JP3494843B2 - Road-to-vehicle wireless communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a road-to-vehicle wireless communication system for performing wireless communication between a wireless device installed on the roadside and a vehicle-mounted device.

[0002]

2. Description of the Related Art VICS (Ve) is a traffic information acquisition means.
hiccle Information and Comm
The beacon system, which has been put into practical use in such applications as a road traffic information communication system, has an antenna installed on the roadside, so if there are multiple lanes, the communication path will be shaded by the effect of a large vehicle. There is a fear.

Therefore, in the case of a system that demands reliability such as automatic toll collection, a wireless system in which there are a plurality of lanes and the shadow of a large vehicle makes it impossible to perform sufficient road-to-vehicle wireless communication. As shown in FIG. 4, the gantry 3 is provided with a plurality of antennas 1 and 2 so that no zones are generated. These antennas 1 and 2 are
As shown in FIG. 5, wireless devices 5 and 6 are connected to each other, and a method is devised in which the wireless devices 5 and 6 are switched and used by the control device 7 by time sharing.

In FIG. 4, reference numeral 4 denotes a wireless device including a plurality of wireless devices and its control device, 8 denotes a communication area for the antenna 1, and 9 denotes a communication area for the antenna 2.

[0005]

However, in the above-mentioned conventional method, as described above, a control for switching control of a plurality of antennas and wireless devices connected to them and those wireless devices by time sharing. Since the system requires a device, its structure has to be complicated.

Further, as the number of lanes of the vehicle increases, it is necessary to arrange more antennas and radio devices in order to solve the above-mentioned problems, and the problem becomes more serious. The present invention eliminates the above problems,
It is an object of the present invention to provide a roadside-vehicle wireless communication system that can simplify roadside-side antennas and wireless devices and can reliably perform roadside-vehicle wireless communication.

[0007]

In order to achieve the above object, the present invention provides [1] a road-to-vehicle wireless communication system for performing wireless communication between a wireless device installed on a roadside and an in-vehicle device, A leaky cable type antenna is arranged along a structure that is arranged in the transverse direction of a road that the user has, and a single wireless device that is connected to the leaky cable type antenna and is arranged on the roadside is provided. .

[2] In the road-vehicle radio communication system according to [1], the leaky cable type antenna is a cable type antenna having a waveguide with a leak slit. [3] In the road-vehicle wireless communication system according to [1], the leaky cable antenna is used for wireless communication for fee collection processing. [4] In the road-vehicle wireless communication system according to [1] above, the leaky cable antenna is used for wireless communication with a vehicle for various data transmission processing.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of a road-vehicle wireless communication system showing an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of its antenna and a wireless device. As shown in these figures, a gantry 11 constructed to cross a road 10 having a plurality of lanes (three lanes are shown here, but is not limited thereto) is provided, and a gantry 11 is provided on the roadside. The leaky cable (leaky coaxial cable or leaky waveguide) type antenna 12 laid along the gantry 11 is connected to the antenna terminal of the wireless device 16 arranged to form a uniform wireless zone 15 in the lane direction. Reference numeral 13 is a terminal device of the leaky cable type antenna.

With such a configuration, as shown in FIG. 2, the configuration of the radio device 16 only needs to include the radio device 17 connected to the leaky cable antenna 12. FIG. 3 is a partial perspective view showing an example of a leaky cable type antenna of a road-vehicle wireless communication system according to an embodiment of the present invention. As shown in this figure, instead of the conventional antenna, a leaky cable antenna 21 having a waveguide 22 with a slit in which a leak slit 22A is formed is laid along the gantry 11 (see FIG. 1).

With this configuration, reliable road-to-vehicle communication can be performed with a plurality of vehicles traveling in a plurality of lanes directly below the gantry. The road-to-vehicle wireless communication system described above is suitable for being installed at a tollgate where an automatic toll collection system is adopted, but it cannot be used for constructing a spot-type wireless communication zone for a vehicle navigation system. Needless to say.

As described above, since the leaky cable type antenna is used to form the spot type wireless communication zone, it is possible to eliminate the blind spot of the wireless communication between the wireless device installed on the roadside and the vehicle-mounted device. , ITS (Int
Elligent Transport System
s: Intelligent road traffic system) can establish road-to-vehicle wireless communication.

Further, reliable road-to-vehicle communication can be performed with a plurality of vehicles traveling in a plurality of lanes directly under the gantry. Further, since a control device for switching a plurality of antennas arranged on the roadside is not required, the configuration of the wireless device is simplified and the reliability is improved. Further, even if the number of lanes changes, there is no need to change the device configuration.

Further, the wireless zones (multi-lane wireless zone, in-route wireless zone, preliminary wireless zone, billing wireless zone) in the automatic toll collection system are surely secured.
Moreover, it can be constructed at low cost. Further, by constructing this multi-lane compatible wireless zone, it can be further expanded from the automatic toll collection system and used as a means for receiving traffic information for vehicle navigation.

That is, information (VICS, etc.) related to road traffic can be accurately transmitted to a lane from a leaky cable type antenna laid across a road to assist (assist) smooth vehicle operation. . The present invention is not limited to the above-mentioned embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.

[0016]

As described in detail above, according to the present invention, the following effects can be achieved. (1) According to the first aspect of the invention, since the leaky cable type antenna is used to configure the spot type wireless communication zone, it is possible to perform road-vehicle wireless communication for ITS.

Further, reliable road-to-vehicle communication can be performed with a plurality of vehicles traveling in a plurality of lanes directly under the gantry. Further, since it is not necessary to switch a plurality of antennas arranged on the road side, the configuration is simplified and the reliability is improved. (2) According to the second aspect of the present invention, the radio zone is not shaded by a large vehicle, and reliable road-to-vehicle communication can be performed with a plurality of vehicles traveling in a plurality of lanes.

(3) According to the third aspect of the present invention, the multi-lane compatible wireless zone in the automatic fee collection system can be constructed reliably and at low cost. (4) According to the invention described in claim 4, it can be further expanded from the automatic toll collection system and used as the road-vehicle communication means for ITS.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a road-vehicle communication system showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an antenna and a wireless device of a road-to-vehicle wireless communication system according to an embodiment of the present invention.

FIG. 3 is a partial perspective view showing an example of a leaky cable antenna of the road-vehicle wireless communication system according to the embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a conventional road-vehicle wireless communication system.

FIG. 5 is a schematic configuration diagram of an antenna and a wireless device of a conventional road-vehicle wireless communication system.

[Explanation of symbols]

10 Road with Multiple Lanes 11 Gantry 12 Leakage Cable Type Antenna 13 Termination Device 15 Radio Zone 16 Radio Equipment 17 Located on Roadside 17 Radio Device 21 Leaky Cable Type Antenna 22 with Waveguide with Slit 22 Waveguide with slit 22A Leakage slit

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G08G 1/00-1/16 G07B 15/00 510 H04B 5/00 H04B 7/26

Claims (4)

(57) [Claims] 1. A road-to-vehicle wireless communication system for performing wireless communication between a wireless device installed on a roadside and an in-vehicle device,
(A) arranging a leaky cable antenna along a structure arranged transversely to a road having multiple lanes, (b)
A road-vehicle wireless communication system comprising a single wireless device connected to the leaky cable type antenna and arranged on the roadside. 2. The road-to-vehicle wireless communication system according to claim 1, wherein the leaky cable type antenna is a cable type antenna having a waveguide with a leaky slot. 3. The road-to-vehicle wireless communication system according to claim 1, wherein the leaky cable antenna is used for wireless communication for charge collection processing. 4. The road-to-vehicle wireless communication system according to claim 1, wherein the leaky cable antenna is used for wireless communication for various data transmission processing with a vehicle.