V2X Transmission Reliability via Configurable Retransmission Resources
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Solution Overview
Problem
Current LTE-based V2X direct communication systems face challenges in achieving high data transmission reliability, particularly in scenarios requiring 99.999% accuracy, such as automatic driving control and road emergency notifications, where the existing mechanism only achieves about 90% accuracy.
Innovation Solution
A method where a terminal device sends information about the transmission reliability requirement to a radio access network device, which configures the necessary transmission resources, including time-frequency resources, to ensure reliable data transmission by adjusting the number of transmission times based on the reliability requirement, link quality, and latency needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blind retransmission mechanism is used for data transmission on the PC5 interface, then the transmission process is simple and does not require HARQ mechanism, but the data transmission reliability is insufficient (only about 90% accuracy)
Solution Approach 1:
The patent changes the transmission parameter by introducing a configurable number of transmission times (initial transmission plus retransmissions) based on reliability requirements. The network device configures different transmission counts for different services, transforming the fixed blind retransmission into a flexible parameter-driven mechanism that achieves higher reliability (99.999%) while maintaining reasonable complexity through network-side control.
2Reliability
If the number of transmission times is increased to meet high reliability requirements (99.999% accuracy), then data transmission reliability improves, but resource consumption (time-frequency resources) increases
Solution Approach 1:
The patent applies local quality by differentiating transmission resource allocation based on service types and reliability requirements. Different services (e.g., safety-critical vs. non-critical) receive different numbers of transmission opportunities. The network device configures service-specific transmission counts, ensuring that only high-reliability services consume additional retransmission resources, thereby optimizing overall resource utilization while meeting critical reliability targets.
3Reliability
If multiple transmission times are configured for high reliability services, then transmission accuracy reaches 99.999%, but transmission latency increases
Solution Approach 1:
The patent introduces dynamic transmission timing where the number of retransmissions and their scheduling are adapted based on service requirements and channel conditions. The network device can dynamically adjust transmission parameters including the number of retransmissions, timing offsets, and resource allocation. This dynamic approach allows critical services to receive multiple transmissions with optimized timing, while less critical services use fewer transmissions, balancing reliability and latency requirements.
Data Source
AI summary
A data transmission method, comprising: a terminal device at a transmit end sends information about a transmission reliability requirement of to-be-transmitted data to a radio access network device through a wireless communications interface; and the terminal device at the transmit end obtains a transmission resource that is configured by the radio access network device and that is required for sending the to-be-transmitted data on the wireless direct communications interface, and sends the data to the terminal device at the receive end by using the transmission resource.