HARQ-ACK Codebook Handling Across Repeated PUSCH Transmissions

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The 5G NR system lacks a specific method for determining a HARQ-ACK codebook on a PUSCH configured with repetition transmission or multiple PUSCHs scheduled by the same PDCCH, particularly when PUCCH carrying HARQ-ACK is overlapped with these PUSCHs.

Innovation Solution

A novel HARQ-ACK transmission method where the terminal device ignores the DAI in the DCI format for the PDCCH when determining HARQ-ACK on multiple PUSCHs, using specific determination methods based on semi-static or dynamic codebooks and configuration parameters to transmit HARQ-ACK on the PUSCHs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the terminal device transmits HARQ-ACK on PUSCH configured with repetition transmission or multiple PUSCHs scheduled by the same PDCCH, then the HARQ-ACK feedback coverage is improved, but the feedback becomes redundant and scheduling efficiency deteriorates

Engineering Contradiction:
ImproveHARQ-ACK feedback coverageVSAvoiddownlink scheduling efficiency
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent applies local quality by making the HARQ-ACK determination process different for different PUSCH scenarios. When PUCCH is overlapped with multiple PUSCHs, the terminal ignores DAI and uses semi-static codebook determination. When PUCCH overlaps with only one PUSCH, the terminal uses DAI-based dynamic codebook determination. This localized adaptation to different situations resolves the contradiction between comprehensive feedback coverage and avoiding redundant feedback.

Inventive Principle:
Principle #3Local quality

2Adaptability or versatility

If the terminal device uses DAI in DCI format to determine HARQ-ACK on PUSCH, then the feedback aligns with downlink scheduling, but the method is not applicable when PUCCH is overlapped with multiple PUSCHs

Engineering Contradiction:
Improveapplicability to different PUSCH configurationsVSAvoidHARQ-ACK determination accuracy
Core Design Contradiction:
Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent implements dynamics by making the HARQ-ACK determination method adaptive to the transmission scenario. The terminal dynamically selects between two modes: ignoring DAI and using semi-static codebook when PUCCH overlaps with multiple PUSCHs, or using DAI-based dynamic codebook when PUCCH overlaps with a single PUSCH. This dynamic adaptation ensures both versatility across different configurations and precision in HARQ-ACK determination.

Inventive Principle:
Principle #15Dynamics

Data Source

PatentEP3855650B1HARQ-ACK transmission method, terminal device and network device
Publication Date: 2025.10.29 DATANG MOBILE COMM EQUIP CO LTD
  • EP3855650B1 patent drawingFigure 1~2
  • EP3855650B1 patent drawingFigure 3~4
  • EP3855650B1 patent drawingFigure 5~7

AI summary

Disclosed are an HARQ-ACK transmission method, a terminal device and a network device, specifying how to transmit an HARQ-ACK on a PUSCH configured with repeat transmission or a plurality of PUSCHs scheduled by the same PDCCH. The HARQ-ACK transmission method includes: if the HARQ-ACK is transmitted on at least one of the plurality of PUSCHs corresponding to a PDCCH in addition to a first PUSCH, ignoring a DAI in a DCI format used in the PDCCH when the HARQ-ACK is determined; and transmitting the determined HARQ-ACK on the at least one PUSCH.