HARQ Codebook Determination via Processing Delay Assessment
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Solution Overview
Problem
Terminal devices face challenges in determining an accurate Hybrid Automatic Repeat reQuest (HARQ) codebook due to varying processing delays and unclear grouping rules from the base station, leading to potential misunderstandings and incorrect HARQ feedback.
Innovation Solution
The method involves determining a target HARQ codebook by assessing whether the first channel in the target channel group meets a processing delay. If it does, the codebook includes the corresponding HARQ codebook; otherwise, it does not, ensuring accurate feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the base station groups scheduled PDSCHs for flexible HARQ feedback, then the adaptability of HARQ feedback is improved, but the terminal device cannot determine the correct HARQ codebook size due to unclear grouping rules
Solution Approach 1:
The patent applies feedback mechanism by introducing Downlink Assignment Index (DAI) information in DCI formats. The DAI provides feedback to the terminal device about the grouping status and codebook size requirements, allowing the terminal to correctly determine which HARQ-ACK bits to include in the uplink transmission without explicit base station instructions on grouping rules.
Solution Approach 2:
The patent introduces DAI information as an intermediary element between the base station's grouping decision and the terminal's codebook construction. This intermediary carries essential information (counter DAI and total DAI) that mediates the understanding of HARQ codebook size, resolving the information asymmetry caused by the base station's internal grouping rules.
2Loss of information
If the terminal device includes all HARQ-ACK bits in the target HARQ codebook, then the completeness of feedback is improved, but the feedback timing requirement cannot be met when processing delay is insufficient
Solution Approach 1:
The patent implements partial action by allowing the terminal device to selectively include only those HARQ-ACK bits that can be prepared within the available processing time. When the first channel does not meet the processing delay requirement, the terminal excludes the corresponding HARQ-ACK bits from the target HARQ codebook, transmitting only the subset that can be processed in time.
Solution Approach 2:
The patent introduces dynamic adaptability where the terminal device dynamically adjusts the composition of the target HARQ codebook based on real-time processing capability assessment. The determination of which HARQ-ACK bits to include is not fixed but dynamically decided based on whether the first channel meets the processing delay requirement, allowing flexible adaptation to varying timing conditions.
Data Source
AI summary
An HARQ codebook determining method and apparatus, a terminal device, and a network device are disclosed. The method includes: a terminal device determines a target channel group, the target channel group including at least one channel, and a first channel in the target channel group corresponding to a first HARQ codebook; the terminal device determines a target HARQ codebook to be transmitted on a first uplink resource, wherein the first uplink resource is a HARQ feedback resource corresponding to the target channel group, if the first channel meets a first processing delay, the target HARQ codebook includes the first HARQ codebook, or if the first channel does not meet the first processing delay, the target HARQ codebook does not include the first HARQ codebook or the target HARQ codebook does not include the valid first HARQ codebook.