CSI Reference Resource for TDM mTRP CQI Accuracy

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Solution Overview

Problem

Current channel state information (CSI) calculation methods for time division multiplexed (TDM) based multiple transmission reception point (mTRP) transmissions do not accurately reflect the actual time domain resource allocation, leading to inefficiencies in wireless communication systems.

Innovation Solution

The proposed method involves calculating CSI using a CSI reference resource that includes one or more transmission time intervals (TTIs), where each TTI comprises a mini-slot, allowing for more precise CQI calculation by matching the assumptions to TDM schemes, such as Scheme 3 and Scheme 4, which involve code word repetition across mini-slots or across slots.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional CSI calculation methods are used for TDM based mTRP transmissions, then the existing protocol compatibility is maintained, but the accuracy of CSI reporting does not reflect the actual time domain resource allocation

Engineering Contradiction:

ImproveCSI reporting accuracyVSAvoidadaptability to TDM schemes

Core Design Contradiction:

Measurement precisionVSAdaptability or versatility

Solution Approach 1:

The patent changes the parameter definition of CSI reference resource from a single slot to multiple TTIs comprising one or more mini-slots. This parameter change enables the CSI calculation to accurately reflect the actual time domain resource allocation in TDM based mTRP transmissions, thereby improving CSI reporting accuracy while maintaining protocol compatibility.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If CSI is calculated using a single slot reference resource, then the calculation is simple, but it does not accurately reflect TDM based mTRP transmission characteristics

Engineering Contradiction:

ImproveCQI calculation accuracyVSAvoidCSI reference resource structure

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the CSI reference resource into multiple TTIs, where each TTI comprises one or more mini-slots. This segmentation allows the CSI calculation to accurately capture the time domain resource allocation characteristics of TDM based mTRP transmissions, improving CQI calculation accuracy while keeping the structure manageable through standardized mini-slot definitions.

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If mini-slot based CSI reference resource is used, then the time domain resource allocation is accurately reflected, but the complexity of determining the reference resource increases

Engineering Contradiction:

Improvetime domain resource allocation accuracyVSAvoidCSI reference resource determination

Core Design Contradiction:

Measurement precisionVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies preliminary action by pre-defining the structure of mini-slots and TTIs within the slot format configuration. This preliminary definition enables the UE to easily determine the CSI reference resource comprising multiple TTIs without complex calculations, thereby achieving accurate time domain resource allocation reflection while simplifying the determination process through advance configuration.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12519522B2CSI reference resource for TDM based multiple transmission reception transmissions

Publication Date: 2026.01.06 QUALCOMM INC

AI summary

Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for calculating and reporting channel state information (CSI) for time division multiplexed (TDM) based multiple transmission reception point (mTRP) transmissions.