Dynamic HARQ Feedback Modes for Flexible V2X Transmission
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Solution Overview
Problem
Existing HARQ feedback methods in V2X communication are inflexible, lacking the ability to dynamically configure feedback manners, which affects transmission efficiency and reliability.
Innovation Solution
A hybrid automatic repeat request (HARQ) feedback information transmission method that allows flexible configuration of feedback manners based on correspondence and transmission resources, enabling dynamic adjustment of HARQ feedback types through terminal devices and network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed HARQ feedback manner is used in V2X communication, then the system complexity is reduced and ease of operation is improved, but the adaptability to different transmission scenarios deteriorates and transmission efficiency is reduced
Solution Approach 1:
The patent implements dynamic HARQ feedback configuration by introducing a feedback manner indicator that can be dynamically set to different values (first feedback manner, second feedback manner, or third feedback manner). This allows the system to adapt the HARQ feedback behavior according to different transmission scenarios, services, or channel conditions, resolving the contradiction between operational simplicity and adaptability.
Solution Approach 2:
The patent changes the parameter of feedback manner type from a fixed value to a dynamically configurable parameter. By introducing the feedback manner indicator and allowing it to take different values, the system can adjust the HARQ feedback behavior (e.g., whether to send ACK/NACK, which resources to use) based on current transmission requirements, thereby improving adaptability while maintaining ease of operation through standardized configuration mechanisms.
2Reliability
If HARQ feedback is always transmitted in V2X communication, then transmission reliability is improved, but resource consumption increases and transmission efficiency deteriorates
Solution Approach 1:
The patent implements partial HARQ feedback by introducing a feedback manner indicator that can select among different feedback strategies. The first feedback manner enables full ACK/NACK feedback for high reliability, while the third feedback manner enables NACK-only feedback for resource efficiency. This partial feedback approach maintains reliability when needed while reducing resource consumption in scenarios where full feedback is excessive, thereby resolving the contradiction between reliability and transmission efficiency.
3Adaptability or versatility
If multiple HARQ feedback manners are supported, then adaptability is improved, but device complexity and system complexity increase
Solution Approach 1:
The patent achieves multi-functionality by designing a universal feedback mechanism that can operate in multiple modes through a single feedback manner indicator. The same terminal device and network device can support multiple HARQ feedback manners (first, second, and third feedback manners) by interpreting the feedback manner indicator differently, without requiring separate dedicated mechanisms for each feedback type. This universal design provides adaptability while controlling device complexity through standardized multi-functional components.
Data Source
AI summary
This application provides a hybrid automatic repeat request HARQ feedback information transmission method and an apparatus, to flexibly determine a feedback manner type. The method includes: A first terminal device obtains a transmission resource, determines, based on a first correspondence, a feedback manner type corresponding to a current transmission, performs data packet assembly processing based on the feedback manner type, and sends the data packet by using the transmission resource.