Group-Based and One-Shot Acknowledgment Feedback for Downlinks
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Solution Overview
Problem
Wireless communications systems face challenges in providing accurate acknowledgment feedback due to incorrect reception of downlink messages and interference, particularly in shared or unlicensed radio frequency spectrums, leading to suboptimal system performance.
Innovation Solution
Implementing enhanced dynamic and group-based acknowledgment feedback techniques, including one-shot feedback and configuration options for user equipment (UE) to provide feedback for multiple downlink transmission groups, with flexible feedback types based on component carriers and downlink control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional acknowledgment feedback is used for downlink transmissions in shared/unlicensed spectrums, then the feedback mechanism is simple, but feedback accuracy deteriorates due to hidden interfering nodes and LBT procedure failures
Solution Approach 1:
The patent segments the feedback mechanism into multiple types: group-based feedback for multiple downlink transmission groups and one-shot feedback for individual HARQ processes. This segmentation allows the system to handle different feedback scenarios appropriately, improving accuracy without requiring a single overly complex unified mechanism.
Solution Approach 2:
The patent implements dynamic feedback selection where the UE determines which feedback type to use based on real-time conditions. The gNodeB can dynamically switch between group-based and one-shot feedback modes, and the UE can dynamically adjust feedback timing and content based on LBT outcomes and transmission status, making the system adaptable to changing interference conditions.
2Productivity
If group-based feedback is implemented for multiple downlink transmission groups, then feedback efficiency improves, but feedback timing and resource allocation complexity increases
Solution Approach 1:
The patent applies preliminary action through advance configuration of feedback parameters including timing information, resource allocation, and feedback type selection. The gNodeB pre-configures the UE with feedback timing indicators and resource indicators before transmissions occur, allowing the UE to prepare feedback reports in advance and reducing real-time processing complexity.
Solution Approach 2:
The patent merges multiple feedback functions into unified feedback reports that can include both group-based feedback for multiple downlink transmission groups and one-shot feedback for individual processes. This merging allows efficient consolidation of feedback information while maintaining the ability to handle different feedback scenarios within a single report structure.
3Reliability
If one-shot feedback is used for each HARQ process, then feedback completeness improves, but system overhead and transmission time increase
Solution Approach 1:
The patent applies partial action by selectively transmitting feedback information based on what is actually needed. Rather than always transmitting complete one-shot feedback for all HARQ processes, the system can use group-based feedback when appropriate, or transmit partial feedback information only when necessary, reducing overall overhead while maintaining completeness when required.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that enable efficient group-based acknowledgment feedback reporting. Techniques are provided for feedback for a number of different downlink transmissions to be reported by a user equipment (UE) using transport block level feedback, code block group level feedback, or combinations thereof. Acknowledgment feedback may be provided in one or more group-based or enhanced dynamic feedback reports, a one-shot feedback report, or any combinations thereof.