Terminal DAI Interpretation for HARQ-ACK Codebook Accuracy
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Solution Overview
Problem
In the context of extending New Radio (NR) frequency bands to frequencies higher than or equal to 52.6 GHz, there is a need for a technique to match the recognition of the size of the HARQ-ACK codebook between a base station and a terminal, particularly due to limitations in the current size of the Downlink Assignment Indicator (DAI) field.
Innovation Solution
A terminal is provided with a receiver to receive configuration information from a base station in high frequency bands and a controller that modifies the interpretation of the counter DAI and total DAI in the Downlink Assignment Indicator (DAI) included in control information, allowing for accurate recognition of the HARQ-ACK codebook size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the DAI field size is kept limited in current NR FR2 design, then device complexity is reduced, but the ability to accurately recognize HARQ-ACK codebook size in extended frequency bands (52.6 GHz to 71 GHz) deteriorates
Solution Approach 1:
The patent segments the DAI field into two separate fields: counter DAI and total DAI. The counter DAI counts the number of received DCIs, while the total DAI indicates the total number of DCIs to be received. This segmentation allows each field to have a smaller size (2 bits each) while collectively providing the capability to accurately determine HARQ-ACK codebook size even in extended frequency bands, thus resolving the contradiction between limited field size and accurate recognition capability.
2Adaptability or versatility
If the NR frequency band is extended from 52.6 GHz to 71 GHz, then the frequency band coverage is expanded, but the existing DAI interpretation mechanism becomes insufficient for accurate HARQ-ACK codebook size recognition
Solution Approach 1:
The patent introduces dynamic interpretation of the DAI fields based on frequency band configuration. When the operating frequency band is 52.6 GHz to 71 GHz, the terminal interprets the counter DAI and total DAI differently than in lower frequency bands. Specifically, in the extended band, the counter DAI counts received DCIs and the total DAI indicates total DCIs, enabling reliable HARQ-ACK codebook size recognition adapted to the extended frequency band characteristics.
3Stability of the object's composition
If the DAI field uses traditional interpretation method, then compatibility with current NR FR2 is maintained, but mismatch in HARQ-ACK codebook size recognition occurs between base station and terminal in extended frequency bands
Solution Approach 1:
The patent applies local quality by making the DAI interpretation method dependent on the specific frequency band context. The terminal and base station maintain the traditional DAI structure for compatibility, but apply different interpretation rules based on the operating frequency band. In the 52.6 GHz to 71 GHz band, a specialized interpretation method is applied locally to ensure consistent HARQ-ACK codebook size recognition, while other frequency bands continue to use the traditional method, thus maintaining both compatibility and avoiding recognition mismatches.
Data Source
AI summary
A terminal includes a receiver that receives configuration information transmitted from a base station in a high frequency band higher than or equal to a frequency band of a Frequency Range 2 (FR2) in a frequency range a New Radio (NR) system formed of a Frequency Range 1 (FR1), which is a low frequency range, and the FR2, which is a high frequency range; and a controller that modifies, based on the configuration information, an interpretation of at least one of a counter DAI and a total DAI in a Downlink Assignment Indicator (DAI) included in control information to be received from the base station.