Sidelink Data Transmission with Flexible HARQ Feedback
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Solution Overview
Problem
The existing LTE and NR sidelink systems suffer from low data transmission quality and efficiency due to the lack of a flexible Hybrid Automatic Repeat Request (HARQ) feedback mechanism, particularly in LTE's absence of HARQ feedback and NR's limited single feedback type configuration.
Innovation Solution
A method to determine HARQ feedback type configuration information based on service information, including QoS parameters and group information, allowing for flexible configuration of multiple feedback types in both unicast and groupcast transmissions, enhancing feedback efficiency and data transmission quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback mechanism is introduced in NR sidelink, then data transmission reliability is improved, but feedback efficiency remains low due to single feedback type configuration
Solution Approach 1:
The patent introduces dynamic HARQ feedback type selection, where the feedback type (ACK/NACK-only, ACK-only, or NACK-only) can be flexibly configured and switched based on service requirements, channel conditions, and groupcast scenarios. This dynamic configuration enables the system to adapt between different feedback mechanisms, optimizing feedback efficiency while maintaining reliability for different service types.
Solution Approach 2:
The patent changes the feedback mechanism parameters by introducing multiple HARQ feedback types with different characteristics. The network can configure different feedback types (full feedback, ACK-only, NACK-only) by modifying feedback parameter settings, allowing the system to adjust feedback overhead and reliability levels according to specific service requirements without changing the fundamental HARQ structure.
2Adaptability or versatility
If multiple HARQ feedback types are configured, then feedback efficiency and adaptability are improved, but system complexity increases
Solution Approach 1:
The patent implements preliminary configuration of HARQ feedback types through higher-layer signaling (RRC configuration). The network pre-configures multiple feedback type options and their corresponding parameters before data transmission begins. This preliminary setup allows the system to have multiple feedback types available without requiring complex real-time decision-making logic during data transmission, reducing operational complexity.
Solution Approach 2:
The patent uses feedback mechanisms at the configuration level, where the network device receives service information and group information feedback from terminals, then determines and configures the appropriate HARQ feedback type. This feedback loop enables automatic adaptation to different service scenarios without requiring manual configuration or complex terminal-side decision-making.
3Reliability
If HARQ feedback is implemented in LTE sidelink, then data transmission quality improves, but the system requires significant structural modifications
Solution Approach 1:
The patent makes the HARQ feedback mechanism universal by designing it to work across different sidelink scenarios (unicast, groupcast with different options, broadcast) and different service types (V2X, eMBB, etc.). The same basic HARQ feedback structure can be configured in different modes (ACK/NACK-only, ACK-only, NACK-only) to serve multiple functions and scenarios, eliminating the need for separate feedback mechanisms for different service types.
Data Source
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AI summary
Embodiments of this disclosure disclose a data transmission method, a device, and a medium. The data transmission method includes: determining hybrid automatic repeat request HARQ feedback type configuration information of a sending terminal device, where the HARQ feedback type configuration information is configured based on service information of a service, and the service information includes a quality of service QoS parameter of the service and/or group information of the service; and sending a data packet to a receiving terminal device based on the HARQ feedback type configuration information.