Radio Wave Propagation Evaluation in Dynamic Factory Environments

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Solution Overview

Problem

Conventional radio wave propagation evaluation systems using three-dimensional models are time-consuming and ineffective for real-time monitoring in dynamic factory environments, leading to prolonged downtime and increased costs due to the need for frequent updates and skilled engineers.

Innovation Solution

A radio operation management system that utilizes cameras and an evaluation device to detect environmental changes, correct the three-dimensional model, and recalculate radio wave propagation in real-time, focusing on affected paths and signal intensities, allowing for swift evaluation and reduced calculation time.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a three-dimensional model is created using laser scanners to evaluate radio wave propagation, then measurement precision is improved, but loss of time increases and productivity decreases

Engineering Contradiction:
Improveradio wave propagation evaluation accuracyVSAvoidevaluation time
Core Design Contradiction:
Measurement precisionVSLoss of time

Solution Approach 1:

The patent segments the evaluation process by dividing the factory space into multiple measurement positions. Instead of creating one comprehensive three-dimensional model of the entire factory, the system divides the space into smaller regions and performs radio wave propagation evaluations at each segmented position independently. This segmentation allows the evaluation to be completed much faster than creating a full factory model, while still providing sufficient accuracy for determining optimal base station locations.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by performing radio wave propagation evaluations only at selected measurement positions throughout the factory, rather than evaluating every point in the three-dimensional space. The system determines a plurality of measurement positions and conducts evaluations at these discrete locations, which provides adequate information for base station placement decisions without requiring exhaustive full-space evaluation.

Inventive Principle:
Principle #16Partial or excessive action

2Reliability

If the three-dimensional model is updated frequently to reflect environmental changes, then reliability of evaluation is improved, but loss of time and cost increase

Engineering Contradiction:
Improveradio wave propagation evaluation reliabilityVSAvoidmodel update time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The patent implements a dynamic evaluation approach where measurement positions are determined based on current environmental conditions and communication requirements. Rather than maintaining a static comprehensive three-dimensional model that requires frequent updates, the system dynamically selects relevant measurement positions and performs evaluations only where needed, adapting to environmental changes without requiring complete model reconstruction.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent performs preliminary determination of measurement positions based on anticipated evaluation needs. By pre-identifying where measurements should be taken based on the current factory layout and communication requirements, the system prepares the evaluation framework in advance, allowing for rapid execution when actual evaluations are needed without requiring time-consuming model updates.

Inventive Principle:
Principle #10Preliminary action

3Measurement precision

If a comprehensive three-dimensional model is created for the entire factory, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:
Improvepropagation environment measurement accuracyVSAvoidthree-dimensional model complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the factory space into multiple discrete measurement positions rather than creating a continuous comprehensive three-dimensional model. This segmentation simplifies the overall system complexity by breaking down the evaluation into manageable discrete points, reducing the computational and operational complexity while maintaining sufficient measurement precision for practical decision-making.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentEP3913961B1Radio operation management system and radio operation assistant method
Publication Date: 2023.12.13 HITACHI LTD
  • EP3913961B1 patent drawingFigure 1
  • EP3913961B1 patent drawingFigure 2
  • EP3913961B1 patent drawingFigure 3

AI summary

A radio operation management system supporting operation management of a radio communication system including a base station and a terminal includes a calculator including: a calculation device (12, 15); and a storage device (14) capable of being accessed by the calculation device (12,15), the calculation device (12, 15) executing predetermined calculation processing to implement functional units including: a model creation unit (13) that creates a three-dimensional model corresponding to an environment of a radio communication area; a propagation calculation unit (12, 15) that calculates, using the three-dimensional model, radio wave propagation evaluation only for a radio wave propagation path affected by a change in the environment; and a display unit (16) that presents an influence of the change in the environment, based on the radio wave propagation evaluation calculated.