Sidelink HARQ-ACK Feedback via K1 Timing to Reduce Overhead
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Solution Overview
Problem
The determination of physical sidelink feedback information based on PSFCH RBs and time interval Y2 results in excessively high overheads and complexity in sidelink HARQ-ACK feedback.
Innovation Solution
Determine target sidelink feedback information based on a target sidelink channel transmission resource associated with a target uplink channel, using a first time interval between these channels to reduce overheads and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical sidelink feedback information is determined according to multiple PSFCH RBs and time interval Y2, then feedback coverage is improved, but overhead and system complexity increase excessively
Solution Approach 1:
The patent extracts the essential timing relationship (K1) between sidelink channel and uplink channel, separating it from the complex PSFCH resource selection process. By determining feedback information based solely on the K1 time interval rather than searching through multiple PSFCH RBs, the solution reduces overhead while maintaining feedback coverage.
Solution Approach 2:
The patent changes the determining parameter from multiple PSFCH RB indices and Y2 time intervals to a single K1 time interval parameter. This parameter simplification reduces the dimensionality of the resource determination process, directly lowering system complexity and overhead while preserving the ability to provide feedback for multiple sidelink transmissions.
2Loss of information
If physical sidelink feedback information is determined according to multiple PSFCH RBs and time interval Y2, then feedback information completeness is improved, but coding complexity increases excessively
Solution Approach 1:
The patent segments the feedback determination process into two independent parts: (1) determining the K1 time interval between sidelink and uplink channels, and (2) using this K1 value to index into the feedback information table. This segmentation simplifies the coding process compared to jointly determining feedback from multiple PSFCH RBs and Y2 intervals.
Solution Approach 2:
Instead of determining feedback information by selecting from multiple PSFCH RBs (forward approach), the patent inverts the approach by using the K1 time interval to directly retrieve pre-configured feedback information. This inversion simplifies the coding complexity while maintaining information completeness.
3Reliability
If multiple PSFCH RBs are used for feedback transmission, then feedback reliability is improved, but resource overhead increases excessively
Solution Approach 1:
The patent makes the K1 time interval parameter serve multiple functions: it determines both the timing relationship between channels and the index for retrieving feedback information. This multi-functionality eliminates the need for separate PSFCH RB selection, reducing resource overhead while maintaining feedback reliability through the same timing-based mechanism.
Data Source
AI summary
A physical sidelink feedback information determining method and a communication device are provided. The method includes: determining target physical sidelink feedback information according to a target sidelink channel transmission resource associated with a target uplink channel, where the target sidelink channel transmission resource is determined according to a first time interval, and the first time interval is a time interval between the target sidelink channel transmission resource and the target uplink channel.