Sidelink LBT Feedback for Unlicensed Resource Re-Scheduling
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Solution Overview
Problem
Existing communication systems fail to effectively manage SL transmission resources on unlicensed spectrum, leading to interference and communication failures due to the lack of LBT success, which the network device cannot detect.
Innovation Solution
A method where a sending UE performs LBT on SL transmission resources and sends indication information to the network device based on the LBT result, allowing the network device to re-schedule resources if LBT fails, ensuring successful communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the network device schedules SL transmission resources on unlicensed spectrum to the UE, then resource utilization is improved, but communication reliability deteriorates due to undetected LBT failures
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends LBT result indication information back to the network device. This allows the network device to know whether the UE successfully performed LBT and can re-schedule resources accordingly, resolving the reliability issue while maintaining high resource utilization through efficient re-scheduling of failed transmissions
Solution Approach 2:
The patent applies preliminary action by having the UE perform LBT before actual SL transmission and report the result to the network device in advance. This allows the network device to proactively re-schedule resources if LBT fails, preventing communication failures before they occur and ensuring reliable resource utilization
2Object-affected harmful factors
If the UE performs LBT on scheduled SL transmission resources, then interference avoidance is improved, but communication efficiency deteriorates due to undetected transmission failures
Solution Approach 1:
The feedback mechanism enables the network device to receive LBT result information from the UE and efficiently re-schedule resources. This maintains interference avoidance benefits while improving communication efficiency by eliminating wasted transmission opportunities and enabling prompt re-scheduling of failed transmissions
3Device complexity
If the network device does not know the LBT status of the UE, then device complexity is reduced, but resource management efficiency deteriorates
Solution Approach 1:
The UE autonomously performs LBT and self-determines the LBT result, then reports it to the network device. This self-service approach allows the network device to maintain simple complexity while achieving efficient resource management through accurate LBT status information for optimal re-scheduling decisions
Data Source
AI summary
An indication method is performed by a first user equipment (UE), and includes: receiving at least one sidelink (SL) transmission resource for SL transmission on an unlicensed spectrum scheduled by a network device; performing listen-before-talk (LBT) on the SL transmission resource; and sending indication information to the network device based on a performing result of the LBT, wherein the indication information is configured to indicate whether the first UE performs the SL transmission on the SL transmission resource.