CSI-RS Reference Channel for Low-Overhead ML Channel Feedback

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Solution Overview

Problem

Existing wireless communication systems, particularly 5G NR, face challenges in efficiently managing channel state information (CSI) reporting, leading to overhead issues and suboptimal network performance.

Innovation Solution

Implementing a method where user equipment (UE) receives and transmits CSI-RS with varying resolutions, enabling improved CSI reporting by using a higher resolution CSI-RS to enhance accuracy and reduce overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional CSI reporting methods are used, then implementation is simple, but overhead is high and accuracy is insufficient

Engineering Contradiction:

ImproveCSI reporting accuracyVSAvoidreporting complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments CSI reporting into two distinct parts: compressed CSI data and target output data. The UE compresses the channel state information and separately provides target outputs that guide the gNB's reconstruction process. This segmentation allows accurate CSI reporting while reducing overall overhead by sending only essential compressed data plus targeted guidance information.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a new dimension to CSI reporting by adding target output data alongside compressed CSI. This additional dimension provides the gNB with guidance information that enables accurate reconstruction of channel state without requiring transmission of complete high-resolution CSI, thus improving accuracy while managing overhead.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If high resolution CSI-RS is transmitted, then CSI accuracy is improved, but overhead increases

Engineering Contradiction:

ImproveCSI accuracyVSAvoidsignal overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential elements needed for accurate CSI reporting: compressed channel state information and target output data. By taking out only what is necessary rather than transmitting complete high-resolution CSI, the system achieves accurate CSI reporting while significantly reducing signal overhead.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the parameter representation from transmitting raw high-resolution CSI to transmitting compressed CSI parameters along with target outputs. This parameter transformation enables the system to convey essential channel state information with reduced overhead while maintaining accuracy through the target output guidance.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If compressed CSI is transmitted, then overhead is reduced, but reconstruction accuracy deteriorates

Engineering Contradiction:

ImproveoverheadVSAvoidreconstruction accuracy

Core Design Contradiction:

Quantity of substanceVSMeasurement precision

Solution Approach 1:

The patent implements a feedback mechanism where the UE provides target output data to the gNB. This target output acts as feedback that guides the gNB's reconstruction process, enabling accurate reconstruction of channel state from compressed CSI by comparing against the provided target outputs and adjusting reconstruction accordingly.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250385753A1Reference channel state information reference signal (CSI-RS) for machine learning (ML) channel state feedback (CSF)

Publication Date: 2025.12.18 QUALCOMM INC

AI summary

An apparatus for wireless communication at a UE is provided. The apparatus is configured to receive a first channel state information reference signal (CSI-RS) from a network entity through a transmission channel. The apparatus is further configured to receive a second CSI-RS that has a higher resolution than the first CSI-RS, and determine channel information of the transmission channel and a target output based on the second CSI-RS. The apparatus is further configured to transmit the channel information and the target output to the network entity.