Multi-TRP CSI Reporting for Semi-Persistent Beam Management

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing beamforming between user equipment and multiple transmission reception points (TRPs) due to inadequate channel state information (CSI) reporting mechanisms, particularly in multi-TRP operations.

Innovation Solution

Implementing a baseband processor and transceiver in user equipment (UE) to collect and generate semi-persistent CSI reports from multiple TRPs, enabling efficient CSI reporting to a cell associated with these TRPs, using MAC CEs or DCI for activation/deactivation, and configuring TRPs as special cells for enhanced beam management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If semi-persistent CSI reporting is implemented for multi-TRP operation, then beam management effectiveness is improved, but signaling overhead and system complexity increase

Engineering Contradiction:

Improvebeam management effectivenessVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines CSI reporting for multiple TRPs into a unified semi-persistent reporting mechanism. The UE collects CSI from multiple TRPs and reports them together in a single SP-CSI report, rather than maintaining separate reporting mechanisms for each TRP. This merging approach improves beam management effectiveness across multiple TRPs while reducing the overall signaling overhead compared to individual reporting schemes.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The network configures the UE with SP-CSI reporting parameters in advance through RRC signaling or MAC CE activation before actual CSI reporting begins. This preliminary configuration includes setting up the reporting periodicity, resources, and TRP identifiers, allowing the semi-persistent reporting to commence without extensive real-time signaling overhead.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If comprehensive CSI collection from multiple TRPs is performed, then network performance optimization is improved, but processing requirements and time consumption increase

Engineering Contradiction:

Improvenetwork performance optimizationVSAvoidprocessing time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The semi-persistent CSI reporting mechanism establishes continuous periodic reporting cycles once activated. The UE continuously collects and reports CSI from multiple TRPs at configured intervals without requiring repeated configuration or activation signaling. This continuous operation enables ongoing network performance optimization while maintaining predictable processing time patterns rather than intermittent bursts of activity.

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The network can configure the UE to report CSI for all configured TRPs or selectively for subsets based on current network conditions and requirements. The SP-CSI report structure allows flexible inclusion of CSI from different TRPs, enabling the system to perform comprehensive analysis when needed while reducing processing burden when fewer TRPs are active or relevant.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4205476B1Reporting channel state information for multi-TRP operation

Publication Date: 2025.08.20 APPLE INC

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AI summary

A user equipment (UE) reports channel state information for multiple transmission reception points (TRPs) to a network. The UE collects channel state information (CSI) corresponding to multiple transmission reception points (TRPs), receives a signal configured to trigger a semi-persistent CSI (SP-CSI) report from a first TRP of the multiple TRPs, generates a SP-CSI report that includes CSI corresponding to each TRP of the multiple TRPs and transmits the SP-CSI report to a cell associated with the multiple TRPs.