Environmental Factor Path Loss Modeling for Fast Radio Propagation
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Solution Overview
Problem
Existing radio propagation path loss models are either computationally intensive or lack accuracy when applied to diverse environmental factors, leading to costly and time-consuming network planning and optimization.
Innovation Solution
A method for calculating outdoor radio propagation path loss using parameterized environmental factors, segmenting scenarios into regions, labeling each with a path loss exponent, and iteratively updating these exponents using measurement data to achieve low computational complexity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deterministic models (ray-tracing or ray-launching) are used to calculate path loss, then accuracy is improved, but computational complexity and time consumption increase significantly
Solution Approach 1:
The patent divides the outdoor scenario into multiple regions based on environmental factors (buildings, trees, foliage, street furniture, pedestrians, weather conditions). Each region is assigned a specific path loss exponent that characterizes its propagation characteristics. This segmentation allows the complex continuous propagation environment to be represented as discrete regions with simplified parameters, reducing computational complexity while maintaining accuracy.
Solution Approach 2:
The patent assigns different path loss exponents to different regions based on their specific environmental characteristics. Instead of using a uniform model for the entire area, each region receives a localized path loss exponent that reflects its unique propagation properties (e.g., higher path loss exponents for regions with dense foliage or buildings). This local differentiation maintains accuracy without requiring complex global computations.
2Device complexity
If empirical models are used to calculate path loss, then computational complexity is reduced, but accuracy deteriorates when applied to different environments
Solution Approach 1:
The patent uses parameterized environmental factors where each region is characterized by a path loss exponent parameter that can be adjusted based on the specific environmental conditions. This parameterization allows the model to adapt to different environments by changing the path loss exponent values rather than requiring completely different models. The parameters are derived from measurement data and can be updated to reflect local propagation characteristics, maintaining accuracy across diverse environments while keeping computations simple.
3Measurement precision
If comprehensive environmental factors are considered in path loss calculation, then accuracy is improved, but computational burden increases
Solution Approach 1:
The patent performs preliminary classification of the outdoor scenario into regions with distinct environmental factors before performing path loss calculations. By pre-segmenting the environment and assigning path loss exponents to each region in advance, the actual path loss calculation becomes a simple process of summing contributions from these pre-characterized regions. This preliminary action eliminates the need for complex real-time computations while maintaining comprehensive consideration of environmental factors.
Data Source
AI summary
The present invention relates to a novel radio propagation path loss calculation method considering environmental factors comprehensively, including building, road, foliage, pedestrians, etc. In an example, the path loss calculation method includes the steps of segmenting the scenario of interest into several regions, assigning each region with a path loss exponent, generating straight-line path information between the Tx region and the Rx region, calculating the path loss by accumulating the weighted path loss of each region in the straight-line path and updating the environmental factor-related path loss exponent using measurement data. A major contribution of this invention is the introduction of the path loss exponent related to each environmental factor, which enables a fast and accurate path loss calculation.