HARQ Feedback Resource Determination for V2X
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Solution Overview
Problem
In vehicle-to-everything (V2X) communications, determining a hybrid automatic repeat request (HARQ) feedback resource for a receive end is challenging, especially when the receive end is not within the coverage area of a base station, as existing methods rely on base station allocation or receive end determination, lacking a clear mechanism for the transmit end to configure the HARQ feedback resource.
Innovation Solution
The transmit end determines the HARQ feedback resource for the receive end based on processing capability information and data priority, using indication information to ensure timely and accurate HARQ information feedback, synchronizing the resource with the receive end's processing time and selecting from a resource pool corresponding to the processing capability level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the receive end determines the HARQ feedback resource autonomously or the base station allocates it, then the mechanism is simple, but the transmit end cannot configure the HARQ feedback resource when the receive end is out of base station coverage
Solution Approach 1:
The patent introduces indication information as an intermediary carrier to transmit HARQ feedback resource configuration from the transmit end to the receive end. This mediator enables the transmit end to configure resources without direct base station involvement, resolving the contradiction between adaptability and complexity by using a lightweight signaling mechanism.
Solution Approach 2:
The transmit end performs preliminary configuration of HARQ feedback resources by embedding indication information in advance within the data transmission process. This preliminary action allows the receive end to have the necessary resource information before needing to feedback, enabling autonomous operation outside base station coverage while maintaining a relatively simple mechanism.
2Reliability
If the HARQ feedback resource is determined without considering processing capability, then the configuration is simple, but the feedback timing may not align with the receive end's processing capability
Solution Approach 1:
The patent changes the parameter of resource selection by introducing processing capability information as a determining factor. The transmit end selects HARQ feedback resources based on the receive end's processing capability, ensuring that the feedback timing aligns with what the receive end can actually process. This parameter-based approach improves reliability while keeping the complexity manageable through standardized capability levels.
3Speed
If the HARQ feedback resource does not consider data priority, then the resource allocation is simple, but high priority data may experience delays
Solution Approach 1:
The patent applies local quality by differentiating resource allocation based on data priority levels. Different HARQ feedback resources are assigned according to the priority of the transmitted data, ensuring that high priority data receives dedicated resources with faster feedback timing. This localized differentiation improves feedback speed for critical data while maintaining a systematic approach that manages complexity through priority-based categorization.
Data Source
AI summary
A method for determining a hybrid automatic repeat request (HARQ) feedback resource includes determining, by a transmit end, the HARQ feedback resource of a receive end based on processing capability information of the receive end of a priority of data transmitted between the transmit end and the receive end, where the HARQ feedback resource carries HARQ information corresponding to the data transmitted between the transmit end and the receive end, and sending, by transmit end to the receive end, indication information indicating the HARQ feedback resource.