Sidelink HARQ-ACK Reporting for Control Node Retransmission Scheduling
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Solution Overview
Problem
In the NR system, the control node cannot directly determine the success of sidelink data packet transmission between terminals, as the HARQ-ACK information is not directly transmitted to the control node, leading to uncertainty in scheduling retransmissions.
Innovation Solution
A method for determining a target resource based on a configuration and sending sidelink information, including first sidelink information corresponding to a configured grant or multiplexed information, allowing the control node to receive and process HARQ-ACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback mechanism is introduced on sidelink for reliability improvement, then transmission reliability is improved, but control node cannot directly learn transmission success status
Solution Approach 1:
The patent introduces an intermediary information transmission mechanism where the receiving terminal sends HARQ-ACK feedback to the sending terminal via PSFCH, and the sending terminal reports this feedback status to the control node through uplink channels. This intermediary approach allows the control node to indirectly obtain transmission success information without direct sidelink-to-control-node feedback, resolving the contradiction between maintaining sidelink reliability and providing control node visibility.
Solution Approach 2:
The patent establishes a multi-stage feedback loop: first, the receiving terminal provides HARQ-ACK feedback to the sending terminal; second, the sending terminal reports the HARQ feedback status to the control node through uplink control channels (PUCCH/PUSCH). This feedback mechanism ensures the control node can determine whether retransmission is needed while preserving the sidelink HARQ reliability mechanism.
2Loss of information
If sidelink terminal transmits HARQ-ACK information to control node, then control node can determine transmission success, but transmission complexity and resource usage increase
Solution Approach 1:
The patent extracts only the essential information needed by the control node - the HARQ-ACK feedback status - rather than transmitting complete sidelink communication details. The sending terminal reports whether it received HARQ-ACK feedback and its content, allowing the control node to make scheduling decisions with minimal information overhead, thus reducing transmission complexity while maintaining necessary visibility.
3Reliability
If separate resources are allocated for sidelink information transmission, then transmission reliability is improved, but resource utilization efficiency decreases
Solution Approach 1:
The patent merges sidelink information transmission with existing uplink communication resources. The sending terminal uses configured uplink resources (PUCCH or PUSCH) that are already allocated for other purposes to report HARQ-ACK feedback status to the control node. This resource sharing approach eliminates the need for dedicated sidelink feedback resources, improving resource utilization while maintaining reliable information transmission through the established uplink channels.
Data Source
AI summary
Embodiments of this disclosure provide a sidelink information transmission method, a terminal, and a control node. The method includes: determining a target resource based on a target resource configuration; and sending target sidelink information on the target resource, where the target sidelink information is first sidelink information corresponding to a first configured sidelink grant, or the target sidelink information is multiplexed information of the first sidelink information and first information, where the first information is sidelink information corresponding to other scheduling than the first configured sidelink grant.