Sidelink Feedback Transmission on Contiguous Resource Sets
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Solution Overview
Problem
In sidelink communication, the lack of support for transmitting physical sidelink feedback channel (PSFCH) information over non-contiguous resource block (RB) sets leads to unpredictable behavior and potential transmission failures due to LBT failures in some RB sets.
Innovation Solution
The proposed solution involves determining a group of contiguous resource sets mapped with a subset of feedback transmission occasions for sidelink transmissions and prioritizing the transmission of feedback information on these contiguous resource sets, thereby avoiding non-contiguous RB sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If feedback information is transmitted on non-contiguous resource block sets, then more feedback transmission occasions are available, but transmission reliability deteriorates due to LBT failures in some RB sets
Solution Approach 1:
The feedback transmission resources are segmented into multiple resource block sets, where a first RB set is allocated for first feedback information and a second RB set is allocated for second feedback information. This segmentation allows the system to distribute feedback transmissions across different resource sets, improving adaptability while managing reliability through selective transmission based on LBT outcomes.
Solution Approach 2:
Different quality requirements are applied to different feedback information types. First feedback information (e.g., HARQ-ACK) is transmitted with higher priority on the first RB set, while second feedback information (e.g., CSI) is transmitted on the second RB set. This local quality differentiation ensures critical feedback maintains reliability while less critical feedback utilizes additional occasions.
2Reliability
If feedback information is transmitted on contiguous resource block sets, then transmission reliability improves, but the number of available feedback transmission occasions decreases
Solution Approach 1:
The system dynamically selects which resource block set to use for feedback transmission based on LBT outcomes and feedback priority. The first RB set is used for high-priority feedback when LBT succeeds, while the second RB set provides alternative transmission opportunities. This dynamic adaptation maintains reliability for critical feedback while providing versatility through multiple transmission paths.
Solution Approach 2:
The resource block sets act as intermediaries between the feedback information and the physical channel. Multiple RB sets provide intermediate transmission opportunities, allowing the system to mediate between reliability requirements and transmission occasion availability by selecting appropriate RB sets based on channel conditions and feedback priority.
3Adaptability or versatility
If multiple resource block sets are used for feedback transmission, then feedback transmission flexibility increases, but system complexity increases due to resource mapping and LBT management
Solution Approach 1:
The feedback transmission system is segmented into distinct resource block sets with specific functions. The first RB set is dedicated to high-priority feedback while the second RB set handles other feedback types. This segmentation simplifies management by creating clear boundaries and roles for each resource set, reducing the complexity of coordinating multiple transmission opportunities.
Solution Approach 2:
The system changes parameters such as RB set selection, feedback priority levels, and LBT configuration to achieve flexibility. By adjusting these parameters based on channel conditions and traffic requirements, the system maintains flexibility without requiring complex reconfiguration of the entire feedback mechanism.
Data Source
AI summary
Example embodiments of the present disclosure relate to a solution of transmitting sidelink (SL) feedback information on non-contiguous resource sets. In this solution, in accordance with a determination that a plurality of feedback transmission occasions for sidelink transmissions are mapped on non-contiguous resource sets, an apparatus determines a group of contiguous resource sets mapped with a subset of the plurality of feedback transmission occasions; and transmits feedback information on the group of contiguous resource sets.