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Path shop communication system, onboard device and device on road

An on-board device and inter-vehicle communication technology, which is applied to communication between multiple stations, wireless communication, transmission system, etc., can solve the problems of time-consuming, processing as illegal vehicles, reducing the sufficient time for communication retrial, and achieve fast processing. , to ensure the effect of sufficient time

Inactive Publication Date: 2002-05-29
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Then, in the case of the former, in a vehicle equipped with only an on-board device corresponding to either method, the convenience of being able to collect a toll without stopping is not only damaged by the behavior of crossing the above-mentioned boundary, but also because the on-road device that is different from the communication method cannot communication, there is such a problem: such on-road devices have the potential to treat it as an offending vehicle
[0011] However, in the in-vehicle device that can support ETC applications and new applications, compared with only executing ETC applications, it is necessary to search for two additional frequency bands, and it takes time to specify the frequency bands to be used, that is, it is necessary to search for five more frequency bands. The problem of reducing the sufficient time for communication retry and reducing the reliability of communication

Method used

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  • Path shop communication system, onboard device and device on road
  • Path shop communication system, onboard device and device on road
  • Path shop communication system, onboard device and device on road

Examples

Experimental program
Comparison scheme
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no. 1 example

[0076] figure 1 In the road-to-vehicle communication device of the first embodiment, the road-to-vehicle communication device that provides the ETC application through the active road-to-vehicle communication and the on-road device that provides the ETC application through the passive road-to-vehicle communication is mixed. A block diagram of the configuration of an on-vehicle device for on-road device communication.

[0077] Both the road-to-vehicle communication in the active mode and the road-to-vehicle communication in the passive mode use Figure 22 A well-known communication frame is shown.

[0078] That is, in the road-to-vehicle communication of the active method, three message data slots (MDS) are prepared so as to be able to communicate with three vehicle-mounted devices at the same time, and the allocation status of the MDS is notified to the vehicle-mounted device by an on-road device preceding the MDS. The frame control message channel (FCM) of the MDS and the ...

no. 2 example

[0113] Next, a second embodiment will be described.

[0114] Figure 6 It shows that in the road-to-vehicle communication device of the second embodiment that mixes the on-road device that performs road-to-vehicle communication in an active manner and the on-road device that performs road-to-vehicle communication in a passive manner, it is installed on each lane of a toll station on a toll road A block diagram of the structure of the on-the-road device.

[0115] Figure 6 Among them, (a) is a common on-road device that can communicate with any type of vehicle-mounted device, (b) is an active dedicated on-road device that only communicates with an active type of vehicle-mounted device, and (c) is an on-road device that only communicates with a passive Passive dedicated on-road device for in-vehicle device communication. The shape of the communication frame and the frequency band used at the same time are the same as those of the first embodiment.

[0116] First, if Figure...

no. 3 example

[0171] Next, a third embodiment will be described.

[0172] Figure 16 In each lane of the tollbooth of the toll road in the road-to-vehicle communication system of this embodiment, which is a mixture of vehicle-mounted devices that perform road-to-vehicle communication in an active mode and vehicle-vehicle devices that perform road-to-vehicle communication in a passive mode A block diagram of the structure of the set-up on-the-road device. As shown in the figure, in this embodiment, the on-road device 30 has a passive transmission antenna 31a, a reception antenna 31b, and an active transmission and reception antenna 32. And, have: directional coupler 33, separate the transceiving signal to transmitting and receiving antenna 32; As through these antennas 31a, 31b, 32 transmit and receive signals, carry out the shared communication unit 35 of the roadside communication device with the vehicle-mounted device's road-to-vehicle communication; according to The switching signal fr...

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Abstract

To provide an on-vehicle device which can deal with any of two systems (an active system and a passive system) used in a communication between road and vehicles, to provide an on-road apparatus and to provide a communication system between road and vehicles. The on-vehicle device scans the downlink of the active system, and it scans a frequency band used in the passive system. When the electric-field strength of received radio waves is a preset lower-limit value or more, the on-vehicle device is regarded as having marched into the communication area of the on-vehicle apparatus, and its frequency is stored (S110 to S130). When the stored frequency belongs to a frequency band exclusively used in the passive system, a passive communication part is immediately started, and a communication by the passive system is started. When the stored frequency belongs to a frequency band used in common by both systems, the active communication part is first started, and a communication by the active system is tried. When the content of a received signal cannot be analyzed, the passive communication part is started so as to be changed over to the communication by the passive system (S140 to S190).

Description

technical field [0001] The present invention relates to a road-to-vehicle communication system that mixes two methods (passive and active) used in road-to-vehicle communication, and vehicle-mounted devices and on-road devices that can support the two methods and various applications through road-to-vehicle communication. Background technique [0002] Originally, DSRC (Dedicated Short Range Communication: Dedicated Short Range Communication) is known as a communication method for realizing automatic toll collection (ECT) of toll roads through two-way communication between an on-board device mounted on a vehicle and an on-road device installed near the road on which the vehicle travels. private short-range communication). There are two types of such communication methods, that is, a passive method in which an uplink signal from a vehicle-mounted device to a vehicle-mounted device is transmitted by modulating and returning a carrier wave followed by a downlink signal transmitte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G07B15/00G08G1/09H04B1/38H04B7/26H04W4/04H04W76/02H04W88/02H04W88/08H04W92/10
Inventor 吉田一郎都筑清士田中幸臣
Owner DENSO CORP
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