HARQ-ACK Codebook Triggering With Selective DCI Assistance

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Solution Overview

Problem

The existing communication systems waste resources due to the use of DCI format 1_1 to trigger one-shot HARQ-ACK codebooks without scheduling PDSCH, leading to unused fields and inefficient resource utilization.

Innovation Solution

The method involves transmitting DCI with assistance information to instruct terminals on selective HARQ-ACK codebook reporting, reducing the number of bits by focusing on specific serving cells, HARQ processes, transport blocks, or code block groups, and configuring high-level parameters for flexible HARQ-ACK feedback.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DCI format 1_1 is used to trigger one-shot HARQ-ACK codebook without scheduling PDSCH, then HARQ-ACK feedback can be obtained, but resource waste occurs due to unused fields

Engineering Contradiction:

ImproveHARQ-ACK feedback reliabilityVSAvoidresource utilization efficiency

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent extracts and utilizes only the necessary fields from DCI format 1_1 for triggering one-shot HARQ-ACK codebook, while identifying and removing or repurposing the unused fields. This selective extraction approach maintains the feedback functionality while eliminating resource waste associated with transmitting unnecessary information fields.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent makes DCI format 1_1 multi-functional by enabling it to serve both as a scheduling DCI (when PDSCH is scheduled) and as a triggering DCI for one-shot HARQ-ACK codebook (when PDSCH is not scheduled). This universal application allows the same DCI format to adapt to different operational modes, improving resource utilization while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If all HARQ-ACK information for all configured HARQ processes is fed back, then complete feedback is achieved, but the number of bits increases

Engineering Contradiction:

Improvefeedback completenessVSAvoidnumber of bits

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent segments the HARQ-ACK feedback into different priority levels or groups, allowing selective reporting based on configuration. Instead of uniformly reporting all HARQ-ACK information, the system divides the feedback into manageable segments that can be reported according to specific needs, reducing the total bit quantity while maintaining essential feedback completeness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements partial action by reporting only the necessary subset of HARQ-ACK information rather than all possible feedback. The one-shot codebook mechanism allows the network to configure which HARQ processes or serving cells need feedback, performing just enough action to meet the required feedback completeness without the excessive overhead of reporting everything.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12531660B2Information transmission method and device, and HARQ-ACK codebook generation and transmission method and device

Publication Date: 2026.01.20 VIVO MOBILE COMM CO LTD

AI summary

An information transmission method and device, and a HARQ-ACK codebook generation and transmission method and device, are provided. The information transmission method includes transmitting downlink control information DCI used for triggering a one-shot hybrid automatic repeat request acknowledgement HARQ-ACK codebook to report, where the DCI carries assistance information instructing a terminal to perform one-shot HARQ-ACK codebook reporting.