Sidelink PSFCH Resource Selection for Reliable HARQ-ACK Feedback
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Solution Overview
Problem
The current standard lacks a method for selecting Physical Sidelink Feedback Channel (PSFCH) resources in Sidelink on Unlicensed Spectrum (SL-U) systems, which is essential for Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) information transmission.
Innovation Solution
A method and apparatus for selecting sidelink resources in SL-U systems, involving the acquisition and determination of PSFCH transmission resources based on configuration information, including RB set indication, PSFCH resource group numbers, and bitmap indications to facilitate HARQ-ACK information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSFCH resource selection method is not specified in current standard, then system complexity is reduced, but communication reliability deteriorates due to inability to transmit HARQ-ACK information
Solution Approach 1:
The patent applies preliminary action by pre-configuring PSFCH resource pools and establishing resource selection rules before actual communication occurs. The gNB configures multiple PSFCH resource pools with different parameters (frequency domain resources, time domain resources, association rules) in advance, and the terminal selects appropriate resources based on pre-defined criteria related to the transmitted PSSCH, thereby ensuring reliable HARQ-ACK transmission without complex real-time negotiations
Solution Approach 2:
The patent segments the PSFCH resources into multiple resource pools with different configurations. Each resource pool contains specific frequency domain resources (PRBs), time domain resources (slots), and association rules. This segmentation allows the system to provide diverse PSFCH resource options for different transmission scenarios, improving reliability while keeping each individual resource pool's configuration manageable and not overly complex
2Adaptability or versatility
If multiple PSFCH resource pools are configured with different parameters, then adaptability is improved, but device complexity increases due to resource selection and management
Solution Approach 1:
The patent utilizes parameter changes by configuring multiple PSFCH resource pools with varying parameters including frequency domain resource allocations (different PRB sets), time domain resource allocations (different slot offsets and periods), and association rules (different relationships between PSSCH and PSFCH). These parameter variations enable the system to adapt to different channel conditions, traffic patterns, and service requirements while maintaining a structured configuration framework that manages complexity through systematic parameter control
3Loss of information
If PSFCH resources are not properly determined, then system operation is simplified, but information transmission completeness deteriorates
Solution Approach 1:
The patent implements feedback mechanisms by establishing clear association rules that link PSFCH resources to their corresponding PSSCH transmissions. The gNB configures feedback resource indicators and association rules that enable the terminal to automatically determine the appropriate PSFCH resource based on the received PSSCH parameters (such as frequency domain resource assignment, time domain resource assignment). This feedback-based resource determination ensures complete HARQ-ACK information transmission while simplifying terminal operation through automated resource selection
Solution Approach 2:
The patent introduces configuration messages and resource indicators as intermediaries between the gNB and terminal for PSFCH resource determination. The gNB uses RRC configuration messages to provide PSFCH resource pool parameters and association rules, which act as intermediaries that translate complex resource allocation decisions into simple terminal-side selection procedures. This intermediary mechanism ensures accurate resource determination while keeping the terminal's operational complexity low
Data Source
Figure 1~2C
Figure 2D~4B
Figure 4C~5
AI summary
The present disclosure relates to the technical field of communications. Disclosed are a method and apparatus for selecting sidelink resources, and a terminal. The method, which is applied to a first terminal, includes: acquiring Physical Sidelink Feedback Channel (PSFCH) resource configuration information; and determining a PSFCH transmission resource, wherein the PSFCH transmission resource is configured for PSFCH transmission, and the PSFCH transmission carries Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) information related to Physical Sidelink Shared Channel (PSSCH) reception.