Sidelink LBT Failure Feedback for SL-U Resource Reconfiguration
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Solution Overview
Problem
In sidelink unlicensed (SL-U) communication scenarios, user equipment (UE) experiences consistent listen-before-talk (LBT) failures due to resource contention on unlicensed bands, leading to poor communication performance.
Innovation Solution
A terminal sends target information to a network-side device when a consistent LBT failure is detected, indicating the failure during sidelink SL transmission, allowing the network-side device to reconfigure SL resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminal performs sidelink transmission on unlicensed bands, then direct communication between terminals is enabled, but listen-before-talk failures occur due to resource contention
Solution Approach 1:
The terminal feeds back LBT failure information to the network-side device when consistent LBT failures are detected. This feedback mechanism enables the network to understand the channel conditions and adjust resource allocation accordingly, resolving the contradiction by allowing SL transmission while managing LBT failures through network control.
Solution Approach 2:
The network-side device changes resource allocation parameters (time-frequency resources, resource pools) based on LBT failure feedback. By dynamically adjusting these parameters, the system maintains SL communication capability while adapting to changing channel conditions that cause LBT failures.
2Reliability
If terminal detects consistent LBT failure and stops transmission, then further LBT failures are avoided, but communication performance deteriorates
Solution Approach 1:
Instead of stopping transmission, the terminal provides feedback about LBT failures to the network. This allows the system to maintain communication productivity while improving reliability through network-side resource reconfiguration based on the feedback information.
Solution Approach 2:
The terminal autonomously detects LBT failures and reports them, enabling the network to self-adjust resource allocation. This self-service mechanism maintains communication performance while avoiding persistent LBT failures through intelligent resource management.
3Productivity
If network reconfigures SL resources based on LBT failure feedback, then communication performance improves, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential LBT failure indication information from the terminal and sends it to the network. By taking out only the necessary feedback data rather than complete channel state information, the system improves communication performance while minimizing signaling overhead.
Solution Approach 2:
The terminal creates a simplified copy of the LBT failure status (binary indication of failure occurrence) rather than transmitting detailed channel measurements. This copying approach enables effective resource reconfiguration while keeping signaling overhead low.
Data Source
AI summary
This application discloses an information sending method and apparatus, an information receiving method and apparatus, a terminal, and a network-side device. The information sending method of an embodiment of this application includes: sending, by a terminal, target information to a network-side device upon detecting a consistent listen-before-talk LBT failure on a target object, where the target information is used to indicate that the terminal has detected a consistent LBT failure during sidelink SL transmission.