MOBILE DEVICE, LOCATION ESTIMATION METHOD, AND COMPUTER-READABLE RECORDING MEDIUM

• US 20160227507A1
• Filed: 12/22/2015
• Published: 08/04/2016
• Est. Priority Date: 02/02/2015
• Status: Active Grant

• Current Assignee: FCNT LLC
• Original Assignee: Fujitsu Limited
• Inventors: Uchino, Makoto, Sakita, Satoshi
• Granted Patent: US 9,848,401 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01S 5/0268 by deriving positions from different combinations of signals or of estimated positions in a single positioning system
• CPC Class Codes: G01S 5/14 Determining absolute distances from a plurality of spaced points of known location
• CPC Class Codes: H04W 64/00 Locating users or terminals or network equipment for network management purposes, e.g. mobility management
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A mobile device estimates includes a processor configured to execute a process. The process includes first estimating a location of each of a plurality of base station devices present at a location communicable with the mobile device. The process includes generating a circle a radius of which is a distance between the mobile device and the base station device estimated by using radio wave intensity from the base station device, around the location of the base station device estimated at the first estimating, for each of the base station devices. The process includes second estimating a location of the mobile device by using algorithm selected based on the number of the circles of the base station devices generated at the generating and a location relation between the circles.

Claims

1. A mobile device comprising:

a processor configured to execute a process including;

first estimating a location of each of a plurality of base station devices present at a location communicable with the mobile device;

generating a circle a radius of which is a distance between the mobile device and the base station device estimated by using radio wave intensity from the base station device, around the location of the base station device estimated at the first estimating, for each of the base station devices; and

second estimating a location of the mobile device by using algorithm selected based on the number of the circles of the base station devices generated at the generating and a location relation between the circles.

2. The mobile device according to claim 1, wherein when a plurality of circles corresponding to each of the base station devices intersect at a point, the second estimating includes estimating that the point is the location of the mobile device.

3. The mobile device according to claim 1, wherein when a plurality of circles corresponding to each of three of the base station devices intersect with each other at two points, the second estimating includes estimating that an intersection point of a line segment joining a plurality of intersection points of the circles is the location of the mobile device.

4. The mobile device according to claim 1, wherein when an angle of each vertex of a triangle, in which a vertex is a location of each of three of the base station devices, is an acute angle, the second estimating includes estimating that a midpoint of a line segment joining a centroid of the triangle and a vertex corresponding to a location of a base station device having strongest radio wave intensity is the location of the mobile device.

5. The mobile device according to claim 1, wherein when an angle of any vertex of a triangle, in which a vertex is a location of each of three of the base station devices, is an obtuse angle, the second estimating includes estimating that a centroid of the triangle is the location of the mobile device.

6. The mobile device according to claim 1, wherein when a plurality of circles corresponding to each of two of the base station devices intersect with each other at two points, the second estimating includes estimating that an intersection point between a line segment joining a plurality of intersection points of the circles and a line segment joining a center of each of the circles is the location of the mobile device.

7. The mobile device according to claim 1, wherein when a plurality of circles corresponding to each of two of the base station devices do not intersect, the second estimating includes extracting a plurality of intersection points between a line segment joining a center of each of the circles and each of the circles, and estimating that a point obtained by dividing a line segment joining each of the intersection points by a radius ratio of the circles is the location of the mobile device.

8. A location estimation method comprising:

estimating a location of each of a plurality of base station devices present at a location communicable with a mobile device, using a processor;

generating a circle a radius of which is a distance between the mobile device and the base station device estimated by using radio wave intensity from the base station device, around the estimated location of the base station device, for each of the base station devices, using the processor; and

estimating a location of the mobile device by using algorithm selected based on the number of the generated circles of the base station devices and a location relation between the circles, using the processor.

9. A computer-readable recording medium having stored therein a location estimation program that causes a mobile device to execute a process comprising:

estimating a location of each of a plurality of base station devices present at a location communicable with the mobile device;

generating a circle a radius of which is a distance between the mobile device and the base station device estimated by using radio wave intensity from the base station device, around the estimated location of the base station device, for each of the base station devices; and

estimating a location of the mobile device by using algorithm selected based on the number of the generated circles of the base station devices and a location relation between the circles.