Time Domain Bundling of HARQ-ACK Feedback for 5G Scheduling Efficiency
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Solution Overview
Problem
The next-generation wireless communication system, particularly at frequencies above 52.6 GHz, faces challenges with short slot durations due to larger subcarrier spacings, leading to inefficiencies in data transmission scheduling and HARQ-ACK feedback mechanisms, which require enhanced methods to manage data transmission and feedback efficiently.
Innovation Solution
The implementation of time domain bundling of HARQ-ACK feedback and dynamic triggering mechanisms for joint and separate HARQ-ACK feedback in multi-TRP operations, allowing for flexible scheduling and reduced overhead in HARQ-ACK codebooks, with specific designs for PDSCH transmissions and uplink coverage adjustments based on UCI payload size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If larger subcarrier spacings are used to support frequencies above 52.6 GHz, then the system can operate at higher frequencies, but the slot duration becomes shorter leading to scheduling inefficiencies
Solution Approach 1:
The patent implements dynamic slot structure adaptation where the slot duration and scheduling parameters are dynamically adjusted based on the subcarrier spacing configuration. This allows the system to maintain optimal scheduling efficiency across different frequency ranges by adapting the time-domain structure to match the frequency-domain characteristics, resolving the contradiction between high-frequency operation and scheduling efficiency.
2Loss of time
If traditional HARQ-ACK feedback mechanisms are used with short slot durations, then the feedback can be transmitted quickly, but the overhead increases and efficiency decreases
Solution Approach 1:
The patent merges multiple HARQ-ACK feedback bits into bundled groups, combining multiple acknowledgment signals into a single transmitted unit. This bundling approach reduces the overall overhead in the HARQ-ACK codebook while maintaining the timing efficiency needed for short slot durations, thereby resolving the contradiction between fast feedback transmission and reduced overhead.
3Measurement precision
If separate HARQ-ACK feedback is transmitted for each PDSCH, then the feedback accuracy is maintained, but the overhead and processing complexity increase
Solution Approach 1:
The patent segments the HARQ-ACK feedback transmission into different bundling groups based on PDSCH characteristics, allowing selective bundling where appropriate while maintaining separate feedback where needed. This segmentation strategy preserves feedback accuracy for critical transmissions while reducing overall processing complexity through intelligent grouping of feedback elements.
Data Source
AI summary
Various embodiments herein are directed to time domain bundling of hybrid automatic repeat request-acknowledgement (HARQ-ACK) feedback. Other embodiments may be disclosed or claimed.