INFORMATION-COLLECTING DEVICE, INFORMATION-COLLECTION METHOD, AND PROGRAM-RECORDING MEDIUM

• US 20170116861A1
• Filed: 03/18/2015
• Published: 04/27/2017
• Est. Priority Date: 03/28/2014
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: FUJIYAMA, Kenichiro, KIDA, Koji, ICHIHARA, Etsuko
• Granted Patent: US 9,959,766 B2
• Time in Patent Office: Days
• CPC Class Codes: G08G 1/0112 from the vehicle, e.g. floating car data [FCD]
• CPC Class Codes: G08G 1/0133 for classifying traffic situation
• CPC Class Codes: G08G 1/096716 where the received information does not generate an automatic action on the vehicle control
• CPC Class Codes: G08G 1/096741 where the source of the transmitted information selects which information to transmit to each vehicle
• CPC Class Codes: G08G 1/096775 where the origin of the information is a central station
• CPC Class Codes: G08G 1/164 Centralised systems, e.g. external to vehicles
• CPC Class Codes: G08G 1/166 for active traffic, e.g. moving vehicles, pedestrians, bikes
• CPC Class Codes: H04W 4/024 Guidance services
• CPC Class Codes: H04W 4/027 using movement velocity, acceleration information
• CPC Class Codes: H04W 4/40 for vehicles, e.g. vehicle-to-pedestrians [V2P]
• CPC Class Codes: H04W 4/46 for vehicle-to-vehicle communication [V2V]

Abstract

Information regarding moving bodies (00) that are in danger of colliding is collected at an appropriate frequency in accordance with the degree of danger. This information-collecting device has a risk calculation means and a transmission-interval determination means. The risk calculation means receives, from a plurality of moving bodies, state information that includes locations and velocities and is transmitted at provided time intervals. The risk calculation means also computes the distance between and relative velocities of two moving bodies. The transmission-interval determination means computes an interval such that the higher the relative velocities of two moving bodies are relative to the distance therebetween, the shorter the interval is, and provides the computed interval to said moving bodies.

Claims

1. An information-collecting device comprising:

a risk calculation unit that receives state information including a position and a speed from a plurality of moving bodies that transmit the state information at a notified time interval, and calculates a distance and a relative speed between two moving bodies; and

a transmission-interval determination unit that calculates an interval that is shortened depending on the relative speed with respect to the distance, and notifies the calculated interval to the two moving bodies.

2. The information-collecting device according to claim 1, further comprising:

a band acquisition unit that acquires, for each of the moving bodies, an available communication band of a base station that the moving body uses at a current position, wherein

the transmission-interval determination unit calculates, for each of the moving bodies, a lower limit from the communication band acquired by the band acquisition unit and a size of the state information, and, when the calculated interval is below the lower limit, notifies the lower limit to the moving body in place of the interval.

3. The information-collecting device according to claim 1, wherein

the risk calculation unit determines a route and a traveling direction in which a moving body moves from a temporal change of the position included in the state information, extracts two moving bodies that travel in the same direction in the same route, and calculates the distance and the relative speed between the extracted two moving bodies.

4. The information-collecting device according to claim 3, wherein

an identifier and section numbers that continuously increase or decrease from a starting point to an ending point are assigned to the route,

the position included in the state information includes a route identifier and a section number received from each of position-displaying devices that are placed along the route at regular intervals and transmit the identifier of the route and the section numbers, and

the risk calculation unit determines the route from the route identifier included in the state information, and determines the traveling direction in which a moving body moves from a temporal change of the section number.

5. An information-collecting system comprising:

the information-collecting device according to claim 1; and

a moving body that receives from the information-collecting device and stores a time interval, and transmits the state information at the stored time interval.

8. The information-collecting method according to claim 5, comprising:

determining a route and a traveling direction in which a moving body moves from a temporal change of the position included in the state information, extracting two moving bodies that travel in the same direction in the same route, and calculating the distance and the relative speed between the extracted two moving bodies.

9. The information-collecting method according to claim 8, wherein

an identifier and section numbers that continuously increase or decrease from a starting point to an ending point are assigned to the route,

the position included in the state information includes a route identifier and a section number received from each of position-displaying devices that are placed along the route at regular intervals and transmit the identifier of the route and the section numbers, and

the method further comprising determining the route from the route identifier included in the state information, and determining the traveling direction in which a moving body moves from a temporal change of the section number.

6. An information-collecting method comprising:

receiving state information including a position and a speed from a plurality of moving bodies that transmit the state information at a notified time interval, and calculating a distance and a relative speed between two moving bodies; and

calculating an interval that is shortened depending on the relative speed with respect to the distance, and notifying the calculated interval to the two moving bodies.

7. The information-collecting method according to claim 6, comprising:

acquiring, for each of the moving bodies, an available communication band of a base station that the moving body uses at a current position; and

calculating, for each of the moving bodies, a lower limit from the acquired communication band and a size of the state information, and, when the calculated interval is below the lower limit, notifying the lower limit to the moving body in place of the interval.

10. A machine-readable recording medium recording thereon a program that causes a computer to execute:

processing for receiving state information including a position and a speed from a plurality of moving bodies that transmit the state information at a notified time interval, and calculating a distance and a relative speed between two moving bodies; and

processing for calculating an interval that is shortened depending on the relative speed with respect to the distance, and notifying the calculated interval to the two moving bodies.