Sidelink Retransmission Control Under ACK Detection Errors
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Solution Overview
Problem
Network device detection errors during sidelink data transmission in V2X systems lead to inefficient resource allocation and increased congestion, as the network may erroneously detect acknowledgement signals, causing unnecessary retransmissions.
Innovation Solution
The terminal device is equipped with modules to handle network detection errors by determining whether to retransmit data or not based on acknowledgement information, and to autonomously acquire resources when network scheduling is absent, thereby optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device performs detection of acknowledgement information during sidelink data transmission, then transmission reliability can be monitored, but detection errors occur causing unnecessary retransmissions and resource waste
Solution Approach 1:
The patent implements a feedback mechanism where the terminal device sends acknowledgement information to the network device, and the network device detects this feedback to determine whether retransmission is needed. However, detection errors can occur in this feedback loop, leading to incorrect retransmission decisions and resource waste.
Solution Approach 2:
The terminal device is empowered to autonomously determine whether retransmission is needed by detecting the network device's detection status, rather than blindly following network device retransmission requests. This self-service capability allows the terminal to correct network device detection errors and avoid unnecessary retransmissions.
2Reliability
If the terminal device retransmits data based on network device scheduling, then transmission reliability is improved, but resource allocation efficiency decreases due to detection errors
Solution Approach 1:
The terminal device performs preliminary detection of the network device's detection status before executing retransmission. This preliminary action allows the terminal to anticipate and prevent unnecessary retransmissions caused by network device detection errors, thereby improving resource allocation efficiency while maintaining reliability.
Solution Approach 2:
Instead of the network device unconditionally scheduling retransmission based on its detection, the patent inverts the logic by having the terminal device detect the network's detection status and make the final retransmission decision. This inversion corrects detection errors and improves resource allocation efficiency.
3Productivity
If the terminal device autonomously acquires resources when network scheduling is absent, then resource utilization improves, but resource conflicts may increase
Solution Approach 1:
The patent implements a dynamic resource acquisition mechanism where the terminal device adapts its resource selection based on network conditions. When network scheduling is absent, the terminal autonomously acquires resources according to preset rules, but can switch to network-scheduled resources when available, thereby balancing resource utilization with conflict avoidance.
Data Source
AI summary
The present application relates to a sidelink data transmission method and a terminal device. The sidelink data transmission method comprises: a terminal device sends, to a network device, acknowledgement information for first sidelink data; the terminal device receives first information, the first information being used for indicating the terminal device to retransmit the first sidelink data; and the terminal device retransmits the first sidelink data or does not retransmit the first sidelink data. By using the embodiments of the present application, the reasonable utilization of a resource can be realized to a certain extent.