JP2008205765A - Wireless communication system and device, ip router device, and traffic signal controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication system which diminishes a risk of causing communication failure by disturbance wave caused by disturbance waves in a zone of the wireless communication when devices are connected by wireless communication. <P>SOLUTION: In a traffic control system, communication data on device conditions and controls are exchanged among a traffic signal controller 3 disposed on a road, an optical beacon 4 or the like and a central device 8 installed in a traffic control center. When a first wireless device 1 transmits the communication data to a second wireless device 2, the first wireless device monitors noise characteristics of wireless communication channels A to C to obtain a mean value and minimum value of a possible communication velocity. Then, the first wireless device 1 obtains an attribute of the communication data to obtain priority depending on the attribute from a priority table 142 and then transmits by selecting an appropriate wireless communication channel based on the obtained mean value of the communication velocity, or the obtained priority. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wireless communication system for performing communication between a plurality of devices installed on a road.

  In the traffic control system, the construction of a network by wireless communication is being studied for the purpose of reducing the cost of installation work and facilitating maintenance, and the wireless communication device is applied to communication between terminal devices for the traffic control system. Examples are increasing.

As a wireless communication technique, for example, Patent Document 1 introduces a technique for performing wireless communication using a plurality of wireless lines (wireless communication paths) by a multilink method.
The multi-link method uses two or more wireless lines that adopt the same communication method when performing communication between two devices by wireless, and divides communication data into each wireless line and transmits it simultaneously. It is a method to speed up.

Also, in recent traffic control systems, network systems using the Internet protocol (hereinafter referred to as IP) have become widespread in the network layer (third layer) of the so-called OSI reference model. A UD transmission method that employs Datex-ASN for the seventh to seventh layers is standardized.
The communication format and procedure details of the UD type transmission system are described in a standard document issued by the New Traffic Management System Association (hereinafter referred to as UTMS Association).

JP 2000-174770 A

In the multilink method, a plurality of wireless lines to be used use the same frequency band and adopt the same communication method. For this reason, there is a high possibility that all the radio lines cannot be used simultaneously when receiving interference by an interference wave.
Moreover, even if the plurality of wireless lines employ different communication methods (communication procedures), if the frequency band is the same, all the wireless lines are simultaneously used by the interference wave in the same way. become unable.

  Therefore, an object of the present invention is to provide a wireless communication system that reduces the risk of communication failure due to jamming waves.

  A wireless communication system of the present invention includes a first wireless communication device and a second wireless communication device installed on a road, and a first wireless communication path is provided between the first wireless communication device and the second wireless communication device. And at least two wireless communication paths including the second wireless communication path, and the communication methods employed for the first wireless communication path and the second wireless communication path use different frequency bands.

According to the present invention, even when one wireless communication path falls into a state incapable of communication due to interference such as an interference wave, communication is continued using another wireless communication path having a different frequency band. be able to.
When wireless communication is performed between two devices, each of the two devices has a corresponding wireless communication medium, and the wireless communication formed between the pair of media is wireless communication. A route. That is, when there are three wireless communication paths between the two devices, each of the two devices has three corresponding wireless communication media.
In this case, each medium may be configured to share the antenna portion. That is, radio waves of different radio communication paths may be received by the same antenna, and each medium may extract radio waves for each radio communication path from the antenna.

In addition, "different frequency bands" here means that the frequency bands are separated to such an extent that the wireless communication state differs, and in principle, the frequency bands are distinguished based on the wavelength of the radio signal. . That is, a very long wave band (frequency 3 to 30 kHz, wavelength 10 to 100 km), long wave band (frequency 30 to 300 kHz, wavelength 1 to 10 km), medium wave band (frequency 300 kHz to 3 MHz, wavelength 100 m to 1 km), short wave band (frequency 3 to 30 MHz, wavelength 10 to 100 m), ultra high frequency band (frequency 30 to 300 MHz, wavelength 1 to 10 m), ultra high frequency band (frequency 3000 MHz to 3 GHz, wavelength 10 cm to 1 m), microwave band (frequency 3 to 30 GHz, wavelength 1) -10 cm), millimeter wave band (frequency 30 to 300 GHz, wavelength 1 mm to 1 cm), submillimeter wave band (frequency 300 GHz to 3 THz, wavelength 0.1 to 1 mm), and the like. When the distance between the wireless devices is long, the wireless communication state may vary greatly even if the wavelength difference is small because the attenuation of the wireless signal is large. This is because the propagation loss in the most basic free space of a radio signal increases in proportion to the square of the wavelength. Therefore, the classification can be further defined in accordance with the system configuration and application to be applied. For example, a region having a high frequency in the ultra-high frequency band is classified as a quasi-microwave band (frequency 1 to 3 GHz), and a region having a high frequency in the microwave band is classified as a quasi-millimeter wave band (frequency 10 to 30 GHz). You can also
The fineness and degree of the classification can be changed according to the occupied bandwidth of the communication system and the magnitude of the antenna power.

The first wireless communication device of the present invention further includes wireless environment state acquisition means for acquiring wireless environment states of a plurality of wireless communication paths formed between the second wireless communication device and the first wireless communication device. When the communication device transmits communication data addressed to the second wireless communication device, it is preferable to select and transmit at least one of the plurality of wireless communication paths based on the acquired wireless environment state ( Claim 2).

  The wireless environment state is at least one of a desired wave reception level, an interference wave reception level, a noise level, a direct wave level, and a multipath wave level, and the first wireless communication device Based on the communication speed acquisition means for acquiring the communication speed of the plurality of wireless communication paths, the average value, the maximum value, the minimum value and the standard of the acquired communication speed of the plurality of wireless communication paths within a predetermined time Preferably, at least one of the plurality of wireless communication paths is selected and transmitted based on at least one of the deviations (claim 3).

  According to these inventions, it is possible to acquire radio environment states of a plurality of existing radio communication paths and select an appropriate radio communication path based on the radio environment conditions. Further, by selecting a route based on the average value of the communication speed obtained from the wireless environment state, it becomes possible to make a detailed route selection according to the intention of the person who manages the communication network.

  In addition, at least one of the communication methods of each wireless communication path may be an orthogonal frequency multiplexing method.

  In the orthogonal frequency multiplexing method, data can be transmitted and received by dividing a certain frequency band into a plurality of subcarriers. For example, even when the radio environment state of a certain frequency band deteriorates, the radio environment within that frequency band also Communication can be continued by utilizing subcarriers in a relatively good state.

Further, for example, the orthogonal frequency multiplexing method is adopted in any of the two wireless communication paths, and both wireless communication paths are used at the same time. For example, three subcarriers are used in one of the wireless communication paths. If the data transmission is transferred to the other wireless communication path according to the deterioration of the wireless environment state, three unused subcarriers of the other wireless communication path are allocated. can do.
This is very useful because it is possible to change the wireless communication path without affecting the existing data transmission / reception processing performed on the other wireless communication path.

  Further, the first wireless communication device has attribute acquisition means for acquiring an attribute of the communication data, and is acquired when the first wireless communication device transmits communication data to the second wireless communication device. It is also possible to select at least one of the plurality of wireless communication paths based on the attribute.

  In this case, the first wireless communication device has a priority table in which a priority is set for each attribute, and is acquired when the first wireless communication device transmits communication data to the second wireless communication device. Preferably, at least one of the plurality of wireless communication paths is selected and transmitted according to the priority of the attribute.

  Further, the attribute includes a protocol type indicating a communication protocol type of communication data, a data type indicating a type of communication data, a transmission source device type indicating a type of communication data transmission source device, and a communication data transmission destination device type. Destination device type indicating communication request presence / absence indicating whether communication data requests a response, receiving means identification number indicating a receiving means that has received communication data, transmission indicating transmitting means for transmitting communication data It may be at least one of means identification number, communication data transmission source IP address, communication data transmission source port number, communication data transmission destination IP address, and communication data transmission destination port number. .

  According to these inventions, a plurality of existing wireless communication paths can be selectively used according to communication data attributes such as a data type and a transmission source device type. In this case, a priority can be given to the attribute, and a route can be selected according to the priority. Further, it is possible to select a transmission path for each communication data based on both the wireless communication state and the like and priority, and in this case, it is possible to select a more appropriate path.

  The wireless communication device of the present invention is a first wireless communication device used in the wireless communication system (claim 8).

  Moreover, the road IP router apparatus of this invention incorporates said 1st radio | wireless communication apparatus (Claim 9).

  The traffic signal controller of the present invention includes the first wireless communication device (claim 10).

  The vehicle detector of the present invention includes the first wireless communication device (claim 11).

According to these inventions, since the first wireless communication device is applied to the wireless communication section of the communication network and a wireless communication path with a favorable wireless environment state can be selected and communicated, the risk of communication failure can be reduced. it can.
In addition, by installing the wireless communication device in the road IP router device or the traffic signal controller, the installation work is facilitated and the aesthetic appearance is improved.

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

The central device 8 installed in the traffic control center is connected to the traffic signal controller 3, the optical beacon 4 and the vehicle number reading device 5 installed on the road, and information on the device status of each device and Communication data related to instructions related to the control method is transmitted and received.
These communication data are exchanged via the central router 7, the wired communication line, the terminal router 6, the second wireless communication device 2, and the first wireless communication device 1.

In this case, the first wireless communication device 1 and the second wireless communication device 2 are provided with antennas 1A to 1C and 2A to 2C for wireless communication, respectively, and wireless communication paths A, B, and C are provided between the antennas. And the communication data is transmitted and received.
In these wireless communication paths A, B, and C, communication systems using different frequency bands fa, fb, and fc are employed.
Note that relay stations for relaying wireless communication may be provided in the wireless communication paths A to C.

FIG. 2 is a block diagram illustrating an example of a functional configuration of the first wireless communication device 1.
The terminal communication unit 101 transmits / receives communication data to / from the traffic signal controller 3, the optical beacon 4, and the car number reading device 5.
In this case, the received communication data is transmitted to the second wireless communication apparatus 2 by at least one of the wireless communication means A to C selected by the wireless selection means 131.
In the transmission, the communication data may be divided into two and each of them may be transmitted by the wireless communication means A and B.

Information to be transmitted / received by the traffic signal controller 3 includes signal control execution information indicating a history of the traffic signal controller 3 operating in a predetermined period, and a signal lamp color transmitted from the central device 8 to the traffic signal controller 3. There is signal control command information that is an instruction related to display.
Information transmitted and received by the optical beacon 4 includes vehicle information transmitted to the central device 8 after the optical beacon 4 is received from the vehicle, and VICS information provided to the vehicle by the central device 8 via the optical beacon 4 ( Traffic information and travel time information).
The information transmitted and received by the vehicle number reading device 5 includes information on the vehicle number read by the vehicle number reading device 5 and the like.

First, a procedure in which the wireless selection unit 131 selects a wireless communication unit will be described.
The wireless environment state acquisition unit 111 constantly monitors the desired wave reception level, interference wave reception level, noise level, direct wave level, and multipath wave level of each of the wireless communication units A to C. Based on these, the C / N value that is the noise characteristic, the D / U value that is the ratio of the level of the desired wave and the interference wave, and the presence or absence of the carrier due to carrier sense are calculated as needed.
Based on these, the communication speed acquisition unit 121 acquires a communication speed that can be transmitted and received by the wireless communication paths A to C by link adaptation or the like.
Further, the obtained communication speed is transmitted to the second wireless communication apparatus 2.
Note that the communication speed may be obtained by separately obtaining a value measured by another device such as the second wireless communication device 2 through communication.

  Since the acquired communication speed fluctuates depending on the weather on the road, traffic conditions, time zones, etc., the average value, maximum value, minimum value, and standard deviation for a predetermined period are calculated for each predetermined time. And stored in a storage unit (not shown) such as a memory, and the quality of each wireless communication path is determined based on these values.

  For example, at a certain time, the average value of the communication speed of the wireless communication path A is 100 kbps, the average value of the communication speed of the wireless communication path B is 10 kbps, and the average value of the communication speed of the wireless communication path C is 1 kbps. When the size of the communication data to be processed is 100 kilobits, the required communication time when each wireless communication path is used is calculated as 1 second for A, 10 seconds for B, and 100 seconds for C.

In this case, if the transmission time-out time of the communication data is 5 seconds, the radio selection unit 131 selects the radio communication unit A that can communicate within the time-out period, and transmits the communication to the second radio communication device via the radio communication path A. Send data.
In this case, the communication modules of the wireless communication means B and C that are not used for communication may be operated in the sleep mode or the power save mode to save power.

  Further, for example, when the size of communication data to be transmitted is 110 kilobits and the transmission timeout time is 1 second, the wireless selection means 131 sends 100 kilobits of data to the wireless communication means A and 10 kilobits to the wireless communication means B, respectively. By distributing and transmitting, communication data can also be transmitted within the timeout time.

  As described above, it is possible to acquire the respective communication speeds for a plurality of wireless communication paths, select the wireless communication means to be used for communication from the data amount of the communication data to be transmitted, the transmission conditions, etc., and transmit It becomes.

For example, the wireless communication means A uses a specified low power communication system that uses a 400 MHz band, which is a specific low power standard, the wireless communication means B uses a wireless LAN system that uses a 2.4 GHz band, and the wireless communication means C uses a 5 GHz band. In the case of the wireless LAN method to be used, if communication by the Bluetooth method of 2.4 GHz band is performed at the same place, the wireless environment state of the wireless communication means B deteriorates due to the influence of the interference by the Bluetooth method, Communication speed decreases or communication is impossible.
In this case, in a multilink that uses a plurality of 2.4 GHz band wireless communication paths, since all the wireless communication paths are affected by the interference, it is difficult to continue the communication. It is possible to continue communication using A and C other than those, which is very useful.
That is, by securing a plurality of wireless communication paths in different frequency bands, it is possible to disperse the risk of communication failure and realize wireless communication with excellent environmental resistance.

The present invention is extremely effective when applied to a traffic control system as shown in the first embodiment, particularly when communication is performed with a traffic signal controller.
Multiple traffic signal controllers installed along urban trunk roads are centrally controlled by a central device, and are controlled in real time so that traffic signals at adjacent intersections operate systematically. Yes.
Therefore, when communication between a specific traffic signal controller and the central device is interrupted due to the influence of an interference wave, only the traffic signal controller is excluded from control. There is a risk of serious traffic congestion on urban main roads due to failure to operate.
According to the present invention, wireless communication paths using a plurality of different frequency bands can be secured, so that the risk of interruption of traffic signal controller communication can be reduced, and the above systematic operation can be ensured. .

(Second Embodiment)
FIG. 3 is a block diagram illustrating an example of a functional configuration of the first wireless communication apparatus 1 that is different from the first embodiment.
The difference from the first embodiment is that an attribute acquisition unit 141 and a priority table 142 are provided.

The operations of the terminal communication unit 101, the wireless environment state acquisition unit 111, the communication speed acquisition unit 121, and the wireless communication units A to C are the same as those in the first embodiment.
In the second embodiment, the attribute acquisition unit 141 acquires the attribute of the communication data received by the terminal communication unit 101, and acquires the priority of the communication data from the priority table 142 based on the attribute.

  The attribute indicates a protocol type indicating the type of communication protocol of communication data, a data type indicating the type of communication data, a source device type indicating the type of the transmission source device of communication data, and a type of destination device of the communication data. Type of destination device, 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 identification indicating transmitting means for transmitting communication data It is at least one of a 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 indicates, for example, whether the communication data is an end application message or other data. In the case of an end application message, the data type further indicates the type of the message such as signal control execution information or vehicle information.
The data type may be a type indicating a category of information such as whether the communication data is data related to signal control or data related to VICS.

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 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. The details of the message ID are described in the standard issued by the UTMS Association.

  For example, when the first wireless communication apparatus 1 receives signal control execution information from the traffic signal controller 3, the attribute acquisition unit 141 acquires “signal control execution information” as an attribute of the received communication data, and then Is obtained from the priority table 142 (see FIG. 4). In this case, the priority of the acquired communication data is “high”.

On the other hand, as in the first embodiment, the communication speed acquisition unit 121 acquires the average value and the minimum value of the communication speed of each wireless communication path.
For example, the average value of the acquired wireless communication path A is 100 kbps, the minimum value is 0 kbps, the average value of the communication speed of the wireless communication path B is 10 kbps, the minimum value is 8 kbps, and the average value of the communication speed of the wireless communication path C is It is assumed that the minimum value is 1 kbps and 0 kbps.

In this case, the wireless selection unit 131 determines as follows. Although the wireless communication path A has a high average communication speed, communication may be impossible (minimum value 0). On the other hand, the average communication speed of the wireless communication path B is lower than A, but communication is not possible. In some cases, the wireless communication path C is inferior to A or B.
That is, the wireless selection unit 131 assigns B, A, and C as wireless communication paths.

  In the above case, since the wireless selection means 131 is communication data with a high priority, it is determined that the wireless communication path B with the highest priority should be selected and transmitted, and the wireless communication means B is selected. Then, the signal control execution information is transmitted.

  Also, for example, when vehicle information with the priority “standard” is received under the same communication speed, the wireless communication means A with the second rank is selected, and the compressed image information with the priority “low” is selected. If received, the wireless communication means C with the third rank is selected so that other communication data with a higher priority can use the wireless communication means A and B.

As described above, the first wireless communication device 1 shown in the second embodiment can select and transmit an appropriate wireless communication path based on both the wireless communication speed and the priority of communication data. Is even more useful.
By doing so, it is possible to pick up communication data to be transmitted and received preferentially and reliably, and to increase the probability that the communication data reaches the counterpart device.

  In determining the rank, for example, a method may be used in which the rank is determined based on the standard deviation of the communication speed or the difference between the maximum value and the minimum value, with emphasis on the stability of the communication quality of each wireless communication path. However, a method may be used in which the order is determined based only on the minimum value of the communication speed, placing importance on the certainty of arrival of information in the worst case. In addition, it may be a method of determining the rank based on the index value using a value obtained by adding a predetermined weight to an average value, a standard deviation, or the like as an index, and depending on a place to be installed, The weight may be changed.

When the present invention is applied to a traffic control system as shown in the first embodiment, a traffic signal controller and a device other than a traffic signal controller such as an optical beacon or a car number reader use the same wireless device. This is extremely effective when communicating with each other.
Even when communication data is exchanged in a wireless communication environment where the quality of wireless communication is not sufficient, communication data related to traffic signal controllers can be transmitted and received with priority over data of other devices. Because it becomes.
That is, according to the present invention, it is possible to reduce the risk of missing communication data of the traffic signal controller, and to ensure the above-described systematic operation.

  In the second embodiment, an example in which a data type is adopted as an attribute of communication data has been described. However, the same applies depending on, for example, whether the device type of the transmission source is a traffic signal controller or other device. The wireless communication path may be selected by this method. Also, depending on the type of communication protocol, for example, Datex-ASN communication data may be given priority over other protocols (for example, Telnet, HTTP, etc.), or communication data that requires a response from the transmission destination device may be displayed. You may make it give priority.

Also, a priority table may be defined so that a priority is associated by combining a plurality of these attributes.
For example, if the communication protocol is Datex-ASN and the destination device type is a traffic signal controller, the highest priority is given. Conversely, the communication protocol is other than Datex-ASN and the destination device type is traffic. Other than the signal controller, the priority may be set to the lowest.

In the second embodiment, the method for selecting an appropriate wireless communication path based on both the wireless communication speed and the priority of communication data has been described. A method is used in which the order of .about.3 is given, communication data having a high priority is communicated using the first wireless communication means, and communication data having a low priority is communicated using the third wireless communication means. May be.
When the communication speed and quality fluctuation of the wireless communication means are small, the same effect can be obtained even with the above method. Further, if there is a difference in the quality of wireless communication between a time zone with a lot of traffic and a time zone with a small amount of traffic, the order may be changed according to the time zone.

The priority table 142, the order, and the like are stored in a storage unit (not shown) such as a ROM held by the first wireless communication apparatus 1, but it is very convenient if they can be rewritten from the outside. It is.
For example, when the type of the terminal device connected to the first wireless communication device 1 or the environment of the wireless communication changes, or when the first wireless communication device 1 is moved to another point, the priority is accordingly changed. Etc. can be rewritten and used.
Further, these values are even more convenient if they can be rewritten remotely from the traffic control center without going to the installation site of the first wireless communication device 1.

In addition, when the first wireless communication device 1 receives the signal control execution information with the priority “high” and the compressed image information with the priority “low” at the same time, there is only one wireless communication path that can communicate. If the communication speed is low, the signal control execution information may be transmitted preferentially and the compressed image information may be discarded.
In other words, the lower priority communication data that cannot clearly be transmitted so as to satisfy the predetermined condition such as the timeout time is discarded, and the other higher priority communication data is surely received by the partner device. Can be reached.
In this case, the transmission source device or the transmission destination device may be notified that the communication data has been discarded. By doing so, the transmission source device that has received the information that it has been discarded can retransmit the communication data after a predetermined period, which is useful.

In addition, it is more useful to incorporate the first wireless communication device 1 shown in the first and second embodiments into a vehicle detector such as the traffic signal controller 3 and the optical beacon 4 or a terminal router (IP router).
When there are a plurality of devices to be installed on the road, by installing these devices together in one housing, the installation work can be facilitated and the cost can be reduced, and the aesthetics are excellent.

In addition, there is a software radio technology in which software corresponding to a plurality of different communication schemes is downloaded to one radio communication means and switched to operate. In this case, the plurality of communication schemes use different frequency bands. If this method is used, it is possible to avoid interference due to interference waves.
However, in the software defined radio technology, when switching the communication method, the time required for detecting that it is disturbed and the overhead time for downloading the software are required, so there is a problem that the communication efficiency is lowered, Cannot communicate using multiple different frequency bands at the same time.
In the present invention, it is possible to constantly monitor wireless environment states of a plurality of different frequency bands, select an appropriate communication path without waste according to the state, etc., and simultaneously communicate using a plurality of frequency bands. This is advantageous.

Further, even when the wireless communication paths A to C shown in the embodiments are in a frequency band close to each other, the present invention can be applied as a different frequency band. If the time period, rate, and characteristics of the wireless environment conditions of the wireless communication paths A to C are different from each other by a predetermined amount or more, it is possible to select an appropriate wireless communication path and transmit / receive data each time. It is.
For example, the wireless communication path A is a very close frequency band, such as 1.2 GHz band, B is 2.4 GHz band, and C is 2.5 GHz band, and A is a stable communication regardless of time zone. Although it is possible, when B is in the daytime time zone and C is in the nighttime, the wireless environment state deteriorates, the wireless communication path is switched according to the present invention, so that wireless communication with excellent environmental resistance is possible. Can be realized.

  Further, when the width of the occupied bandwidth of each wireless communication path and the magnitude of the antenna power are different, the wireless communication paths can be switched and used based on these characteristics. For example, if the occupied bandwidth of A is 20 MHz, the antenna power is 10 mW, the occupied bandwidth of B is 5 MHz, and the antenna power is 100 mW, if both frequency utilization efficiencies are equal, A is a high-speed transmission property, B Has a different property of high reliability due to the line margin, and therefore a difference occurs in the change in the wireless environment state between A and B. Therefore, by switching and using the wireless communication path according to the property of each wireless communication path, it is possible to realize wireless communication with excellent environmental resistance.

  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 description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows an example of the whole structure of the traffic control system containing the radio | wireless communications system which concerns on this invention. 2 is a diagram illustrating an example of a functional block configuration of a first wireless communication device 1. FIG. 2 is a diagram illustrating an example of a functional block configuration of a first wireless communication device 1. FIG. It is a figure which shows an example of a priority table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st radio | wireless communication apparatus 2 2nd radio | wireless communication apparatus 1A-1C, 2A-2C Wireless communication antenna 3 Traffic signal controller 4 Optical beacon 5 Car number reading apparatus 6 Terminal router 7 Central router 8 Central apparatus 101 Terminal communication means 111 Wireless environment state acquisition means 121 Communication speed acquisition means 131 Wireless selection means 141 Attribute acquisition means 142 Priority table

Claims (11)

A wireless communication system including a first wireless communication device and a second wireless communication device installed on a road,
Between the first wireless communication device and the second wireless communication device, there are at least two wireless communication routes including a first wireless communication route and a second wireless communication route,
The wireless communication system characterized in that communication systems employed for the first wireless communication path and the second wireless communication path use different frequency bands. The first wireless communication device is:
Wireless environment state acquisition means for acquiring wireless environment states of a plurality of wireless communication paths formed between the second wireless communication device,
When the first wireless communication apparatus transmits communication data addressed to the second wireless communication apparatus, the first wireless communication apparatus selects and transmits at least one of the plurality of wireless communication paths based on the acquired wireless environment state The wireless communication system according to claim 1. The wireless environmental state is
At least one of a desired wave reception level, an interference wave reception level, a noise level, a direct wave level, and a multipath wave level;
The first wireless communication device is:
Communication speed acquisition means for acquiring communication speeds of the plurality of wireless communication paths based on the wireless environment state;
Selecting at least one of the plurality of wireless communication paths based on at least one of an average value, a maximum value, a minimum value, and a standard deviation of communication speeds of the plurality of wireless communication paths acquired within a predetermined time. The wireless communication system according to claim 2, wherein the wireless communication system transmits the data.   4. The wireless communication system according to claim 1, wherein at least one of the communication methods of each wireless communication path is an orthogonal frequency multiplexing method. 5. The first wireless communication device is:
Having attribute acquisition means for acquiring the attribute of the communication data;
When the first wireless communication device transmits communication data addressed to the second wireless communication device, at least one of the plurality of wireless communication paths is selected based on the acquired attribute. The radio | wireless communications system in any one of Claims 1 thru | or 4. The first wireless communication device is:
It has a priority table that sets the priority for each attribute,
When the first wireless communication apparatus transmits communication data addressed to the second wireless communication apparatus, at least one of the plurality of wireless communication paths is selected and transmitted according to the priority of the acquired attribute The wireless communication system according to claim 5, wherein: The attribute indicates a protocol type indicating the type of communication protocol of communication data, a data type indicating the type of communication data, a source device type indicating the type of the transmission source device of communication data, and a type of destination device of the communication data. Type of destination device, 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 identification indicating transmitting means for transmitting communication data At least one of a 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;
The wireless communication system according to claim 5 or 6.   A wireless communication apparatus used in the wireless communication system according to claim 1.   A road IP router apparatus incorporating the first wireless communication apparatus according to claim 8.   A traffic signal controller incorporating the first wireless communication device according to claim 8.   A vehicle sensor incorporating the first wireless communication device according to claim 8.

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