# US 12,114,176 B2 · Propagation characteristic estimation device, propagation characteristic estimation method, and propagation characteristic estimation program

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- Number: US 12,114,176 B2
- Document ID: US12114176B2
- Status: Granted
- Kind: B2
- Application number: 17/765,114
- Filed: 2019-10-04
- Published: 2022-10-27
- Granted: 2024-10-08
- Earliest claimed: 2019-10-04
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Nobuaki Kuno; Wataru Yamada; Takatsune Moriyama; Yasushi Takatori
- Web page: https://patentgrep.com/patent/US12114176B2

## CPC

- H04B 17/3913: {Predictive models, e.g. based on neural network models}
- H04W 16/18: Network planning tools
- G06T 7/13: Edge detection
- H04B 17/27: for locating or positioning the transmitter
- H04B 17/347: {Path loss}
- G06N 3/08: Learning methods
- G06T 2207/10032: Satellite or aerial image; Remote sensing
- G06T 2207/20081: Training; Learning
- G06T 2207/30184: Infrastructure
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS

## Abstract

Provided are: an extraction unit that, based on input information from an external source, extracts position information regarding a transmitting station and a receiving station and the frequency of radio waves transmitted by the transmitting station; a calculation unit that calculates the three-dimensional distance between the transmitting station and the receiving station and the free space loss of radio waves based on the position information and the frequency; a processing unit that performs processing for, with use of a two-dimensional image of a region that includes the transmitting station and the receiving station, extracting the edges of structures that reflect radio waves in the two-dimensional image; a generation unit that generates input data for use in machine learning, based on the position information, the three-dimensional distance, the free space loss, and the edge; and a learning unit that performs machine learning to estimate the propagation characteristics of radio waves between the transmitting station and the receiving station with use of the input data generated by the generation unit.

## Claims

### Claim 1

A propagation characteristic estimation device for estimating a propagation characteristic of radio waves between a transmitting station and a receiving station that perform wireless communication, the propagation characteristic estimation device comprising:
a processor; and
a storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
based on input information from an external source, extract position information regarding the transmitting station and the receiving station and a frequency of radio waves transmitted by the transmitting station;
calculate a three-dimensional distance between the transmitting station and the receiving station and a free space loss of radio waves based on the position information and the frequency;
perform processing for, with use of a two-dimensional image of a region that includes the transmitting station and the receiving station, extracting an edge of a structure that reflects radio waves in the two-dimensional image;
generate input data for use in machine learning, based on the position information, the three-dimensional distance, the free space loss, and the edge; and
perform machine learning to estimate a propagation characteristic of radio waves between the transmitting station and the receiving station with use of the input data generated by the generation unit.

### Claim 2 (depends on 1)

The propagation characteristic estimation device according to claim 1, wherein the computer program instructions further perform to
judge whether or not a line segment that connects the transmitting station and the receiving station intersects the edge, and
in a case where the judgment unit judged that the line segment and the edge intersect, set a first distance to a distance from the transmitting station to a nearest structure edge and set a second distance to a distance from the receiving station to a nearest structure edge, in a case where the judgment unit judged that the line segment and the edge do not intersect, set the first distance and the second distance to a two-dimensional distance between the transmitting station and the receiving station, and make a determination that the first distance and the second distance that were set are to be included in the input data.

### Claim 3

A propagation characteristic estimation method for estimating a propagation characteristic of radio waves between a transmitting station and a receiving station that perform wireless communication, the propagation characteristic estimation method comprising:
an extraction step of, based on input information from an external source, extracting position information regarding the transmitting station and the receiving station and a frequency of radio waves transmitted by the transmitting station;
a calculation step of calculating a three-dimensional distance between the transmitting station and the receiving station and a free space loss of radio waves based on the position information and the frequency;
a processing step of performing processing for, with use of a two-dimensional image of a region that includes the transmitting station and the receiving station, extracting an edge of a structure that reflects radio waves in the two-dimensional image;
a generation step of generating input data for use in machine learning, based on the position information, the three-dimensional distance, the free space loss, and the edge; and
a learning step of performing machine learning to estimate a propagation characteristic of radio waves between the transmitting station and the receiving station with use of the input data that was generated.

### Claim 4 (depends on 3)

The propagation characteristic estimation method according to claim 3,
wherein the generation step includes
a judgment step of judging whether or not a line segment that connects the transmitting station and the receiving station intersects the edge, and
a determination step of, in a case where it was judged that the line segment and the edge intersect, setting a first distance to a distance from the transmitting station to a nearest structure edge and setting a second distance to a distance from the receiving station to a nearest structure edge, in a case where it was judged that the line segment and the edge do not intersect, setting the first distance and the second distance to a two-dimensional distance between the transmitting station and the receiving station, and making a determination that the first distance and the second distance that were set are to be included in the input data.