HARQ-ACK Feedback Timing Optimization in Wireless Uplink
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing latency, particularly in uplink transmission processes such as HARQ feedback, which is crucial for providing faster internet access and improving next-generation mobile communication systems.
Innovation Solution
A method for transmitting HARQ-ACK information in a wireless communication system, where a terminal configured with multiple processing times receives downlink data and control channels and transmits HARQ-ACK information in an uplink subframe, with specific timing adjustments and bundling strategies to minimize latency, including a minimum interval of three or fewer subframes and use of specific PUCCH formats based on predetermined conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits HARQ-ACK information for all downlink data channels in an uplink subframe, then the completeness of feedback information is improved, but the latency is increased due to processing time requirements
Solution Approach 1:
The patent segments the HARQ-ACK feedback by dividing downlink subframes into different sets (first set and second set) corresponding to different processing times. The terminal transmits HARQ-ACK information selectively based on which processing time configuration is being used, rather than processing all downlink data channels uniformly. This segmentation allows the system to reduce latency by only processing the necessary subset of downlink subframes within the given uplink timing constraints.
2Loss of time
If the minimum interval between uplink and downlink subframes is reduced to three or fewer subframes, then the latency is reduced, but the processing complexity increases
Solution Approach 1:
The patent implements dynamic processing time configuration where the terminal can be configured with multiple processing time values (first processing time and second processing time). The system dynamically selects which processing time to use based on the specific uplink-downlink subframe timing requirements. This dynamic approach allows the terminal to adapt its processing complexity to match the latency requirements, using shorter processing times when latency is critical and longer processing times when completeness is prioritized.
3Productivity
If HARQ-ACK information is bundled when the number of downlink subframes is large, then the feedback overhead is reduced, but the granularity of feedback information is lost
Solution Approach 1:
The patent applies different feedback strategies to different sets of downlink subframes based on their specific characteristics. HARQ-ACK information for downlink subframes in the first set (associated with first processing time) and the second set (associated with second processing time) are handled separately. This local quality approach allows the system to maintain fine-grained feedback for subsets of subframes while enabling bundling when appropriate, optimizing both feedback efficiency and information granularity for different portions of the downlink traffic.
Data Source
AI summary
According to one embodiment of the present invention, a method by which a terminal configured to have two or more processing times transmits a hybrid automatic repeat request-acknowledgment (HARQ-ACK) in a wireless communication system comprises the steps of: receiving, from a base station, a downlink control channel for indicating a downlink data channel, and the downlink data channel in one or more downlink subframes; and transmitting, to the base station, HARQ-ACK information on the downlink data channel in an uplink subframe corresponding to the one or more downlink subframes, wherein the HARQ-ACK information transmitted in the uplink subframe includes HARQ-ACK information on a downlink data channel in accordance with only one processing time among the two or more processing times, and cannot include HARQ-ACK information on a downlink data channel in accordance with the rest processing times.