Calibrating Distributed Antenna Ports via UE Feedback

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Solution Overview

Problem

Current wireless communication systems face challenges in accurately calibrating multiple base station (BS) transceivers due to timing, frequency, and phase offsets, which affect the coherence and synchronization of joint transmission across distributed antenna ports.

Innovation Solution

The implementation of a user equipment (UE) and base station (BS) system that measures and reports calibration offsets for non-zero-power channel state information reference signals (NZP CSI-RSs), allowing for the determination and transmission of calibration reports to adjust for delay, frequency, and phase offsets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple distributed antenna ports are used for joint transmission, then coverage and capacity are improved, but timing, frequency, and phase offsets occur between transceivers causing loss of coherence

Engineering Contradiction:

Improvejoint transmission capacityVSAvoidtransmission coherence

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the UE measures NZP CSI-RS from multiple TRPs, determines calibration offsets (delay, frequency, and phase), and reports these offsets back to the gNB. The gNB then uses this feedback to adjust and calibrate its transceivers, ensuring coherent joint transmission across distributed antenna ports while maintaining high productivity

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces physical/mechanical synchronization methods with signal-based electronic calibration. By using NZP CSI-RS measurements and digital signal processing to determine and compensate for timing, frequency, and phase offsets, the system achieves coherent transmission without requiring precise physical synchronization of distributed transceivers

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If calibration measurements are performed for multiple NZP CSI-RSs, then calibration precision is improved, but measurement and reporting overhead increases

Engineering Contradiction:

Improvecalibration offset accuracyVSAvoidreporting overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies partial action by having the UE measure and report calibration offsets selectively for K configured NZP CSI-RSs rather than all possible reference signals. The UE determines calibration offsets for the specific K TRPs that are configured and active, achieving sufficient calibration precision without the excessive overhead of comprehensive calibration reporting for all potential transceivers

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250192899A1Measurement for calibration

Publication Date: 2025.06.12 SAMSUNG ELECTRONICS CO LTD

AI summary

Apparatuses and methods for measurement for calibration. A method performed by a user equipment (UE) includes receiving information about K non-zero-power channel state information reference signals (NZP CSI-RSs), K>1, and a calibration report and measuring, based on the information, the K NZP CSI-RSs. The method further includes determining, based on the measurement, a calibration offset for each of the K NZP CSI-RSs and transmitting the calibration report including at least one indicator indicating the calibration offset for each of the K NZP CSI-RSs. Each of the K NZP CSI-RSs is associated with a CSI-RS port. The calibration offset corresponds to at least one of a delay offset (DO), a frequency offset (FO), and a phase offset (PO).