Time Domain Covariance Matrix for CSI Reporting

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) due to high overhead and potential inaccuracies in channel conditions, especially when using CSI compression methods that do not account for differences in channel conditions experienced by various UEs and beams.

Innovation Solution

The method involves a UE receiving configuration information to generate a time domain covariance matrix specific to itself, using CSI-RS and parameters to transmit a CSI report that includes data representing this matrix, allowing the base station to extrapolate and account for channel conditions, thereby improving CSI reporting accuracy and efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If CSI compression methods are used to reduce overhead, then reporting efficiency is improved, but measurement precision deteriorates due to potential inaccuracies in channel conditions

Engineering Contradiction:

ImproveCSI reporting efficiencyVSAvoidchannel condition accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by making the time domain covariance matrix UE-specific and beam-specific, allowing each UE and beam to have its own tailored covariance matrix that reflects its unique channel conditions, thereby maintaining measurement precision while using compression

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter representation by using covariance matrices that capture temporal correlations, transforming the CSI representation to include time domain characteristics while maintaining compression efficiency

Inventive Principle:

Principle #35Parameter changes

2Loss of substance

If generic CSI compression is applied, then overhead is reduced, but reliability deteriorates due to not accounting for differences in channel conditions experienced by various UEs and beams

Engineering Contradiction:

Improvesignaling overheadVSAvoidchannel condition representation

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The patent implements local quality by configuring UE-specific and beam-specific time domain covariance matrices, ensuring that each UE and beam has customized parameters that accurately reflect their individual channel conditions, thus maintaining reliability while reducing overhead

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies preliminary action by pre-configuring the time domain covariance matrices and related parameters before CSI reporting, allowing the system to prepare UE-specific compression parameters in advance, which ensures reliability is maintained while overhead is reduced during actual reporting

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250023610A1Time domain basis reporting for channel state information

Publication Date: 2025.01.16 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive configuration information that specifies one or more parameters associated with generating, by the UE, a time domain covariance matrix specific to the UE. The UE may receive a channel state information (CSI) reference signal (CSI-RS). The UE may transmit, based at least in part on the CSI-RS and the one or more parameters, a CSI report, the CSI report including data representing the time domain covariance matrix. Numerous other aspects are described.