NR V2X Multicast Feedback Switching for Congested Resources
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Solution Overview
Problem
The existing NR V2X multicast feedback mechanisms in wireless communication systems face inefficiencies due to unchanged feedback manners that fail to adapt to dynamically changing channel conditions and varying numbers of terminals, leading to reduced system efficiency and resource utilization.
Innovation Solution
A multicast feedback configuration method that dynamically adjusts the feedback manner based on resource congestion control information and the number of terminals, allowing terminals to share resources when congestion is high or use dedicated resources when conditions allow, ensuring reliable data transmission and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all second terminals share one common feedback resource (NACK-only feedback manner), then resource utilization is improved, but the first terminal cannot distinguish between DTX feedback state and ACK feedback state, reducing data transmission reliability
Solution Approach 1:
The patent applies dynamics by making the feedback manner configurable and switchable between NACK-only mode and ACK/NACK mode based on channel conditions and terminal quantity. The first terminal can dynamically select which feedback manner to use, allowing the system to adapt between resource efficiency and reliability requirements depending on the operational context.
2Reliability
If each second terminal has a dedicated resource for feeding back ACK/NACK, then the first terminal can recognize the DTX state, but when there are a large quantity of second terminals, resource waste occurs due to configuring dedicated resources for each terminal
Solution Approach 1:
The patent applies local quality by allowing different feedback manners to be applied to different groups of second terminals based on their characteristics and channel conditions. The first terminal can configure specific terminals to use ACK/NACK feedback while others use NACK-only feedback, optimizing resource usage while maintaining reliability where needed.
Solution Approach 2:
The patent changes the feedback manner parameter dynamically based on the quantity of second terminals and channel conditions. When terminal quantity is small, ACK/NACK mode is used for reliability; when terminal quantity is large, NACK-only mode is used to save resources. This parameter adjustment resolves the contradiction between reliability and resource efficiency.
3Device complexity
If the feedback manner remains unchanged in NR V2X multicast process, then configuration simplicity is maintained, but system operating efficiency and resource utilization are reduced when quantity of second terminals and channel status continuously change
Solution Approach 1:
The patent makes the feedback manner dynamic and configurable rather than fixed. The first terminal can adjust the feedback manner based on changing channel conditions and terminal quantities, allowing the system to optimize performance in real-time while maintaining manageable configuration complexity through centralized control.
Data Source
AI summary
This application relates to the field of communication technologies, especially to V2X, intelligent driving, intelligent and connected vehicles, and the like. The method includes: sending, by a first terminal, first information to a second terminal, where the first information includes information indicating a feedback manner of first data, the first data is a data packet sent by the first terminal to the second terminal, the feedback manner is a first feedback manner or a second feedback manner, the first feedback manner is that the second terminal feeds back, to the first terminal, only acknowledgement information indicating that the data packet fails to be received, and the second feedback manner is that the second terminal feeds back, to the first terminal, acknowledgement information indicating that the data packet is successfully received or fails to be received. The method is applied to a multicast transmission process.