Sidelink HARQ Feedback Resource Selection Across Channel Occupancy Time
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request (HARQ) feedback during and outside channel occupancy time (COT), particularly in New Radio (NR) networks, which can impact communication efficiency and reliability.
Innovation Solution
The proposed solution involves determining whether a physical sidelink feedback channel (PSFCH) transmission is scheduled during or outside a COT, and adjusting the transmission and monitoring of HARQ feedback accordingly using specific resource sets and timelines based on this determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback is transmitted using a unified resource set regardless of COT timing, then device complexity is reduced, but communication efficiency deteriorates due to suboptimal resource utilization
Solution Approach 1:
The patent segments the HARQ feedback resource set into two distinct subsets: one for feedback transmitted during COT and another for feedback transmitted outside COT. This segmentation allows optimized resource allocation for each timing scenario, improving overall communication efficiency by matching resource characteristics to transmission timing requirements.
Solution Approach 2:
The patent implements dynamic selection of resource subsets based on the timing of feedback transmission relative to COT. The UE determines whether to use the first or second resource subset dynamically, depending on whether the feedback is transmitted during or outside the COT period, allowing adaptive optimization of resource utilization.
2Reliability
If HARQ feedback timing is standardized without COT consideration, then protocol simplicity is maintained, but feedback reliability deteriorates due to timing conflicts
Solution Approach 1:
The patent segments the HARQ timelines into multiple subsets, each associated with specific resource sets for different COT timing scenarios. This segmentation enables the system to select appropriate timelines that avoid conflicts with COT boundaries, thereby improving feedback reliability.
Solution Approach 2:
The patent establishes predetermined associations between resource sets and timeline subsets before actual feedback transmission. By pre-configuring which timelines correspond to which resource subsets based on COT timing, the system eliminates the need for complex real-time timeline management while ensuring reliable feedback transmission.
3Productivity
If resource allocation does not differentiate between COT and non-COT feedback, then resource management complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies local quality by assigning different resource characteristics to different COT timing scenarios. The first resource subset is optimized for during-COT feedback transmission, while the second resource subset is optimized for outside-COT feedback transmission. This localized optimization improves spectral efficiency by matching resource properties to transmission timing requirements.
Solution Approach 2:
The patent changes resource allocation parameters based on COT timing. By switching between different resource subsets with different configured parameters (such as time-frequency resources, periodicity, and offsets), the system optimizes spectral efficiency for each feedback transmission scenario without requiring complex real-time resource management.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether a physical sidelink feedback channel (PSFCH) transmission is scheduled during a channel occupancy time (COT). Accordingly, the UE may transmit the PSFCH transmission using a first set of resources based at least in part on determining that the PSFCH transmission is scheduled outside the COT. Alternatively, the UE may transmit the PSFCH transmission using a second set of resources based at least in part on determining that the PSFCH transmission is scheduled in the COT. Numerous other aspects are described.