JP2016152010A - Accumulation device and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow enhancement in effectiveness of accumulation information.SOLUTION: An accumulation device including an accumulation unit capable of accumulating roadside information that is transmitted from a roadside communication unit to an onboard communication unit, comprises: a collection unit for collecting the roadside information; and an accumulation processing unit which makes the accumulation unit accumulate only dynamic information among the roadside information collected by the collection unit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a storage device and a computer program.

In recent years, as part of Intelligent Transport Systems (ITS), information transmitted and received by inter-vehicle communication, which is a 700 MHz band wireless system, is transmitted to a central device, and this information is controlled by the central device. It is being considered for use.
Such an intelligent road traffic system is mainly composed of a plurality of roadside communication devices that are roadside wireless communication devices installed in the vicinity of an intersection and a plurality of in-vehicle communication devices that are wireless communication devices mounted on each vehicle. Thus, the plurality of roadside communication devices can transmit / receive information to / from a central device installed in a traffic control center, for example, via a communication line.

  In this intelligent road traffic system, the communication combination between each communication subject includes road-to-vehicle communication in which various information is wirelessly transmitted from the roadside communication device to the vehicle-mounted communication device, and vehicle-to-vehicle communication in which the vehicle-mounted communication devices communicate with each other. It is assumed. The roadside communication device can intercept vehicle information including time information and position information transmitted and received by inter-vehicle communication. Therefore, if the roadside communication device transmits the vehicle information acquired from the vehicle to the central device, the central device can use the vehicle information for traffic signal control (see Non-Patent Documents 1 and 2).

ITS Information Communication System Promotion Conference, “700 MHz Band Intelligent Transport System Extended Function Guidelines ITS FORUM RC-010 1.0 Edition”, [online], March 15, 2012, [Search January 9, 2015] Internet <http://www.itsforum.gr.jp/> ITS Information and Communication System Promotion Conference, “700 MHz Band Intelligent Transportation System Experimental Vehicle-to-Vehicle Communication Message ITS FORUM RC-013 1.0 Edition”, “online”, March 31, 2014, [January 9, 2015 Day search], Internet <http://www.itsforum.gr.jp/>

A dedicated communication line (analog: 9600 bps, digital: 64 kbps) is used as a communication line between the roadside communication device and the central device constituting the above-described intelligent road traffic system, and there is a certain restriction on the communication capacity.
However, in vehicle-to-vehicle communication, data of about 100 bytes is transmitted every predetermined period (100 ms), so that vehicle information of all vehicles is collected from the roadside communication device to the central device via the communication line. Not realistic. For this reason, it is usually assumed that the minimum information to be used in real time for signal control and traffic information generation is collected in the central apparatus via the communication line.

In addition, when offline information analysis is required for accident investigation, crime investigation, traffic evaluation (safety and smoothness evaluation), and other purposes, roadside information transmitted by road-to-vehicle communication and transmitted by vehicle-to-vehicle communication It is assumed that a certain amount of information such as vehicle information to be stored is accumulated in the roadside communication device and this accumulated information is utilized. In this case, the roadside communication device needs a storage medium for storing the predetermined amount of information. In recent years, inexpensive and large-capacity storage media such as HDDs have been marketed in recent years, but in roadside communication devices, storage media that are sufficiently reliable in outdoor conditions with severe environments such as temperature and vibration are constructed at low cost. There is a certain restriction on the storage capacity because it is necessary. For this reason, it is difficult to store all roadside information and vehicle information in the storage medium of the roadside communication device.
In view of such circumstances, an object of the present invention is to increase the effectiveness of stored information.

  An accumulation device according to an aspect of the present invention is an accumulation device including an accumulation unit capable of accumulating roadside information transmitted from a roadside communication device to an in-vehicle communication device, the collection unit collecting the roadside information; And an accumulation processing unit that accumulates only dynamic information in the accumulation unit from the roadside information collected by the collection unit.

  An accumulation device according to an aspect of the present invention is an accumulation device including an accumulation unit capable of accumulating vehicle information transmitted by an in-vehicle communication device, the collection unit collecting the vehicle information, and the collection unit Among the vehicle information, an accumulation processing unit that accumulates the vehicle information transmitted by one in-vehicle communication device as an accumulation unit in the accumulation unit, and the content of each vehicle information accumulation unit that is accumulated in the accumulation unit. A setting unit that sets a storage priority based on the storage unit, and a deletion processing unit that sequentially deletes the storage units with the lowest storage priority when the vehicle information stored in the storage unit exceeds a predetermined capacity. Storage device.

  A computer program according to an aspect of the present invention is a computer program for causing a computer to execute a process of storing roadside information transmitted from a roadside communication device toward an in-vehicle communication device in a storage unit. A computer program for functioning as a collection unit that collects roadside information and an accumulation processing unit that accumulates only dynamic information in the accumulation unit from the roadside information collected by the collection unit.

  The computer program which concerns on 1 aspect of this invention is a computer program for making a computer perform the process which accumulate | stores the vehicle information which the vehicle-mounted communication apparatus transmitted in the storage part, Comprising: The collection part which collects the said vehicle information in a computer An accumulation processing unit for accumulating vehicle information transmitted by one in-vehicle communication device as an accumulation unit in the accumulation unit among the vehicle information collected by the collection unit, and the vehicle information accumulated in the accumulation unit For each storage unit, a setting unit that sets the storage priority based on the contents thereof, and when the vehicle information stored in the storage unit exceeds a predetermined capacity, the storage units with the lower storage priority are deleted in order. It is a computer program for functioning as a deletion process part.

  According to the present invention, the effectiveness of stored information can be increased.

It is a road top view of the traffic signal control system concerning the embodiment of the present invention. It is a block diagram which shows the internal structure of a roadside communication apparatus. It is a flowchart which shows the content of the accumulation | storage process of the vehicle information which a roadside communication apparatus performs. It is a flowchart which shows the content of the accumulation | storage process of the roadside information which a roadside communication apparatus performs.

[Description of Embodiment of the Present Invention]
First, the contents of the embodiment of the present invention will be listed and described.
(1) A storage device according to an embodiment of the present invention is a storage device including a storage unit capable of storing roadside information transmitted from a roadside communication device to an in-vehicle communication device, and collects the roadside information. A collecting unit; and an accumulation processing unit that accumulates only dynamic information from the roadside information collected by the collecting unit in the accumulating unit.
Here, “dynamic information” refers to information whose information content can change from moment to moment.

  According to the storage device configured as described above, the storage processing unit stores only dynamic information from the roadside information collected by the collection unit in the storage unit. Compared with the case where both are stored in the storage unit, the storage capacity of the roadside information stored in the storage unit can be reduced, and a large amount of dynamic information whose information content can change every moment can be stored. it can. Thereby, the effectiveness of the stored information stored in the storage unit can be increased.

(2) In the storage device, it is preferable that the collecting unit collects the roadside information only when the roadside communication device is receiving the vehicle information transmitted by the in-vehicle communication device.
Here, “under reception” by the roadside communication device means that the roadside communication device is included in the communication range of the in-vehicle communication device that transmits the vehicle information.
In this case, dynamic information of roadside information collected only when the roadside communication device is receiving vehicle information is stored in the storage unit. Thereby, when the roadside communication device is not included in the communication range of the in-vehicle communication device, the dynamic information of the roadside information transmitted from the roadside communication device to the in-vehicle communication device is not stored in the storage unit. Therefore, the effectiveness of the stored information stored in the storage unit can be further enhanced.

(3) In the storage device, it is preferable that the collection unit collects the roadside information at a predetermined cycle longer than a transmission cycle of the roadside information by the roadside communication device.
In this case, since the dynamic information of the roadside information collected in a predetermined cycle longer than the transmission cycle of the roadside information by the roadside communication device is stored in the storage unit, the dynamic information of the roadside information collected in each transmission cycle Can be reduced (thinned out) as compared with the case where the information is stored in the storage unit.

(4) In the storage device, the predetermined period is preferably designated by a central device.
In this case, the roadside information collection process can be performed by centralized control from the central device.

(5) In the storage device, the storage processing unit causes the storage unit to store dynamic information of the roadside information collected by the collection unit during reception of the vehicle information by the roadside communication device as a storage unit. Is preferred.
In this case, the dynamic information of the roadside information stored in the storage unit can be used in units of storage.

(6) In the storage device, the storage processing unit stores the dynamic information of the roadside information collected by the collection unit during a predetermined time during the reception of the vehicle information by the roadside communication device as a storage unit. It is preferable to accumulate in the part.
In this case, the dynamic information of the roadside information stored in the storage unit can be used in further subdivided storage units.

(7) In the storage device, the predetermined time is preferably designated by a central device.
In this case, the dynamic information storage unit can be set by centralized control from the central device.

(8) In the storage device, a setting unit that sets a storage priority for each storage unit of the dynamic information stored in the storage unit, and the dynamic information stored in the storage unit exceeds a predetermined capacity And a deletion processing unit for deleting in order from the storage unit having the lowest storage priority.
In this case, when the dynamic information stored in the storage unit exceeds a predetermined capacity, the deletion processing unit deletes the dynamic information with the high storage priority in order from the storage unit with the low storage priority. Can leave. Thereby, the effectiveness of the stored information stored in the storage unit can be further enhanced.

(9) In the storage device of (1) to (7), the collection unit further collects vehicle information transmitted by the in-vehicle communication device, and the accumulation processing unit collects the vehicle information collected by the collection unit. Further, it is preferable to store in the storage unit.
In this case, since the vehicle information is stored in the storage unit in addition to the dynamic information of the roadside information, the effectiveness of the stored information stored in the storage unit can be further enhanced.

(10) In the storage device of (8), the collection unit further collects vehicle information transmitted by the in-vehicle communication device, and the storage processing unit further collects the vehicle information collected by the collection unit. It is preferable to make it accumulate.
In this case, since the vehicle information is stored in the storage unit in addition to the dynamic information of the roadside information, the effectiveness of the stored information stored in the storage unit can be further enhanced.

  (11) A storage device according to an embodiment of the present invention is a storage device including a storage unit capable of storing vehicle information transmitted by an in-vehicle communication device, the collection unit collecting the vehicle information, and the collection unit For each of the vehicle information stored in the storage unit, the storage processing unit that stores the vehicle information transmitted by one in-vehicle communication device as the storage unit in the storage unit, and the vehicle information stored in the storage unit. A setting unit that sets a storage priority based on the content, and a deletion processing unit that sequentially deletes the storage units with a low storage priority when the vehicle information stored in the storage unit exceeds a predetermined capacity; It has.

According to the storage device configured as described above, since the vehicle information transmitted by one in-vehicle communication device is stored in the storage unit as a storage unit, the vehicle information can be used for each in-vehicle communication device.
Further, when the vehicle information stored in the storage unit exceeds a predetermined capacity, the deletion processing unit sequentially deletes the storage units with the low storage priority, so that the vehicle information with a high storage priority may be left in the storage unit. it can. Thereby, the effectiveness of the stored information stored in the storage unit can be increased.

(12) In the storage device, it is preferable that the setting unit sets the storage priority based on vehicle type information included in a storage unit of the vehicle information.
In this case, for example, when the vehicle is a public vehicle such as an emergency vehicle based on the vehicle type information, the vehicle information transmitted by the public vehicle can be preferentially accumulated in the accumulation unit by setting the accumulation priority high. . Thereby, when performing traffic evaluations such as safety and smoothness of public vehicles, it is possible to effectively use the information accumulated with priority.

(13) In the storage device, the setting unit may set the storage priority based on vehicle behavior information included in a storage unit of the vehicle information.
In this case, for example, when the vehicle is running abnormally such as suddenly braking or steering from the behavior information of the vehicle, the vehicle that is running abnormally transmits by setting a high storage priority. It is possible to preferentially store the vehicle information that has been made in the storage unit. Thereby, when conducting an accident investigation, the information accumulated with priority can be effectively used.

(14) In the storage device, the setting unit may set the storage priority based on vehicle position information included in a storage unit of the vehicle information.
In general, a vehicle traveling near an intersection is more likely to cause a traffic accident than a vehicle traveling near an intersection. Therefore, for example, when the vehicle is traveling near an intersection from the position information of the vehicle, by setting the accumulation priority high, the vehicle information transmitted by the vehicle that is likely to cause a traffic accident is stored in the accumulation unit. Priority can be accumulated. Thereby, when conducting an accident investigation, the information accumulated with priority can be effectively used.

(15) In the storage device, the setting unit may set the storage priority based on travel time information of a vehicle included in a storage unit of the vehicle information.
In this case, for example, when the traveling time of the vehicle is close to the current time, the vehicle information transmitted by the vehicle whose traveling time is close to the current time is preferentially stored in the storage unit by setting the storage priority high. Can do. As a result, when the latest traffic evaluation is performed, the information accumulated with priority can be effectively used.

(16) The roadside communication device may include the storage device.
In this case, since the roadside communication device can be used as a storage device, the storage device can be constructed at low cost.

  (17) A computer program according to an embodiment of the present invention is a computer program for causing a computer to function as the storage device of (1). Therefore, the computer program of this embodiment has the same operation and effect as the storage device (1).

  (18) A computer program according to an embodiment of the present invention is a computer program for causing a computer to function as the storage device of (11). Therefore, the computer program of the present embodiment has the same operational effects as the storage device (11).

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
<Overall system configuration>
FIG. 1 is a road plan view of a traffic signal control system according to an embodiment of the present invention.
As shown in FIG. 1, the traffic signal control system of the present embodiment includes a traffic signal controller 1, a signal lamp 2, a roadside communication device 3, a central device 4, an in-vehicle communication device 6 mounted on a vehicle 5, and a roadside sensor. 7 etc. are included.
Note that the number of lanes and the like of the crossroad intersection (hereinafter simply referred to as “intersection”) C shown in FIG. 1 is an example, and the structure of the intersection C is not limited to that shown in FIG.

  The traffic signal controller 1 is connected to a plurality of signal lamps 2 installed at an intersection C through power lines. The traffic signal controller 1 is connected to a central device 4 in the traffic control center via a communication line 8 such as a telephone line. The communication line 8 is made of a metal line, for example. An ISDN (Integrated Services Digital Network) method is adopted as a communication method of a communication device using the communication line 8 as a communication medium.

  The central device 4 constitutes a local area network (LAN) with the traffic signal controller 1 and the roadside communication device 3 at a plurality of intersections C within its own jurisdiction area. Accordingly, the central device 4 can perform bidirectional communication between the traffic signal controller 1 and the roadside communication device 3. Moreover, the traffic signal controller 1 can communicate bidirectionally with the controller 1 at other intersections. The central device 4 may be installed on the road instead of the traffic control center.

The roadside sensor 7 is installed at various locations on the road in the jurisdiction area mainly for the purpose of counting the number of vehicles flowing into the intersection C.
The roadside sensor 7 includes a vehicle detector that senses the vehicle 5 passing directly below with ultrasonic waves, a monitoring camera that captures the traffic situation of the vehicle 5 in time series, and an optical beacon that performs optical communication with the vehicle 5 using near infrared rays. Etc. are included.

  The downlink information that the central device 4 transmits to the communication line 8 includes a signal control command S1, traffic information S2, and the like. The signal control command S <b> 1 is information (for example, cycle start time and step execution seconds) indicating the lamp color switching timing of the signal lamp device 2, and is transmitted to the traffic signal controller 1. The traffic information S2 is, for example, traffic jam information or traffic regulation information, and is transmitted to an optical beacon of the roadside communication device 3 or the roadside sensor 7.

The uplink information received by the central device 4 from the communication line 8 includes control signal execution information S3, vehicle information S4, sensor information S5, and the like.
The control signal execution information S3 is information indicating the performance of the control actually performed by the traffic signal controller 1 in the previous cycle. Therefore, the generation source of the control signal execution information S3 is the traffic signal controller 1.

The vehicle information S4 is information from which the vehicle 5 is generated. The vehicle information S4 includes the vehicle ID of the vehicle 5, vehicle type information, speed information, behavior information, travel time information and position information at the time of information generation, and the like. Therefore, when the position information of a plurality of vehicle information S4 of the same vehicle ID is arranged in time series, it becomes probe information that can specify the traveling locus of the vehicle 5.
The sensor information S5 is information representing a measurement result by the roadside sensor 7, and includes sensor information of a vehicle detector, image data of a monitoring camera, and the like. Therefore, the generation source of the sensor information S5 is the roadside sensor 7.

The roadside communication device 3 is set in the vicinity of the intersection C so as to be able to wirelessly communicate with the vehicle 5 traveling on the road branched from the intersection C. Therefore, the roadside communication device 3 can receive radio waves transmitted by the vehicle 5 that performs vehicle-to-vehicle communication with the vehicle-mounted communication device 6 on the road.
The roadside sensor 7 is communicably connected to the traffic signal controller 1 via a communication line, and the traffic signal controller 1 is communicably connected to the roadside communicator 3 via a communication line. The traffic signal controller 1 may be connected to the central device 4 without passing through the roadside communication device 3.

The traffic signal controller 1 transmits the generated control signal execution information S3 to the roadside communication device 3, and the roadside sensor 7 uplinks the measured sensor information S5 to the roadside communication device 3 via the traffic signal controller 1. Send.
When the roadside communication device 3 receives the control signal execution information S3 and the sensor information S5, the roadside communication device 3 uplink-transmits the information S3 and S5 to the central device 4. Further, when the roadside communication device 3 receives the vehicle information S4, the roadside communication device 3 transmits the vehicle information S4 to the central device 4 in an uplink manner. Furthermore, the roadside communication device 3 transfers the received signal control command S1 to the traffic signal control device 1 when the downlink control information from the central device 4 includes the signal control command S1.

The roadside communication device 3 wirelessly transmits roadside information provided to the vehicle 5 by road-to-vehicle communication. Roadside information can be classified into dynamic information and static information.
The dynamic information includes information whose information content can change from moment to moment, such as traffic information S2 from the central device 4, control signal execution information S3 from the traffic signal controller 1, and sensor information S5 from the roadside sensor 7. Say.
Static information refers to information whose information content does not change in a short period of time, such as road alignment information indicating a road structure and the like, and restriction information indicating the content and period of traffic regulation. That is, the static information is information whose information content varies with time and is less frequently than dynamic information.

<Central device>
The central device 4 has a control device such as a workstation (WS) or a personal computer (PC). This control device comprehensively collects, processes and records various information S1 to S3 transmitted uplink from the roadside communication device 3 in the jurisdiction area, and performs signal control and information provision based on the information S1 to S3. To do.

Specifically, the central device 4 performs “system control” for adjusting a group of traffic signal controllers 1 on the same road with respect to the traffic signal controller 1 at the intersection C belonging to the jurisdiction area, or performs this system control on the road. "Wide area control (plane control)" extended to the network can be performed.
The central device 4 includes a communication device that communicates using the communication line 8. The communication device of the central device 4 executes downlink transmission of the signal control command S1 and traffic information S2, and uplink reception of the control signal execution information S3, vehicle information S4, and sensor information S5.

The control device of the central device 4 can execute the system control and the wide area control using the uplink information transmitted from the roadside communication device 3 at each intersection C.
In addition, the control device of the central device 4 transmits a signal control command S1 in a downlink every calculation cycle (for example, 2.5 minutes) such as system control, and downs the traffic information S2 every predetermined cycle (for example, 5 minutes). Send link.

<Wireless communication methods, etc.>
The ITS wireless system of the present embodiment is a wireless communication system for incorporating vehicle information S4 transmitted and received between vehicles 5 by inter-vehicle communication into the traffic control of the central device 4.
Specifically, the ITS wireless system of the present embodiment wirelessly communicates with a plurality of roadside communication devices 3 capable of wireless communication with the vehicle-mounted communication device 6, and the roadside communication device 3 and other vehicle-mounted communication devices 6 using a carrier sense method. It is equipped with the vehicle-mounted communication apparatus 6 which performs communication.

The roadside communication device 3 is installed at each intersection C, and is attached to, for example, a column of the signal lamp device 2. The in-vehicle communication device 6 is mounted on part or all of the vehicle 5 traveling on the road.
The in-vehicle communication device 6 mounted on the vehicle 5 can receive the transmission radio wave within the reach of the transmission radio wave of the roadside communication device 3. Further, the roadside communication device 3 can receive the transmission radio wave within the reach of the transmission radio wave of the in-vehicle communication device 6.

The combination of communication subjects of the ITS wireless system of the present embodiment includes “vehicle-to-vehicle communication” that is communication between the vehicle-mounted communication devices 6 and “road-to-vehicle communication” that is communication between the roadside communication device 3 and the vehicle-mounted communication device 6. are categorized.
As a multiple access system in which the two types of communication coexist, frequency division multiplexing (FDMA), code division multiple access (CDMA), or the like can be employed.

When the priority of transmission by the roadside communication device 3 is improved, a multi-access scheme following the “700 MHz band intelligent road traffic system standard (ARIB STD-T109)” may be adopted. In this embodiment, it is assumed that this method is adopted.
In the standard multi-access scheme, a dedicated time slot transmitted by the roadside communication device 3 is assigned by a TDMA (Time Division Multiple Access) scheme, and a time slot other than the roadside dedicated time slot is assigned to a CSMA / CA (Carrier Sense Multiple Access). / Collision Avoidance) is a method assigned to vehicle-to-vehicle communication.

According to this method, the roadside communication device 3 does not perform wireless transmission in a time zone other than its own time slot. That is, the time zone other than the time slot of the roadside communication device 3 is opened as a transmission time by the CSMA method for the in-vehicle communication device 6.
Moreover, the roadside communication device 3 acquires information exchanged by the vehicle-to-vehicle communication by receiving the transmission radio wave of the vehicle-to-vehicle communication without negotiating with the vehicle-mounted communication device 6.

By the way, the roadside communication device 3 is a roadside that is transmitted by road-to-vehicle communication in case offline information analysis is performed for purposes such as accident investigation, crime investigation and traffic evaluation (safety and smoothness evaluation). It is expected that a certain amount of information such as information and vehicle information received by inter-vehicle communication will be accumulated.
However, in the roadside communication device 3, since it is necessary to construct a storage medium that is sufficiently reliable under low-temperature outdoor conditions such as temperature and vibration at a low cost, the storage capacity has certain limitations. Therefore, in the present embodiment, accumulation processing is performed to increase the effectiveness of accumulated information accumulated in the roadside communication device 3. Details thereof will be described later.

<Roadside communication device>
FIG. 2 is a block diagram illustrating a configuration of the roadside communication device 3.
The roadside communication device 3 includes a wireless communication unit 31 to which an antenna 30 for wireless communication is connected, a wired communication unit 32 that communicates with the central device 4, a processor (CPU: Central Processing Unit) that performs communication control thereof, and the like And a storage unit (storage unit) 34 including a storage device such as a ROM or a RAM connected to the control unit 33.
The storage unit 34 of the roadside communication device 3 includes, for example, a flash memory, and stores a computer program for communication control executed by the control unit 33, various data received by the wireless communication unit 31 and the wired communication unit 32, and the like. Yes.

The roadside communication device 3 of the present embodiment functions as a storage device that stores vehicle information S4 received by the wireless communication unit 31, roadside information transmitted by the wireless communication unit 31, and the like.
For this reason, the control unit 33 of the roadside communication device 3 includes a collection unit 33A, a setting unit 33B, an accumulation processing unit 33C, and a deletion processing unit 33D as functional units achieved by executing the computer program.

The collection unit 33A collects the vehicle information S4 received by the wireless communication unit 31.
The accumulation processing unit 33C accumulates the vehicle information S4 collected by the collecting unit 33A in the storage unit 34. Specifically, the accumulation processing unit 33C accumulates the vehicle information transmitted by one in-vehicle communication device 6 (one vehicle 5) in the storage unit 34 among the vehicle information S4 collected by the collecting unit 33A. Let

The collection unit 33A also collects roadside information transmitted by the wireless communication unit 31. Specifically, the collection unit 33A collects roadside information based on a predetermined period designated by the central device 4 only when the wireless communication unit 31 is receiving the vehicle information S4. Here, “under reception” means that the roadside communication device 3 is included in the communication range of the in-vehicle communication device 6 that transmits vehicle information.
The predetermined cycle is set to a cycle (for example, 1 second) longer than a transmission cycle (for example, 100 ms) of roadside information by the wireless communication unit 31. Thereby, the collection of roadside information by the collection unit 33A can be reduced (thinned out).

  The accumulation processing unit 33C causes the storage unit 34 to accumulate only dynamic information from the roadside information collected by the collection unit 33A. At that time, when the wireless communication unit 31 continuously receives the vehicle information S4, the accumulation processing unit 33C collects the collection unit 33A during a predetermined time (for example, 5 minutes) designated by the central device 4 during the reception. Is stored in the storage unit 34 as a storage unit.

<Setting storage priority>
When the vehicle information S4 is accumulated in the storage unit 34, the setting unit 33B sets the accumulation priority for each accumulation unit of the vehicle information S4. The accumulation priority of this embodiment is set by the number of points and a weighting coefficient, for example. Specifically, the setting unit 33B sets the number of accumulation priority points and the weighting coefficient based on the vehicle type information, behavior information, position information, travel time information, and the like of the vehicle 5 included in the accumulation unit (vehicle information S4). A value obtained by multiplying the determined number of points by a weighting coefficient is set as an accumulation priority.

The setting unit 33B of the present embodiment sets the accumulation priority of the vehicle information S4 as follows, for example.
Based on the vehicle type information included in the vehicle information S4, the setting unit 33B can effectively use the vehicle information S4 during traffic evaluation when the vehicle 5 is a public vehicle such as an emergency vehicle. .
In addition, when the vehicle 5 is other than a public vehicle based on the vehicle type information, the setting unit 33B can use the vehicle information S4 more effectively as the positioning information of the position information included in the vehicle information S4 is higher. The higher the height, the higher the number of points.

  Based on the behavior information included in the vehicle information S4, the setting unit 33B effectively uses the vehicle information S4 when investigating an accident when the vehicle 5 is running abnormally, such as suddenly braking or steering. As the level of abnormal driving is higher, the number of points is set higher. When the abnormal running occurs a plurality of times, the setting unit 33B updates the number of points by multiplying the set number of points by the number of occurrences of the abnormal running.

  There are six types of abnormal driving, for example, “abnormal high speed driving”, “abnormal low speed driving”, “abnormal speed increase”, “abnormal speed decrease”, “abnormal direction change”, and “abnormal situation occurrence”. The simple contents for each type and the reasons why the type can be used effectively are listed below.

1) Abnormally high-speed running: An event in which the vehicle 5 is abnormally faster than the speed of other vehicles. For example, when such a vehicle 5 is located behind another vehicle on an expressway, there is a possibility of causing an accident in which the vehicle 5 collides with another vehicle.
2) Abnormally low speed travel: An event in which the vehicle 5 is abnormally slow in speed than the speed of other vehicles. For example, if such a vehicle 5 is in front of another vehicle on a highway, the other vehicle may collide with the vehicle 5.

3) Abnormal speed increase: An event in which the vehicle 5 suddenly accelerates with an abnormally large acceleration. This is because such a vehicle 5 has a high possibility of causing an accident.
4) Abnormal speed decrease: An event in which the vehicle 5 suddenly decelerates with an abnormally large deceleration. This is because such a vehicle 5 is considered to be sudden braking by an obstacle or braking that may induce an accident.

5) Abnormal direction change: An event in which the vehicle 5 changes its traveling direction at an abnormally high speed. This is because such other vehicle 5 can be estimated to have suddenly turned off as an obstacle avoidance behavior, and it is easy to induce an accident of the following vehicle.
6) Occurrence of an abnormal situation: An event in which system information indicating an abnormal state of the vehicle 5 is acquired or vehicle information of the vehicle 5 is not normal but lost. This is because such a vehicle 5 is considered to have stopped due to an emergency information transmission or stopped due to an accident.
Note that the types of abnormal running listed above are merely examples, and can be changed as appropriate according to road traffic conditions and the like.

  In addition, the setting unit 33B can effectively use the vehicle information S4 at the time of the accident investigation even when the vehicle 5 is traveling exceeding the speed limit based on the behavior information included in the vehicle information S4. The higher the value of, the higher the number of points.

  Based on the position information included in the vehicle information S4, the setting unit 33B sets a high weighting factor when the vehicle 5 is traveling from a predetermined position on the inflow path of the intersection C to a predetermined position on the outflow portion of the intersection C. However, when the vehicle 5 is traveling in another range, the weighting coefficient is set low. The reason for setting in this way is that a vehicle traveling in the vicinity of an intersection is generally more likely to cause a traffic accident than a vehicle traveling in the vicinity of the intersection, and the vehicle information S4 can be used effectively during an accident investigation. It is.

  Based on the travel time information included in the vehicle information S4, the setting unit 33B sets the weighting coefficient high when the travel time of the vehicle 5 is close to the current time, and when the travel time of the vehicle 5 is far from the current time. Set the weighting factor low. The reason for this setting is that the vehicle information S4 can be used more effectively when the latest traffic evaluation is performed as the traveling time of the vehicle 5 is closer to the current time. The weighting coefficient based on the travel time information is updated and set every predetermined time.

  As described above, the setting unit 33B sums the set points and weighting coefficients based on the plurality of pieces of information included in the vehicle information S4. And the setting part 33B can calculate the accumulation | storage priority of each accumulation | storage unit of vehicle information S4 by multiplying the total value of a weighting coefficient by the total value of the number of points.

The storage processing unit 33C stores the number of points set based on each information set by the setting unit 33B, the weighting coefficient, and the storage priority calculated from them together with the storage unit of the corresponding vehicle information S4 as a search key. The data is accumulated in the unit 34.
Further, the accumulation processing unit 33C causes the storage unit 34 to accumulate at least one information such as a vehicle ID and vehicle type information in the vehicle information S4 as a search key together with a corresponding accumulation unit of the vehicle information S4.

Thereby, the control part 33 of the roadside communication apparatus 3 can transmit applicable vehicle information S4 to the central apparatus 4 rapidly, if the predetermined | prescribed search condition using the said search key is received from the central apparatus 4. FIG.
In addition, although the accumulation priority of this embodiment is set using the number of points and the weighting coefficient, it may be set using only one of these. The setting unit 33B sets the accumulation priority using the vehicle type information, behavior information, position information, and travel time information included in the vehicle information S4. At least one of these pieces of information is used. That's fine. In addition, the setting unit 33B may set the accumulation priority using other information included in the vehicle information S4.

The setting unit 33B also sets the storage priority for each dynamic information storage unit even when the dynamic information of the roadside information is stored in the storage unit 34. The setting unit 33B of the present embodiment sets the storage priority of the dynamic information storage unit based on the storage priority of the vehicle information S4.
Specifically, the setting unit 33B prioritizes the accumulation of the vehicle information S4 of all the vehicles 5 that have been provided with roadside information during the predetermined time during which the collection unit 33A collects the dynamic information accumulation unit. The total value of degrees is set as the accumulation priority of the dynamic information accumulation unit.
As described above, when the accumulation priority of the dynamic information of the roadside information is matched with the accumulation priority of the related vehicle information S4, the deletion processing unit 33D deletes information in order from the low accumulation priority as will be described later. In addition, it is possible to prevent only one of the dynamic information of the roadside information and the vehicle information S4 related to each other from being deleted.

When the dynamic information of the vehicle information S4 and roadside information accumulated in the storage unit 34 exceeds a predetermined capacity, the deletion processing unit 33D deletes the storage unit 34 in order from the accumulation unit having the lowest accumulation priority.
The setting unit 33B can set a deletion prohibition period (for example, one month) for prohibiting deletion of the storage unit from the storage unit 34 for each storage unit of the vehicle information S4 and the dynamic information. For this reason, the storage unit 34 is separately provided with a storage area for storing the storage unit in which the deletion prohibition period is set.
When the storage capacity of the storage area that stores the storage unit for which the deletion prohibition period is set is exceeded, the deletion processing unit 33D has the lowest storage priority among the storage units stored in the storage area. Are deleted from the storage unit 34 in order.

<Vehicle information accumulation process>
FIG. 3 is a flowchart showing the contents of the storage process of the vehicle information S4 executed by the control unit 33 of the roadside communication device 3.
In the roadside communication device 3, when the wireless communication unit 31 receives the vehicle information S4 (step S1), the control unit 33 determines that the vehicle 5 that is the transmission source of the vehicle information S4 is located within a predetermined geographical range including the intersection C. It is determined whether or not to perform (step S2). This determination is performed to exclude (thin out) the vehicle information S4 received from outside the geographical range in the collection unit 33A from the collection target, and is determined based on position information included in the vehicle information S4. Can do.

If the determination result of step S2 is negative, the control unit 33 ends the process.
When the determination result of step S2 is affirmative, the control unit 33 collects the vehicle information S4 by the collection unit 33A (step S3).

  Next, the control unit 33 sets the vehicle information S4 collected from one vehicle 5 by the accumulation processing unit 33C as an accumulation unit (step S4). Then, the control unit 33 sets the storage priority for each storage unit by the setting unit 33B according to the method described above (step S5).

  Next, the control unit 33 causes the storage processing unit 33C to store the storage unit of the vehicle information S4 in the storage unit 34 together with the corresponding storage priority and search key (step S6). Then, the control unit 33 determines whether the storage capacity of the storage unit 34 exceeds a predetermined capacity by the deletion processing unit 33D (step S7).

If the determination result of step S7 is negative, the control unit 33 ends the process.
When the determination result of step S7 is affirmative, the control unit 33 selects the storage unit having the lowest storage priority among the plurality of storage units of the vehicle information S4 stored in the storage unit 34 by the deletion processing unit 33D. Extract and delete (step S8). And the control part 33 repeats step S7 and step S8 until the accumulation capacity of the memory | storage part 34 becomes below predetermined capacity by the deletion process part 33D.

<Accumulation processing of roadside information (dynamic information)>
FIG. 4 is a flowchart showing the contents of the roadside information (dynamic information) accumulation process executed by the control unit 33 of the roadside communication device 3.
In the roadside communication device 3, when the wireless communication unit 31 receives the vehicle information S4 (step S21), the control unit 33 determines that the vehicle 5 that is the transmission source of the vehicle information S4 is located within a predetermined geographical range including the intersection C. It is determined whether or not to perform (step S22). This determination is performed to exclude (thin out) roadside information provided by road-to-vehicle communication from the collection target while the collection unit 33A receives the vehicle information S4 from outside the geographical range. . This determination can be made based on the position information included in the vehicle information S4.

When the determination result of step S22 is negative, the control unit 33 ends the process.
When the determination result of step S22 is affirmative, the control unit 33 collects roadside information transmitted by the wireless communication unit 31 by the collection unit 33A (step S23). At this time, the collection unit 33A collects the roadside information at a predetermined cycle longer than the transmission cycle of the roadside information by the wireless communication unit 31, so that the collected data amount of the roadside information can be reduced (thinned out).

Next, the control unit 33 determines whether or not a predetermined time has elapsed by the accumulation processing unit 33C (step S24).
When the determination result of step S24 is negative, the control unit 33 returns to step S23.
When the determination result in step S24 is affirmative, the control unit 33 sets, as an accumulation unit, a value obtained by extracting only dynamic information from the roadside information collected within the predetermined time by the accumulation processing unit 33C (step S25). . Then, the control unit 33 sets the storage priority for each storage unit by the setting unit 33B according to the method described above (step S26).

  Next, the control unit 33 causes the storage processing unit 33C to store the storage unit of the dynamic information in the storage unit 34 together with the corresponding storage priority and search key (step S27). Then, the control unit 33 determines whether the storage capacity of the storage unit 34 exceeds a predetermined capacity by the deletion processing unit 33D (step S28).

  When the determination result of step S28 is negative, the control unit 33 determines whether or not the wireless communication unit 31 has finished receiving the vehicle information S4 in the collection unit 33A (step S29). This determination can determine, for example, the time when the wireless communication unit 31 stops receiving the vehicle information S4 as the reception end time of the vehicle information S4.

When the determination result of step S29 is affirmative, the control unit 33 ends the process.
When the determination result of step S29 is negative, the control unit 33 returns to step S23 and collects new roadside information.

  On the other hand, when the determination result of step S28 is affirmative, the control unit 33 has the lowest accumulation priority among the plurality of accumulation units of the dynamic information accumulated in the storage unit 34 by the deletion processing unit 33D. The storage unit is extracted and deleted (step S30). Then, the control unit 33 repeatedly performs step S28 and step S30 until the deletion processing unit 33D causes the storage capacity of the storage unit 34 to be equal to or less than a predetermined capacity.

<About effects>
As described above, according to the present embodiment, the accumulation processing unit 33C in the control unit 33 of the roadside communication device 3 causes the storage unit 34 to accumulate only dynamic information from the roadside information collected by the collection unit 33A. For this reason, compared with the case where static information and dynamic information of roadside information are stored in the storage unit 34, the storage capacity of the roadside information stored in the storage unit 34 can be reduced, and the information is constantly updated. A large amount of dynamic information whose contents can change can be accumulated. Thereby, the effectiveness of the stored information stored in the storage unit 34 can be increased.

  Further, since the collecting unit 33A collects roadside information only when the roadside communication device 3 is receiving the vehicle information S4 transmitted by the in-vehicle communication device 6, the movement of the roadside information collected only during the reception is collected. Target information is stored in the storage unit 34. Thereby, when the roadside communication device 3 is not included in the communication range of the in-vehicle communication device 6, the dynamic information of the roadside information transmitted from the roadside communication device 3 is not accumulated in the storage unit 34. The effectiveness of the stored information stored in the unit 34 can be further increased.

Further, since the collection unit 33A collects roadside information at a predetermined cycle longer than the transmission cycle of roadside information by the roadside communication device 3, only the dynamic information of the roadside information collected at the predetermined cycle is stored in the storage unit 34. Is done. Thereby, compared with the case where the dynamic information of the roadside information collected for each transmission cycle is accumulated in the storage unit 34, the accumulated information accumulated in the storage unit 34 can be reduced (thinned out).
Further, since the central unit 4 designates the predetermined period in which the collecting unit 33A collects the roadside information, the roadside information collecting process can be performed by centralized control from the central device 4.

  The accumulation processing unit 33C accumulates the dynamic information of the roadside information collected by the collection unit 33A during the reception of the vehicle information S4 by the roadside communication device 3 in the storage unit 34 as an accumulation unit. Dynamic information of roadside information can be used in storage units.

Further, the accumulation processing unit 33C accumulates the dynamic information of the roadside information collected by the collection unit 33A during the predetermined time during the reception of the vehicle information S4 by the roadside communication device 3 in the storage unit 34 as the accumulation unit. The dynamic information of the roadside information stored in the unit 34 can be used in further subdivided storage units.
Moreover, since the central device 4 designates the predetermined time, the dynamic information storage unit can be set by centralized control from the central device 4.

  Further, when the dynamic information of the roadside information accumulated in the storage unit 34 exceeds a predetermined capacity, the deletion processing unit 33D deletes the storage unit 34 in order from the storage unit having the lowest storage priority. It is possible to leave dynamic information having a high accumulation priority. Thereby, the effectiveness of the accumulated information accumulated in the storage unit 34 can be further enhanced.

Further, since the accumulation processing unit 33C accumulates the vehicle information S4 in the storage unit 34 in addition to the dynamic information of the roadside information, it is possible to further increase the effectiveness of the accumulation information accumulated in the storage unit 34.
Further, since the vehicle information S4 transmitted by one vehicle 5 (one in-vehicle communication device 6) is stored in the storage unit 34 as an accumulation unit, the vehicle information can be used for each vehicle 5.

  When the vehicle information S4 stored in the storage unit 34 exceeds a predetermined capacity, the deletion processing unit 33D deletes the storage unit 34 in order from the storage unit having the lowest storage priority. High vehicle information S4 can be left. Thereby, the effectiveness of the stored information stored in the storage unit 34 can be increased.

  Moreover, since the setting part 33B sets the accumulation priority high when the vehicle 5 is a public vehicle such as an emergency vehicle from the vehicle type information included in the vehicle information S4, the vehicle information S4 transmitted by the public vehicle is stored in the storage unit. 34 can be preferentially stored. Thereby, when performing traffic evaluations such as safety and smoothness of public vehicles, it is possible to effectively use the information accumulated with priority.

  Further, the setting unit 33B sets the accumulation priority high when the vehicle 5 is running abnormally, such as sudden braking or sudden steering, from the behavior information of the vehicle 5 included in the vehicle information S4. The vehicle information S4 transmitted by the abnormally traveling vehicle 5 can be preferentially accumulated in the storage unit 34. Thereby, when conducting an accident investigation, the information accumulated with priority can be effectively used.

  In general, a vehicle traveling near the intersection is more likely to cause a traffic accident than a vehicle traveling near the intersection. For this reason, the setting unit 33B sets the accumulation priority high when the vehicle 5 is traveling near the intersection C from the position information of the vehicle 5 included in the vehicle information S4. Thereby, the vehicle information S4 transmitted by the vehicle 5 having a high possibility of causing a traffic accident can be preferentially accumulated in the storage unit 34. Thereby, when conducting an accident investigation, the information accumulated with priority can be effectively used.

In addition, the setting unit 33B sets a high storage priority when the traveling time of the vehicle 5 is close to the current time based on the traveling time information included in the vehicle information S4, so that the vehicle 5 whose traveling time is close to the current time is set. The transmitted vehicle information S4 can be accumulated in the storage unit 34 with priority. As a result, when the latest traffic evaluation is performed, the information accumulated with priority can be effectively used.
Further, since the roadside communication device 3 is used as a storage device, the storage device can be constructed at a low cost.

<Other variations>
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.
For example, in the above embodiment, the roadside communication device 3 is used as a storage device, but a storage device may be provided separately from the roadside communication device 3. Moreover, in the said embodiment, although both roadside information (dynamic information) and vehicle information S4 are accumulate | stored, you may accumulate | store only any one.

DESCRIPTION OF SYMBOLS 1 Traffic signal controller 2 Signal lamp 3 Roadside communication apparatus 4 Central apparatus 5 Vehicle 6 Car-mounted communication apparatus 7 Roadside sensor 8 Communication line 30 Antenna 31 Wireless communication part 32 Wired communication part 33 Control part 33A Collection part 33B Setting part 33C Accumulation process part 33D Deletion processing unit 34 Storage unit (storage unit)
C intersection S1 signal control command S2 traffic information S3 control signal execution information S4 vehicle information S5 sensor information

Claims (18)

A storage device including a storage unit capable of storing roadside information transmitted from a roadside communication device to an in-vehicle communication device,
A collection unit for collecting the roadside information;
A storage processing unit that stores only dynamic information in the storage unit from the roadside information collected by the collection unit;   The storage device according to claim 1, wherein the collection unit collects the roadside information only when the roadside communication device is receiving the vehicle information transmitted by the in-vehicle communication device.   The storage device according to claim 1, wherein the collection unit collects the roadside information at a predetermined cycle longer than a transmission cycle of the roadside information by the roadside communication device.   The storage device according to claim 3, wherein the predetermined period is designated by a central device.   The storage device according to claim 2, wherein the storage processing unit causes the storage unit to store dynamic information of the roadside information collected by the collection unit during reception of the vehicle information by the roadside communication device as a storage unit.   The accumulation processing unit accumulates the dynamic information of the roadside information collected by the collection unit during a predetermined time during reception of the vehicle information by the roadside communication device in the accumulation unit as a storage unit. The storage device described.   The storage device according to claim 6, wherein the predetermined time is designated by a central device. A setting unit for setting a storage priority for each storage unit of the dynamic information stored in the storage unit;
8. The deletion processing unit according to claim 1, further comprising: a deletion processing unit that deletes the dynamic information stored in the storage unit in order from the storage unit having the lowest storage priority when the dynamic information exceeds a predetermined capacity. The storage device according to claim 1. The collection unit further collects vehicle information transmitted by the in-vehicle communication device,
The storage device according to claim 1, wherein the storage processing unit further stores the vehicle information collected by the collection unit in the storage unit. The collection unit further collects vehicle information transmitted by the in-vehicle communication device,
The accumulation apparatus according to claim 8, wherein the accumulation processing unit further accumulates the vehicle information collected by the collection unit in the accumulation unit. A storage device including a storage unit capable of storing vehicle information transmitted by an in-vehicle communication device,
A collection unit for collecting the vehicle information;
An accumulation processing unit for accumulating vehicle information transmitted by one in-vehicle communication device as an accumulation unit in the accumulation unit among the vehicle information collected by the collection unit;
For each storage unit of the vehicle information stored in the storage unit, a setting unit that sets a storage priority based on the content thereof;
And a deletion processing unit that deletes the vehicle information stored in the storage unit in order from the storage unit having the lowest storage priority when the vehicle information exceeds a predetermined capacity.   The storage device according to claim 10 or 11, wherein the setting unit sets the storage priority based on vehicle type information included in a storage unit of the vehicle information.   The storage device according to claim 10 or 11, wherein the setting unit sets the storage priority based on vehicle behavior information included in a storage unit of the vehicle information.   The storage device according to claim 10 or 11, wherein the setting unit sets the storage priority based on vehicle position information included in a storage unit of the vehicle information.   The storage device according to claim 10 or 11, wherein the setting unit sets the storage priority based on travel time information of a vehicle included in the storage unit of the vehicle information.   The storage device according to any one of claims 1 to 15, wherein the roadside communication device includes the storage device. A computer program for causing a computer to execute processing for storing roadside information transmitted from a roadside communication device toward an in-vehicle communication device in a storage unit,
Computer
A collection unit for collecting the roadside information;
A computer program for functioning as an accumulation processing unit for accumulating only dynamic information in the accumulation unit from the roadside information collected by the collection unit. A computer program for causing a computer to execute processing for storing vehicle information transmitted by an in-vehicle communication device in a storage unit,
Computer
A collection unit for collecting the vehicle information;
An accumulation processing unit for accumulating vehicle information transmitted by one in-vehicle communication device as an accumulation unit in the accumulation unit among the vehicle information collected by the collection unit;
For each storage unit of the vehicle information stored in the storage unit, a setting unit that sets a storage priority based on the content thereof;
When the vehicle information stored in the storage unit exceeds a predetermined capacity, a computer program for functioning as a deletion processing unit that sequentially deletes the storage units having a low storage priority.

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