Channel State Reporting with Shared PMI Across Multiple TRPs

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Solution Overview

Problem

In new radio (NR) technology, when multiple transmission and reception points (TRPs) are used to provide services for a terminal, the terminal needs to feed back multiple precoding matrix indicators (PMIs), leading to a large signaling overhead and low transmission performance due to correlated channels.

Innovation Solution

A method for reporting channel state information (CSI) that involves measuring and reporting a shared precoding matrix indicator (PMI) based on at least one channel measurement resource (CMR), reducing the need for separate PMI feedback for each CMR and optimizing joint transmission across multiple CMRs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the terminal feeds back multiple PMIs separately for multiple TRPs, then the channel state information can be accurately obtained, but the signaling overhead becomes large

Engineering Contradiction:

Improvechannel state information accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent merges multiple separate PMI feedbacks into a single shared PMI that applies to multiple TRPs simultaneously. Instead of feeding back individual PMIs for each TRP, the terminal feeds back one PMI that is shared across multiple TRPs, thereby reducing signaling overhead while maintaining channel state information accuracy through joint optimization.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The shared PMI serves multiple TRPs simultaneously, making it a universal feedback mechanism that applies across different transmission points. This multi-functional approach allows a single PMI to control precoding for multiple TRPs, reducing the total number of feedback signals required while maintaining system performance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If the terminal feeds back multiple PMIs separately for multiple TRPs, then each TRP can be optimized independently, but the transmission performance deteriorates due to correlated channels

Engineering Contradiction:

ImproveTRP independent optimizationVSAvoidtransmission performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent combines the optimization of multiple TRPs into a unified approach by using a shared PMI. This merging approach recognizes that TRPs have correlated channels and optimizes them jointly rather than independently, leading to better transmission performance while adapting to the specific channel conditions of each TRP through the measurement process.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent changes the feedback parameter from multiple separate PMIs to a single shared PMI. This parameter change reflects the correlated nature of channels across TRPs and enables joint optimization that improves transmission performance while maintaining adaptability to different TRP conditions through the measurement and selection process.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20250240071A1Channel state information reporting method and apparatus, and storage medium

Publication Date: 2025.07.24 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

A method for reporting channel state information is performed by a terminal. The method includes: obtaining the channel state information through a measurement based on at least one channel measurement resource (CMR), wherein the channel state information includes a measurement result of the measurement based on the at least one CMR, and the measurement result includes a precoding matrix indicator (PMI) shared by the at least one CMR; and reporting the channel state information.