One-Shot HARQ-ACK Feedback for Low-Latency PDSCH Acknowledgment
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback, particularly in unlicensed frequency carriers, leading to increased latency and reduced reliability due to channel quality imperfections and regulatory constraints.
Innovation Solution
Implementing a one-shot HARQ-ACK feedback scheme with configurable parameters to enhance transmission opportunities, allowing for combined HARQ-ACK feedback across multiple PDSCHs and prioritized reporting based on priority indexes, thereby optimizing data transmission on both licensed and unlicensed frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional HARQ-ACK feedback transmission is used on unlicensed carriers, then channel access compliance is maintained, but transmission latency increases and reliability decreases
Solution Approach 1:
The patent applies preliminary action by performing channel sensing and securing transmission opportunities in advance before data transmission occurs. The gNB performs LBT procedures and reserves channel access opportunities beforehand, allowing HARQ-ACK feedback to be transmitted without waiting for channel availability, thus reducing latency while maintaining compliance with unlicensed carrier regulations.
Solution Approach 2:
The patent introduces an intermediary mechanism through the gNB's channel management function, which mediates between the need for timely feedback and unlicensed carrier channel access requirements. The gNB acts as an intermediary by performing LBT on behalf of the UE and managing channel access timing, enabling feedback transmission without direct UE channel sensing delays.
2Productivity
If multiple PDSCH transmissions are acknowledged separately, then individual feedback accuracy is maintained, but feedback overhead and complexity increase
Solution Approach 1:
The patent applies merging by combining multiple individual HARQ-ACK feedback messages into a single joint feedback transmission. Instead of requiring separate feedback for each PDSCH, the system merges acknowledgments for multiple PDSCH transmissions into one unified feedback message, reducing overhead and simplifying the feedback mechanism while maintaining individual feedback accuracy through separate acknowledgment bits within the joint message.
Data Source
AI summary
The present disclosure describes methods, system, and devices for configuring hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback for physical downlink shared channel (PDSCH) transmission. The method includes receiving, by a user equipment (UE), a radio resource control (RRC) parameter to configure a one-shot HARQ-ACK feedback mode; and receiving, by the UE, a first downlink control information (DCI) comprising a first K, the first DCI corresponding to a first PDSCH. The method includes receiving, by the UE, a second DCI comprising a second K with an applicable value and an one-shot request field with a positive value, the second DCI corresponding to a second PDSCH; and transmitting, by the UE, a one-shot HARQ-ACK feedback according to a preset rule.