NR DCI Feedback Codebook Generation for Multi-PDSCH Scheduling

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Solution Overview

Problem

In the New Radio (NR) system, the design of a downlink assignment index (DAI) indicator field and generation of a feedback codebook become urgent problems when one downlink control information (DCI) schedules multiple physical downlink shared channels (PDSCHs, leading to inefficiencies in feedback bit usage and increased DCI overheads.

Innovation Solution

The method involves generating a feedback codebook based on counter downlink assignment index (C-DAI) and total downlink assignment index (T-DAI) values contained in the DAI indicator field of the DCI, optimizing the feedback codebook design to minimize bit overheads and ensure clear understanding between communication nodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If one DCI schedules multiple PDSCHs, then scheduling efficiency is improved, but feedback bit wastage increases and DCI overheads increase

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidfeedback bit wastage

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent segments the feedback codebook into multiple sub-codebooks, where each sub-codebook corresponds to a specific PDSCH scheduled by the DCI. This segmentation allows the feedback bits to be allocated precisely to each PDSCH based on its actual feedback requirements, preventing wastage of feedback bits for PDSCHs that do not require feedback or have been successfully received.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic codebook generation where the feedback codebook structure is adaptively adjusted based on the actual scheduling information in the DCI. The codebook size and configuration are dynamically determined according to the number and types of PDSCHs scheduled, allowing the system to optimize feedback overhead for each specific scheduling scenario rather than using a fixed overhead structure.

Inventive Principle:

Principle #15Dynamics

2Productivity

If one DCI schedules multiple PDSCHs, then scheduling efficiency is improved, but DCI overheads increase

Engineering Contradiction:

Improvescheduling efficiencyVSAvoidDCI overheads

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent makes the DCI structure universal by introducing a multi-functional DAI indicator field that can handle multiple PDSCHs through a single DCI. The DAI field is designed to simultaneously provide counter DAI (C-DAI) and total DAI (T-DAI) information for multiple PDSCHs, allowing one DCI to serve multiple scheduling purposes without requiring separate control signals for each PDSCH.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the feedback codebook generation process with the DCI scheduling process by integrating C-DAI and T-DAI values directly into the DCI structure. This merging allows the feedback information to be carried within the existing DCI overhead rather than requiring separate feedback control channels, thereby reducing overall system overhead while maintaining the ability to schedule multiple PDSCHs efficiently.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250287388A1Information generation method, device, and storage medium

Publication Date: 2025.09.11 ZTE CORP

AI summary

Provided are an information generation method, a device, and a storage medium. The method includes: receiving a DCI sent by a second communication node, where the DCI is used for scheduling at least one PDSCH; and generating a corresponding feedback codebook according to a C-DAI value and a T-DAI value which are contained in a DAI indicator field in the DCI.