Sidelink Transmission HARQ Feedback Mode Matching
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Solution Overview
Problem
In 5G V2X communication systems, there is a challenge in determining the reception status of sidelink data, which is essential for deciding whether to retransmit data in case of a transmission failure.
Innovation Solution
The proposed solution involves determining a target resource and target data in the sidelink transmission system, where the HARQ feedback mode of the target data matches the target resource. This allows the terminal device to accurately determine the reception status of the sidelink data based on different HARQ feedback modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink data transmission is performed without HARQ feedback mechanism, then transmission delay is reduced and spectrum efficiency is improved, but transmission reliability deteriorates due to inability to determine reception status for retransmission
Solution Approach 1:
The patent introduces a HARQ feedback mechanism where the receiving terminal sends feedback information (ACK/NACK) to the sending terminal to indicate data reception status. This feedback enables the sending terminal to determine whether retransmission is needed, thereby improving transmission reliability while managing feedback complexity through standardized procedures.
2Adaptability or versatility
If a unified HARQ feedback mode is used for all sidelink resources, then device complexity is reduced, but adaptability deteriorates due to inability to optimize feedback for different transmission scenarios
Solution Approach 1:
The patent enables dynamic selection of HARQ feedback modes (e.g., ACK-only, NACK-only, ACK/NACK) based on different sidelink resource configurations and transmission scenarios. The network can configure different feedback modes for different resource pools or transmission types, allowing the system to adapt to varying reliability requirements and channel conditions while managing complexity through network-controlled configuration.
Data Source
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AI summary
Disclosed is a method for transmitting sidelink data. The method comprises: a terminal device determining a target resource and target data from among at least one sidelink transmission resource and at least one piece of data, wherein an HARQ feedback mode of the target data matches the target resource; and the terminal device sending, on the target resource, the target data. By means of the method, a terminal device can determine the reception of sidelink data on the basis of different HARQ feedback modes, thereby improving the flexibility of sidelink feedback.