UE Antenna Port Calibration for Non-Codebook Precoding

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Solution Overview

Problem

Existing uplink transmission schemes, particularly non-codebook-based transmission, face challenges due to varying phase and amplitude differences between antenna ports in user equipment, leading to suboptimal precoding and reduced transmission efficiency.

Innovation Solution

The user equipment determines its antenna port group calibration capability through phase and amplitude calibration, generating indicators for valid combinations of antenna ports, allowing it to communicate this capability to the network for efficient non-codebook-based precoding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If non-codebook-based transmission is used, then transmission flexibility is improved, but precoding accuracy deteriorates due to varying phase and amplitude differences between antenna ports

Engineering Contradiction:

Improvetransmission flexibilityVSAvoidprecoding accuracy

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by performing calibration of antenna port groups before actual transmission. The user equipment determines calibration capabilities and generates calibration capability indicators in advance, allowing the network to configure appropriate precoding methods before data transmission begins, thus resolving the accuracy issue while maintaining flexibility

Inventive Principle:

Principle #10Preliminary action

2Manufacturing precision

If phase and amplitude calibration is performed, then precoding accuracy is improved, but device complexity increases due to additional calibration procedures

Engineering Contradiction:

Improveprecoding accuracyVSAvoidcalibration procedure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent segments the calibration process into distinct components: determining calibration capability, measuring calibration parameters, and generating calibration capability indicators. This segmentation allows each component to be handled independently and simplifies the overall calibration management, reducing operational complexity while maintaining precision

Inventive Principle:

Principle #1Segmentation

3Productivity

If calibration capability indicators are generated and communicated, then transmission efficiency is improved, but information overhead increases

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidinformation overhead

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent extracts only the essential calibration capability information into compact indicators, separating the critical calibration status from the full calibration data. This extraction approach transmits only necessary information (calibration capability indicators) rather than complete calibration parameters, reducing information overhead while maintaining transmission efficiency

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS20260019167A1User equipment and network node

Publication Date: 2026.01.15 NOKIA TECHNOLOGIES OY

AI summary

A user equipment, UE, includes at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the user equipment at least to perform determining an antenna port group calibration capability of the UE, wherein the antenna port group calibration capability depends on at least one of phase calibration or amplitude calibration of one or more antenna port groups of the UE.