Sidelink Feedback Control for NR-V2X Multicast
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Solution Overview
Problem
In the New Radio (NR)-based Vehicle to Everything (V2X) system, the high feedback overhead in multicast communication poses a challenge, as all group members sending feedback information to the group header results in increased overhead, which is inefficient and affects data transmission reliability.
Innovation Solution
A method where a terminal device determines whether to send feedback information based on indication information, reducing unnecessary feedback by assessing the transmission reliability of the sidelink channel, thereby optimizing feedback transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all group members send feedback information to the group header in multicast communication, then data transmission reliability is improved, but feedback overhead increases
Solution Approach 1:
The patent applies partial action by having only selected group members send feedback information rather than all members. The terminal determines whether to send feedback based on comparing channel quality against a threshold, thereby reducing overall feedback quantity while maintaining sufficient reliability for data transmission.
Solution Approach 2:
The patent implements local quality by allowing different group members to have different feedback behaviors based on their individual channel conditions. Terminals with poor channel quality send feedback while those with good quality do not, creating localized feedback decisions optimized for each terminal's specific situation.
2Reliability
If feedback information is sent by all group members, then transmission reliability is enhanced, but system efficiency decreases due to high overhead
Solution Approach 1:
The system achieves sufficient reliability through partial feedback from selected terminals rather than all terminals. By using channel quality thresholds to determine feedback necessity, the system maintains transmission reliability while improving overall efficiency through reduced feedback overhead.
Solution Approach 2:
The patent changes the parameter of feedback transmission from a binary all-or-nothing approach to a conditional approach based on channel quality parameters. Terminals dynamically adjust their feedback behavior according to measured channel conditions, optimizing the balance between reliability and efficiency.
Data Source
AI summary
A method for transmitting feedback information includes obtaining, by a first terminal, first indication information, wherein the first indication information is used for indicating whether the first terminal needs to send feedback information; receiving, by the first terminal, a first sidelink channel sent by a second terminal; and determining, by the first terminal, whether to send the feedback information for the first sidelink channel to the second terminal according to the first indication information.