Sidelink Feedback Resource Overlap Handling in 5G NR
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Solution Overview
Problem
In 5G communication systems, particularly in New Radio (NR) systems, there is a challenge in efficiently transmitting HARQ-ACK feedback information over sidelink channels, where resources for feedback transmission may overlap, leading to conflicts and potential delays in retransmission decisions.
Innovation Solution
A method and apparatus where a terminal determines whether resources for transmitting feedback information for different sidelink data overlap, and prioritizes transmitting feedback corresponding to higher-priority information based on sidelink control scheduling, ensuring timely and accurate retransmission decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If feedback information for multiple sidelink data is transmitted on overlapping resources, then resource utilization is improved, but feedback transmission reliability deteriorates due to conflicts
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different feedback information based on their corresponding sidelink data priorities. When resources overlap, the system selectively transmits only high-priority feedback information while dropping low-priority feedback, thereby ensuring reliable transmission of critical feedback while utilizing available resources efficiently.
2Object-affected harmful factors
If feedback transmission timing is delayed to avoid resource overlap, then resource conflicts are reduced, but retransmission decision timeliness deteriorates
Solution Approach 1:
The patent determines priority information by copying or referencing the priority of the corresponding sidelink data (indicated by PPPP values in SCI). This allows the feedback transmission system to quickly determine which feedback to prioritize without complex calculations, enabling timely transmission decisions that avoid delays while resolving resource conflicts.
3Loss of information
If all feedback information is transmitted regardless of priority, then feedback completeness is improved, but resource waste increases due to transmitting low-priority feedback during conflicts
Solution Approach 1:
The patent implements a selective feedback transmission mechanism where low-priority feedback information is discarded when resource overlap is detected. The system recovers resources by not transmitting these low-priority feedbacks, allowing those resources to be reused or allocated to higher-priority transmissions, thereby reducing overall resource waste while maintaining essential feedback completeness.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system with a technology for Internet of Things (IoT). Methods and apparatuses are provided in which first sidelink data and second sidelink data are received from one or more terminals. It is determined whether a first resource for transmitting first feedback information for the first sidelink data and a second resource for transmitting second feedback information for the second sidelink data overlap each other. When the first resource and the second resource overlap each other, feedback information corresponding to one of the first feedback information and the second feedback information having a higher priority, is transmitted to the one or more terminals. A priority of each of the first feedback information and the second feedback information is based on sidelink control information scheduling each of the first sidelink data and the second sidelink data.