Layer 1 Measurement Index Reporting for Smaller CSI Feedback

Solution Overview

Problem

The increasing size of CSI feedback in NR wireless communication systems, particularly for Layer 1 measurements such as L1-RSRP and L1-SINR, leads to coverage issues and high power consumption, especially for UEs with limited beam access capabilities.

Innovation Solution

UEs generate Layer 1 measurement reports using measurement indices without including measurement values, reducing the report size and enabling base stations to perform beam selection based on these indices.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If measurement values are included in Layer 1 measurement reports, then measurement precision is improved, but report size increases leading to coverage issues and high power consumption

Engineering Contradiction:

Improvemeasurement precisionVSAvoidreport size

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent extracts only the essential identification information (measurement index) from the full measurement data and transmits only this extracted portion in the Layer 1 measurement report. The base station uses pre-configured measurement indices to interpret which measurements are being reported, eliminating the need to transmit actual measurement values while maintaining measurement identification accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a measurement index as an intermediary element that maps to specific measurement configurations pre-defined in the base station. Instead of directly transmitting measurement values, the system uses these indices as mediators to convey measurement information, reducing report size while preserving the ability to identify and process specific measurements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If measurement values are included in Layer 1 measurement reports, then measurement precision is improved, but power consumption increases

Engineering Contradiction:

Improvemeasurement precisionVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent extracts only the essential identification information (measurement index) from the full measurement data and transmits only this extracted portion in the Layer 1 measurement report. The base station uses pre-configured measurement indices to interpret which measurements are being reported, eliminating the need to transmit actual measurement values while maintaining measurement identification accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If comprehensive measurement reporting is used, then beam selection accuracy is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvebeam selection accuracyVSAvoidprocessing overhead

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent performs preliminary action by pre-configuring measurement indices and their corresponding measurement configurations in the base station before actual measurement reporting. This pre-establishment of the measurement index-to-measurement mapping allows the base station to quickly interpret measurement reports without complex real-time processing, reducing processing overhead while maintaining beam selection accuracy.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12389254B2Layer 1 measurement reporting using measurement index

Publication Date: 2025.08.12 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may generate a Layer 1 measurement report identifying one or more measurements by corresponding measurement indices, refrain from including a measurement value in the Layer 1 measurement report for at least one measurement, and transmit the Layer 1 measurement report. Numerous other aspects are provided.