# US 11,909,459 B2 · Congestion degree estimation method using propagation loss of wireless communication, estimation device and estimation program

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- Number: US 11,909,459 B2
- Document ID: US11909459B2
- Status: Granted
- Kind: B2
- Application number: 17/289,214
- Filed: 2019-10-21
- Published: 2022-01-13
- Granted: 2024-02-20
- Earliest claimed: 2018-10-29
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Mitsuki Nakamura; Wataru Yamada; Yasushi Takatori
- Web page: https://patentgrep.com/patent/US11909459B2

## CPC

- H04B 17/27: for locating or positioning the transmitter
- G01S 7/006: {using shared front-end circuitry, e.g. antennas (G01S13/765, G01S13/825 take precedence)}
- G01S 11/06: using intensity measurements
- G01S 13/003: {Bistatic radar systems; Multistatic radar systems}
- G08G 1/0108: {based on the source of data}
- G08G 1/012: {from other sources than vehicle or roadside beacons, e.g. mobile networks}
- G08G 1/0133: {for classifying traffic situation}
- H04B: TRANSMISSION
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})

## Abstract

The following are executed: received power acquisition processing; propagation loss calculation processing of calculating propagation losses between the transmitter and the receiver, based on received power; median processing of calculating a median of a plurality of the propagation losses calculated in the propagation loss calculation processing in a predetermined time period, and outputting the median as propagation losses to be used for subsequent processing; loss peak acquisition processing of acquiring a maximum value of the propagation losses output in the median processing; distance calculation processing of calculating a distance between the transmitter or the receiver and blocking entities, at least based on the maximum value, heights of antennas, and a wavelength of the radio communication; and congestion degree calculation processing of estimating a congestion degree by calculating the number of the blocking entities in chronological order, based on the distance, integrating the number for a predetermined time period, and thereby calculating the number of the blocking entities per unit area.

## Claims

### Claim 1

An estimation method of estimating a congestion degree of blocking entities in a communication region between a transmitter and a receiver performing radio communication, the estimation method comprising:
acquiring received power;
calculating propagation losses between the transmitter and the receiver, based on the received power acquired in the acquiring of the received power;
calculating a median of a plurality of the propagation losses calculated in the calculating of the propagation losses in a predetermined time period determined in advance, and outputting the median as propagation losses to be used for subsequent processing;
acquiring a loss peak by acquiring a maximum value of the propagation losses output in the calculating of the median;
calculating a distance between the transmitter or the receiver and the blocking entities, at least based on the maximum value of the propagation losses acquired in the acquiring of the loss peak, heights of antennas of the transmitter and the receiver, and a wavelength of the radio communication; and
calculating the congestion degree by estimating the congestion degree by calculating the number of the blocking entities in chronological order, based on the distance calculated in the calculating of the distance, integrating the number for a predetermined time period determined in advance, and thereby calculating the number of the blocking entities per unit area.

### Claim 2 (depends on 1)

A non-transitory computer-readable medium having computer-executable instructions that, upon execution of the instructions by a processor of a computer, cause the computer to perform the steps according to claim 1.