O-RAN Antenna Calibration Mode Switching for RF Degradation

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Solution Overview

Problem

Conventional antenna calibration methods in O-RAN systems suffer from delayed calibration due to fixed notification periods, leading to potential data loss and reduced RF performance when environmental conditions change suddenly, especially during temperature fluctuations.

Innovation Solution

Adaptive switching of antenna calibration mode from coordinated to self-calibration mode is implemented, allowing the O-RU to initiate calibration without waiting for the expiration of the notification period, based on real-time RF performance metrics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If fixed notification period calibration is used, then system complexity is reduced and coordination is simplified, but calibration timeliness deteriorates and RF performance decreases when environmental conditions change suddenly

Engineering Contradiction:
Improvecalibration coordination complexityVSAvoidRF performance
Core Design Contradiction:
Device complexityVSReliability

Solution Approach 1:

The patent implements dynamic calibration mode switching that adapts between coordinated calibration mode and self-calibration mode based on real-time RF performance metrics. When performance degrades below a threshold, the system automatically transitions to self-calibration mode, enabling timely calibration without fixed notification periods. This dynamic adaptation resolves the contradiction by making the calibration system flexible rather than static.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the calibration operation mode parameter based on RF performance conditions. By monitoring RF performance metrics and comparing them against thresholds, the system switches between different calibration modes (coordinated vs. self-calibration), allowing timely response to environmental changes while maintaining manageable system complexity through standardized mode transitions.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If fixed notification period calibration is used, then calibration scheduling is simplified, but calibration timeliness deteriorates leading to data loss

Engineering Contradiction:
Improvecalibration schedulingVSAvoidcalibration delay
Core Design Contradiction:
Ease of operationVSLoss of time

Solution Approach 1:

In self-calibration mode, the O-RU autonomously initiates calibration without waiting for O-DU notification or coordination. The system monitors its own RF performance and automatically triggers calibration when needed, eliminating the fixed notification period delay. This self-service approach resolves the contradiction by enabling immediate calibration action when performance degradation is detected.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The system continuously monitors RF performance metrics and uses this feedback to determine when calibration is needed. By establishing a feedback loop that compares actual performance against thresholds, the system triggers calibration only when necessary, eliminating unnecessary delays while maintaining simple scheduling through clear trigger-based transitions between modes.

Inventive Principle:
Principle #23Feedback

3Stability of the object's composition

If coordinated calibration mode is used, then calibration coordination is maintained, but calibration responsiveness to environmental changes deteriorates

Engineering Contradiction:
Improvecalibration coordination stabilityVSAvoidcalibration adaptability
Core Design Contradiction:
Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The patent creates a dynamic calibration system that adapts its coordination level based on conditions. In normal operation, coordinated mode maintains stable O-DU-O-RU calibration coordination. When RF performance degrades, the system dynamically switches to self-calibration mode, allowing the O-RU to act independently and rapidly respond to environmental changes. This dynamic behavior resolves the contradiction between coordination stability and adaptive responsiveness.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the calibration mode parameter based on RF performance thresholds. By monitoring performance metrics and switching between coordinated and self-calibration modes, the system maintains coordination stability during normal operation while gaining adaptability when environmental changes occur, resolving the contradiction through conditional parameter changes.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS12506547B2Adaptive switching between open radio access network (O-RAN) assisted antenna calibration modes
Publication Date: 2025.12.23 QUALCOMM INC
  • US12506547B2 patent drawing
  • US12506547B2 patent drawing
  • US12506547B2 patent drawing

AI summary

A method of wireless communication by an open radio access network-radio unit (O-RU) includes transmitting to an open radio access network-distribution unit (O-DU), a first message including antenna calibration capabilities. The O-RU receives, responsive to the first message, a second message from the O-DU. The second message includes a subscription to calibration mode switching. The O-RU dynamically adapts an antenna calibration mode to a self-calibration mode in response to a radio frequency performance metric being less than a predefined threshold value prior to expiration of a calibration timer.