JP2016218590A - Line aggregation device, central device, traffic control system, traffic control method, and program - Google Patents

Abstract

A traffic signal controller is operated in a desired state. A communication unit that exchanges communication data with a plurality of terminal devices and with a central device and exchanges communication data with other line aggregation devices, and controls the communication unit And a control unit that relays communication data exchanged between the plurality of terminal devices and the central device, and the control unit cannot communicate between the line aggregation device and the central device, and (i) When communication is possible between another line aggregation device and the central device, communication data is relayed via the other line aggregation device, and (ii) between the line aggregation device and the central device and other line aggregation. Subordinate traffic signal control connected to the line aggregating device based on information from one of the plurality of terminal devices when communication cannot be performed between the device and the central device Signal control command to control the machine Determining the distribution, to control under the traffic signal controller based on the determined signal control command information. [Selection] Figure 2

Description

  The present invention relates to a line aggregation device, a central device, a traffic control system, a traffic control method, and a program, and more particularly, a line used when communication data is exchanged between a central device and a terminal device via the line aggregation device. The present invention relates to an aggregation device, a central device, a traffic control system, a traffic control method, and a program.

  2. Description of the Related Art Conventionally, a traffic control system for controlling a traffic signal controller or providing vehicle information via an optical beacon by collecting, analyzing and transmitting information related to road traffic is known. In the traffic control system, a network system using IP (Internet Protocol) in a network layer of a so-called OSI reference model as a communication procedure has become widespread.

  Such a network system is standardized as a UD transmission system. In a network system employing a UD type transmission system, communication is exchanged between a central device installed in a traffic control center and a plurality of terminal devices including a traffic signal controller installed on the road or on the road side. As a device for relaying data, for example, a UD terminal line aggregation device has been standardized.

  Patent Document 1 discloses a UD terminal line aggregation device that relays communication data by bypassing another communication line even when a certain communication line is disconnected due to an accident or the like.

JP 2008-70996 A

  However, the conventional line aggregating apparatus does not provide for a case where communication data cannot be relayed by bypassing another communication line. In such a case, the traffic signal controller cannot receive the signal control command information from the central device, and it becomes difficult to operate the traffic signal controller in a desired state when traffic congestion occurs.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a line aggregation device and the like that can operate a traffic signal controller in a desired state.

  (1) In order to achieve the above object, a circuit aggregation device according to an embodiment of the present invention includes a plurality of terminal devices including a traffic signal controller installed on a road or on a road side, and a center installed in a traffic control center. A line aggregation device that relays communication data exchanged with a device through an aggregation line laid between the central device and the plurality of terminal devices and between the central device A communication unit that exchanges the communication data and exchanges the communication data with another line aggregation device that can communicate with the line aggregation device; and A control unit that relays the communication data exchanged between the terminal device and the central device, and the control unit (i) cannot communicate between the line aggregation device and the central device. And the other times When the first condition that communication can be performed between the aggregation device and the central device is satisfied, the communication data is relayed via the other line aggregation device; (ii) the line aggregation device and the central device; And any one of the plurality of terminal devices when the second condition that communication cannot be performed between the other line aggregation device and the central device is satisfied. Signal control command information for controlling a subordinate traffic signal controller connected to the line aggregating device is determined based on the information, and the subordinate traffic signal controller is determined based on the determined signal control command information. Control.

  (10) A central device according to another embodiment of the present invention is connected to a line aggregation device via an aggregation line and includes a plurality of terminal devices including a traffic signal controller installed on or on the roadside. A central device installed at a traffic control center for exchanging communication data via the line aggregation device between the plurality of terminal devices via the line aggregation device And a control unit that exchanges the communication data with the plurality of terminal devices via the line aggregation device by controlling the communication unit, the control unit, When communication is not possible with the line aggregating apparatus and communication is possible with another line aggregating apparatus capable of communicating with the line aggregating apparatus, the line aggregating apparatus is communicated with the line aggregating apparatus via the other line aggregating apparatus. Communication between To exchange chromatography data.

  (12) A traffic control system according to another embodiment of the present invention includes a central device installed in a traffic control center, a plurality of terminal devices including a traffic signal controller installed on the road or on the road side, and the central device. A line aggregation device that relays communication data exchanged with the central device through an aggregation line laid between the central device and the line aggregation device. A communication unit that exchanges the communication data with a device and exchanges the communication data with another line aggregation device capable of communicating with the line aggregation device; and controls the communication unit A control unit that relays the communication data exchanged between the plurality of terminal devices and the central device, wherein the control unit is configured to: (i) between the line aggregation device and the central device. In communication And relaying the communication data via the other line aggregation device when the first condition that communication is possible between the other line aggregation device and the central device is satisfied, and (ii) the line When the second condition that communication cannot be performed between the aggregation device and the central device and between the other line aggregation device and the central device is connected to the line aggregation device. Signal control command information for controlling the subordinate traffic signal controller is determined, and the subordinate traffic signal controller is controlled based on the determined signal control command information.

  (13) A traffic control method according to another embodiment of the present invention is an exchange between a plurality of terminal devices including a traffic signal controller installed on or on the road and a central device installed in a traffic control center. Is a traffic control method by a line aggregation device that relays communication data to be transmitted through an aggregation line laid between the central device, the communication cannot be performed between the line aggregation device and the central device, and Relaying the communication data via the other line aggregation device when communication is possible between the other line aggregation device and the central device that can communicate with the line aggregation device; When communication cannot be performed between the aggregation device and the central device and between the other line aggregation device and the central device, any one of the plurality of terminal devices Signal control command information for controlling a subordinate traffic signal controller connected to the line aggregation device is determined based on information from the device, and the subordinate traffic signal control is determined based on the determined signal control command information Controlling the machine.

  (14) A program according to another embodiment of the present invention is exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and a central device installed in the traffic control center. A program for causing a computer to function as a line aggregation device that relays communication data through an aggregation line laid between the central device and the plurality of terminal devices and between the central device A communication unit that exchanges the communication data and exchanges the communication data with another line aggregation device that can communicate with the line aggregation device; and The computer functions as a control unit that relays the communication data exchanged between the terminal device and the central device, and the control unit includes: (i) the line aggregation device and the When the first condition that communication cannot be performed with a central device and communication between the other line aggregation device and the central device is satisfied, the communication data is transmitted via the other line aggregation device. (Ii) The second condition that communication cannot be performed between the line aggregation device and the central device and between the other line aggregation device and the central device is satisfied. And determining signal control command information for controlling a traffic signal controller under control connected to the line aggregation device based on information from any one of the plurality of terminal devices. The subordinate traffic signal controller is controlled based on the signal control command information.

  The present invention can also be realized as a semiconductor integrated circuit that realizes part or all of the line aggregation device or the central device.

  According to the present invention, the traffic signal controller can be operated in a desired state.

It is a figure showing the schematic structure of the traffic control system concerning an embodiment of the invention. It is a figure which shows the structure of a center apparatus and a line aggregation apparatus. It is a figure which shows the flow of communication data when an aggregation line is normal and communication can be performed between a central apparatus and a line aggregation apparatus. It is a figure which shows the flow of communication data when a part of aggregation line is abnormal. It is a figure which shows the priority regarding a bandwidth. It is a figure which shows the flow of communication data when all the integrated lines are abnormal. It is a figure which shows the flow of communication data when an aggregation line is restored. It is a flowchart which shows the flow of the process which a line aggregation apparatus performs. It is a flowchart which shows the flow of the process which a line aggregation apparatus performs. It is a figure which shows the priority of communication data. It is a flowchart which shows the flow of the process which a central apparatus performs.

  First, embodiments of the present invention will be listed and described.

  (1) A line aggregation device according to an embodiment of the present invention is exchanged between a plurality of terminal devices including a traffic signal controller installed on a road or on a road side and a central device installed in a traffic control center. A line aggregation device that relays communication data through an aggregation line laid between the central device and the communication data between the plurality of terminal devices and the central device. A communication unit that exchanges the communication data with another line aggregation device that can communicate with the line aggregation device; and the communication unit to control the plurality of terminal devices and the central device; A control unit that relays the communication data exchanged between the communication unit, the control unit (i) cannot communicate between the line aggregation device and the central device, and the other line aggregation device And the central device The communication data is relayed through the other line aggregation device when the first condition that communication is possible between the line aggregation device and (ii) the line aggregation device and the central device, and the other line When the second condition that communication cannot be performed between the aggregation device and the central device is satisfied, the line aggregation is performed based on information from any one of the plurality of terminal devices. Signal control command information for controlling a subordinate traffic signal controller connected to the apparatus is determined, and the subordinate traffic signal controller is controlled based on the determined signal control command information.

  According to this configuration, even when the second condition is satisfied, that is, even when communication data cannot be relayed between the central device and the terminal device even through another line aggregation device, the vehicle detector The line aggregation device determines signal control command information for controlling the traffic signal controller using such information. For example, when a traffic jam is detected based on information from the vehicle detector, signal control command information that can eliminate the traffic jam can be created. For this reason, even if it is a case where communication data cannot be relayed also via another communication line, a traffic signal controller can be operated in a desirable state.

  (2) When the second condition is satisfied, the control unit further controls the communication unit to obtain data used for controlling a traffic signal controller subordinate to the other line aggregation device. The traffic signal controller subordinate to the line aggregation device may be controlled based on the received data received from another line aggregation device.

  According to this configuration, when the second condition is satisfied, the signal control command information of the traffic signal controller subordinate to the other line aggregation device is acquired, or the vehicle sensor information subordinate to the other line aggregation device is acquired. You can do it. For this reason, for example, the control unit can determine the signal control command information of the traffic signal controller under the line aggregation device so that the offset is synchronized with the traffic signal controller under the other line aggregation device. . As a result, signal control command information that eliminates traffic congestion can be created, and the traffic signal controller can be operated in a desired state.

  (3) The control unit includes the communication data, the signal control command information of the traffic signal controller transmitted from the central device, and the sensing information of the vehicle traveling on the road transmitted from the terminal device. May be relayed with priority.

  According to this configuration, it is possible to relay the signal control command information and the sensing information important for the control of the traffic signal controller with priority over other information. As a result, the traffic signal controller can be controlled with as little trouble as possible, and the traffic signal controller can be operated in a desired state.

  (4) The control unit relays the signal control command information with higher priority than when relaying the signal control command information to a predetermined first time period as compared to when relaying to a time period other than the first time period. May be.

  According to this configuration, for example, by setting a time zone with a high traffic volume, such as during morning and evening rush hours, as the first time zone, the traffic signal controller can be controlled without causing any trouble as long as the traffic volume is high. be able to. Therefore, the traffic signal controller can be operated in a desired state.

  (5) The line aggregation device can communicate with a plurality of other line aggregation devices, and the control unit, based on the priority regarding the bandwidth of the other line aggregation device, when the first condition is satisfied. It is also possible to select at least one of the other line aggregation devices and relay the communication data via the selected other line aggregation device.

  According to this configuration, communication data can be relayed via another line aggregation device having a sufficient bandwidth. For this reason, communication data is not routed to another line aggregation device having no bandwidth, and communication data can be relayed while minimizing the influence on communication of the other line aggregation device.

  (6) The line aggregation device can communicate with a plurality of other line aggregation devices, and the control unit, based on a priority regarding the bandwidth of the other line aggregation device, when the first condition is satisfied. Determining a distribution rate of communication data to the plurality of other line aggregation devices, distributing the communication data to the plurality of other line aggregation devices according to the determined distribution rate, and a plurality of the other line aggregation devices The communication data may be relayed through.

  According to this configuration, communication data can be distributed according to the size of the bandwidth and relayed via a plurality of other line aggregation devices. For this reason, it is possible to relay communication data with a larger amount of data as other line aggregation devices with sufficient bandwidth and reduce the data amount of communication data relayed by other line aggregation devices with less bandwidth. it can. Therefore, communication data can be relayed while minimizing the influence on communication of other line aggregation devices.

  (7) The priority may be determined according to the type and number of subordinate terminal devices connected to each of the other line aggregation devices.

  According to this configuration, the terminal device that communicates a large amount of data is connected to other line aggregation devices that are connected to many terminal devices, or communication data is not transmitted at all. Large communication data can be prevented from being transmitted. Therefore, communication data can be relayed while minimizing the influence on communication of other line aggregation devices.

  (8) The line aggregation device further includes a storage unit that stores signal control execution information indicating an execution result of the traffic signal controller under the line aggregation device, and the control unit includes the line aggregation device and the line aggregation device. When the communication with the central device is not possible, the signal control execution information is stored in the storage unit, and when the communication between the line aggregation device and the central device is restored, the signal control execution information is stored in the storage unit. The signal control execution information may be transmitted to the central device.

  According to this configuration, the signal control execution information that could not be transmitted in real time can be subsequently transmitted to the central apparatus. For this reason, in the central apparatus, the signal control execution information can be used for various statistical processes.

  (9) The control unit, when the communication unit has not received the communication data from the central device via the other line aggregation device for a predetermined time, It may be determined that communication cannot be performed between a device and the central device.

  According to this configuration, it is possible to determine whether or not communication can be performed between another line aggregation device and the central device by a simple method.

  (10) A central device according to another embodiment of the present invention is connected to a line aggregation device via an aggregation line and includes a plurality of terminal devices including a traffic signal controller installed on or on the roadside. A central device installed at a traffic control center for exchanging communication data via the line aggregation device between the plurality of terminal devices via the line aggregation device And a control unit that exchanges the communication data with the plurality of terminal devices via the line aggregation device by controlling the communication unit, the control unit, When communication is not possible with the line aggregating apparatus and communication is possible with another line aggregating apparatus capable of communicating with the line aggregating apparatus, the line aggregating apparatus is communicated with the line aggregating apparatus via the other line aggregating apparatus. Communication between To exchange chromatography data.

  According to this configuration, even when communication data cannot be exchanged with a plurality of terminal devices via the line aggregation device, communication data can be exchanged via another line aggregation device. it can. For this reason, the signal control command information of the traffic signal controller and the information of the vehicle detector can be exchanged, and the traffic signal controller can be operated in a desired state.

  (11) When the control unit can communicate with the line aggregation device and does not communicate with the line aggregation device when corresponding to a predetermined second time zone. You may acquire the signal control execution information which shows the execution result of the traffic signal controller under control of the said line aggregation apparatus accumulate | stored from the said line aggregation apparatus.

  According to this configuration, a time zone with low traffic volume such as midnight is set as the second time zone to avoid a time zone where the bandwidth of the aggregated line is not sufficient, such as during morning and evening rush hours, and the signal from the line aggregator Control execution information can be acquired. For this reason, signal control execution information can be acquired without disturbing communication of important information, such as signal control command information of a traffic signal controller.

  (12) A traffic control system according to another embodiment of the present invention includes a central device installed in a traffic control center, a plurality of terminal devices including a traffic signal controller installed on the road or on the road side, and the central device. A line aggregation device that relays communication data exchanged with the central device through an aggregation line laid between the central device and the line aggregation device. A communication unit that exchanges the communication data with a device and exchanges the communication data with another line aggregation device capable of communicating with the line aggregation device; and controls the communication unit A control unit that relays the communication data exchanged between the plurality of terminal devices and the central device, wherein the control unit is configured to: (i) between the line aggregation device and the central device. In communication And relaying the communication data via the other line aggregation device when the first condition that communication is possible between the other line aggregation device and the central device is satisfied, and (ii) the line When the second condition that communication cannot be performed between the aggregation device and the central device and between the other line aggregation device and the central device is connected to the line aggregation device. Signal control command information for controlling the subordinate traffic signal controller is determined, and the subordinate traffic signal controller is controlled based on the determined signal control command information.

  According to this configuration, the same configuration as the line aggregation device shown in (1) is provided. For this reason, the same operation and effect as the line aggregation device shown in (1) can be obtained.

  (13) A traffic control method according to another embodiment of the present invention is an exchange between a plurality of terminal devices including a traffic signal controller installed on or on the road and a central device installed in a traffic control center. Is a traffic control method by a line aggregation device that relays communication data to be transmitted through an aggregation line laid between the central device, the communication cannot be performed between the line aggregation device and the central device, and Relaying the communication data via the other line aggregation device when communication is possible between the other line aggregation device and the central device that can communicate with the line aggregation device; When communication cannot be performed between the aggregation device and the central device and between the other line aggregation device and the central device, any one of the plurality of terminal devices Signal control command information for controlling a subordinate traffic signal controller connected to the line aggregation device is determined based on information from the device, and the subordinate traffic signal control is determined based on the determined signal control command information Controlling the machine.

  According to this configuration, processing corresponding to the line aggregation device shown in (1) is executed. For this reason, the same operation and effect as the line aggregation device shown in (1) can be obtained.

  (14) A program according to another embodiment of the present invention is exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and a central device installed in the traffic control center. A program for causing a computer to function as a line aggregation device that relays communication data through an aggregation line laid between the central device and the plurality of terminal devices and between the central device A communication unit that exchanges the communication data and exchanges the communication data with another line aggregation device that can communicate with the line aggregation device; and The computer functions as a control unit that relays the communication data exchanged between the terminal device and the central device, and the control unit includes: (i) the line aggregation device and the When the first condition that communication cannot be performed with a central device and communication between the other line aggregation device and the central device is satisfied, the communication data is transmitted via the other line aggregation device. (Ii) The second condition that communication cannot be performed between the line aggregation device and the central device and between the other line aggregation device and the central device is satisfied. And determining signal control command information for controlling a traffic signal controller under control connected to the line aggregation device based on information from any one of the plurality of terminal devices. The subordinate traffic signal controller is controlled based on the signal control command information.

  According to this configuration, the same configuration as the line aggregation device shown in (1) is provided. For this reason, the same operation and effect as the line aggregation device shown in (1) can be obtained.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. The invention is specified by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.
In addition, you may combine arbitrarily at least one part of embodiment described below.

(Embodiment)
[1. Overall configuration of traffic control system]
FIG. 1 is a diagram showing a schematic configuration of a traffic control system according to an embodiment of the present invention.
The traffic control system 1 is a system for integrally issuing instructions such as operation of traffic lights or provision of information to the vehicle 60 by collecting, analyzing and transmitting information related to road traffic. The traffic control system 1 includes a central device 10, a line aggregation device 20, a traffic signal controller 31, an ultrasonic vehicle sensor 32, an optical beacon 33, an image vehicle detector 34, and an aggregation line 40. The terminal line 50 is provided.

  The central device 10 is a computer provided in a traffic control center and is connected to a line aggregation device 20 (to be described later) via an aggregation line 40. The aggregated line 40 is laid between the line aggregating apparatus 20 and the central apparatus 10 and is configured by a wired or wireless analog line or a digital line such as a wide area Ethernet (“Ethernet” is a registered trademark).

  The central device 10 exchanges communication data with terminal devices such as a traffic signal controller 31, an ultrasonic vehicle detector 32, an optical beacon 33, and an image type vehicle detector 34 via an aggregation line 40, thereby controlling traffic signals. Information for controlling the machine 31 (hereinafter referred to as “signal control command information”) is transmitted to the traffic signal controller 31. For example, the central device 10 changes the split based on the vehicle sensing information acquired from the ultrasonic vehicle sensor 32 or the image-type vehicle sensor 34 so that the green signal of a road on which a traffic jam occurs becomes longer. Is transmitted to the traffic signal controller 31. The signal control command information includes information such as split, offset, and cycle length.

  In addition, the central device 10 sends information to the vehicle 60 via the optical beacon 33 such as traffic information (hereinafter referred to as “optical beacon provision information”) to the optical beacon 33 via the line aggregation device 20, The ID (identifier) information of the vehicle 60 (hereinafter referred to as “vehicle ID information”) can be received from the optical beacon 33 via the line aggregation device 20.

  The line aggregation device 20 is installed on or on the road side such as the road R, and relays communication data exchanged between a plurality of terminal devices including the traffic signal controller 31 and the central device 10 through the aggregation line 40. The line aggregation device 20 is installed at each major intersection, for example, and is connected to a plurality of terminal devices installed at the intersection and a plurality of terminal devices installed at intersections near the intersection.

  The terminal device is installed on the road such as the road R or on the road side. The terminal device includes a traffic signal controller 31, an ultrasonic vehicle sensor 32, an optical beacon 33, an image vehicle detector 34, and the like. Each terminal device is connected to the line aggregation device 20 via a terminal line 50. The terminal line 50 is a self-employed line composed of a metal line or the like.

  The traffic signal controller 31 controls the lamp color of the signal lamp based on the signal control command information including the control parameter transmitted from the central device 10. The data of the timetable which is the execution result of the traffic signal controller 31 is transmitted to the central apparatus 10 via the line aggregation apparatus 20 as signal control execution information.

  The ultrasonic vehicle sensor 32 is a sensor that senses the vehicle 60 by projecting an ultrasonic beam onto the road surface and detecting the interruption of the sound wave or beam reflected from the vehicle 60. The ultrasonic vehicle sensor 32 transmits the sensing result as sensing information to the central device 10 via the line aggregation device 20.

  The optical beacon 33 is a device for performing two-way communication with the vehicle 60 by near-infrared communication. The optical beacon 33 transmits the optical beacon provision information received from the central device 10 to the vehicle 60 or the vehicle 60 The ID information is received, and the received vehicle ID information is sent to the central device 10 via the line aggregation device 20.

  The image-type vehicle detector 34 senses a vehicle by imaging a vehicle traveling on the road R with a camera unit installed on the road side, and processes the obtained image, and detects the vehicle speed, vehicle type, and the like. Or measure. The image-type vehicle detector 34 transmits the sensing result or the measurement result as sensing information to the central device 10 via the line aggregation device 20.

[2. Configuration of Central Device 10 and Line Aggregation Device 20]
FIG. 2 is a diagram illustrating the configuration of the central device 10 and the line aggregation device 20.
The central device 10 includes a communication unit 11 and a control unit 12.
The communication unit 11 is connected to the line aggregation device 20 via the aggregation line 40, and exchanges communication data with a plurality of terminal devices 30 via the line aggregation device 20. That is, the communication unit 11 includes a communication interface that transmits and receives communication data. 2 includes a traffic signal controller 31, an ultrasonic vehicle detector 32, an optical beacon 33, and an image vehicle detector 34. The terminal device 30 shown in FIG.

The control unit 12 controls the communication unit 11 to exchange communication data with a plurality of terminal devices 30 via the line aggregation device 20. That is, the control unit 12 controls the communication unit 11 to transmit communication data to the terminal device 30, and receives communication data transmitted from the terminal device 30 to the line aggregation device 20 from the line aggregation device 20.
The line aggregation device 20 includes a communication unit 21, a control unit 22, and a storage unit 23.

  The communication unit 21 is connected to the plurality of terminal devices 30 via the terminal line 50, and exchanges communication data with the plurality of terminal devices 30. In addition, the communication unit 21 is connected to the central apparatus 10 via the aggregation line 40 and exchanges communication data with the central apparatus 10.

  The communication unit 21 communicates with the line aggregation apparatuses 20A and 20B, which are line aggregation apparatuses that can communicate with the line aggregation apparatus 20, and exchanges communication data. The line aggregating apparatus 20 and the line aggregating apparatus 20A or the line aggregating apparatus 20B may be connected by a wired private line such as a metal line, or may be connected by a wireless LAN (Local Area Network). That is, the communication unit 21 includes a communication interface that transmits and receives communication data. The line aggregation devices 20A and 20B have the same configuration as the line aggregation device 20. The line aggregation devices 20A and 20B are, for example, line aggregation devices respectively installed at positions closest to the intersection where the line aggregation device 20 is installed. However, the installation positions of the line aggregation apparatuses 20A and 20B are not limited, and may be installed at any position as long as communication with the line aggregation apparatus 20 is possible.

  The control unit 22 relays communication data exchanged between the plurality of terminal devices 30 and the central device 10 by controlling the communication unit 21. That is, the control unit 22 controls the communication unit 21 to transmit the communication data received by the communication unit 21 from the central device 10 to the terminal device 30. Further, the control unit 22 controls the communication unit 21 to transmit communication data received by the communication unit 21 from the terminal device 30 to the central device 10.

  The storage unit 23 is a storage unit that stores communication data received from terminal information, and specifically stores signal control execution information, sensing information, and vehicle ID information.

[3. Processing by Traffic Control System 1]
[3-1. Normal operation]
FIG. 3 is a diagram showing a flow of communication data when the aggregation line 40 is normal and communication can be performed between the central apparatus 10 and the line aggregation apparatus 20.

  As shown in FIG. 3, when the central line 40 that connects the central device 10 and the line aggregation device 20 is normal, the central device 10 sends signal control command information and Transmit optical beacon provision information. The line aggregation device 20 receives the signal control command information and the optical beacon provision information from the central device 10 via the aggregation line 40.

  The line aggregation device 20 transmits the received signal control command information to the subordinate traffic signal controller 31 connected to the line aggregation device 20. The traffic signal controller 31 controls the light color of the signal lamp device based on the signal control command information.

  In addition, the line aggregation device 20 transmits the received optical beacon provision information to the subordinate optical beacon 33 connected to the line aggregation device 20. The optical beacon 33 transmits the optical beacon provision information to the vehicle 60 traveling on the road R.

  The line aggregation device 20 also receives signal control execution information, sensing information, and vehicle ID information from the traffic signal controller 31, the ultrasonic vehicle detector 32, and the optical beacon 33, respectively, via the terminal line 50. The line aggregation device 20 transmits the received information to the central device 10 via the aggregation line 40.

[3-2. When some aggregate lines are abnormal]
FIG. 4 is a diagram illustrating a flow of communication data when some of the aggregated lines are abnormal. The case where some of the aggregated lines are abnormal means that the aggregated line 40 is abnormal due to disconnection or the like, and communication between the central apparatus 10 and the line aggregated apparatus 20 cannot be performed. This indicates a case where the aggregated line 40A connecting 20A and the central apparatus 10 or the aggregated line 40B connecting the line aggregated apparatus 20B and the central apparatus 10 is normal.

  In this case, the central device 10 cannot transmit communication data to the line aggregation device 20 via the aggregation line 40. Therefore, the central device 10 transmits communication data to the line aggregation device 20 via another line aggregation device 20 that can communicate with the line aggregation device 20. For example, the central device 10 selects the line aggregation device 20A among the line aggregation devices 20A and 20B based on the priority related to the bandwidth described later, and sends a line as a transmission destination address to the selected line aggregation device 20A. Communication data including the IP address of the aggregation device 20 is transmitted. The line aggregation device 20A receives the communication data and transfers the communication data to the line aggregation device 20 according to the transmission destination address included in the received communication data. Thereby, the line aggregation device 20 can receive the signal control command information and the optical beacon provision information from the central device 10 via the line aggregation device 20A.

  In addition, the line aggregation device 20 cannot transmit communication data to the central device 10 via the aggregation line 40. Therefore, the line aggregation device 20 transmits communication data to the central device 10 via the line aggregation device 20A or 20B. For example, the line aggregating apparatus 20 selects the line aggregating apparatus 20A from the line aggregating apparatuses 20A and 20B based on the priority related to the bandwidth described later, and transmits communication data to the central apparatus 10 via the selected line aggregating apparatus 20A. Send. That is, the line aggregation device 20 transmits communication data including the IP address of the central device 10 as a transmission destination address to the line aggregation device 20A. The line aggregation device 20A transfers the communication data to the central device 10 in accordance with the transmission destination address included in the received communication data. As a result, the line aggregating apparatus 20 sends communication data such as signal control execution information, sensing information, and vehicle ID information received from the terminal apparatus 30 under the line aggregating apparatus 20 to the central apparatus 10 via the line aggregating apparatus 20A. Can be sent.

  Here, priority regarding the bandwidth will be described. FIG. 5 is a diagram illustrating the priority related to the bandwidth.

  Similarly to the line aggregation device 20, the line aggregation devices 20 </ b> A and 20 </ b> B perform transmission / reception of communication data with the central device 10. For this reason, the central apparatus 10 communicates communication data via the one having a sufficient bandwidth (the one with the higher communication speed) among the line aggregation apparatuses 20A and 20B so that the communication between the line aggregation apparatuses 20A and 20B is not hindered as much as possible. Needs to be transmitted to the line aggregation device 20. When the aggregated line 40A and the aggregated line 40B are lines having the same bandwidth, the bandwidth margin can be estimated based on the types and the number of terminal devices 30 subordinate to the line aggregating apparatus 20A and the line aggregating apparatus 20B. it can.

  For example, when the traffic of the traffic signal controller 31 is “1”, the ultrasonic vehicle detector 32, the optical beacon 33, and the image vehicle detector 34 are “1”, “3”, and “3”, respectively. 10 "traffic volume. Since the traffic aggregation controller 20 is connected with three traffic signal controllers 31, two ultrasonic vehicle detectors 32, and one optical beacon 33, the traffic volume is "8". Can be estimated.

  Since the two traffic signal controllers 31, four ultrasonic vehicle detectors 32, and one optical beacon 33 are connected to the line aggregation device 20A, the traffic volume is "9". Can be estimated. Since the two traffic signal controllers 31, two ultrasonic vehicle detectors 32, and one image type vehicle detector 34 are connected to the line aggregation device 20B, the communication amount can be reduced. “14” can be estimated.

  FIG. 5 shows the priorities determined in ascending order of traffic. For this reason, the central apparatus 10 selects the line aggregation apparatus 20A having a higher priority (small value) from the line aggregation apparatus 20A and the line aggregation apparatus 20B, and the line aggregation apparatus 20 via the selected line aggregation apparatus 20A. Send communication data to. Similarly, the line aggregation device 20 selects the line aggregation device 20A according to the priority, and transmits communication data to the central device 10 via the selected line aggregation device 20A. The central device 10 may update the table data shown in FIG. 5 periodically (for example, once a day) and distribute it to the line aggregation device 20.

[3-3. When all aggregated lines are abnormal]
FIG. 6 is a diagram showing a flow of communication data when all the aggregated lines are abnormal. The case where all the aggregated lines are abnormal indicates a case where all of the aggregated line 40, aggregated line 40A, and aggregated line 40B are abnormal due to disconnection or the like. That is, communication cannot be performed between the line aggregation device 20 and the central device 10, and communication is performed between each of the line aggregation devices 20A and 20B that can communicate with the line aggregation device 20 and the central device 10. Indicates a case where it cannot be performed.

  In this case, there is no communication path connecting the line aggregation device 20 and the central device 10 within one hop. Therefore, the line aggregation device 20 determines signal control command information for controlling the subordinate traffic signal controller 31 and transmits the determined signal control command information to the traffic signal controller 31 subordinate to the line aggregation device 20. By doing so, the traffic signal controller 31 is controlled. For example, the line aggregation device 20 communicates with the line aggregation device 20B and receives the signal control command information of the line aggregation device 20B. The line aggregation device 20 determines the signal control command information so that the offset is synchronized with the traffic signal controller 31 subordinate to the line aggregation device 20B. Thereby, the timing of a green signal can be synchronized between adjacent intersections, and traffic can be facilitated.

  The line aggregation device 20 determines the signal control command information of the traffic signal controller 31 based on the sensing information collected from the subordinate ultrasonic vehicle detector 32, the optical beacon 33, the image type vehicle detector 34, or the like. May be.

  Further, the line aggregation device 20 accumulates the information by writing the signal control execution information, the sensing information, and the vehicle ID information in the storage unit 23.

[3-4. When aggregated line 40 is restored]
FIG. 7 is a diagram showing a flow of communication data when the aggregated line 40 is restored. When the aggregation line 40 is restored and communication between the central apparatus 10 and the line aggregation apparatus 20 becomes possible, the line aggregation apparatus 20 stores the signal control execution information stored in the storage unit 23 of the line aggregation apparatus 20. The sensing information and the vehicle ID information are sequentially transmitted to the central device 10.

[4. Processing flow of line aggregation device 20]
8 and 9 are flowcharts showing the flow of processing executed by the line aggregation device 20.

  The line aggregation device 20 determines whether or not communication with the central device 10 is normally performed (S2). For example, the control unit 22 determines whether or not communication with the central apparatus 10 is normally performed based on the presence / absence of a connection error such as a TCP / IP (Transmission Control Protocol / Internet Protocol) socket error. To do.

  When communication with the central device 10 is normally performed (YES in S2), the line aggregation device 20 is connected between the central device 10 and another line aggregation device that can communicate with the line aggregation device 20. It is determined whether or not exchanged communication data is received (S4). Here, the line aggregation device 20 </ b> A and the line aggregation device 20 </ b> B can communicate with the line aggregation device 20. Whether or not the communication data is exchanged between the central device 10 and another line aggregation device can be determined from the transmission destination address and the transmission source address. When the line aggregation device 20 receives communication data exchanged between the central device 10 and another line aggregation device, the aggregated line between the other line aggregation device and the central device 10 is abnormal. Is the case.

  When communication data exchanged between the central device 10 and another line aggregation device is received (YES in S4), the control unit 22 of the line aggregation device 20 sets the received communication data as a priority. It relays accordingly (S6). For example, the priority of communication data is determined as shown in FIG. The lower the value, the higher the priority, and the `` signal control command information '' transmitted during peak hours such as during morning and evening rush hours has the highest priority, and is transmitted during off-peak hours, which are other time zones. “Signal control command information” and “sense information” have the next highest priority. The controller 22 preferentially relays information with high priority according to this priority.

  The control unit 22 of the line aggregation device 20 relays communication data exchanged between the central device 10 and the terminal devices connected to the line aggregation device 20 (S8). Then, it returns to step S2.

  When communication data exchanged between the central apparatus 10 and another line aggregation apparatus has not been received (NO in S4), the control unit 22 of the line aggregation apparatus 20 has not transmitted to the central apparatus 10. It is determined whether data is stored in the storage unit 23 (S10). If no data is stored in the storage unit 23 (NO in S10), the process proceeds to step S8.

  If data is stored in the storage unit 23 (YES in S10), the control unit 22 determines whether or not it is a time zone in which the data stored in the storage unit 23 can be transmitted to the central device 10 (S12). ). The data stored in the storage unit 23 is preferably sent when there is a sufficient bandwidth. For this reason, for example, it is desirable to send it at midnight. If the accumulated data is not in a transmittable time zone (NO in S12), the process proceeds to step S8.

  If it is a time zone in which the accumulated data can be transmitted (YES in S12), the control unit 22 has data to be transmitted / received between the central device 10 and the terminal device 30 with priority over the accumulated data. It is determined whether or not (S14). For example, if the communication unit 21 receives information with a priority of 1 or 2 in FIG. 10, it may be determined that there is communication data to be transmitted / received with priority.

  If there is communication data to be preferentially transmitted (YES in S14), the control unit 22 relays the communication data (S8).

  If there is no communication data to be preferentially transmitted (NO in S14), the control unit 22 transmits the data stored in the storage unit 23 to the central device 10 (S16). Then, it returns to step S2.

  If communication with the central device 10 is not normally performed (NO in S2), referring to FIG. 9, the control unit 22 determines whether communication with another line aggregation device can be performed normally. Is determined (S18). For example, based on whether or not a connection error such as a TCP / IP socket error has occurred, it is determined whether or not communication with another line aggregation device is normally performed.

  If communication with another line aggregation device is normal (YES in S18), the control unit 22 is transmitted from the central device 10 to the terminal device 30 under the line aggregation device 20 via the other line aggregation device. It is determined whether communication data is received (S20). For example, the control unit 22 has not received the communication data when the communication unit 21 has not received communication data from the central device 10 via another line aggregation device for a predetermined time. You may judge. That is, it may be determined that communication cannot be performed between another line aggregation device and the central device 10. The predetermined time may be, for example, a time of 5 minutes or the like, or may be one cycle length of the traffic signal controller 31.

  When communication data exchanged between the central device 10 and the terminal device 30 under the line aggregation device 20 is received from another line aggregation device (YES in S20), as shown in FIG. This is a case where some of the aggregated lines are abnormal. For this reason, in such a case, the control unit 22 sends the communication data received from another line aggregation device (line aggregation device 20A in FIG. 4), that is, the communication data transmitted from the central device 10 to the terminal device 30. Transmit (S22). For example, the control unit 22 transmits signal control command information to the traffic signal controller 31. Further, the control unit 22 transmits the optical beacon provision information to the optical beacon 33.

  Further, the control unit 22 transmits the communication data received from the terminal device 30 to the central device 10 via another line aggregation device, or writes the communication data in the storage unit 23 (S24). Whether to transmit to the central apparatus 10 or write to the storage unit 23 is determined based on the priority and history accumulation information for each information type shown in FIG. For example, the control unit 22 transmits information having a priority “1” or “2” in the communication data received from the terminal device 30 to the central device 10 via another line aggregation device. Here, sensing information is transmitted to the central device 10. In addition, the control unit 22 accumulates information in the history accumulation information that is circled and not transmitted to the central apparatus 10 in the storage unit 23. Here, the signal control execution information and the vehicle ID information are accumulated in the storage unit 23. Then, it returns to step S2.

  When communication data exchanged between the central device 10 and the terminal device 30 under the line aggregation device 20 is not received from another line aggregation device (NO in S20), as shown in FIG. This is a case where all the aggregated lines are abnormal. For this reason, in such a case, the control unit 22 collects the sensing information from the ultrasonic vehicle sensor 32, the optical beacon 33, or the image type vehicle sensor 34 under the line aggregation device 20, and collects other information. Sensing information is collected from the line aggregation device. The control unit 22 determines signal control command information of the traffic signal controller 31 connected to the line aggregation device 20 based on the collected sensing information, and transmits the determined signal control command information to the traffic signal controller 31. Thus, the traffic signal controller 31 is controlled (S26).

  The control unit 22 accumulates information such as signal control execution information collected from the subordinate terminal device 30 in the storage unit 23 (S28). Then, it returns to step S2.

  If communication with another line aggregation device is abnormal (NO in S18), information cannot be acquired from the other line aggregation device. For this reason, the control unit 22 collects the sensing information from the ultrasonic vehicle sensor 32, the optical beacon 33 or the image type vehicle sensor 34 under the line aggregation device 20, and collects the line based on the collected sensing information. The signal control command information of the traffic signal controller 31 connected to the device 20 is determined. The control unit 22 controls the traffic signal controller 31 by transmitting the determined signal control command information to the traffic signal controller 31 (S30). Thereafter, the process proceeds to step S28.

[5. Processing flow of central device 10]
FIG. 11 is a flowchart showing a flow of processing executed by the central apparatus 10. The central device 10 executes the processing described below for each line aggregation device 20.

  The control unit 12 of the central device 10 determines whether or not the communication with the focused line aggregation device 20 is normal (S32). As described above, whether or not communication is normal may be determined based on whether or not a connection error has occurred.

  If communication with the line aggregation device 20 is normal (YES in S32), it is determined whether there is data stored in the line aggregation device 20 when communication between the central device 10 and the line aggregation device 20 is abnormal. (S34). For example, if signal control execution information after a certain time is missing, it may be determined that there is data stored in the line aggregation device 20.

  When there is data stored in the line aggregation device 20 (YES in S34), the control unit 12 determines whether or not it is a time zone in which the stored data can be received (S36). For example, if the current time is included in the midnight time zone, which is a time zone in which the bandwidth of the aggregated line 40 has a margin, the control unit 12 determines that the stored data can be received. May be.

  If it is a time zone in which the stored data can be received (YES in S36), the control unit 12 determines whether there is data to be transmitted to the line aggregation device 20 (S38).

  If there is no data to be transmitted to line aggregation device 20 (NO in S38), control unit 12 transmits transmission request information for requesting transmission of data stored in storage unit 23 to line aggregation device 20. (S40). The control unit 22 of the line aggregation device 20 can transmit the data stored in the storage unit 23 to the central device 10 in response to the transmission request information. After step S40, the process returns to step S32.

  When there is no data stored in the line aggregation device 20 (NO in S34), when it is not in a time zone in which the stored data can be received (NO in S36), or when there is data to be transmitted to the line aggregation device 20 The control unit 12 transmits communication data such as signal control command information to the central apparatus 10 (S42). Thereafter, the process returns to step S32.

  If communication with the line aggregation device 20 is abnormal (NO in S32), it is determined whether or not communication with another line aggregation device capable of communicating with the line aggregation device 20 is normal (S44). This determination is made in the same manner as the determination of whether or not the communication with the line aggregation device 20 is normal.

  If communication with another line aggregation device is normal (YES in S44), the control unit 12 transmits communication data such as signal control command information for the line aggregation device 20 to the other line aggregation device. (S46). When there are a plurality of other line aggregation apparatuses, the control unit 12 selects another line aggregation apparatus according to the priority related to the bandwidth shown in FIG. 5, and transmits communication data to the selected other line aggregation apparatus. . Thereafter, the process returns to step S32.

  If communication with another line aggregation device is abnormal (NO in S44), the process returns to step S32 and waits until communication with the line aggregation device or another line aggregation device becomes normal.

[6. Effects of embodiment, etc.]
As described above, according to the traffic control system 1 according to the embodiment of the present invention, the line aggregation device 20A is connected to the central device 10 via the line aggregation device 20A or the line aggregation device 20B, which is another line aggregation device. Even when the communication data exchanged with the terminal device 30 under the line aggregation device 20 cannot be relayed, the line aggregation device 20 is not limited to the ultrasonic vehicle sensor 32 or the image type vehicle sensor. Signal control command information for controlling the traffic signal controller 31 can be determined using information of the vehicle sensor such as 34. For example, when a traffic jam is detected based on information from the ultrasonic vehicle sensor 32, signal control command information that can eliminate the traffic jam can be created. For this reason, the traffic signal controller 31 can be operated in a desirable state even when communication data cannot be relayed through other communication lines such as the aggregated line 40A and the aggregated line 40B.

  In addition, when communication cannot be performed between the line aggregation device 20 and the central device 10 and between any other line aggregation device and the central device 10, the line aggregation device 20 determines that other line aggregation is performed. The signal control command information of the traffic signal controller 31 under the device can be acquired, or the information of the vehicle detector under the control of another line aggregation device can be acquired. For this reason, for example, the control unit 22 determines the signal control command information of the traffic signal controller 31 under the line aggregation device so that the offset is synchronized with the traffic signal controller 31 under the other line aggregation device. be able to. Thereby, signal control command information that eliminates traffic jams can be created, and the traffic signal controller 31 can be operated in a desired state.

  In addition, as described in step S6 of FIG. 8, signal control command information and sensing information important for control of the traffic signal controller 31 can be relayed with priority over other information. Thereby, the traffic signal controller 31 can be controlled as much as possible without causing trouble, and the traffic signal controller 31 can be operated in a desired state.

  Also, when signal control command information is relayed during heavy traffic hours, such as during morning and evening rush hours, signal control command information is relayed more preferentially than when relaying during other time zones. I am doing so. For this reason, it is possible to control the traffic signal controller 31 with as little trouble as possible in a time zone with a large amount of traffic. Therefore, the traffic signal controller 31 can be operated in a desired state.

  Further, when communication with the central device 10 is not possible, the line aggregation device 20 selects and selects one of a plurality of other line aggregation devices based on the bandwidth priority of the other line aggregation devices. The communication data is relayed through the other line aggregation device. For this reason, communication data can be relayed via another line aggregation device with a sufficient bandwidth. Therefore, the communication data is not routed to other line aggregation apparatuses having no bandwidth, and the communication data can be relayed while minimizing the influence on the communication of the other line aggregation apparatuses.

  Also, the priority related to the bandwidth is determined according to the type and number of subordinate terminal devices connected to other line aggregation devices. For this reason, communication data is not transmitted at all to other line aggregation devices that are connected to a terminal device that communicates a large amount of data or to which many terminal devices are connected. You can avoid sending data. Therefore, communication data can be relayed while minimizing the influence on communication of other line aggregation devices.

  In addition, the line aggregation device 20 includes a storage unit 23 that stores signal control execution information of the traffic signal controller 31 under the line aggregation device 20. When the communication between the line aggregation device 20 and the central device 10 cannot be performed, the control unit 22 accumulates the signal control execution information in the storage unit 23 and the communication between the line aggregation device 20 and the central device 10 is restored. In this case, the signal control execution information accumulated in the storage unit 23 is transmitted to the central device 10. For this reason, the signal control execution information that could not be transmitted in real time can be transmitted to the central apparatus 10 afterwards. For this reason, in the central apparatus 10, signal control execution information can be used for various statistical processes.

  In addition, as described in step S20 of FIG. 9, the control unit 22 communicates with other line aggregation devices when the communication unit 21 has not received communication data from the central device 10 for a predetermined time. It is determined that communication with the central apparatus 10 cannot be performed. Therefore, the above determination can be made by a simple method.

  Even if the central device 10 cannot exchange communication data with the plurality of terminal devices 30 via the line aggregation device 20, the central device 10 exchanges communication data via other line aggregation devices. It can be performed. For this reason, the signal control command information of the traffic signal controller 31, the information of the vehicle detector, etc. can be exchanged, and the traffic signal controller 31 can be operated in a desired state.

  In addition, the control unit 12 can communicate with the line aggregation device 20 when it can communicate with the line aggregation device 20 and falls into a time zone in which the bandwidth of the aggregation line has a margin such as midnight. The signal control execution information of the traffic signal controller 31 subordinate to the line aggregation device 20 accumulated while communication is not possible is acquired from the line aggregation device 20. Therefore, signal control execution information can be acquired from the line aggregation device 20 while avoiding a time zone in which the bandwidth is not sufficient, such as during morning and evening rush hours. For this reason, signal control execution information can be acquired without interfering with communication of important information such as signal control command information of the traffic signal controller 31.

[7. Addendum]
The traffic control system 1 according to the embodiment of the present invention has been described above, but the present invention is not limited to this embodiment.
(Modification)

  For example, in the above-described embodiment, when the line aggregation device 20 cannot communicate with the central device 10, the line aggregation device 20 is based on the priority regarding the bandwidth of the other line aggregation devices. One is selected, and communication data is relayed through the selected other line aggregation device. On the other hand, in such a case, a plurality of line aggregation devices may be selected instead of selecting one. For example, the control unit 22 of the line aggregation device 20 may select both the line aggregation devices 20A and 20B, which are other line aggregation devices, and relay the communication data via each other line aggregation device.

  At that time, the control unit 22 determines a distribution ratio of communication data to a plurality of other line aggregation apparatuses based on the priority related to the bandwidth of the other line aggregation apparatuses. The control unit 22 distributes the communication data to a plurality of other line aggregation devices according to the determined distribution rate, and relays the communication data via the plurality of other line aggregation devices. For example, in the priority related to the bandwidth shown in FIG. 5, the priority of the line aggregation device 20A is “2”, and the priority of the line aggregation device 20B is “3”. For this reason, the distribution ratio is determined so that more communication data is distributed to the line aggregation apparatus 20A having a higher priority than the line aggregation apparatus 20B having a lower priority. For example, the communication data distribution rate of the line aggregation device 20A may be “14”, and the communication data distribution rate of the line aggregation device 20B may be “9”. This is because the ratio of the communication amount between the line aggregation device 20A and the line aggregation device 20B is “9:14”, and the distribution ratio is “14: 9”, which is the inverse ratio.

  In this way, communication data with a larger amount of data is relayed as other line aggregation devices with sufficient bandwidth, and the amount of communication data relayed by other line aggregation devices with less bandwidth is reduced. Can do. Therefore, communication data can be relayed while minimizing the influence on communication of other line aggregation devices.

  Each of the above devices may be specifically configured as a computer system including a microprocessor, a ROM, a RAM, a hard disk drive, a display unit, a keyboard, a mouse, and the like. A computer program is stored in the RAM or hard disk drive. Each device achieves its functions by the microprocessor operating according to the computer program. Here, the computer program is configured by combining a plurality of instruction codes indicating instructions for the computer in order to achieve a predetermined function.

  Furthermore, some or all of the constituent elements constituting each of the above-described devices may be configured by one system LSI (Large Scale Integration). The system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on a single chip, and specifically, a computer system including a microprocessor, ROM, RAM, and the like. . A computer program is stored in the RAM. The system LSI achieves its functions by the microprocessor operating according to the computer program.

  Furthermore, some or all of the constituent elements constituting each of the above-described devices may be configured from an IC card that can be attached to and detached from each device or a single module. The IC card or module is a computer system that includes a microprocessor, ROM, RAM, and the like. The IC card or the module may include the super multifunctional LSI described above. The IC card or the module achieves its function by the microprocessor operating according to the computer program. This IC card or this module may have tamper resistance.

  Further, the present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer, or may be a digital signal composed of the computer program.

  Furthermore, the present invention provides a non-transitory recording medium that can read the computer program or the digital signal, such as a flexible disk, a hard disk drive, a CD-ROM, an MO, a DVD, a DVD-ROM, a DVD-RAM, and a BD. (Blu-ray (registered trademark) Disc), or recorded in a semiconductor memory or the like. Further, the digital signal may be recorded on these non-temporary recording media.

  In the present invention, the computer program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.

  The present invention may be a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.

Further, by recording the program or the digital signal on the non-temporary recording medium and transferring it, or transferring the program or the digital signal via the network or the like, another independent computer It may be implemented by the system.
Furthermore, the above embodiment and the above modification examples may be combined.

  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.

DESCRIPTION OF SYMBOLS 1 Traffic control system 10 Central apparatus 11 Communication part 12 Control part 20 Line aggregation apparatus 20A Line aggregation apparatus 20B Line aggregation apparatus 21 Communication part 22 Control part 23 Memory | storage part 30 Terminal device 31 Traffic signal controller 32 Ultrasonic vehicle detector 33 Optical beacon 34 Image-type vehicle detector 40 Aggregated line 40A Aggregated line 40B Aggregated line 50 Terminal line 60 Vehicle R Road

Claims (14)

A communication line that is exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and a central device installed in a traffic control center, and is laid between the central devices. A line aggregation device that relays through
The communication data is exchanged with the plurality of terminal devices and with the central device, and the communication data is exchanged with other line aggregation devices that can communicate with the line aggregation device. A communication unit to perform,
A control unit that relays the communication data exchanged between the plurality of terminal devices and the central device by controlling the communication unit;
The control unit satisfies the first condition that (i) communication cannot be performed between the line aggregation device and the central device, and communication can be performed between the other line aggregation device and the central device. Relaying the communication data via the other line aggregating apparatus, and (ii) either between the line aggregating apparatus and the central apparatus or between the other line aggregating apparatus and the central apparatus A subordinate traffic signal controller connected to the line aggregation device based on information from any one of the plurality of terminal devices when the second condition that communication cannot be performed is satisfied. A line aggregation device that determines signal control command information for control, and controls the subordinate traffic signal controllers based on the determined signal control command information. When the second condition is satisfied, the control unit further controls the communication unit so that data used for control of the traffic signal controller under the other line aggregation device is transferred to the other line. The line aggregation device according to claim 1, wherein the line aggregation device controls the traffic signal controller under the line aggregation device based on the data received from the aggregation device. The control unit prioritizes the signal control command information of the traffic signal controller transmitted from the central device and the sensing information of the vehicle traveling on the road transmitted from the terminal device among the communication data. The line aggregation device according to claim 1, wherein the line aggregation device is relayed. 2. The control unit relays the signal control command information with priority over relaying in a time zone other than the first time zone as the signal control command information is relayed in a predetermined first time zone. The line aggregation device according to claim 3. The line aggregation device can communicate with a plurality of the other line aggregation devices,
When the first condition is satisfied, the control unit selects at least one of the plurality of other line aggregation devices based on a priority related to the bandwidth of the other line aggregation device, and selects the selected other The line aggregation apparatus according to claim 1, wherein the communication data is relayed via a line aggregation apparatus. The line aggregation device can communicate with a plurality of the other line aggregation devices,
When the first condition is satisfied, the control unit determines a distribution ratio of communication data to a plurality of other line aggregation devices based on a priority related to a bandwidth of the other line aggregation device, and determines the determined 5. The communication data is distributed to a plurality of other line aggregation devices according to a distribution ratio, and the communication data is relayed through the plurality of other line aggregation devices. Line aggregation equipment. The line aggregation device according to claim 5 or 6, wherein the priority is determined according to a type and number of subordinate terminal devices connected to each of the other line aggregation devices. And a storage unit for storing signal control execution information indicating an execution result of the traffic signal controller under the line aggregation device,
The control unit accumulates the signal control execution information in the storage unit when communication is not possible between the line aggregation device and the central device, and communication between the line aggregation device and the central device is performed. The line aggregation device according to any one of claims 1 to 7, wherein when the signal is restored, the signal control execution information accumulated in the storage unit is transmitted to the central device. When the communication unit has not received the communication data from the central device via the other line aggregation device for a predetermined time, the control unit and the other line aggregation device The line aggregation device according to claim 1, wherein it is determined that communication cannot be performed with the central device. Traffic that is connected to a line aggregation device via an aggregation line and exchanges communication data via the line aggregation device with a plurality of terminal devices including a traffic signal controller installed on or on the road A central device installed in a control center,
A communication unit that exchanges the communication data with the plurality of terminal devices via the line aggregation device;
A controller that controls the communication unit to exchange the communication data with the plurality of terminal devices via the line aggregation device;
When the control unit cannot communicate with the line aggregation device and can communicate with another line aggregation device capable of communicating with the line aggregation device, the control unit passes through the other line aggregation device. A central device for exchanging the communication data with the line aggregation device. The control unit accumulates while communication with the line aggregation device is not possible when communication with the line aggregation device is possible, and when the second time zone is determined in advance. The central apparatus according to claim 10, wherein signal control execution information indicating an execution result of a traffic signal controller subordinate to the line aggregation device is acquired from the line aggregation device. A central device installed in the traffic control center;
A line aggregation device that relays communication data exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and the central device through an aggregation line laid between the central devices. And
The line aggregation device
The communication data is exchanged with the plurality of terminal devices and with the central device, and the communication data is exchanged with other line aggregation devices that can communicate with the line aggregation device. A communication unit to perform,
A control unit that relays the communication data exchanged between the plurality of terminal devices and the central device by controlling the communication unit;
The control unit satisfies the first condition that (i) communication cannot be performed between the line aggregation device and the central device, and communication can be performed between the other line aggregation device and the central device. Relaying the communication data via the other line aggregating apparatus, and (ii) either between the line aggregating apparatus and the central apparatus or between the other line aggregating apparatus and the central apparatus Signal control command information for controlling a traffic signal controller under control connected to the line aggregation device when the second condition that communication cannot be performed is satisfied, and the determined signal control command information A traffic control system for controlling the traffic signal controller under the control of the traffic signal controller. A communication line that is exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and a central device installed in a traffic control center, and is laid between the central devices. A traffic control method using a line aggregation device that relays through
When communication is not possible between the line aggregation device and the central device, and communication is possible between the line aggregation device and the central device that can communicate with the line aggregation device, the other Relaying the communication data via the line aggregation device of:
If communication cannot be performed between the line aggregation device and the central device and between the other line aggregation device and the central device, any one of the plurality of terminal devices Determine signal control command information for controlling a subordinate traffic signal controller connected to the line aggregation device based on information from a terminal device, and control the subordinate traffic signal based on the determined signal control command information A traffic control method comprising: controlling a controller. A communication line that is exchanged between a plurality of terminal devices including a traffic signal controller installed on the road or on the road side and a central device installed in a traffic control center, and is laid between the central devices. A program for causing a computer to function as a line aggregation device that relays through
The communication data is exchanged with the plurality of terminal devices and with the central device, and the communication data is exchanged with other line aggregation devices that can communicate with the line aggregation device. A communication unit to perform,
By controlling the communication unit, the computer functions as a control unit that relays the communication data exchanged between the plurality of terminal devices and the central device,
The control unit satisfies the first condition that (i) communication cannot be performed between the line aggregation device and the central device, and communication can be performed between the other line aggregation device and the central device. Relaying the communication data via the other line aggregating apparatus, and (ii) either between the line aggregating apparatus and the central apparatus or between the other line aggregating apparatus and the central apparatus A subordinate traffic signal controller connected to the line aggregation device based on information from any one of the plurality of terminal devices when the second condition that communication cannot be performed is satisfied. The program which determines the signal control command information for controlling, and controls the subordinate traffic signal controller based on the determined signal control command information.