JP4910583B2 - Traffic control router device, traffic signal controller - Google Patents

Description

  The present invention relates to a communication device for a traffic control system that relays communication data exchanged between devices in a traffic control system, and further includes a traffic signal controller, an optical beacon, and a car number reading device incorporating the communication device for the traffic control system. The present invention relates to a device, a signal control device, and an information providing device.

  In recent years, in traffic control systems, network systems using the Internet protocol (hereinafter referred to as IP) for the network layer (third layer) of the so-called OSI reference model have become widespread as communication procedures.

  As a traffic control system employing IP, for example, Patent Document 1 is disclosed.

  According to one embodiment described in Patent Document 1, even if a certain communication line is disconnected due to an accident or the like, a system is introduced that can form a detour route for communication by Internet routing technology. .

The UD transmission method has been standardized as a communication control system that employs IP.
In a network system employing the UD transmission method, as a device that relays communication data exchanged between devices, for example, a UD type line compatible unit (hereinafter referred to as a central router) or a UD type terminal line aggregation device (hereinafter referred to as a terminal). Router) etc. are standardized.

  Please refer to the New Traffic Management System Association (hereinafter referred to as the UTMS Association) for details on the UD type transmission system format and procedures, UD type transmission system operation guidelines and introduction manuals, and specifications of central routers and terminal routers. It is described in the standard document issued by.

  In the UD type transmission system, a central router is installed in a traffic control center and a terminal router is installed on a road, and one or more communication lines (hereinafter referred to as aggregated lines) are provided between them. A system terminal device (hereinafter referred to as a terminal device) can be connected.

  In the standard published by the UTMS Association, when a large number of terminal devices are connected under one aggregated line, a maximum communication bandwidth can be allocated to each of the various terminal devices. It is prescribed what should be done.

  The communication bandwidth is an accept response packet for the device that has received the communication data to the transmission source device when all the communication data that can be transmitted simultaneously by the terminal device or the central device is transmitted simultaneously (hereinafter, worst case). (Hereinafter, “accept”) is calculated as a value necessary to be able to be returned within a predetermined response timeout time.

  In addition, after sending the communication data, if the acceptance is not returned even after the response timeout period elapses, the communication data transmission source device does not reach the transmission destination device, and some communication abnormality (hereinafter, It is recognized that a failure has occurred.

  According to the standard, for example, when an analog line with a communication speed of 9600 bps is used as the aggregate line, the U-type traffic signal controller is 2600 bps, the UC type traffic signal controller is 2300 bps, and the optical beacon (for AMIS) It is recommended to allocate a communication bandwidth of 1900 bps.

  When constructing a network system, it is required that the total value of the communication bandwidths of the terminal devices connected under one aggregated line does not exceed the communication speed of the aggregated line. .

  When the number of terminal devices that can be connected to one aggregated line is calculated by the above method, for example, one U-shaped traffic signal controller and two optical beacons (for AMIS) can be connected.

  For example, when one traffic signal controller and one optical beacon are connected under the control of one terminal router directly connected to the aggregated line, the terminal router simultaneously receives communication data from these terminal devices. The terminal router transmits the received plurality of communication data to the aggregated line one by one in some order.

Similarly, when the central router receives the communication data addressed to the U-shaped traffic signal controller and the communication data addressed to the optical beacon at the same time, the central router transmits a plurality of received communication data one by one to the aggregation line in some order. To do.
Japanese Patent No. 3456170

  In this case, the order of transmission of the communication data in the terminal router and the central router is not particularly determined, and either of them may be transmitted first. Therefore, communication data for traffic signal controllers having high importance in the traffic control system. Could not be sent preferentially.

  Therefore, in a state where a large amount of optical beacon communication data is simultaneously transmitted, there is a problem that a large transmission delay occurs in the communication data for the traffic signal controller.

  Accordingly, an object is to limit the time required for communication of communication data having a predetermined attribute to a necessary limit by providing a router with a function of controlling transmission of the communication data according to the attribute of the communication data.

The traffic control router device of the present invention is a traffic control network system that adopts DATEX-ASN as a communication protocol of five or more layers of the OSI reference model, and a central device installed in the traffic control center and a traffic installed on the road. Communication data exchanged through an aggregated line laid between a plurality of terminal devices including a signal controller is relayed by the IP routing function, and received by the receiving means for receiving the communication data and received by the receiving means A transmission unit configured to transmit communication data; and a transmission control unit configured to control transmission of communication data by the transmission unit, wherein the transmission control unit is based on a message ID stored in the communication data received by the reception unit. To determine whether the communication data is control instruction information for the traffic signal controller. That includes a discrimination means, said discrimination means when it is determined that the instruction information of the control is characterized in that to transmit the communication data to the transmitting unit preferentially over other communication data (claim 1).

According to this invention, out of communication data exchanged in the traffic control network system, when failure occurs, the instruction information related to traffic signal control that seriously affects traffic signal control is accurately detected, and the information is prioritized. Can be transmitted automatically.

In addition, the traffic control network system in which the traffic control router device of the present invention is used is connected so that a plurality of terminal devices including the traffic signal controller communicate with the central device through the same aggregated line, The total value of the recommended communication bandwidth allocated according to the device type set in advance for each of these terminal devices can be configured to exceed the communication speed of the same aggregated line. In the traffic control network system, the traffic control router device may be connected to the same aggregated line to relay communication data exchanged through the same aggregated line (claim 2). ).

According to the present invention, it becomes possible to employ a network configuration that has been impossible since the instruction information related to traffic signal control that has a significant influence on traffic signal control may fail. The number of terminal devices that can be connected under the aggregated line of books can be expanded and operated.
This operation reduces the total number of aggregated lines used in the traffic control network system, reducing the impact on traffic signal control and reducing operational communication costs. It becomes possible.

A traffic signal controller according to the present invention is equipped with any one of the traffic control router devices (Claim 3 ).

According to the present invention, it is possible to integrate an internal traffic control for the router device to the traffic signal controller, it is possible to facilitate the Installation work, or the cost of the equipment is.

As described above, according to the present invention, when a failure occurs, it is possible to accurately detect instruction information related to traffic signal control that significantly affects traffic signal control and to transmit the information with priority.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of the configuration of a traffic control system including a terminal router according to the present invention.

  In FIG. 1, reference numeral 1 denotes a signal control device installed in a traffic control center, which communicates with a traffic signal controller 5 installed at an intersection via a central router 3, an aggregation line 7, and a terminal router 4. It has a function to exchange data.

  As the communication data exchanged between the signal control device 1 and the traffic signal controller 5, the signal control command for the signal control device 1 to instruct the traffic signal controller 5 on the lighting time of the blue signal and the red signal, etc. Information, signal execution history information of the traffic signal controller 5 (hereinafter, signal control execution information), and the like.

  Reference numeral 2 denotes an information providing device installed in a traffic control center, which has a function of exchanging communication data with an optical beacon 6 installed at an intersection via a central router 3, an aggregated line 7, and a terminal router 4. Have.

  Communication data exchanged between the information providing device 2 and the optical beacon 6 includes traffic jam information (hereinafter referred to as traffic jam link information) for the optical beacon 6 to transmit to a vehicle (not shown), light There is travel time information (hereinafter, vehicle information) received by the beacon 6 from a vehicle (not shown).

  Here, for example, the data flow of the communication data when the traffic signal controller 5 transmits the communication data addressed to the signal control device 1 to the terminal router 4 will be described.

  The central router 3 and the terminal router 4 are assumed to have a so-called IP routing function.

  First, the terminal router 4 acquires a destination IP address included in the communication data. Then, the IP routing function recognizes that the device having the transmission destination IP address exists ahead of the aggregation line 7 and transmits the communication data to the aggregation line 7.

  Next, the central router 3 receives the communication data transmitted to the aggregated line 7. Then, a transmission destination IP address included in the received communication data is acquired. Then, the IP routing function recognizes that the device having the destination IP address is the signal control device 1 connected to itself, and transmits the communication data to the signal control device 1.

  Through the above flow, the communication data transmitted by the traffic signal controller 5 reaches the signal control device 1.

Next, a procedure of processing in the terminal router 4 when communication data is simultaneously transmitted from the traffic signal controller 5 and the optical beacon 6 will be described with reference to FIG.
FIG. 2 is an example of a functional block configuration diagram of a communication device for a traffic control system according to the present invention.

The receiving unit 401 </ b> B receives the signal control execution information from the traffic signal controller 5.
The receiving means 401C receives vehicle information from the optical beacon 6.
These pieces of information are stored in storage means (not shown) such as a memory.

  In the first embodiment, the receiving means for receiving the communication data from the traffic signal controller 5 and the communication data from the optical beacon 6 are described differently. However, the same receiving means receives the communication data. It may be configured.

  That is, the traffic signal controller 5 and the optical beacon 6 are connected to the same HUB or the like, and one receiving means for receiving communication data from the HUB is provided, and the receiving means communicates from these two terminal devices. Data may be received.

  Then, the attribute acquisition unit 421 reads the received signal control execution information and vehicle information from the storage unit (not shown), acquires these attributes, associates them with each communication data, and stores the storage unit ( (Not shown).

  Attributes to be acquired include a protocol type indicating the type of communication protocol of communication data, a data type indicating the type of communication data, a transmission source device type indicating the type of the transmission source device of communication data, and a type of transmission destination device of the communication data. Destination device type to be displayed, presence / absence of response request indicating whether communication data is a request for response, receiving means identification number indicating receiving means that received communication data, transmitting means indicating transmitting means for transmitting communication data It is at least one of an identification number, a communication data transmission source IP address, a communication data transmission source port number, a communication data transmission destination IP address, and a communication data transmission destination port number.

  Here, a case where a data type indicating the type of communication data is acquired as an attribute will be described.

  The data type here refers to, for example, the type of whether the communication data is an end application message or other data such as an accept, and in the case of an end application message, the signal control execution information is further included. And the type of message such as the vehicle information.

  The data type may be, for example, a type indicating a category such as whether the communication data is data related to signal control or data related to a vehicle detector.

  Normally, the type of data in the end application message can be identified by the message ID stored in the communication data.

  The message ID is information for identifying the type of communication data expressed by a combination of a plurality of node numbers, and a unique combination of the plurality of node numbers is assigned to each data type.

  The message ID can be acquired by referring to the field in which the message ID is stored in the communication data.

  Details of the message ID are described in a standard document issued by the UTMS Association.

  Then, the transmission control unit 431 reads the attribute stored in association with each communication data from the storage unit (not shown), and reads the attribute from the priority table 432 stored in advance in the storage unit (not shown). Get the priority according to the attribute.

FIG. 3 is a diagram illustrating a priority table 432 that stores the priority for each data type that is an attribute.
Since the attribute of the communication data received from the traffic signal controller 5 is “signal control execution information”, the transmission control unit 431 acquires “high” as the priority corresponding to the attribute, and similarly, the optical beacon 6 Since the attribute of the communication data received from is “vehicle information”, “standard” is acquired as the priority corresponding to the attribute.

  Then, the transmission control means 431 determines a transmission order in which the signal control execution information with the priority “high” is transmitted first, and the vehicle information with the priority “standard” is transmitted next, according to the acquired priority. To do.

  On the other hand, the transmission selection unit 491 acquires the transmission destination IP address stored in the received signal control execution information and vehicle information, and refers to the routing information table 492 based on the acquired transmission destination IP address, The transmission means for transmitting the signal control execution information and the vehicle information is selected.

  Here, in the routing information table 492, there is one piece of communication path information indicating a combination of an IP address or an IP address group (hereinafter referred to as a destination network address) as a transmission destination of communication data and a gateway corresponding to the destination network address. The above is stored.

  The communication path information stored in the routing information table 492 may be in any format as long as it can select a transmission means for transmitting communication data based on the destination network address.

  Since both the signal control execution information and the vehicle information transmission destination devices exist at the end of the aggregated line 7, the transmission selection unit 491 selects the transmission unit 411A as the transmission unit, and the selected transmission unit 411A. However, according to the transmission order determined by the transmission control means 431, the signal control execution information is transmitted first, and then the vehicle information is transmitted to the aggregation line 7.

As described above, the terminal router 4 determines the transmission order of the communication data according to the attribute, so that the communication data transmitted by the traffic signal controller 5 can be transmitted before the communication data transmitted by the optical beacon 6. it can.
Thereby, the communication required time until the communication data of the traffic signal controller 5 reaches the signal control device 1 can be set as a necessary limit.

  In the above case, the aggregated line 7 may become abnormal while the second communication data is transmitted after the first communication data is transmitted. By transmitting the high communication data first, it is possible to reduce the probability that the communication data of the traffic signal controller 5 having a high priority will fail.

Moreover, when acquiring a data type as an attribute as mentioned above, for example, when communication data is acceptance, a method of transmitting the data with higher priority than other communication data is also conceivable.
By doing so, it is possible to make the time required for accepting communication to be a necessary limit, and therefore it is possible to reduce the probability of occurrence of a failure.

Note that the transmission control unit 431 may determine transmission timing according to priority rather than transmission order.
That is, for example, immediate transmission when the priority is “high”, transmission after 500 ms when the priority is “standard”, transmission after 1000 ms when the priority is “low”, etc. A method of determining the transmission timing according to the priority may be used.

  Further, the transmission control means 431 may determine both the transmission timing and the transmission order according to the priority.

  Next, as another mode of the first embodiment, a case where the attribute acquisition unit 421 acquires other than the data type as an attribute will be described.

  Among the attributes, the protocol type indicates the type of communication protocol adopted by the communication data. As the protocol type, for example, TCP or UDP corresponding to the four layers (transport layer) of the OSI reference model, FTP, TELNET, HTTP, DATEX-ASN, or the like corresponding to five layers or more are equivalent.

In the case of the UD transmission method, the information related to the system application in the traffic control system adopts DATEX-ASN as a protocol. For example, the priority of DATEX-ASN is set high and the priority of other protocol types is set low. A method of transmitting communication data having the attribute DATEX-ASN earlier than other communication data is conceivable.

The details of the DATEX-ASN are described in a standard document issued by the UTMS Association.

  Among the attributes, the transmission source device type indicates the type of the transmission source device that has transmitted the communication data. Examples of the transmission source device type include a traffic signal controller, an optical beacon, a vehicle detector, a traffic information board, a car number reading device, a signal control device, an information providing device, and the like.

As a method of acquiring the transmission source device type, for example, a correspondence table (not shown) of the transmission source device type and the IP address is held, and the correspondence table (not shown) is based on the transmission source IP address of the communication data. ) From the transmission source device type.
Also, a method of acquiring the communication data transmission source device type by the correspondence between the communication data type and the device type may be used.

  In this case, the priority of the traffic signal controller or signal control device is set high and the priority of the other device is set low, and the communication data of the traffic signal controller or signal control device is set to other attributes. A method may be considered in which transmission is prioritized over the other.

  Among the attributes, the transmission destination device type indicates the type of the transmission destination device that transmits the communication data. As an attribute acquisition method and a priority assignment method, the same methods as in the case of the transmission source device type can be considered.

The presence / absence of a response request among the attributes indicates whether or not a device that receives communication data needs to transmit an accept for the communication data. Normally, it is necessary to transmit an accept if the response request flag included in the communication data is “ON”, and it is not necessary to transmit an accept if the response request flag is “OFF”.
That is, if the response request flag is “ON”, the response request is “present”, and if “OFF”, it is “not present”.

Usually, when the presence / absence of a response request is “present”, it indicates that it is not necessary to confirm the arrival of communication data with respect to the transmission destination device. Therefore, it is considered that the importance of the communication data is low.
Therefore, if the presence / absence of the response request is “Yes”, the priority is set high, and if it is “No”, the priority is set low, and the communication data with the response request presence / absence “Yes” is prioritized and transmitted Such a method can be considered.

  Among the attributes, the receiving means identification number indicates which receiving means has received the communication data among a plurality of receiving means of the terminal router 4. “1” can be set for the receiving means 401A, “2” for the receiving means 401B, “3” for the receiving means 401C, and so on.

  For example, when the terminal router 4 has a functional block configuration as shown in FIG. 2, the communication data from the receiving means 401B is information from the traffic signal controller 5, and the communication data from the receiving means 401B is information from the optical beacon 6. Since the priority of the communication data with the attribute 2 is high and the priority of the 3 is set low, the communication data from the traffic signal controller 5 is preferentially transmitted. Can be considered.

  Among the attributes, the transmission means identification number indicates which transmission means is the communication data to be transmitted among the plurality of transmission means of the terminal router 4. As an attribute acquisition method and a priority assignment method, the same methods as in the case of the receiving means identification number can be considered.

  Among the attributes, the transmission source IP address indicates the transmission source IP address included in the received communication data.

  For example, the priority of the IP address assigned to the traffic signal controller 5 is set high, the priority of the IP address assigned to the optical beacon 6 is set low, and the source IP address is that of the traffic signal controller 5 If so, a method may be considered in which the communication data is transmitted with priority over other attributes.

  Of the attributes, the destination IP address indicates the destination IP address included in the received communication data. As an attribute acquisition method and a priority assignment method, the same method as in the case of the transmission source IP address can be considered.

  Among the attributes, the transmission source port number is a TCP or UDP port number in the 4th layer (transport layer) of the OSI reference model, and indicates the port number of the transmission source of the communication data.

  For example, the priority of the port number used when the traffic signal controller 5 transmits communication data is set high, and the priority of the port number used by the optical beacon 6 is set low, and the transmission source port controls the traffic signal. In the case of the device 5, a method of transmitting the communication data with priority over other attributes can be considered.

  Among the attributes, the transmission destination port number is a TCP or UDP port number in the fourth layer (transport layer) of the OSI reference model, and indicates a transmission data port number. As for the attribute acquisition method and the priority assignment method, the same method as in the case of the transmission source port number can be considered.

  In this embodiment, the data type is adopted as the attribute, and the attribute item of the priority table is only the data type. However, it is possible to adopt a plurality of attributes and set the priority according to each combination. good.

  For example, the protocol type is adopted as the attribute in addition to the data type, and when the protocol type is other than DATEX-ASN, the priority is uniformly lowered, and when the protocol type is DATEX-ASN, the priority is set according to the data type. A method for setting the value may be used.

  Also, for example, the response request presence / absence and the source IP address are adopted as attributes. If the response request presence / absence is “None”, the priority is uniformly lowered. If the response request presence / absence is “Yes”, the source IP address is set. A method of setting the priority according to the above may be used.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings.
The system configuration of this embodiment is the same as that of FIG. 1, and the data flow of communication data is also the same as that of the first embodiment.

First, the procedure of processing in the terminal router 4 when communication data is transmitted from the traffic signal controller 5 after 100 ms has passed since the communication data was transmitted from the optical beacon 6 will be described with reference to FIG.
FIG. 4 is an example of a functional block configuration diagram of the terminal router 4 according to the present invention.

First, the receiving means 401 </ b> C receives vehicle information from the optical beacon 6.
And the received vehicle information is memorize | stored in memory | storage means (not shown), such as memory.

  Then, the attribute acquisition unit 421 reads the received vehicle information from the storage unit (not shown), acquires the attribute, and stores the attribute in association with the vehicle information in the storage unit (not shown).

  Here, a case where a data type indicating the type of communication data is acquired as an attribute will be described.

  The data type here is the same as in the case of the first embodiment.

  Then, the transmission control unit 431 reads the stored attribute from the storage unit (not shown), and responds to the acquired attribute from the transmission waiting time table 433 previously stored in the storage unit (not shown). Get the transmission wait time.

FIG. 5 is a diagram showing a transmission waiting time table 433 in which the transmission waiting time is stored for each data type that is an attribute.
Here, since the attribute of the communication data received from the optical beacon 6 is “vehicle information”, the transmission control unit 431 acquires “500 ms” as the transmission waiting time corresponding to the attribute.

  Then, the transmission control means 431 determines the transmission timing of transmitting the vehicle information after 500 ms has elapsed after reception, according to the acquired transmission waiting time.

  Note that the transmission control means 431 may determine the transmission timing not after 500 ms has elapsed after receiving the vehicle information but after 500 ms has elapsed since the last transmission of communication data.

Next, the receiving means 401 </ b> B receives signal control execution information from the traffic signal controller 5.
The received signal control execution information is stored in storage means (not shown) such as a memory.

  The attribute acquisition unit 421 reads the received signal control execution information from the storage unit (not shown), acquires the attribute, and stores the attribute in association with the signal control execution information in the storage unit (not shown).

  Then, the transmission control unit 431 reads the stored attribute from the storage unit (not shown), and responds to the acquired attribute from the transmission waiting time table 433 previously stored in the storage unit (not shown). Get the transmission wait time.

  Since the attribute of the communication data received from the traffic signal controller 5 is “signal control execution information”, the transmission control unit 431 acquires “0 ms” as the transmission waiting time corresponding to the attribute.

  Then, the transmission control means 431 determines the transmission timing to transmit the signal control execution information immediately after receiving (after 0 ms has elapsed), according to the acquired transmission waiting time.

  Since both the signal control execution information and the vehicle information transmission destination devices exist at the end of the aggregated line 7, the transmission selection unit 491 selects the transmission unit 411A, as in the first embodiment, and The selected transmission means 411A transmits to the aggregated line 7 according to the transmission timing determined by the transmission control means 431.

  In the case of the second embodiment, for example, it is very effective when the time required for the terminal router 4 to complete transmission of vehicle information is 1000 ms.

  Conventionally, the terminal router 4 transmits the vehicle information received earlier immediately after receiving it.

  In this case, the signal control execution information received at 100 ms after the start of transmission of vehicle information could not be transmitted for 900 ms until the transmission of vehicle information was completed.

  However, according to the invention shown in the second embodiment, since the vehicle information is in a standby state for 500 ms after reception, the signal control execution information that arrives while the vehicle information is in standby is immediately and immediately received. Can be sent to.

  Thus, conventionally, the communication standby time of the signal control execution information in the terminal router 4 was 900 ms, but according to the present invention, the transmission standby time can be set to 0 ms, which is the necessary limit.

  As described above, by using the method of determining the transmission waiting time according to the attribute, not only when a plurality of communication data is received simultaneously, but also when a plurality of communication data are received within a predetermined time, Can be preferentially transmitted, and the time required for communication can be made the necessary limit.

That is, the terminal router 4 determines the transmission timing of the communication data according to the attribute, so that the communication data transmitted by the traffic signal controller 5 can be transmitted before the communication data transmitted by the optical beacon 6.
Thereby, the communication required time until the communication data of the traffic signal controller 5 reaches the signal control device 1 can be set as a necessary limit.

  The terminal router 4 holds both the priority table 432 and the transmission waiting time table 433, and determines both the priority and the transmission waiting time according to the attribute, for example, using the transmission waiting time table 433. For communication data having the same determined transmission timing, a method of determining the transmission order according to the priority of the priority table 432 and transmitting the communication data can be used.

  Moreover, in this Embodiment, although the receiving means which receives the communication data from the traffic signal controller 5 and the communication data from the optical beacon 6 is described differently, it becomes a structure which receives by the same receiving means. May be.

  That is, the traffic signal controller 5 and the optical beacon 6 are connected to the same HUB or the like, and one receiving means for receiving communication data from the HUB is provided, and the receiving means communicates from these two terminal devices. Data may be received.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to the drawings.
The system configuration of this embodiment is the same as that of FIG. 1, and the data flow of communication data is also the same as that of the first embodiment.

First, the processing procedure in the terminal router 4 when communication data is transmitted from the optical beacon 6 will be described with reference to FIG.
FIG. 6 is an example of a functional block configuration diagram of a terminal router according to the present invention.

First, the receiving means 401 </ b> C receives vehicle information from the optical beacon 6.
And the received vehicle information is memorize | stored in memory | storage means (not shown), such as memory.

  Then, the attribute acquisition unit 421 reads the received vehicle information from the storage unit (not shown), acquires the attribute, and stores the attribute in association with the vehicle information in the storage unit (not shown).

  Here, a case will be described in which a transmission source device type indicating the type of communication data transmission source device is acquired as an attribute.

  Here, the transmission source device type indicates the type of device, for example, whether the communication data transmission source device is a traffic signal controller or an optical beacon.

  The attribute acquisition unit 421 refers to a transmission source device type table (not shown) indicating the correspondence between the IP address and the transmission source device type, and determines the transmission source device type based on the transmission source IP address stored in the communication data. get.

On the other hand, the transmission / reception data amount setting means 441 is configured to receive total communication data by attribute of communication data transmitted / received within a predetermined time every predetermined period or whenever a specific event such as transmission or reception of communication data occurs. Amount, total amount of data transmitted by attribute, average amount of received data by attribute, average amount of transmitted data by attribute, total number of reception by attribute, total number of transmission by attribute, average number of reception by attribute, average number of transmission by attribute One is set in the transmission / reception data amount table 442.
Here, a case where the total number of receptions by attribute is set in the transmission / reception data amount table 442 for each communication data reception event will be described.

  When the vehicle information is received from the optical beacon 6, the transmission / reception data amount setting unit 441 has a predetermined length from the time when the vehicle information is received out of all communication data received by the terminal router 4 so far. The total number of receptions by attribute of the communication data received until a point in time preceding the predetermined time (for example, about 5 seconds) is calculated and set in the transmission / reception data amount table 442.

  When the transmission / reception data amount setting means 441 sets the total number of receptions by attribute, for example, an all reception data table (not shown) in which attributes and reception times of all received communication data are stored in association with each other is separately provided. A method may be considered in which the number of transmissions / receptions by attribute within the predetermined time is calculated with reference to the all received data table (not shown).

Note that data may be added to the all reception data table (not shown) each time the receiving means 401A to 401C receive communication data, or the transmission control means 431 adds. Also good.
Further, the entire received data table (not shown) may be stored only for a predetermined period (for example, 1 hour) in consideration of the capacity of the storage means.

  FIG. 7 is a diagram showing a transmission / reception data amount table 442 that stores the total number of receptions by attribute for each transmission source apparatus type that is an attribute.

  On the other hand, the transmission control means 431 reads the stored attribute from the storage means (not shown), and sets the acquired attribute from the transmission waiting time table 433 stored in advance in the storage means (not shown). Acquire the corresponding transmission waiting time.

  Further, the transmission control means 431 acquires the total number of receptions by attribute according to the acquired attribute from the transmission / reception data amount table 442.

  For example, if the acquired transmission waiting time is 500 ms and the total number of receptions by attribute is 2, the transmission control unit 431 determines 1000 ms multiplied by these as the corrected transmission waiting time.

  And the transmission control means 431 determines the transmission timing of transmitting vehicle information 1000 seconds after receiving according to the transmission waiting time after the correction.

  In this case, since the information providing device 2 that is the vehicle information transmission destination device is present at the destination of the aggregated line 7, the transmission selection unit 491 selects the transmission unit 411A, as in the first embodiment, and The selected transmission unit 411A transmits the vehicle information to the aggregated line 7 according to the transmission timing determined by the transmission control unit 431.

  In this way, by correcting the transmission waiting time with the amount of transmission / reception data for each attribute within a predetermined time, it is possible to avoid that communication data having a specific attribute occupies the use of the aggregated line 7.

  The correction method is not limited to the above. For example, a method of adding a value obtained by uniformly multiplying the number of transmission / reception by attribute to 100 ms to the acquired transmission waiting time may be used.

  According to the third embodiment, for example, when two communication data are continuously received from the optical beacon 6, the first communication data is changed to the second communication data after 500 ms. The transmission can be performed after 1000 ms, and for example, the situation where the communication data of the optical beacon 6 occupies the aggregated line 7 can be avoided.

  In this way, it is possible to relatively create a state in which the communication data of the traffic signal controller 5 is transmitted to the aggregated line 7 preferentially, and the communication required time of the communication data of the traffic signal controller 5 can be reduced. It can be kept to the necessary limit.

  For example, the value set in the transmission / reception data amount table 442 is not limited to the total number of receptions by attribute, but may be the total number of transmissions by attribute or the like, or a combination thereof.

  For example, in the case of using the total transmission data amount by attribute, for example, depending on what percentage of the maximum data amount the transmission data amount corresponds to in advance, the transmission waiting time using a coefficient corresponding to the ratio Or a method of correcting the waiting time in proportion to the ratio can be used.

  As described above, by correcting the transmission waiting time determined according to the attribute using the amount of transmission / reception data for each attribute within the predetermined time, it is avoided that communication data having the attribute occupies the aggregated line 7 In addition, the line usage rate for each attribute can be controlled.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to the drawings.
The system configuration of this embodiment is the same as that of FIG. 1, and the data flow of communication data is also the same as that of the first embodiment.

First, the processing procedure in the terminal router 4 when communication data is transmitted from the optical beacon 6 will be described with reference to FIG.
FIG. 8 is an example of a functional block configuration diagram of a terminal router according to the present invention.

First, the receiving means 401 </ b> C receives vehicle information from the optical beacon 6.
And the received vehicle information is memorize | stored in memory | storage means (not shown), such as memory.

  Then, the attribute acquisition unit 421 reads the received vehicle information from the storage unit (not shown), acquires the attribute, and stores the attribute in association with the vehicle information in the storage unit (not shown).

  Here, a case will be described in which a transmission source device type indicating the type of communication data transmission source device is acquired as an attribute.

  As a method for acquiring the transmission source device type, a method similar to that of the third embodiment can be used.

On the other hand, the transmission / reception data amount setting means 441 is configured to receive total communication data by attribute of communication data transmitted / received within a predetermined time every predetermined period or whenever a specific event such as transmission or reception of communication data occurs. Amount, total amount of data transmitted by attribute, average amount of received data by attribute, average amount of transmitted data by attribute, total number of reception by attribute, total number of transmission by attribute, average number of reception by attribute, average number of transmission by attribute One is set in the transmission / reception data amount table 442.
Here, a case where the total number of receptions by attribute is set in the transmission / reception data amount table 442 for each communication data reception event will be described.

  As a setting method for the transmission / reception data amount table 442 by the transmission / reception data amount setting means 441, the same method as in the third embodiment can be used.

  On the other hand, the transmission control unit 431 reads the stored attribute from a storage unit (not shown), and acquires the total reception count by attribute according to the read attribute from the transmission / reception data amount table 442.

  Further, the transmission control unit 431 acquires an allocated bandwidth corresponding to the acquired attribute from an allocated bandwidth table 451 stored in advance in a storage unit (not shown).

  FIG. 9 is a diagram showing an allocated bandwidth table 451 storing the allocated bandwidth for each transmission source device type that is an attribute.

  And the transmission control means 431 determines the transmission timing of the received vehicle information based on the acquired total number of receptions by attribute and the allocated bandwidth.

  For example, if the acquired allocated bandwidth is three times and the total number of receptions by attribute is two, the transmission control means 431, for example, immediately after receiving the vehicle The transmission timing for transmitting information is determined.

  Also, for example, if the acquired allocated bandwidth is 3 times and the total number of receptions by attribute is 4 times, the value of the allocated bandwidth is exceeded. The transmission timing of transmitting the vehicle information later is determined.

  In this case, since the information providing device 2 that is the vehicle information transmission destination device is present at the destination of the aggregated line 7, the transmission selection unit 491 selects the transmission unit 411A, as in the first embodiment, and The selected transmission unit 411A transmits the vehicle information to the aggregated line 7 according to the transmission timing determined by the transmission control unit 431.

  Thus, by determining the transmission timing based on the transmission / reception data amount and the allocated bandwidth, it is possible to control the usage rate of the aggregated line 7 for each attribute.

  According to the fourth embodiment, for example, the communication data transmitted from the optical beacon 6 is given a small allocated bandwidth, while the traffic signal controller 5 is given a large allocated bandwidth, so that the relative Therefore, it is possible to create a state in which communication data from the traffic signal controller 5 is preferentially transmitted compared to communication data from the optical beacon 6, and the time required for communication of the communication data of the traffic signal controller 5 is required. Limit to the limit.

  For example, the value set in the transmission / reception data amount table 442 is not limited to the total number of receptions by attribute, but may be the total number of transmissions by attribute or the like, or a combination thereof.

For example, when using the total transmission data amount by attribute, for example, a method of determining the transmission waiting time depending on whether the total transmission data amount by attribute exceeds the allocated bandwidth can be used. .
Alternatively, it is possible to use a method of determining the transmission waiting time stepwise, a method of increasing or decreasing the waiting time in proportion to the ratio, etc. depending on what percentage of the allocated bandwidth the transmission data amount corresponds to.

  As described above, by determining the transmission timing of communication data based on the amount of transmission / reception data for each attribute and the allocated bandwidth corresponding to the attribute, the usage rate of the aggregated line 7 of communication data having the attribute is controlled. Communication data having a specific attribute can be transmitted with priority over communication data having other attributes.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 10 is a schematic diagram showing a configuration of a traffic control system including a terminal router according to the present invention.

  In FIG. 10, reference numeral 1 denotes a signal control device installed in a traffic control center, which communicates with a traffic signal controller 5 installed at an intersection via a central router 3, an aggregation line 7, and a terminal router 4. It has a function to exchange data.

  As the communication data exchanged between the signal control device 1 and the traffic signal controller 5, the signal control command for the signal control device 1 to instruct the traffic signal controller 5 on the lighting time of the blue signal and the red signal, etc. Information, signal control execution information of the traffic signal controller 5 that the traffic signal controller 5 transmits to the signal control device 1, and the like.

  2 is an information providing apparatus installed in the traffic control center, and communicates with the optical beacons 6A, 6B, 6C and 6D installed at the intersections via the central router 3, the aggregated line 7, and the terminal router 4. It has a function to exchange data.

  As communication data exchanged between the information providing device 2 and the optical beacons 6A to 6D, the traffic link information for the optical beacons 6A to 6D to transmit to the vehicle (not shown), the optical beacons 6A to 6D, and the like. 6D includes vehicle information received from a vehicle (not shown).

  Here, for example, the data flow of the communication data when the traffic signal controller 5 transmits the communication data addressed to the signal control device 1 to the terminal router 4 is the same as in the case of the first embodiment. is there.

  In this system configuration, if the communication speed of the aggregated line 7 is an analog line of 9600 bps, the traffic signal controller 5 is a U-shaped traffic signal controller, and the optical beacons 6A to 6D are optical beacons (for AMIS). think of.

  According to the UTMS Association standard, when using an analog line for the introduction of the UD transmission system, it is recommended to allocate a communication bandwidth of 2600 bps for U-shaped traffic signal controllers and 1900 bps for optical beacons (for AMIS). However, in the system configuration of the fifth embodiment, the total communication bandwidth required for the terminal devices under the terminal router 4 is 10200 bps, which exceeds the communication speed of the aggregated line 7.

  Therefore, in the case of this system configuration, since a failure may occur in the worst case, until now, such a system configuration could not be made in consideration of the influence on traffic signal control.

  However, by applying the terminal router 4 in the invention shown in the first to fourth embodiments to this system, for example, the communication data of the traffic signal controller 5 is transmitted with priority over the optical beacons 6A to 6D. Thus, even in the worst case, it is possible to avoid a failure for the communication data of the traffic signal controller 5.

  By performing the priority control, there is a possibility that the communication data of the optical beacons 6A to 6D may fail. However, even if the communication data of the optical beacon is a specific condition, the traffic is The impact on signal control is very small.

  As described above, by using the terminal router 4 in the invention shown in the first to fourth embodiments, the influence of the traffic signal control that has not been conventionally taken into consideration in the fifth embodiment can be obtained. It is possible to adopt such a system configuration, and it is possible to operate by expanding the number of terminal devices that can be connected under one aggregated line than before.

  As described above, if the number of terminal devices that can be connected under one aggregated line is expanded, the total number of aggregated lines used in the traffic control system can be reduced. It is very useful because the communication cost for operation can be reduced while reducing the influence.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 11 is a schematic diagram showing a configuration of a traffic control system including a terminal router according to the present invention.

  In FIG. 11, reference numeral 1 denotes a signal control device installed in a traffic control center, which is connected to traffic signal controllers 5A and 5B installed at intersections via a central router 3, an aggregation line 7A, and a terminal router 4A. It has a function to exchange communication data.

  As the communication data exchanged between the signal control device 1 and the traffic signal controllers 5A and 5B, the signal control device 1 instructs the traffic signal controllers 5A and 5B to turn on the blue signal and the red signal. Signal control command information to be transmitted, signal control execution information of the traffic signal controller 5A or 5B transmitted from the traffic signal controller 5A or 5B to the signal control device 1, and the like.

  Reference numeral 2 denotes an information providing device installed in the traffic control center, and optical beacons 6A, 6B, 6C and 6D installed at intersections via the central router 3, the aggregated line 7A or 7B, and the terminal router 4A or 4B. Has a function of exchanging communication data between them.

  As communication data exchanged between the information providing device 2 and the optical beacons 6A to 6D, the traffic link information for the optical beacons 6A to 6D to transmit to the vehicle (not shown), the optical beacons 6A to 6D, and the like. 6D includes vehicle information received from a vehicle (not shown).

  Here, for example, the data flow of the communication data when the traffic signal controller 5A transmits the communication data addressed to the signal control device 1 to the terminal router 4A is the same as in the case of the first embodiment. is there.

In this system configuration, a bypass line 8 is separately provided between the terminal routers 4A and 4B.
Similar to the system introduced in Patent Document 1, the terminal router 4A has an IP routing function, so that even if the aggregated line 7A is disconnected due to an accident or the like, the detour line 8 is utilized, The traffic signal controllers 5A and 5B and the optical beacon 6A connected to the terminal router 4A can transmit and receive communication data to and from the central device.

  In this system configuration, it is assumed that the communication speed of the aggregated line 7B is an analog line of 9600 bps, the traffic signal controllers 5A and 5B are U-shaped traffic signal controllers, and the optical beacons 6A to 6D are optical beacons (for AMIS). Consider a case.

  In this system configuration, if the aggregate line 7A is disconnected due to an accident or the like, the traffic signal controllers 5A and 5B and the optical beacon 6A are connected to the terminal router 4A, the detour line 8, the terminal router 4B, the aggregate line 7B, and the central router. 3 can communicate with the signal control device 1 or the information providing device 2.

  Accordingly, a total of six terminal devices including the traffic signal controllers 5A and 5B and the optical beacons 6A to 6D communicate using the aggregated line 7B.

  Similar to the fifth embodiment, the total communication bandwidth required for the six terminal devices is 12800 bps, which exceeds the communication speed of the aggregated line 7B.

  In this system configuration, when an accident or the like occurs in the aggregated line 7A and a detour route is formed using the detour line 8, a failure may occur in the worst case. Such a system configuration could not be adopted in consideration of the influence.

  However, by applying the terminal routers 4A and 4B in the invention shown in the first to fourth embodiments to this system, for example, the communication data of the traffic signal controllers 5A and 5B is given priority over the optical beacons 6A to 6D. Therefore, even in the worst case, the communication data of the traffic signal controllers 5A and 5B can be prevented from failing.

  By performing the priority control, there is a possibility that the communication data of the optical beacons 6A to 6D may fail. However, even if the communication data of the optical beacon is a specific condition, the traffic is The impact on signal control is very small.

  As described above, by using the terminal routers 4A and 4B in the inventions shown in the first to fourth embodiments, the sixth embodiment, which has been impossible in the past in consideration of the influence on traffic signal control. It becomes possible to adopt the system configuration as in the embodiment, and it is possible to operate by expanding the number of terminal devices that can be connected under the aggregated line per one than before.

  As described above, if the number of connected terminal devices is expanded, it is possible to reduce the total number of aggregated lines used in the traffic control system while providing a system configuration in which detour lines are provided between terminal routers. A system that is resistant to accidents and the like can be constructed at a low communication cost, which is very useful.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described in detail with reference to the drawings.

  The system configuration of the present embodiment is the same as that in FIG. 1. In this system configuration, for example, the communication data when the signal control device 1 transmits communication data addressed to the traffic signal controller 5 to the central router 3. The data flow will be described.

  The central router 3 and the terminal router 4 are assumed to have a so-called IP routing function.

  First, the central router 3 acquires a transmission destination IP address included in the communication data. Then, the IP routing function recognizes that the device having the transmission destination IP address exists ahead of the aggregation line 7 and transmits the communication data to the aggregation line 7.

  Next, the terminal router 4 receives the communication data transmitted to the aggregated line 7. Then, a transmission destination IP address included in the received communication data is acquired. Then, the IP routing function recognizes that the device having the destination IP address is the traffic signal controller 5 connected to itself, and transmits the communication data to the traffic signal controller 5.

  With the above flow, the communication data transmitted by the signal control device 1 reaches the traffic signal controller 5.

Next, a processing procedure in the central router 3 when communication data is simultaneously transmitted from the signal control device 1 and the information providing device 2 will be described with reference to FIG.
FIG. 12 is an example of a functional block configuration diagram of the central router according to the present invention.

The receiving unit 301 </ b> A receives signal control command information from the signal control device 1.
The receiving unit 301B receives the traffic jam link information from the information providing device 2.
These pieces of information are stored in storage means (not shown) such as a memory.

  And the attribute acquisition means 321 reads the received signal control command information and traffic jam link information from the storage means (not shown), acquires these attributes, and associates them with each communication data to store the storage means (Not shown).

  Attributes to be acquired include a protocol type indicating the type of communication protocol of communication data, a data type indicating the type of communication data, a transmission source device type indicating the type of the transmission source device of communication data, and a type of transmission destination device of the communication data. Destination device type to be displayed, presence / absence of response request indicating whether communication data is a request for response, receiving means identification number indicating receiving means that received communication data, transmitting means indicating transmitting means for transmitting communication data It is at least one of an identification number, a communication data transmission source IP address, a communication data transmission source port number, a communication data transmission destination IP address, and a communication data transmission destination port number.

  Here, a case where a data type indicating the type of communication data is acquired as an attribute will be described.

  The data type can be acquired by the same method as in the first embodiment.

  Then, the transmission control unit 331 reads the attribute stored in association with each communication data from the storage unit (not shown), and the priority table 332 stored in advance in the storage unit (not shown). The priority according to the read attribute is acquired.

FIG. 3 is a diagram showing a priority table 332 that stores priorities for each data type that is an attribute.
Here, since the attribute of the communication data received from the signal control device 1 is “signal control command information”, the transmission control unit 331 acquires “high” as the priority corresponding to the attribute, and similarly, the information Since the attribute of the communication data received from the providing device 2 is “congestion link information”, “standard” is acquired as the priority corresponding to the attribute.

  Then, the transmission control unit 331 performs a transmission order in which the signal control command information with the priority “high” is transmitted first and the traffic jam link information with the priority “standard” is transmitted next, according to the acquired priority. decide.

  On the other hand, the transmission selection unit 391 acquires the transmission destination IP address stored in the received signal control command information and the traffic jam link information, and refers to the routing information table 392 based on the acquired transmission destination IP address. A transmission means for transmitting the signal control command information and the traffic jam link information is selected.

  Here, the routing information table 392 stores one or more communication path information indicating a combination of a destination network address and a gateway for transmitting communication data whose destination is the destination network address.

  The communication path information stored in the routing information table 392 may be in any format as long as it is information for selecting a transmission means based on the destination network address.

  Since the transmission destination devices of the signal control command information and the traffic jam link information are both present at the end of the aggregated line 7, the transmission selection unit 391 selects the transmission unit 311A as the transmission unit, and the selected transmission unit In accordance with the transmission order determined by the transmission control means 331, 311A transmits the signal control command information first and the congestion link information to the aggregated line 7 next.

As described above, the central router 3 determines the transmission order of the communication data according to the attribute, so that the communication data transmitted by the signal control device 1 can be transmitted before the communication data transmitted by the information providing device 2. it can.
Thereby, the communication required time until the communication data of the signal control device 1 reaches the traffic signal controller 5 can be set as a necessary limit.

  Further, in the above case, after the transmission of the first communication data, there is a possibility that the aggregated line may become abnormal while the second communication data is being transmitted. By transmitting high communication data first, it is possible to reduce the probability that communication data addressed to the traffic signal controller 5 having a high priority will fail.

  The central router 3 transmits the signal control device 1 by performing priority control using the same functional configuration (FIGS. 12 to 15) as that of the terminal router 4 shown in the second to sixth embodiments. Communication data can be transmitted before communication data transmitted by the information providing apparatus 2.

  In some cases, the time required for communication until the communication data of the signal control device 1 reaches the traffic signal controller 5 can be set as a necessary limit.

  In some cases, the line usage rate for each attribute can be controlled.

  In some cases, communication data having a specific attribute can be preferentially transmitted over communication data having other attributes.

  In some cases, since the total number of aggregated lines used in the traffic control system can be reduced, it is possible to reduce the communication cost for operation, which is very useful.

  In some cases, it is possible to reduce the total number of aggregated lines used in the traffic control system by providing a detour line between terminal routers. Cost can be reduced and it is very useful.

(Eighth embodiment)
Next, an eighth embodiment of the present invention will be described in detail with reference to the drawings.
The system configuration of this embodiment is the same as that shown in FIG.

  In FIG. 11, reference numeral 1 denotes a signal control device installed in a traffic control center, which is connected to traffic signal controllers 5A and 5B installed at intersections via a central router 3, an aggregation line 7A, and a terminal router 4A. It has a function to exchange communication data.

  As the communication data exchanged between the signal control device 1 and the traffic signal controllers 5A and 5B, the signal control device 1 instructs the traffic signal controllers 5A and 5B to turn on the blue signal and the red signal. Signal control command information to be transmitted, signal control execution information of the traffic signal controller 5A or 5B transmitted from the traffic signal controller 5A or 5B to the signal control device 1, and the like.

  Reference numeral 2 denotes an information providing device installed in the traffic control center, and optical beacons 6A, 6B, 6C and 6D installed at intersections via the central router 3, the aggregated line 7A or 7B, and the terminal router 4A or 4B. Has a function of exchanging communication data between them.

  As communication data exchanged between the information providing device 2 and the optical beacons 6A to 6D, the traffic link information for the optical beacons 6A to 6D to transmit to the vehicle (not shown), the optical beacons 6A to 6D, and the like. 6D includes vehicle information received from a vehicle (not shown).

  Here, for example, the data flow of the communication data when the traffic signal controller 5A transmits the communication data addressed to the signal control device 1 to the terminal router 4A is the same as the case shown in the first embodiment. It is.

  In this system configuration, a bypass line 8 is separately provided between the terminal routers 4A and 4B.

  Here, in the present embodiment, the terminal routers 4A and 4B and the central router 3 have a so-called dynamic IP routing function.

  Between routers having a dynamic IP routing function, information for dynamic routing related to communication paths and the like is exchanged with each other, for example, periodically or in an event-driven manner. The communication can be continued by automatically forming a detour route.

A processing procedure when the terminal router 4A automatically forms a bypass route by the dynamic IP routing function will be described with reference to FIG.
FIG. 16 is an example of a functional block configuration diagram of the terminal router 4A according to the present invention.

The communication monitoring unit 461 monitors whether or not communication with a device connected to the terminal router 4A is possible.
The devices connected to the terminal router 4A are the traffic signal controllers 5A and 5B, the optical beacon 6A, the central router 3, and the terminal router 4B.

  With regard to monitoring of communication availability, for example, a method of monitoring whether or not a health check message periodically transmitted to and received from each connected device normally arrives or a communication carrier signal from a partner device A method for monitoring the presence or the like can be considered.

  The availability of communication can be expressed, for example, as “normal” when communication data can be transmitted and received normally, and “abnormal” when communication data cannot be transmitted and received.

  The dynamic routing information creating unit 471 creates dynamic routing information that the terminal router 4A transmits to the central router 3 and the terminal router 4B.

  In the dynamic routing information, for example, information on the IP address of a device that the terminal router 4A can communicate through any one of the communication paths, the route cost to reach the communicable device, and the like is stored. ing.

  The route cost is, for example, the total number of devices that are routed to reach the communicable device or the section costs that are assigned in advance to all communication segments that are routed to reach the communicable device. Refers to the cost derived from

  Normally, the dynamic routing information is transmitted and received according to a dynamic IP routing communication protocol such as RIP, OSPF, or BGP.

  RIP is a routing method in which the number of devices hopping on a route to a destination device is used as the cost of the route, and a gateway is selected by selecting a route with the smallest number of hops.

  Further, OSPF sets costs for each network interface of routers on the network, and exchanges these as link state information between routers. Each router constructs a link state database based on link state information and the like, and selects a route with the shortest cost to determine a gateway.

  Further, BGP is a protocol used when a plurality of networks are connected to each other by using a set of route information held internally by each network, and based on the exchanged route information. This routing method determines a gateway by searching for a route.

  In the present invention, any protocol may be applied as long as dynamic routing can be performed, as long as the communication path can be switched dynamically.

  If an abnormality occurs in the aggregated line 7A and the communication monitoring unit 461 determines that the communication capability of the transmission unit 411A is “abnormal”, the communication path setting unit 481 sends the information from the routing information table 492 to the transmission unit 411A. Delete related communication path information.

  The communication path information related to the transmission unit 411A indicates, for example, communication path information in which the transmission unit 411A is designated as a gateway.

  By deleting the communication path information, the communication path to the signal control apparatus 1 and the information providing apparatus 2 that have been communicating via the aggregated line 7A is temporarily lost.

  However, after that, the dynamic routing information sent from the terminal router 7B is received, and the communication path setting means 481 uses the received dynamic routing information to allow the detour line 8, the terminal router 4B, and the central router 3 to communicate with each other. It is possible to know that communication with the signal control device 1 and the information providing device 2 is possible via the via.

  Then, the communication path setting unit 481 sets one or a plurality of communication path information indicating the combination of the IP address group of the signal control device 1 or the information providing device 2 and the transmission unit 411D as a gateway in the routing information table 492.

  The gateway of the communication path information may be the IP address of the terminal router 4B existing ahead of the transmission unit 411D.

  In this case, when receiving the communication data addressed to the signal control device 1 or the information providing device 2, the transmission selection unit 491 refers to the communication route information set in the routing information table 492 and sends the communication data. The transmission unit 411D can be selected as the transmission unit to transmit, and the communication data is transmitted to the bypass line 8 by the transmission unit 411D.

  Note that, based on the attribute acquired by the attribute acquisition unit 421, the transmission control unit 431 acquires the priority from the priority table 432, and at least one of the transmission order and the transmission timing is determined according to the acquired priority. For the determination method, the same method as in the first embodiment can be adopted.

  Similarly, at least one of the transmission order and the transmission timing can be determined by a method similar to the method described in the second to fourth embodiments.

  Similarly to the terminal router 4A, the terminal router 4B and the central router 3 also monitor the communication availability, create dynamic routing information and transmit / receive each other, as with the terminal router 4A. Dynamic IP routing can be performed by setting communication path information in the routing information table using dynamic routing information received from other routers.

In this system configuration, the communication speed of the aggregated line 7B is an analog line of 9600 bps, the traffic signal controllers 5A and 5B are U-shaped traffic signal controllers, and the optical beacons 6A to 6D are optical beacons (for AMIS). Think about the case.

  If the aggregated line 7A is disconnected due to an abnormality, the terminal router 4A performs signal control with the traffic signal controllers 5A and 5B and the optical beacon 6A based on the dynamic routing information exchanged between the routers. Communication with the device 1 or the information providing device 2 is continued by dynamically forming a detour route via the terminal router 4A, the detour line 8, the terminal router 4B, the aggregation line 7B, and the central router 3.

  That is, the terminal router 4A that has formed a bypass route by the dynamic IP routing function transmits the communication data from the traffic signal controllers 5A and 5B and the optical beacon 6A to the bypass line 8.

  Then, the terminal router 4B that has received the communication data from the detour line 8 transmits the communication data to the central router 3, and the central router 3 transmits the communication data to the signal control device 1 or the information providing device 2. Will be sent to.

  Accordingly, a total of six terminal devices including the traffic signal controllers 5A and 5B and the optical beacons 6A to 6D communicate using the aggregated line 7B.

  Similar to the sixth embodiment, the communication bandwidth required for the six terminal devices is 12800 bps, which exceeds the communication speed of the aggregated line 7B.

  That is, if the aggregated line 7A is disconnected due to an abnormality and a detour route is formed by the dynamic routing function, a failure may occur in the worst case. Thus, such a system configuration could not be adopted.

  However, by applying the terminal routers 4A and 4B and the central router 3 in the invention shown in the eighth embodiment to this system, for example, the communication data of the traffic signal controllers 5A and 5B are transmitted from the optical beacons 6A to 6D. Can also be avoided in the traffic signal controllers 5A and 5B even in the worst case.

  By performing the priority control, there is a possibility that the communication data of the optical beacons 6A to 6D may fail. However, even if the communication data of the optical beacon is a specific condition, the traffic is The impact on signal control is very small.

  As described above, by utilizing the terminal routers 4A and 4B and the central router 3 in the invention shown in the eighth embodiment, the present invention which has not been considered in the past due to the influence on traffic signal control can be taken. The system configuration as in the eighth embodiment can be adopted, and the number of terminal devices that can be connected under the aggregated line per line can be expanded and operated as compared with the conventional system.

  As described above, if the number of connected terminal devices is expanded, it is possible to reduce the total number of aggregated lines used in the traffic control system while providing a system configuration in which detour lines are provided between terminal routers. Therefore, a system for detouring a communication path by dynamic IP routing corresponding to a communication abnormality can be constructed at a low communication cost and is very useful.

(Ninth embodiment)
Next, a ninth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 17 is an example of a functional block configuration of the traffic signal controller according to the invention of the present embodiment.

  As shown in FIG. 17, the number of terminal devices installed on the road can be reduced by incorporating a router unit having the same function as the terminal router shown in the first to fourth embodiments in the traffic signal controller. Can do.

  In this case, by reducing the number of terminal devices, the number of power lines and communication lines for each terminal device can be reduced, installation work can be facilitated, and installation can be performed without impairing aesthetics.

(Tenth embodiment)
Next, a tenth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 18 is an example of a functional block configuration of the optical beacon according to the invention of the present embodiment.

  As shown in FIG. 18, by incorporating a router unit having the same function as the terminal router shown in the first to fourth embodiments into an optical beacon, the number of terminal devices installed on the road can be reduced. .

In this case, by reducing the number of terminal devices, the number of power lines and communication lines for each terminal device can be reduced, installation work can be facilitated, and installation can be performed without impairing aesthetics.
(Eleventh embodiment)
Next, an eleventh embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 19 is an example of a functional block configuration of the vehicle number reading apparatus according to the invention of the present embodiment.

  As shown in FIG. 19, the number of terminal devices installed on the road can be reduced by incorporating a router unit having the same function as the terminal router shown in the first to fourth embodiments in the car number reading device. Can do.

  In this case, by reducing the number of terminal devices, the number of power lines and communication lines for each terminal device can be reduced, installation work can be facilitated, and installation can be performed without impairing aesthetics.

In addition, about the router part which has a function equivalent to a terminal router, it is not restricted to the said terminal device, You may incorporate in various terminal devices, such as an image type vehicle sensor and a traffic information board.
Also in this case, by reducing the number of terminal devices, the number of power lines and communication lines for each terminal device can be reduced, installation work can be facilitated, and installation can be performed without impairing aesthetics.
(Twelfth embodiment)
Next, a twelfth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 20 is an example of a functional block configuration of the signal control apparatus according to the invention of the present embodiment.

  As shown in FIG. 20, by incorporating a router unit having the same function as the central router of the seventh embodiment into the signal control device, the number of central devices installed in the traffic control center can be reduced.

  In this case, the installation space can be reduced by reducing the number of central devices.

In addition, even when installed outdoors such as on the roof of a traffic control center, the outdoor type central device can be reduced in size by reducing the number of central devices.
(13th Embodiment)
Next, a thirteenth embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 21 is an example of a functional block configuration of the information providing apparatus according to the invention of the present embodiment.

  As shown in FIG. 21, by incorporating a router unit having the same function as the central router of the seventh embodiment into the signal control device, the number of central devices installed in the traffic control center can be reduced.

  In this case, the installation space can be reduced by reducing the number of central devices.

  In addition, even when installed outdoors such as on the roof of a traffic control center, the outdoor type central device can be reduced in size by reducing the number of central devices.

  The terminal router and the central router according to the present invention may be realized by one computer or a plurality of computers.

  Further, the traffic signal controller, the optical beacon, the vehicle number reading device, the signal control device, and the information providing device may be realized by one computer or a plurality of computers.

  Note that the present invention is not construed as being limited to the invention described in the embodiments, and may be other embodiments.

It is the schematic which shows an example of a structure of a traffic control system. It is a figure which shows an example of the functional block structure of a terminal router. It is a figure which shows an example of a priority table. It is a figure which shows an example of the functional block structure of a terminal router. It is a figure which shows an example of a transmission waiting time table. It is a figure which shows an example of the functional block structure of a terminal router. It is a figure which shows an example of the transmission / reception data amount table. It is a figure which shows an example of the functional block structure of a terminal router. It is a figure which shows an example of an allocation bandwidth table. It is the schematic which shows an example of a structure of a traffic control system. It is the schematic which shows an example of a structure of a traffic control system. It is a figure which shows an example of the functional block structure of a central router. It is a figure which shows an example of the functional block structure of a central router. It is a figure which shows an example of the functional block structure of a central router. It is a figure which shows an example of the functional block structure of a central router. It is a figure which shows an example of the functional block structure of a terminal router. It is a figure which shows an example of the functional block structure of a traffic signal controller. It is a figure which shows an example of the functional block structure of an optical beacon. It is a figure which shows an example of the functional block structure of a vehicle number reading apparatus. It is a figure which shows an example of the functional block structure of a signal control apparatus. It is a figure which shows an example of the functional block structure of an information provision apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Signal control apparatus 2 Information provision apparatus 3 Central router 4 Terminal router 5 Traffic signal controller 6 Optical beacon 7 Aggregation line 8 Detour lines 301A-301C, 401A-401C Reception means 311A-311C, 411A-411C Transmission means 321, 421 Attributes Acquisition means 331, 431 Transmission control means 332, 432 Priority table 333, 433 Transmission waiting time table 341, 441 Transmission / reception data amount setting means 342, 442 Transmission / reception data amount table 351, 451 Allocation bandwidth table 461 Communication monitoring means 471 Dynamic Routing information creation means 481 Communication path setting means 391, 491 Transmission selection means 392, 492 Routing information table

Claims (3)

In a traffic control network system adopting DATEX-ASN as a communication protocol of five layers or more of the OSI reference model, a plurality of terminal devices including a central device installed in a traffic control center and a traffic signal controller installed on a road; A router device for traffic control that relays communication data exchanged through an aggregated line laid between the two using an IP routing function,
Receiving means for receiving communication data;
Transmitting means for transmitting communication data received by the receiving means;
Transmission control means for controlling transmission of communication data by the transmission means,
The transmission control means includes
Based on the message ID stored in the communication data received by the receiving means, comprising: a determining means for determining whether the communication data is control instruction information for the traffic signal controller;
If the determination means determines that the instruction information is control, the communication data is transmitted to the transmission means with priority over other communication data.
A traffic control router device. The network system for traffic control is
A plurality of terminal devices including the traffic signal controller are connected to communicate with the central device through the same aggregation line,
The total value of the recommended communication bandwidth allocated according to the device type set in advance for each of these terminal devices is configured to exceed the communication speed of the same aggregated line,
The traffic control router device is:
Relay communication data connected to the same aggregated line and exchanged through the same aggregated line
The traffic control router device according to claim 1. Traffic signal controller, characterized in that for mounting the traffic control for the router device according to claim 1 or 2.

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