HARQ-ACK Codebook Sizing from DCI Time Offset Configuration
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Solution Overview
Problem
The determination of HARQ-ACK codebook information bits in the new radio (NR) system leads to redundant information bits, increasing resource overheads and reducing communication efficiency.
Innovation Solution
A method for determining a hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook by using configuration information to define specific time domain offset and location information sets, allowing for the reduction of redundant information bits and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the quantity of information bits is determined based on all combinations of union sets of time domain offset information sets and time domain location information sets, then the HARQ-ACK codebook can be constructed, but redundant information bits are generated increasing resource overheads
Solution Approach 1:
The patent extracts and removes redundant information bits from the HARQ-ACK codebook by identifying combinations of time domain offset information and time domain location information that do not correspond to any actual DCI format configuration. Only valid combinations that are actually configured are included in the codebook, eliminating unnecessary feedback bits while maintaining reliable HARQ-ACK construction.
Solution Approach 2:
Instead of including all possible combinations and then removing redundancies, the patent inverts the approach by only including valid, configured combinations from the beginning. The determination is based on actual DCI format configurations rather than theoretical union sets, fundamentally changing how the codebook size is calculated to avoid redundancy.
2Ease of manufacture
If redundant information bits are included in the HARQ-ACK codebook, then the codebook can be constructed using union sets, but resource overheads increase and communication efficiency decreases
Solution Approach 1:
The patent changes the parameters used for codebook construction from generic union sets of time domain information to specific parameters tied to actual DCI format configurations. By using configured time domain offset information and configured time domain location information that correspond to real DCI formats, the codebook size parameter is optimized to match actual communication needs, improving productivity without sacrificing ease of construction.
3Adaptability or versatility
If all combinations of time domain offset information sets and time domain location information sets are considered, then comprehensive coverage is achieved, but redundant information bits are generated
Solution Approach 1:
The patent segments the time domain configuration space into distinct groups based on actual DCI format configurations. Instead of treating all time domain offsets and locations as a single union set, it creates segmented groups where each group corresponds to specific DCI formats with their configured time domain parameters. This segmentation eliminates redundant combinations while maintaining adaptability to different configuration scenarios.
Data Source
AI summary
A method for determining an HARQ-ACK codebook includes that a terminal determines, based on a time domain offset of HARQ-ACK feedback information, a DCI format set corresponding to the time domain offset, and determines a time domain location information set based on the DCI format set to determine a quantity of information bits of the HARQ-ACK codebook based on the time domain location information set.