Sidelink Resource Window Selection After Consistent LBT Failure
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Solution Overview
Problem
The utilization of communication resources for sidelink transmission in SL-U communication is low due to consistent LBT failures, leading to inefficiencies in resource usage.
Innovation Solution
A mechanism is introduced to set a duration and determine a resource set from the resource selection window based on the time of consistent LBT failure, excluding resources within this duration to avoid inappropriate resource selection and improve resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resource exclusion mechanism is introduced to avoid conflicts between transmission resources, then resource selection reliability is improved, but resource utilization deteriorates because resources with LBT failures are completely excluded from future use
Solution Approach 1:
The patent changes the parameter of resource availability by introducing a duration parameter. Instead of permanently excluding resources with LBT failures, the system excludes them only for a limited duration, after which they become available again. This transforms the binary state (available/unavailable) into a time-dependent state, resolving the contradiction between reliability and utilization.
Solution Approach 2:
The patent creates a virtual copy of the resource exclusion mechanism by maintaining a separate duration counter independent of the actual resource status. This allows the system to track exclusion status separately from resource availability, enabling resources to be reused after the duration expires while still maintaining the exclusion mechanism for conflict avoidance.
2Reliability
If resources with consistent LBT failure are permanently excluded from use, then transmission reliability is improved, but communication efficiency deteriorates due to resource waste
Solution Approach 1:
The patent introduces a duration parameter that transforms permanent exclusion into temporary exclusion. Resources are excluded for a specific duration after LBT failure, then automatically become available again. This parameter change maintains transmission reliability during the exclusion period while improving communication efficiency by enabling resource reuse afterward.
Solution Approach 2:
The patent implements periodic resource availability by cycling resources through exclusion and availability states. After a LBT failure, resources enter an exclusion period, then automatically transition back to available status. This periodic action ensures reliable transmission during exclusion while maintaining overall system efficiency through resource recycling.
3Reliability
If all resources in the resource selection window are excluded after LBT failure, then resource conflict avoidance is improved, but resource selection flexibility deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the exclusion status of individual resources based on their LBT failure history. Instead of uniformly excluding all resources, the system selectively excludes only those specific resources that experienced LBT failures, while leaving other resources available. This localized approach maintains conflict avoidance for problematic resources while preserving flexibility for resource selection.
Solution Approach 2:
The patent introduces dynamic resource exclusion status that changes over time. Resources transition from available to excluded and back to available based on LBT failure events and duration expiration. This dynamic behavior allows the system to adapt resource availability in real-time, maintaining conflict avoidance when needed while preserving selection flexibility when resources become available again.
Data Source
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AI summary
This application provides a communication method and a communication apparatus. The method includes: determining, at a first time, that listen before talk (listen before talk, LBT) on a first resource meets a consistent LBT failure; determining a first duration; and determining a first resource set from a resource selection window based on the first time and the first duration, where a resource in the first resource set is used for sidelink communication. Specifically, the first duration is set and the first resource set is selected from the resource selection window based on the first time, so that a resource that is in the first resource and that corresponds to the first duration is excluded from the resource selection window, and selection of an inappropriate communication resource is avoided. In addition, in the foregoing solution, a time range within which the first resource cannot be used is defined, so that a case in which the first resource for which the consistent LBT failure is triggered cannot continue to be used by a terminal device ever can be avoided.