TRP Subset Selection for Efficient 5G CSI Reporting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently selecting and reporting transmit-receive point (TRP) subsets, which affects channel state information (CSI) measurement and reporting, particularly in 5G/NR mobile communications.

Innovation Solution

A user equipment (UE) and base station (BS) are equipped with transceivers and processors to select and measure CSI-RS ports based on predefined states, enabling accurate CSI reporting through TRP subset selection and measurement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple TRPs are configured for CSI measurement, then coverage and reliability are improved, but device complexity and measurement overhead increase

Engineering Contradiction:

ImproveCSI measurement reliabilityVSAvoidUE measurement complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the TRP set into multiple subsets, where each subset contains a specific number of TRPs (e.g., 1, 2, or 3 TRPs). The UE is configured with multiple TRP subsets and performs CSI measurement on each subset separately. This segmentation reduces the complexity of measuring all TRPs simultaneously while maintaining reliable CSI through diverse subset measurements, directly resolving the contradiction between reliability and device complexity.

Inventive Principle:

Principle #1Segmentation

2Measurement precision

If comprehensive TRP measurement is performed, then CSI accuracy is improved, but measurement time and signaling overhead increase

Engineering Contradiction:

ImproveCSI accuracyVSAvoidMeasurement time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring multiple TRP subsets at the UE before actual CSI measurement. Each subset is pre-defined with specific TRPs and measurement parameters. When CSI measurement is needed, the UE can immediately measure the pre-configured subsets without spending time on configuration, thus achieving accurate CSI measurement while minimizing measurement time and signaling overhead.

Inventive Principle:

Principle #10Preliminary action

3Loss of information

If multiple CSI reports are transmitted, then reporting accuracy is improved, but uplink overhead increases

Engineering Contradiction:

ImproveCSI information completenessVSAvoidUplink signaling volume

Core Design Contradiction:

Loss of informationVSQuantity of substance

Solution Approach 1:

The patent merges multiple CSI reports corresponding to different TRP subsets into a single uplink transmission. The UE generates CSI reports for multiple subsets but transmits them together in one PUCCH or PUSCH message, rather than sending separate reports for each subset. This merging approach maintains complete CSI information while significantly reducing uplink signaling overhead and transmission complexity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12513732B2TRP subset selection and reporting

Publication Date: 2025.12.30 SAMSUNG ELECTRONICS CO LTD

AI summary

Apparatuses and methods for transmit-receive point (TRP) subset selection and reporting. A method performed by a user equipment (UE) is provided. The method includes receiving information about a channel state information (CSI) report. The information indicates N>1 groups of CSI reference signal (CSI-RS) ports and a list of S states. Each of the S states correspond to a subset of the N groups of CSI-RS ports. The method further includes, based on the information, selecting at least one state from the list of S states, measuring at least one of the N groups of CSI-RS ports, and determining CSI based on the measurement. The method further includes transmitting the CSI report including the determined CSI.