V2X Direct Link Feedback Mechanism for High-Density Reliability
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Solution Overview
Problem
Current direct communication methods in V2X services, such as vehicle platooning, face reliability issues due to broadcast transmission and limited retransmissions, leading to increased transmission collisions and decreased reliability in high-density service scenarios, which cannot satisfy the high reliability requirements of V2X services like vehicle platooning.
Innovation Solution
An information feedback method where direct communication data carries feedback indication information, allowing the receiving end to send feedback on a dedicated direct link feedback resource, improving transmission reliability by enabling targeted data transmission and flexible resource scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If broadcast transmission is used for V2X communication, then coverage and reachability are improved, but transmission reliability deteriorates due to increased collision probability in high-density scenarios
Solution Approach 1:
The patent segments the communication approach by introducing feedback-based targeted transmission. Instead of pure broadcast, the system divides transmission into broadcast phases and targeted retransmission phases based on feedback received, allowing selective retransmission to specific vehicles that missed the initial broadcast, thereby improving reliability without sacrificing coverage
Solution Approach 2:
The patent implements a feedback mechanism where receiving vehicles send acknowledgment signals to transmitting vehicles. This feedback enables the transmitting vehicle to determine whether retransmission is necessary and to which specific vehicle(s), transforming the unreliable broadcast into a reliable targeted transmission when needed, thus resolving the contradiction between broadcast coverage and transmission reliability
2Reliability
If feedback mechanism is introduced for targeted retransmission, then transmission reliability is improved, but system complexity increases due to additional signaling and resource management
Solution Approach 1:
The patent applies self-service by enabling vehicles to autonomously determine their own transmission needs based on received feedback. Each vehicle independently processes feedback signals and decides whether to perform targeted retransmission, reducing the need for complex centralized control and resource management, thereby improving reliability while limiting the increase in system complexity
3Productivity
If retransmission opportunities are limited, then resource efficiency is improved, but transmission reliability deteriorates in high-density service scenarios
Solution Approach 1:
The patent introduces dynamic adaptability by allowing the number of retransmission opportunities to be flexibly configured based on service requirements and channel conditions. The system can dynamically adjust between limited retransmissions for normal scenarios and increased retransmissions for high-density scenarios, thereby maintaining resource efficiency while improving reliability when needed
Data Source
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AI summary
Embodiments of this application provide an information feedback method and an apparatus, and relate to the communications field. The method includes: obtaining, by a transmitting end, a direct link transmission resource; sending, by the transmitting end, first direct communication data to a receiving end by using the direct link transmission resource, where the first direct communication data carries feedback indication information and sending manner indication information, the feedback indication information is used to indicate whether a receiving feedback needs to be performed for the first direct communication data, and the sending manner indication information is used to indicate that a manner of sending the first direct communication data is at least one of unicast, multicast, or broadcast; and when the feedback indication information indicates that a feedback needs to be performed for the first direct communication data, receiving, by the transmitting end, second direct communication data sent by the receiving end on a direct link feedback resource, where the second direct communication data carries feedback information. This application can improve direct link transmission reliability, and enables resource scheduling to be more flexible.