Sidelink-Unlicensed Resource Alignment to Prevent Inter-UE Blocking
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Solution Overview
Problem
Existing sidelink-unlicensed (SL-U) communication systems face issues with inter-UE blocking, leading to reduced bandwidth utilization and prevention of high-priority UEs from accessing shared channels due to LBT failures and resource scarcity, particularly in Mode-2 communication scenarios.
Innovation Solution
The proposed techniques involve a transmitter UE (Tx UE) selecting resources within a resource selection window to allow higher-priority UEs to access the shared channel by aligning resource selections, conducting last-minute LBT evaluations, and adjusting transmission start points or initiating COT sharing to avoid interfering with other UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a transmitter UE selects resources within a resource selection window for sidelink communication, then the UE can establish communication with the receiver UE, but other higher-priority UEs may be blocked from accessing the shared channel due to LBT failures and resource scarcity
Solution Approach 1:
The transmitter UE performs a last-minute LBT evaluation before the initiating transmission within the resource selection window. This preliminary action allows the UE to detect new high-priority reservations that were previously not detected during the selection process, and adjust the starting point of transmission accordingly, preventing blocking of higher-priority UEs
Solution Approach 2:
The resource selection process is made dynamic by allowing the transmitter UE to adjust its transmission parameters (starting point alignment, COT sharing) based on real-time detection of other UEs' reservations. This dynamic adaptation resolves the contradiction between establishing communication and preventing blocking of high-priority UEs
2Productivity
If the transmitter UE conducts resource selection and transmission in the shared channel, then communication can be established, but inter-UE blocking occurs leading to reduced bandwidth utilization
Solution Approach 1:
The transmitter UE performs re-evaluation during the COT to detect new high-priority reservations by other UEs. This feedback mechanism allows the system to adapt to changing conditions and prevent inter-UE blocking, thereby improving bandwidth utilization while maintaining communication productivity
Solution Approach 2:
The transmitter UE modifies transmission parameters (abandoning COT slots, initiating COT sharing) based on detected reservations. These parameter changes allow the system to optimize bandwidth utilization by preventing blocking of high-priority UEs while maintaining effective communication transmission
3Loss of energy
If the transmitter UE aligns resource selections with other reserving UEs to allow higher-priority access, then bandwidth utilization is enhanced, but the complexity of resource management increases
Solution Approach 1:
The transmitter UE autonomously performs resource selection, LBT evaluation, and transmission adjustment without external intervention. This self-service approach handles the increased complexity of resource management internally, allowing the UE to align resources with other UEs and enhance bandwidth utilization independently
Data Source
AI summary
Aspects of the present disclosure are directed to techniques to ensure that other UEs that may have reserved resources within the same resource selection window are allowed (or at least not prevented) from gaining access to the shared channel during their respective reserved resource period for both Out-of-COT and in-COT preemption window period.