CSI Age Reporting for High-Doppler Channel Adaptation

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Solution Overview

Problem

Existing CSI reporting schemes struggle to accurately track fast fading channels and high-Doppler channels, leading to outdated CSI reports that degrade link adaptation and overall system performance due to fluctuations in Signal-to-interference-plus-noise ratio (SINR).

Innovation Solution

Implementing CSI age reporting by indicating a first window for computing CSI before an uplink slot and a second window for the validity period of the CSI report, allowing for more accurate CSI reporting by smoothing out individual variations and ensuring the report's relevance over time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If CSI reporting is performed using existing schemes, then the system can maintain basic communication functionality, but the CSI reports become outdated in high-Doppler channels, degrading link adaptation and system performance

Engineering Contradiction:

ImproveCSI report accuracyVSAvoidCSI report latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by computing CSI over a first window length before the uplink slot and establishing a second window length for the validity period in advance. This allows the system to proactively prepare accurate CSI reports before they are needed, smoothing out individual variations and ensuring relevance over time, thereby resolving the contradiction between maintaining accuracy and reducing latency in high-Doppler channels

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by making the CSI computation adaptive to channel conditions through configurable window lengths. The first window length for computing CSI and the second window length for validity period can be adjusted based on Doppler conditions, allowing the system to dynamically optimize between accuracy and latency requirements for different channel scenarios

Inventive Principle:

Principle #15Dynamics

2Productivity

If the CSI report validity period is extended to reduce reporting frequency, then signaling overhead is reduced, but the CSI becomes outdated faster in high-Doppler channels

Engineering Contradiction:

Improvenetwork throughputVSAvoidCSI accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies parameter changes by introducing configurable window length parameters (first window for computation, second window for validity) that can be adjusted based on channel conditions. This allows the system to optimize the balance between reporting frequency and CSI accuracy for different Doppler scenarios, resolving the contradiction between maintaining throughput and preserving measurement precision

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12526023B2CSI age report for enhancement in high doppler channel

Publication Date: 2026.01.13 QUALCOMM INC

AI summary

This disclosure provides systems, methods, and devices for wireless communication that support CSI age reporting. In a first aspect, a method of wireless communication includes receiving, by a wireless communication device, a message indicating channel state information (CSI) age reporting; transmitting, by the wireless communication device, a CSI report associated with a first window length and a second window length and indicating at least the second window length, wherein the first window length is associated with computing CSI before an uplink slot of the CSI report, and wherein the second window length is associated with a period of time for which the CSI report is valid. Other aspects and features are also claimed and described.