mTRP CSI Reporting With FDM-Based PMI, RI, and Port Indexing

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Solution Overview

Problem

Existing wireless communication technologies, such as NR and LTE, face challenges in improving spectral efficiency and integrating with other standards, particularly in multi-access systems, to support increasing mobile broadband access demands.

Innovation Solution

Implementing a frequency division multiplexing (FDM) scheme for channel state information (CSI) reporting in multiple transmitter receiver point (mTRP) scenarios, involving transmission via multiple CSI-RS resources or port groups, and transmitting precoding matrix indicators (PMIs) and layer indicators (LIs) associated with these groups.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frequency division multiplexing scheme is implemented for CSI reporting in mTRP scenarios, then spectral efficiency is improved, but system complexity increases

Engineering Contradiction:

Improvespectral efficiencyVSAvoidsystem complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the frequency domain into multiple independent sets, with each set associated with a specific CSI-RS resource or port group. This allows separate PMI reporting for each frequency segment, enabling parallel processing and improving spectral efficiency while maintaining manageable complexity through modular structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces frequency domain division as an additional dimension for organizing CSI reporting. By dividing the frequency domain into multiple sets and associating each set with specific CSI-RS resources, the system creates a multi-dimensional reporting structure that improves spectral utilization without significantly increasing processing complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If multiple PMI reports are transmitted for different frequency domain units, then measurement precision is improved, but information overhead increases

Engineering Contradiction:

ImproveCSI measurement precisionVSAvoidinformation overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent divides the frequency domain into multiple sets and transmits separate PMI reports for each set. This segmentation allows precise CSI measurement for each frequency segment while organizing the information efficiently to manage the overhead through structured reporting formats.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12413275B2Methods for PMI, RI and port indexing of CSI for multiple transmitter receiver points

Publication Date: 2025.09.09 QUALCOMM INC

AI summary

Aspects of the present disclosure provide techniques for channel state information (CSI) reporting in multiple transmitter receiver point (mTRP) scenarios.