JP6169532B2 - Traffic volume measuring system, probe device, traffic volume measuring method, and program - Google Patents

Traffic volume measuring system, probe device, traffic volume measuring method, and program Download PDF

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JP6169532B2
JP6169532B2 JP2014106471A JP2014106471A JP6169532B2 JP 6169532 B2 JP6169532 B2 JP 6169532B2 JP 2014106471 A JP2014106471 A JP 2014106471A JP 2014106471 A JP2014106471 A JP 2014106471A JP 6169532 B2 JP6169532 B2 JP 6169532B2
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information
direction information
direction
traffic volume
traffic
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JP2015222494A5 (en
JP2015222494A (en
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原田 貴史
貴史 原田
山本 隆広
隆広 山本
啓造 村上
啓造 村上
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日本電信電話株式会社
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Description

  The present invention relates to a traffic volume measuring system, a probe device, a traffic volume measuring method, and a program for measuring traffic volume.

  In recent years, GPS (Global Positioning System) receivers are mounted on mobile terminals and car navigation systems, and traffic congestion is predicted using position information obtained by GPS. In addition, traffic congestion is predicted using VICS (road traffic information communication system) information.

  However, the current traffic jam situation cannot be accurately grasped in real time only by the VICS information. Therefore, a technique is known in which a probe device is installed in a vehicle (for example, in a car navigation system) to measure traffic flow of vehicles running on roads nationwide in real time and predict traffic jams ( For example, refer nonpatent literature 1).

"FILE NO.020 Latest Telematics Car Navi", [online], NTT Comware, [Search May 13, 2014], Internet <https://www.nttcom.co.jp/comzine/no056/newdragnet/index .html>

  When predicting traffic jams, personal information such as vehicle location information and vehicle identification information is sent to the analyst who makes the prediction. Such personal information may be related to the privacy of the information provider. There is sex. Therefore, in the prior art, there is a problem that the privacy of the information provider may be infringed by leakage of personal information by an outside malicious person.

  An object of the present invention made in view of such circumstances is to provide a traffic volume measuring system, a probe device, a traffic volume measuring method, and a program capable of preventing leakage of personal information when measuring traffic volume. It is in.

  In order to solve the above problem, a traffic measurement system according to the present invention is a traffic measurement system including a plurality of probe devices, a plurality of base stations, and an analysis server, and the probe device includes the probe device. A position information acquisition unit that acquires position information of the probe device, a direction information generation unit that generates direction information indicating a traveling direction of the probe apparatus from the position information at a predetermined observation point, and the direction information as packet data. A transmission unit for converting and transmitting to the base station, wherein the base station generates a reception unit that receives the direction information from the plurality of probe devices, and traffic information that aggregates the direction information every predetermined time And a direction information totaling unit that transmits to the analysis server, wherein the analysis server measures the traffic volume based on the traffic volume information received from the plurality of base stations. And butterflies.

  Moreover, in order to solve the said subject, the probe apparatus which concerns on this invention is a probe apparatus in the traffic volume measurement system which measures traffic volume using direction information, Comprising: The positional information acquisition which acquires the positional information on the said probe apparatus A direction information generation unit that generates direction information indicating the traveling direction of the probe device from the position information at a predetermined observation point, and a transmission unit that converts the direction information into packet data and transmits the packet data to a base station. And.

  In order to solve the above problems, a traffic volume measuring method according to the present invention is a traffic volume measuring method in a traffic volume measuring system comprising a plurality of probe devices, a plurality of base stations, and an analysis server, A step of acquiring position information of the probe apparatus by a probe apparatus; a step of generating direction information indicating a traveling direction of the probe apparatus from the position information at a predetermined observation point; and Generating the traffic information obtained by counting the direction information every predetermined time, the step of receiving the direction information from the plurality of probe devices by the base station, Transmitting to the analysis server, and measuring the traffic volume based on the traffic volume information received from the plurality of base stations by the analysis server. A step that, characterized in that it comprises a.

  In order to solve the above problem, a program according to the present invention includes a step of acquiring position information of a probe device in a computer functioning as a probe device in a traffic measurement system that measures traffic using direction information. The step of generating direction information indicating the traveling direction of the probe apparatus from the position information and the step of converting the direction information into packet data are executed at a predetermined observation point.

  According to the present invention, since vehicle position information and identification information are not transmitted to the base station, it is possible to prevent leakage of personal information when measuring traffic.

It is a block diagram which shows the structural example of the traffic measurement system which concerns on one Embodiment of this invention. It is a figure explaining the outline | summary of the traffic measuring method which concerns on one Embodiment of this invention. It is a flowchart which shows operation | movement of the probe apparatus which concerns on one Embodiment of this invention. It is a flowchart which shows operation | movement of the base station which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram illustrating a configuration example of a traffic volume measurement system according to an embodiment of the present invention. The traffic volume measurement system 1 includes a plurality of probe devices 10, a plurality of base stations 20, and an analysis server 30, and measures traffic volume using direction information. The base station 20 is connected to the analysis server 30 via a network. The probe device 10 performs wireless communication with the base station 20. In FIG. 1, only one probe device 10 and one base station 20 are shown.

  The probe device 10 includes an observation point database 11, a position information acquisition unit 12, a direction information generation unit 13, and a transmission unit 14. The probe device 10 is mounted on a moving object or a portable object. The moving object is a vehicle or a car navigation system that constitutes a part of the vehicle, and the portable object is a mobile phone, a smartphone (portable terminal), or the like. The probe device 10 may be a device externally attached to the outside, or may be a device (circuit) incorporated in advance in a car navigation system or a portable terminal.

  In addition, a computer can be suitably used for causing the probe device 10 to function, and such a computer stores a program describing processing contents for realizing each function of the probe device 10 in a storage unit of the computer. In addition, it can be realized by reading and executing this program by the CPU of the computer. This program can be recorded on a computer-readable recording medium.

  The observation point database 11 stores in advance observation point information indicating traffic volume observation points. The observation point is, for example, an intersection. The probe device 10 communicates with the base station 20 located in the vicinity of the observation point, but when there are a plurality of base stations 20 that can communicate in the vicinity of the observation point, the probe device 10 The identification ID may be associated and stored.

  The position information acquisition unit 12 receives a GPS signal transmitted from a GPS satellite, acquires the position information of the probe device 10, and outputs the position information to the direction information generation unit 13. When the vehicle has the probe device 10, the position information of the probe device 10 means the position information of the vehicle.

  The direction information generation unit 13 generates direction information indicating the traveling direction of the probe device 10 from the position information acquired by the position information acquisition unit 12 at a predetermined observation point. Specifically, the speed is obtained from the change in the position information, it is determined whether or not the probe device 10 is moving, and whether the probe device 10 is located near the observation point with reference to the observation point database 11. Determine whether or not. Then, the direction information generation unit 13 generates direction information indicating the traveling direction of the probe device 10 at the observation point based on the position information when the probe device 10 is moving and is located in the vicinity of the observation point. And output to the transmitter 14. When the predetermined observation point is an intersection, the direction information generation unit 13 uses the set of the traveling direction when entering the intersection and the traveling direction when exiting the intersection as direction information.

  The transmission unit 14 converts the direction information generated by the direction information generation unit 13 into packet data communicable with the base station 20, and transmits the packet data to the base station 20 closest to the observation point or the base station 20 associated with the observation point. Send.

  The base station 20 includes a receiving unit 21 and a direction information totaling unit 22. The base station 20 may use, for example, a wireless base station such as a mobile terminal base station or a small base station, or a wireless LAN base station. These base stations can be used in combination.

  The receiving unit 21 performs wireless communication with the plurality of probe devices 10, receives direction information from the plurality of probe devices 10, and outputs the direction information to the direction information totaling unit 22.

  The direction information totaling unit 22 totals the direction information input from the receiving unit 21 every predetermined time. Hereinafter, the direction information aggregated by the direction information aggregation unit 22 is referred to as “traffic volume information” in order to distinguish it from the direction information before aggregation. The direction information totaling unit 22 transmits the traffic information together with the identification ID of the base station 20 to the analysis server 30 via the network. If the number of probe devices 10 is extremely small, there is a risk of identifying personal information. Therefore, if the number of probe devices 10 is equal to or less than a predetermined threshold, traffic information is not generated. Also good.

  The analysis server 30 stores a table in which the identification ID of the base station 20 is associated with the position information of the base station 20 or the position information of the observation point. And the identification ID and traffic volume information of the base station 20 received from the several base station 20 are integrated, and the traffic volume in each observation point is measured. Note that the analysis server 30 may provide data to a user who analyzes the traffic volume as necessary.

[Traffic measurement method]
Next, the traffic volume measuring method by the traffic volume measuring system 1 will be described with reference to FIGS. FIG. 2 is a diagram for explaining the outline of the traffic volume measuring method by the traffic volume measuring system 1. FIG. 2 shows a case where there is one base station 20 and three probe devices 10 (10-1, 10-2, 10-3) located in a range where communication with the base station 20 is possible. ing.

  The probe devices 10-1, 10-2, and 10-3 each generate direction information indicating the traveling direction of the probe device 10 (steps S11, 12, and 13), and transmit the direction information to the base station 20.

  The base station 20 counts the direction information received from the probe devices 10-1, 10-2, and 10-3 every predetermined time (step S21), and transmits the traffic information to the analysis server 30. .

  The analysis server 30 receives traffic information at each observation point from the plurality of base stations 20, integrates them, and measures the traffic volume across the country (step S31).

  FIG. 3 is a flowchart showing details of the processing (step S11) of the probe apparatus 10. The probe apparatus 10 searches for a communicable base station 20 and determines a base station 20 that performs communication (step S101). Further, the position information acquisition unit 12 acquires position information of the probe device 10 (step S102).

  The direction information generation unit 13 calculates the speed of the probe device 10 (vehicle) from the change in position information (step S103), and determines whether the probe device 10 is moving (step S104). For example, when the speed of the probe device 10 exceeds a threshold value, it is determined that the probe device 10 is moving. If it is determined that the probe device 10 has not moved (step S104—NO), the process returns to step S102.

  When it is determined in step S104 that the probe device 10 is moving (step S104—YES), the direction information generation unit 13 refers to the observation point database 11 and the position of the probe device 10 is the observation point. It is determined whether it is in the vicinity (step S105). For example, when the difference in the distance between the position of the probe device 10 and the observation point is equal to or less than the threshold value, the position of the probe device 10 is determined to be near the observation point. If it is determined that the position of the probe device 10 is not near the observation point (step S105—NO), the process returns to step S102.

  If it is determined in step S105 that the position of the probe device 10 is in the vicinity of the observation point (step S105-YES), direction information is generated by the direction information generation unit 13, and the direction information is transmitted to the base by the transmission unit 14. Transmit to the station 20 (step S106). When the predetermined observation point is an intersection, the direction information generating unit 13 is based on the observation point database 11 and the position information, and the traveling direction (azimuth) when entering the intersection and the probe device 10 when exiting from the intersection. The traveling direction (orientation) is obtained, and the acquired set of traveling directions is transmitted as direction information to the base station 20 installed in the vicinity of the intersection. For example, when the probe device 10 is traveling north toward the intersection of the crossroads, turning left at the intersection and proceeding west, the information (north, west) is converted into packet data and transmitted to the base station 20.

  Note that the processing of the probe device 10 is not limited to the flow shown in FIG. 3. For example, when the determination in step S104 is NO, the processing may be returned to step S101, or the determination in step S105 is NO. In this case, the process may be returned to step S101. Further, the order of the processes does not have to be as shown in FIG. 3. For example, the process of determining the base station 20 that performs communication (step S 101) may be performed after the determination processes of steps S 104 and S 105.

  FIG. 4 is a flowchart showing details of the processing (step S21) of the base station 20. The receiving unit 21 acquires direction information from the plurality of probe devices 10 (step S201). The direction information totaling unit 22 totals the direction information every predetermined time. If the observation point is an intersection, the number of directions of entering and exiting the intersection is counted (step S202). The collected direction information of the plurality of probe devices 10 may be subject to aggregation only if it is within a predetermined range of predetermined variation, and information having a certain variation or more may not be subject to aggregation.

  The direction information totaling unit 22 transmits the totaled direction information as traffic volume information to the analysis server 30 together with the identification ID of the base station 20 (step S203). The position of the base station 20 is known, and the analysis server 30 can specify the observation point by the identification ID of the base station 20.

  As described above, according to the present invention, in measuring the traffic volume, the direction information notified from the probe apparatus 10 to the base station 20 and the position information of the base station 20 instead of the personal information such as the position information. And the base station 20 counts the direction information. With this configuration, personal information such as vehicle position information and vehicle identification information is not included in the packet data, and therefore leakage of personal information due to unauthorized analysis of packet data is prevented. Is possible.

  In addition, since the data integrated by the analysis server 30 does not include personal information, the data user who uses the data and the data collector who operates the base station 20 are different. Lower. Note that the present invention can be realized at low cost by using an existing base station for at least a part of the base station 20.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, a plurality of constituent blocks described in the embodiments can be combined into one, or one constituent block can be divided.

DESCRIPTION OF SYMBOLS 1 Traffic volume measurement system 11 Observation point database 12 Position information acquisition part 13 Direction information generation part 14 Transmission part 20 Base station 21 Reception part 22 Direction information totaling part 30 Analysis server

Claims (8)

  1. A traffic volume measurement system comprising a plurality of probe devices, a plurality of base stations, and an analysis server,
    The probe device includes:
    A position information acquisition unit for acquiring position information of the probe device;
    At a predetermined observation point, a direction information generation unit that generates direction information indicating the traveling direction of the probe device from the position information;
    A transmission unit that converts the direction information into packet data and transmits the packet data to a base station;
    The base station
    A receiving unit for receiving the direction information from the plurality of probe devices;
    A direction information totaling unit that generates traffic information that totals the direction information every predetermined time and transmits the traffic information to the analysis server,
    The traffic volume measuring system, wherein the analysis server measures traffic volume based on traffic volume information received from the plurality of base stations.
  2. The predetermined observation point is an intersection;
    2. The traffic volume measurement system according to claim 1, wherein the direction information generation unit uses a set of a traveling direction when entering the intersection and a traveling direction when exiting the intersection as the direction information.
  3. A probe device in a traffic measurement system that measures traffic using direction information,
    A position information acquisition unit for acquiring position information of the probe device;
    At a predetermined observation point, a direction information generation unit that generates direction information indicating the traveling direction of the probe device from the position information;
    A transmitter that converts the direction information into packet data and transmits the packet data to a base station;
    A probe apparatus comprising:
  4. The predetermined observation point is an intersection;
    The probe apparatus according to claim 3, wherein the direction information generation unit uses a set of a traveling direction when entering the intersection and a traveling direction when exiting the intersection as the direction information.
  5.   2. The traffic information according to claim 1, wherein the direction information totaling unit does not generate the traffic information when the number of the probe devices that collected the direction information by the receiving unit is less than a predetermined number. Traffic volume measurement system.
  6. A traffic volume measuring method in a traffic volume measuring system comprising a plurality of probe devices, a plurality of base stations, and an analysis server,
    By the probe device,
    Obtaining position information of the probe device;
    Generating direction information indicating a traveling direction of the probe device from the position information at a predetermined observation point;
    Converting the direction information into packet data and transmitting it to a base station;
    By the base station,
    Receiving the direction information from the plurality of probe devices;
    Generating traffic information obtained by tabulating the direction information every predetermined time, and transmitting to the analysis server;
    Measuring the traffic volume based on the traffic volume information received from the plurality of base stations by the analysis server;
    A traffic volume measuring method comprising:
  7. The predetermined observation point is an intersection;
    7. The traffic volume measuring method according to claim 6 , wherein the step of generating the direction information uses a set of a traveling direction when entering the intersection and a traveling direction when exiting the intersection as the direction information. .
  8. In a computer that functions as a probe device in a traffic measurement system that measures traffic using direction information,
    Obtaining position information of the probe device;
    Generating direction information indicating a traveling direction of the probe device from the position information at a predetermined observation point;
    Converting the direction information into packet data;
    A program for running
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