CSI Feedback Segmentation for Multi-TRP Channel Accuracy

Solution Overview

Problem

Current Channel State Information (CSI) feedback mechanisms in New Radio (NR) systems are inaccurate when multiple panels/beams/TRPs are simultaneously transmitted, leading to a mismatch between scheduling and actual channels, affecting data transmission quality.

Innovation Solution

The method involves determining and sending N pieces of feedback information, each including a Rank Indication (RI), a Precoding Matrix Indication (PMI), and a non-zero wideband amplitude coefficient, to the base station, where N is an integer greater than or equal to 1, to support simultaneous transmission and improve CSI feedback accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the current CSI feedback mechanism is used for single TRP/panel/beam transmission, then the feedback mechanism is simple and easy to implement, but the accuracy of CSI feedback is reduced when multiple panels/beams/TRPs are simultaneously transmitted

Engineering Contradiction:

Improveease of implementation of feedback mechanismVSAvoidaccuracy of CSI feedback

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent segments the feedback information into multiple independent pieces, each corresponding to a different TRP/panel/beam. Instead of providing a single aggregated feedback, the system now collects and processes N separate feedback information sets, where each set contains CRI, RI, PMI, and CQI for a specific transmission point. This segmentation allows the system to maintain simple feedback procedures for each individual TRP while accurately representing the overall multi-TRP channel state.

Inventive Principle:

Principle #1Segmentation

2Device complexity

If one CRI is fed back corresponding to one CSI-RS resource with one TCI, then the feedback mechanism is simple, but the feedback content is determined based on the assumption of single beam transmission which causes mismatch with actual multi-beam scheduling

Engineering Contradiction:

Improvecomplexity of feedback mechanismVSAvoidmatch between scheduling and actual channel

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent extends the feedback dimension from a single CRI-RI-PMI-CQI set to multiple such sets indexed by CRI. Instead of providing feedback in one dimension (single beam), the system now provides feedback across multiple dimensions (multiple beams/TRPs), where each dimension is represented by a complete feedback set. This dimensional expansion allows the feedback to comprehensively cover all active transmission points while maintaining the structured format of individual feedback elements.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Productivity

If multiple TRPs/panels/beams are simultaneously used to transmit data to a user, then the data transmission capacity is improved, but the existing feedback mechanism cannot provide accurate CSI for each transmission point

Engineering Contradiction:

Improvedata transmission capacityVSAvoidaccuracy of CSI for each TRP

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent segments the feedback information into multiple independent pieces, each corresponding to a different TRP/panel/beam. Instead of providing a single aggregated feedback, the system now collects and processes N separate feedback information sets, where each set contains CRI, RI, PMI, and CQI for a specific transmission point. This segmentation allows the system to maintain simple feedback procedures for each individual TRP while accurately representing the overall multi-TRP channel state.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a comprehensive feedback mechanism where the UE feeds back N pieces of information including CRI, RI, PMI, and CQI for each TRP/panel/beam. This detailed feedback loop enables the base station to accurately understand the channel state for each transmission point and make informed scheduling decisions, thereby maintaining high data transmission capacity with accurate CSI for multi-TRP operations.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11509371B2Information feedback method and device, storage medium, and electronic device

Publication Date: 2022.11.22 ZTE CORP

AI summary

Provided are an information feedback method and device, a storage medium, and an electronic device. The method includes that: N pieces of feedback information are determined according to one Channel State Information (CSI) report configuration, wherein the N pieces of feedback information includes N Rank Indications (RIs) and N Precoding Matrix Indications (PMIs), and N is an integer greater than or equal to 1; and the N pieces of feedback information are sent to a base station.