Aperiodic CSI Reporting via Downlink Grant on PUCCH

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Solution Overview

Problem

Existing wireless communication systems, particularly in NR, face challenges in efficiently reporting up-to-date channel state information (CSI) due to limitations in triggering aperiodic CSI reporting, which hinders optimal downlink scheduling.

Innovation Solution

The method involves configuring aperiodic CSI reporting on a physical uplink control channel (PUCCH) using a downlink grant, allowing faster CSI reporting by triggering A-CSI reports via DCI, with specific configurations and parameters for timing, frequency resources, and power control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If aperiodic CSI reporting is triggered by uplink grant only, then the system maintains simple triggering mechanisms, but the CSI reporting timeliness and downlink scheduling efficiency deteriorate

Engineering Contradiction:

ImproveCSI reporting delayVSAvoidtriggering mechanism complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The downlink grant DCI format is enhanced to serve dual purposes: both scheduling downlink data and triggering aperiodic CSI reporting. By adding a CSI request field to the existing DCI structure, the system enables downlink grants to trigger CSI reports without requiring separate triggering mechanisms, thus reducing delay while avoiding excessive complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the downlink scheduling function and CSI triggering function into a single DCI message. The CSI request field is integrated into the downlink grant DCI format, allowing the network to simultaneously schedule PDSCH and trigger A-CSI reporting in one control message, improving timeliness while maintaining unified control

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If multiple A-CSI reporting configurations are supported, then the system enhances reporting flexibility and adaptability, but the configuration complexity and signaling overhead increase

Engineering Contradiction:

ImproveCSI reporting flexibilityVSAvoidconfiguration complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple A-CSI reporting configurations are segmented into distinct configuration indices (e.g., first A-CSI configuration, second A-CSI configuration). Each configuration can be independently defined with different parameters such as PUCCH resources, timing offsets, and CSI report formats. The DCI CSI request field selectively triggers specific configurations based on current needs, providing flexibility without requiring all configurations to be active simultaneously

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically selects which A-CSI configuration to trigger based on current channel conditions and scheduling requirements. The network can flexibly switch between different A-CSI configurations by setting different values in the DCI CSI request field, allowing adaptive CSI reporting without permanent commitment to a single configuration scheme

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12563561B2Signaling aspects of aperiodic CSI reporting triggered by a downlink grant

Publication Date: 2026.02.24 QUALCOMM INC

AI summary

Aspects of the present disclosure provide techniques for configuring and triggering aperiodic channel state information (A-CSI) reporting via a downlink grant. As will be described in greater detail below, the A-CSI report may be conveyed via a physical uplink control channel (PUCCH).