PSFCH Feedback Resource Determination for V2X Sidelink Reliability
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Solution Overview
Problem
The existing 3GPP protocol lacks standardization for the time-frequency resource of the Physical Sidelink Feedback Channel (PSFCH), affecting the reliable transmission of sidelink feedback control information in V2X communication systems.
Innovation Solution
A method and apparatus that determine a feedback resource based on the transmission resource of sidelink data, allowing for the efficient transmission of sidelink feedback control information using PSFCH, including repeating feedback information to improve reliability when the feedback resource is greater than required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the feedback resource is greater than the resource required for sending feedback information, then reliability of feedback transmission is improved through repeated transmission, but resource waste occurs
Solution Approach 1:
The patent applies partial action by transmitting feedback information only the necessary number of times to achieve reliable transmission. The terminal determines the exact number of repetitions needed based on the difference between available feedback resources and minimum required resources, avoiding unnecessary repeated transmissions that would waste resources while ensuring sufficient reliability.
2Adaptability or versatility
If the existing 3GPP protocol does not uniformly standardize time-frequency resource of PSFCH, then flexibility in resource allocation is maintained, but sending of PSFCH is affected and reliability is reduced
Solution Approach 1:
The patent changes the parameter of feedback resource allocation from non-standardized to standardized by establishing uniform rules for determining PSFCH time-frequency resources. The terminal determines feedback resources based on standardized relationships with uplink data resources, which improves reliability while maintaining adaptability through configurable parameters like resource offsets and repetition counts.
3Reliability
If feedback information is repeated transmission to improve reliability, then transmission reliability is enhanced, but transmission time increases
Solution Approach 1:
The patent applies partial action by performing feedback information repetition only to the extent necessary to fill the available feedback resources efficiently. The terminal calculates the optimal number of repetitions based on resource availability, achieving reliable transmission without unnecessary time consumption from excessive repetitions.
Data Source
AI summary
A PSFCH sending method and an apparatus are provided, and relate to V2X, an intelligent vehicle, autonomous driving, an intelligent connected vehicle, and the like. The method may include: a first terminal apparatus receives first sidelink data from a second terminal apparatus, and determines, based on a transmission resource of the first sidelink data, a feedback resource used to send SFCI. The transmission resource of the first sidelink data and the feedback resource include N resource elements, and N is a positive integer. When X resource elements are required for sending first feedback information, and X is less than N, the first terminal apparatus sends at least one piece of SFCI to the second terminal apparatus on the feedback resource through at least one PSFCH. The SFCI includes the first feedback information, and the first feedback information indicates whether the first terminal apparatus correctly receives the first sidelink data.