Wireless ACK Feedback Grouping for Unlicensed Spectrum Reliability
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Solution Overview
Problem
Wireless communications systems face challenges in providing reliable acknowledgment feedback, particularly in unlicensed radio frequency spectrums where transmissions may not be received correctly due to hidden interfering nodes or medium occupancy, leading to inefficiencies and increased latency.
Innovation Solution
Implementing enhanced dynamic or group-based acknowledgment feedback techniques, including hybrid automatic repeat request (HARQ) feedback for multiple downlink transmissions, with configurations for both group-based and one-shot feedback, and utilizing uplink DCI parameters like DAI and NFI to determine feedback reports, allowing efficient and reliable feedback reporting across multiple component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional acknowledgment feedback is used in unlicensed spectrum, then transmission reliability deteriorates due to hidden interfering nodes and medium occupancy, but switching to enhanced group-based feedback increases system complexity
Solution Approach 1:
The patent segments downlink transmissions into multiple groups (first group, second group, etc.) and assigns separate acknowledgment feedback for each group. This allows the system to provide reliable feedback for each transmission group independently, addressing the reliability issue in unlicensed spectrum while managing complexity through structured organization of feedback processes.
Solution Approach 2:
The patent implements dynamic feedback mechanisms where the wireless device can transmit different types of feedback (group-based or one-shot) based on received downlink control messages. The feedback approach adapts dynamically to transmission conditions, with the ability to switch between providing feedback for specific transmission groups or providing comprehensive feedback across all groups, thereby balancing reliability with system complexity.
2Loss of information
If one-shot feedback is transmitted for all configured feedback processes, then feedback completeness is improved, but feedback transmission latency increases
Solution Approach 1:
The patent enables dynamic selection between group-based feedback and one-shot feedback mechanisms. When a downlink control message indicates one-shot feedback is needed, the wireless device transmits comprehensive feedback for all configured feedback processes. Otherwise, it transmits feedback for specific transmission groups only. This dynamic approach ensures feedback completeness when necessary while minimizing latency in normal operating conditions.
Solution Approach 2:
The system changes the feedback transmission parameter based on received control information. The feedback scope parameter can be adjusted between 'specific group' and 'all groups' modes, allowing the system to optimize between information completeness and transmission latency by selecting the appropriate feedback scope for each transmission scenario.
3Productivity
If group-based feedback is used for multiple downlink transmissions, then feedback efficiency is improved, but handling medium occupancy and LBT failures becomes more complex
Solution Approach 1:
By segmenting feedback into transmission groups, the system can efficiently manage feedback for multiple downlink transmissions. Each group can be handled independently, allowing the wireless device to provide feedback for successfully received groups while dealing with LBT failures or medium occupancy issues on a per-group basis, thereby improving overall feedback efficiency while managing complexity through modular group handling.
Solution Approach 2:
The patent implements feedback mechanisms where downlink control messages indicate whether group-based or one-shot feedback should be transmitted. This feedback loop allows the system to adapt to medium occupancy conditions and LBT failures, with the ability to request comprehensive feedback when transmission reliability is in doubt, thereby improving productivity while providing structured handling of medium access challenges.
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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.