Sidelink HARQ Feedback Indication in NR V2X
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Solution Overview
Problem
The existing New Radio (NR) V2x communication technology lacks clear definitions for enabling and configuring Hybrid Automatic Repeat Request (HARQ) feedback mechanisms, particularly for sidelink multicast communication, which affects resource allocation and communication efficiency.
Innovation Solution
A method and apparatus for indicating sidelink HARQ feedback, where a base station allocates resources to user equipment and includes indication information in downlink control signaling to determine whether to perform HARQ feedback and specify the feedback manner for both sidelink unicast and multicast communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback mechanism is enabled for sidelink communication, then communication reliability is improved, but device complexity increases due to lack of clear definition for multicast feedback manner
Solution Approach 1:
The patent segments the HARQ feedback configuration into distinct scenarios: unicast communication and multicast communication. For unicast, it defines specific feedback manners (first HARQ feedback manner), while for multicast, it provides separate guidance (second HARQ feedback manner). This segmentation resolves the complexity by providing clear, scenario-specific definitions rather than a single ambiguous rule.
Solution Approach 2:
The patent applies local quality by tailoring the HARQ feedback mechanism to different communication types. The base station sends first indication information for unicast and second indication information for multicast, allowing each communication type to have its own optimized feedback behavior. This localized configuration improves reliability for each scenario while maintaining overall system manageability.
2Productivity
If base station allocates resources without clear HARQ feedback indication, then resource allocation simplicity is maintained, but communication efficiency deteriorates due to uncertain feedback mechanisms
Solution Approach 1:
The patent merges the resource allocation function with the HARQ feedback configuration function in a single downlink control signaling message. The base station simultaneously conveys resource allocation information and HARQ feedback indication information (first and second indication information) in one signaling action. This merging improves communication efficiency by reducing signaling overhead while maintaining clear feedback mechanisms.
Solution Approach 2:
The base station performs preliminary action by pre-configuring the HARQ feedback indication information in the downlink control signaling before the actual sidelink communication occurs. This preliminary configuration ensures that both ends have clear understanding of the feedback mechanism before data transmission begins, improving efficiency without adding runtime complexity.
3Reliability
If clear HARQ feedback indication is provided for both unicast and multicast, then feedback reliability is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by providing HARQ feedback indication information selectively based on communication type. The base station includes first indication information for unicast and second indication information for multicast only when necessary. This partial provision of information ensures reliable feedback configuration while minimizing unnecessary signaling overhead for communications where feedback is not required.
Data Source
AI summary
A method for indicating a sidelink HARQ feedback includes: allocating a target resource to a user equipment to perform sidelink communication; sending a downlink control signaling to the user equipment, where the downlink control signaling includes the target resource and first indication information; the first indication information indicates at least one of the followings: when the user equipment uses the target resource allocated by the base station to perform sidelink unicast communication, whether to perform the sidelink HARQ feedback; when the user equipment uses the target resource allocated by the base station to perform sidelink multicast communication, whether to perform the sidelink HARQ feedback; when the user equipment uses the target resource allocated by the base station to perform the sidelink multicast communication, a feedback manner of performing the sidelink HARQ feedback.