NR-V2X Sidelink Data Feedback and Retransmission Coordination
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Solution Overview
Problem
In NR-V2X systems, the method for retransmitting sidelink data after receiving a negative acknowledgement (NACK) is not clearly defined, leading to uncertainty about how the transmitting terminal should notify the network for retransmission resources or perform autonomous retransmission.
Innovation Solution
A method where the network device provides sidelink transmission resource indication information and first uplink transmission resource indication information to the terminal device, enabling the terminal to transmit sidelink data and feedback information on designated resources, allowing the network to manage retransmissions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transmitting terminal performs autonomous retransmission without network coordination, then retransmission speed is improved, but transmission reliability deteriorates due to lack of network management
Solution Approach 1:
The network device acts as an intermediary that coordinates retransmission resources. The transmitting terminal requests retransmission resources from the network device, which then allocates and notifies the terminal of the specific time-frequency resources for retransmission. This mediator approach ensures both timely retransmission and network-managed reliability.
2Reliability
If the network device manages retransmission resources, then transmission reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The network device pre-configures the transmitting terminal with a set of candidate retransmission resources before actual data transmission. When retransmission is needed, the terminal simply selects from these pre-configured resources or requests specific resources from the pre-configured set, rather than requiring real-time network allocation. This preliminary configuration reduces the complexity of real-time resource management while maintaining network control.
3Reliability
If dedicated uplink resources are allocated for feedback transmission, then feedback reliability is improved, but uplink resource overhead increases
Solution Approach 1:
The same uplink time-frequency resources are used for multiple purposes: initial uplink data transmission and feedback transmission. The network device notifies the terminal of these resources, and the terminal transmits both uplink data and feedback (ACK/NACK) on the same resources at different times or with different signaling formats. This multi-functional use of resources improves feedback reliability without proportionally increasing resource overhead.
Data Source
AI summary
Embodiments of the present application relate to a method, terminal device, and network device for transmitting sidelink data. The method includes that: a first terminal device receives sidelink transmission resource indication information and first uplink transmission resource indication information configured by a network device, where the sidelink transmission resource indication information is used for indicating a sidelink transmission resource, and the first uplink transmission resource indication information is used for indicating a first uplink transmission resource; the first terminal device transmits sidelink data to at least one second terminal device on the sidelink transmission resource; and the first terminal device transmits the first feedback information to the network device, where the first feedback information is used for indicating whether the sidelink data has been received correctly.