Sidelink LBT Failure Detection for Unlicensed Resource Re-Allocation
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Solution Overview
Problem
The existing LBT failure detection mechanism for sidelink communication on unlicensed frequency spectrum is imperfect, leading to consecutive failures and affecting communication efficiency.
Innovation Solution
A method and apparatus for determining a persistent LBT failure by identifying a first transmission resource and setting a statistical number threshold to detect persistent LBT failures, with mechanisms for resource re-allocation and timer management to improve detection accuracy and communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT is used for sidelink transmission on unlicensed frequency, then interference between terminals is avoided, but LBT failure detection mechanism is imperfect leading to consecutive failures
Solution Approach 1:
The patent implements a feedback mechanism where the terminal monitors LBT failure events and reports them to the network device. The network device receives the LBT failure indication and can trigger resource re-allocation. This closed-loop feedback system enables accurate detection and response to persistent LBT failures, resolving the contradiction between maintaining communication reliability through LBT and achieving precise failure detection.
2Measurement precision
If statistical number threshold is set for detecting persistent LBT failures, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by setting a statistical number threshold that triggers failure detection only when a specific number of LBT failures occur within a time window. This approach achieves sufficient detection accuracy for persistent failures without implementing continuous monitoring and complex analysis for every individual failure event, thus balancing detection precision with device complexity.
3Productivity
If resource re-allocation is performed upon detecting persistent LBT failure, then communication efficiency is enhanced, but loss of time occurs during resource switching
Solution Approach 1:
The patent implements preliminary action by having the network device pre-configure multiple transmission resources for the terminal. When a persistent LBT failure is detected, the network device can quickly re-allocate an alternative pre-configured resource without requiring extensive negotiation or setup time. This preparation in advance reduces the time loss during resource switching while maintaining communication efficiency.
Data Source
AI summary
A method for determining a persistent listen-before-talk (LBT) failure is applied to a terminal, and includes: determining a first transmission resource, wherein the first transmission resource includes a subset of resources used by the terminal for a sidelink transmission on an unlicensed frequency; and in response to determining that a number of failures of the terminal performing LBT using the first transmission resource satisfies a preset condition, determining that a persistent LBT failure occurs in the first transmission resource.