Joint CSI Feedback for Multi-TRP Interference-Aware DL Transmission

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Solution Overview

Problem

The existing NR Release 15 and 16 CSI feedback frameworks are inadequate for multi-TRP scenarios, leading to suboptimal CSI reporting due to inter-TRP interference and unnecessary measurement latency, as they do not support simultaneous transmission of CSI-RS resources with different beams and fail to consider inter-TRP coordination effectively.

Innovation Solution

A method and apparatus for jointly reporting CSI by linking two or more Resource Settings for channel measurement, allowing simultaneous transmission of CSI-RS resources from multiple TRPs, and reporting joint CSI parameters that account for inter-TRP interference, enabling efficient CSI reporting for multi-TRP DL transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate CSI reports are used for different TRPs, then inter-TRP interference can be measured, but measurement latency increases and CSI accuracy deteriorates

Engineering Contradiction:

ImproveCSI accuracyVSAvoidmeasurement latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent merges multiple CSI reports for different TRPs into a single joint CSI report. The UE is configured to report joint CSI parameters (joint CRI, joint RI, joint PMI, joint CQI) that collectively represent the channel state across multiple TRPs, thereby reducing measurement latency while maintaining CSI accuracy through unified inter-TRP interference measurement.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If CSI-RS resources are transmitted with different beams simultaneously, then multi-TRP transmission capability is improved, but the existing feedback framework becomes inadequate

Engineering Contradiction:

Improvemulti-TRP transmission capabilityVSAvoidfeedback framework complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent changes the CSI reporting parameters from separate TRP-specific reports to joint CSI parameters. The UE reports joint CRI indicating CSI-RS resources from multiple TRPs, joint RI for total layers, joint PMI for precoding across TRPs, and joint CQI for overall channel quality, enabling the feedback framework to adapt to multi-TRP simultaneous beam transmission.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If inter-TRP coordination is not considered, then CSI reporting is simpler, but CSI effectiveness for non-coherent joint transmission deteriorates

Engineering Contradiction:

ImproveCSI reporting simplicityVSAvoidCSI effectiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent implements feedback mechanisms that account for inter-TRP coordination. The joint CQI reported by the UE incorporates interference measurements from multiple TRPs, and the joint PMI provides precoding information that considers inter-TRP interference patterns, thereby improving CSI effectiveness for non-coherent joint transmission while maintaining reporting simplicity through unified parameters.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12562793B2Joint CSI feedback for multi-TRP based DL transmission

Publication Date: 2026.02.24 LENOVO (BEIJING) LTD

AI summary

Methods and apparatuses for jointly reporting CSI in multi-TRP based DL transmission are disclosed. In one embodiment, a method comprises transmitting a CSI reporting setting linked to two or more Resource Settings for channel measurement, wherein the two or more Resource Settings for channel measurement have the same number of CSI-RS resources, and receiving a joint CSI report corresponding to the CSI reporting setting.