Wireless Link Judgment Using Fresnel Zone Point Clouds
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Solution Overview
Problem
Propagation loss due to shielding objects varies depending on the type of object, such as building walls or plants, making it challenging to determine communication feasibility between wireless stations.
Innovation Solution
A communication determination method that identifies partial point clouds of shielding objects within the Fresnel zone using point cloud data, decides evaluation criteria based on distribution, and determines communication availability based on these criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If propagation loss calculation uses only shielding rate, then calculation is simple, but accuracy is insufficient because different object types with same shielding rate have different propagation losses
Solution Approach 1:
The patent applies local quality by creating different evaluation criteria tailored to specific shielding object types. Instead of using a single uniform criterion, the system identifies the type of shielding object (building, plant, terrain, etc.) and applies specialized criteria for each type, allowing accurate propagation loss calculation that accounts for the unique characteristics of each object category.
Solution Approach 2:
The patent changes parameters by introducing multiple evaluation criteria with different parameters based on shielding object type. Each criterion set includes specific parameters relevant to that object type (e.g., building height and material for buildings, leaf area index for plants), transforming the single-parameter shielding rate approach into a multi-parameter system that captures the nuanced differences between object types.
2Reliability
If communication determination considers shielding object type, then determination accuracy improves, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the shielding object identification and evaluation process into distinct segments. The system segments shielding objects into different types (buildings, plants, terrain, etc.) and assigns specific evaluation criteria to each segment. This segmented approach manages complexity by handling each object type independently with its own optimized criteria set.
Solution Approach 2:
The patent uses copying by creating template-based evaluation criteria for different shielding object types. Instead of developing complex custom evaluation logic for each object, the system copies and adapts standardized criterion templates appropriate to each object type, reducing processing complexity while maintaining determination reliability.
Data Source
AI summary
A shielding object identifying unit identifies a partial point cloud representing a shielding object existing in a Fresnel zone on a basis of point cloud data indicating a position of the shielding object in the Fresnel zone between two wireless stations. A criterion decision unit decides an evaluation criterion of propagation loss by the shielding object on a basis of distribution of the partial point cloud. A determination unit makes determination related to communication between the two wireless stations on a basis of the evaluation criterion.