PSSCH. Instead of treating feedback detection as a single event, the system divides it into multiple independent detection opportunities across different PSFCH resources, allowing the UE to detect feedback successfully even if LBT fails on some resources.
Solution Approach 2:
The patent performs preliminary actions by configuring multiple PSFCH resources in advance before sidelink communication occurs. The network configures the UE with multiple potential feedback resources, so when communication happens, the UE already has pre-prepared detection opportunities, reducing the impact of LBT failures.
2Difficulty of detecting and measuring
If consecutive DTX detection is used to identify radio link failure, then failure detection capability is improved, but false triggering due to LBT failures increases
Solution Approach 1:
The patent changes the parameter of feedback resource quantity from single to multiple. By increasing the number of PSFCH resources, the system modifies the detection parameters such that LBT failures on individual resources do not lead to consecutive DTX conditions, thereby preventing false radio link failure triggering while maintaining genuine failure detection capability.
3Reliability
If multiple PSFCH resources are configured for a single PSSCH, then feedback detection reliability is improved, but resource overhead increases
Solution Approach 1:
The patent makes PSFCH resources multi-functional by having multiple PSFCH resources serve a single PSSCH. These resources can be used for different purposes: some for initial feedback, others as backup resources, and they can be dynamically selected based on LBT outcomes, maximizing the utility of each resource while improving reliability.
Data Source
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AI summary
The present disclosure relates to the technical field of communications. Provided are sidelink radio link failure processing methods and apparatus. According to the sidelink radio link failure processing methods and apparatus provided in the present disclosure, a terminal device can analyze whether failure to detect PSFCH feedback is affected by an LBT failure, and does not update the current value of a detection variable when determining the failure to detect PSFCH feedback is related to the LBT failure, or otherwise allows the detection variable to be updated. The present disclosure can mitigate sidelink radio link failures caused by the effects of LBT, thereby ensuring the communication quality.