Sidelink Feedback Resource Configuration for Multi-Format PSFCH
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Solution Overview
Problem
The current NR-V2X system supports only one PSFCH format for SL feedback, which is inadequate for handling higher throughput, lower latency, and higher reliability requirements in sidelink data transmission, particularly in unlicensed spectrum scenarios.
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 flexible and reliable SL feedback information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only one PSFCH format is used for SL feedback, then the system structure is simple, but the feedback capacity and reliability are insufficient for higher throughput and lower latency requirements
Solution Approach 1:
The patent divides 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 and is used for high reliability scenarios, while the second-type PSFCH uses a specific sequence for simpler feedback needs. This segmentation allows the system to select appropriate feedback formats based on requirements, improving overall reliability without requiring all formats to support all functions.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the network device can dynamically indicate which PSFCH format should be used for feedback transmission. The resource pool configuration information includes indication information that dynamically specifies the feedback channel type based on current transmission needs, allowing flexible adaptation to varying throughput and latency requirements without fixed structural constraints.
2Productivity
If a single PSFCH format supports only one bit of feedback, then the channel structure is simple, but it cannot satisfy higher throughput requirements
Solution Approach 1:
The patent segments the feedback channel into different types: the first-type PSFCH can carry multiple bits of feedback information (enabling higher throughput), while the second-type PSFCH carries a specific sequence for simpler feedback scenarios. This segmentation allows the system to achieve high throughput when needed without requiring the entire feedback channel structure to be complex.
Solution Approach 2:
The patent makes the feedback channel structure universal by designing both PSFCH formats to work within the same resource pool configuration framework. The network device configures resource pool indication information that can accommodate both first-type and second-type PSFCH, allowing a single configuration system to serve multiple feedback needs and throughput requirements.
3Adaptability or versatility
If multiple PSFCH formats are introduced to meet varying feedback information sizes, then feedback capacity increases, but configuration and resource allocation become more complex
Solution Approach 1:
The patent creates a universal resource pool configuration framework that can accommodate multiple PSFCH formats. The resource pool configuration information includes indication information that universally specifies feedback channel types, allowing the same configuration mechanism to handle both first-type and second-type PSFCH. This universality enables the system to adapt to varying feedback information sizes while maintaining consistent configuration procedures.
Solution Approach 2:
The patent implements feedback mechanisms where the network device provides indication information about which PSFCH format should be used, and the terminal device responds accordingly. This feedback loop allows the system to adapt to different feedback information requirements dynamically, with the network guiding the terminal's behavior based on current transmission needs, thereby managing complexity through coordinated adaptation.
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.