Sidelink LBT Resource-Pool Reselection After Consistent Failures
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Solution Overview
Problem
Existing sidelink communication systems face challenges in managing consistent Listen Before Talk (LBT) failures in unlicensed bands, which affect the reliability and efficiency of wireless communication.
Innovation Solution
A wireless user equipment (UE) is configured to perform a listen before talk (LBT) operation in a sidelink unlicensed band, selecting resources based on a resource pool and verifying consistent LBT failure triggers, allowing it to switch to alternative resource blocks or pools when failures occur, and reporting LBT failures through MAC control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT procedure is performed in unlicensed band for sidelink communication, then channel access reliability is improved, but communication efficiency deteriorates due to consistent LBT failures
Solution Approach 1:
The resource pool is divided into multiple resource block (RB) sets, allowing the UE to perform LBT procedures independently on different RB sets. When LBT failure occurs on one RB set, the UE can switch to another RB set without affecting the entire resource pool, thus maintaining communication efficiency while ensuring reliable channel access through systematic resource segmentation.
Solution Approach 2:
The patent introduces a consistent LBT failure trigger status that changes based on LBT procedure outcomes. When consistent LBT failure is detected on all RB sets, the UE triggers a resource pool reselection process, changing the operational parameters from current resource pool to a newly selected one. This dynamic parameter change resolves the contradiction by adapting resource access strategies based on LBT success/failure patterns.
2Reliability
If resource pool reselection is performed upon consistent LBT failure, then communication reliability is improved, but time delay increases due to resource selection procedure
Solution Approach 1:
The UE performs resource selection and LBT procedures in advance on multiple RB sets within the resource pool before actual data transmission. By pre-establishing multiple candidate RB sets and their LBT statuses, the system reduces the time required for resource reselection when consistent LBT failure occurs, as the UE can quickly switch to a pre-evaluated alternative rather than performing a complete resource selection procedure.
Solution Approach 2:
The patent implements dynamic resource block set selection where the UE can switch between different RB sets based on real-time LBT outcomes. This dynamic approach allows the system to adapt resource allocation on-the-fly, minimizing time loss by selecting alternative RB sets without requiring full resource pool reselection, thus balancing reliability improvement with time efficiency.
Data Source
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AI summary
A wireless user equipment (UE) that performs a listen before talk (LBT) operation in a sidelink unlicensed band in a wireless communication system may be configured to select a resource pool and a resource for sidelink communication based on a resource pool and resource selection procedure, to perform an LBT procedure using the resource pool and the resource selected based on the sidelink unlicensed band, to verify a consistent LBT failure trigger status based on the LBT procedure, and to select the resource for the sidelink communication based on a transmission resource selection procedure when the consistent LBT failure is triggered.