Aperiodic CSI Reporting on PUCCH via Downlink Grant Signaling

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Solution Overview

Problem

Existing wireless communication systems, particularly in NR and LTE, face challenges in efficiently reporting aperiodic channel state information (A-CSI) to ensure up-to-date channel conditions for optimal downlink scheduling, as current methods are either slow or limited in flexibility.

Innovation Solution

Configuring A-CSI reporting on a physical uplink control channel (PUCCH) using a downlink grant, allowing faster and more flexible A-CSI reporting by defining specific configurations and signaling mechanisms, including RRC parameters and dynamic indications for timing and resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If aperiodic CSI reporting is configured on PUCCH using downlink grant, then reporting speed and flexibility are improved, but signaling complexity and configuration overhead increase

Engineering Contradiction:

ImproveA-CSI reporting speedVSAvoidSignaling configuration complexity

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The patent pre-configures multiple A-CSI reporting configurations (first, second, third configurations) with different reporting behaviors, periodicities, and resource allocations before actual CSI reporting is needed. When the network needs to trigger A-CSI reporting, it simply activates a pre-configured option via downlink grant, avoiding complex real-time configuration signaling while enabling fast reporting.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables dynamic selection among multiple pre-configured A-CSI reporting configurations based on current channel conditions and scheduling requirements. The network can dynamically switch between different reporting configurations (e.g., from periodic to aperiodic, or changing reporting periodicity) without reconfiguring the entire system, thus achieving flexibility with limited signaling overhead.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If multiple A-CSI reporting configurations are maintained, then reporting flexibility and adaptability improve, but memory and processing requirements increase

Engineering Contradiction:

ImproveReporting configuration flexibilityVSAvoidConfiguration data volume

Core Design Contradiction:

Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent divides the A-CSI reporting configuration into multiple independent, modular configurations (first, second, third configurations), each with specific parameters like reporting periodicity, resource allocation, and trigger conditions. This segmentation allows the network to select and activate only the necessary configuration for current needs, reducing the amount of configuration data that must be actively managed while maintaining overall flexibility.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4094527B1Signaling aspects of aperiodic CSI reporting triggered by a downlink grant

Publication Date: 2025.11.19 QUALCOMM INC

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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).