Aperiodic CSI Measurement Reporting in LTE Interference Management

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Solution Overview

Problem

Current wireless communication systems, particularly in LTE, face challenges in efficiently managing interference and adapting traffic due to complexities in aperiodic channel state information (CSI) measurement reporting, which affects the accuracy and efficiency of interference coordination and resource allocation.

Innovation Solution

The proposed method involves defining and utilizing specific CSI reference resources for aperiodic CSI reporting, allowing for flexible and efficient measurement and reporting of CSI, even when triggered CSI subframes differ from the reporting subframes, thereby reducing unnecessary power consumption and complexity in user equipment (UE).

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If aperiodic CSI measurement is performed in all subframes, then measurement precision is improved, but device complexity and power consumption increase

Engineering Contradiction:

ImproveCSI measurement accuracyVSAvoidUE complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by differentiating between two types of subframes (first type and second type) with different CSI measurement and reporting requirements. Instead of uniform measurement across all subframes, the system applies localized measurement strategies: aperiodic CSI measurement is performed in first type subframes while periodic CSI measurement is used in second type subframes, optimizing resources based on local subframe characteristics.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements periodic action by using periodic CSI measurement and reporting for second type subframes, while aperiodic CSI measurement is triggered only when needed in first type subframes. This periodic approach reduces unnecessary measurements and reporting, thereby lowering UE complexity and power consumption while maintaining measurement precision where required.

Inventive Principle:

Principle #19Periodic action

2Loss of information

If aperiodic CSI reporting is triggered frequently, then information freshness is improved, but loss of energy increases

Engineering Contradiction:

ImproveCSI information freshnessVSAvoidUE power consumption

Core Design Contradiction:

Loss of informationVSUse of energy by moving object

Solution Approach 1:

The patent uses periodic CSI reporting for second type subframes to maintain baseline information freshness without triggering frequent aperiodic measurements. Aperiodic reporting is triggered only in first type subframes when updated CSI information is truly needed, reducing power consumption from frequent triggering while maintaining information freshness through a hybrid periodic-aperiodic approach.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system enables self-service by allowing the UE to autonomously determine whether to perform aperiodic CSI measurement based on the subframe type and triggering conditions. The UE can identify first type versus second type subframes and independently decide on measurement and reporting actions, reducing unnecessary power consumption while maintaining information freshness.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If CSI measurement and reporting procedures are simplified, then ease of operation is improved, but measurement precision deteriorates

Engineering Contradiction:

ImproveCSI reporting simplicityVSAvoidCSI measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent applies segmentation by dividing subframes into two distinct types with different CSI measurement and reporting procedures. This segmentation allows simplified periodic reporting for second type subframes while maintaining precise aperiodic measurement capability for first type subframes, achieving both ease of operation and measurement precision through differentiated procedures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamics by allowing the CSI measurement and reporting mechanism to adapt based on subframe type. The system dynamically switches between periodic and aperiodic measurement modes, and between different reporting procedures, depending on the specific subframe characteristics and network conditions, thereby maintaining precision while improving operational efficiency.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3140926B1Restricted aperiodic CSI measurement reporting in enhanced interference management and traffic adaptation

Publication Date: 2021.07.14 QUALCOMM INC

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AI summary

A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE. The UE determines a first CSI subframe set including a first set of subframes of a frame and a second CSI subframe set including a second set of subframes of the frame. Subframes in the first set of subframes are different than subframes in the second set of subframes. The UE determines a CSI reference subframe in one of the first CSI subframe set or the second CSI subframe set. The UE measures CSI in the CSI reference subframe. The UE receives an aperiodic CSI request in a triggering subframe in one of the first CSI subframe set or the second CSI subframe set. The triggering subframe is after the CSI reference subframe.