Sidelink Feedback Channel Configuration for Multi-Bit PSFCH
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Solution Overview
Problem
The current NR-V2X system only supports a single PSFCH format that can carry only one bit of SL feedback information, which is insufficient for meeting the higher requirements of throughput, latency, reliability, and flexibility in sidelink data transmission, especially in unlicensed spectra.
Innovation Solution
Introduce a first-type and second-type SL feedback channel configuration, where the first-type PSFCH occupies multiple time-domain and frequency-domain resources, and the second-type PSFCH uses a specific sequence, allowing for enhanced feedback information transmission, including HARQ-ACK, CQI, RI, PMI, beam, and measurement information, while ensuring compliance with unlicensed spectrum regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single PSFCH format is used, then the system structure is simple, but the feedback information capacity is insufficient
Solution Approach 1:
The patent segments the PSFCH into multiple formats (first-type PSFCH and second-type PSFCH) with different capabilities. The first-type PSFCH supports multiple bits of feedback information while the second-type maintains simpler structure for single-bit feedback. This segmentation allows the system to achieve higher feedback capacity when needed while maintaining simplicity for basic operations.
Solution Approach 2:
The patent introduces dynamic configuration mechanisms where the network can flexibly configure which PSFCH format to use based on transmission needs. The resource pool configuration information dynamically indicates whether to use first-type or second-type PSFCH, allowing the system to adapt between high capacity and simple modes as required by different transmission scenarios.
2Adaptability or versatility
If multiple PSFCH formats are introduced, then the feedback information capacity increases, but the configuration complexity increases
Solution Approach 1:
The patent makes the resource pool configuration information universal by using the same configuration structure to indicate both transmission resources and feedback channel format selection. The configuration information universally handles both resource allocation and PSFCH format selection through unified indication fields, reducing the need for separate complex configuration mechanisms.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving terminal feeds back SL feedback information (including HARQ-ACK) through the configured PSFCH formats. This feedback loop allows the system to dynamically adjust and optimize the use of multiple PSFCH formats based on actual transmission performance and requirements.
3Reliability
If first-type PSFCH occupies multiple time-domain and frequency-domain resources, then the feedback reliability improves, but the spectral efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating the resource occupation characteristics of different PSFCH types. The first-type PSFCH occupies multiple time-domain and frequency-domain resources specifically when high reliability is needed, while the second-type PSFCH uses minimal resources for basic feedback. This localized application of extended resources only where necessary optimizes the balance between reliability and spectral efficiency.
Data Source
AI summary
A method for configuring a sidelink (SL) feedback resource is provided. The method includes the following. A first terminal device obtains resource pool configuration information, where the resource pool configuration information includes resource pool indication information of a transmission resource of a SL data channel and resource pool indication information of a transmission resource of a SL feedback channel. The SL data channel is for transmitting first SL data, and the SL feedback channel includes a first-type SL feedback channel and a second-type SL feedback channel.