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
CN1351313AInactive Publication Date: 2002-05-29DENSO CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DENSO CORP
Publication Date
2002-05-29
Estimated Expiration
Not applicable · inactive patent

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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).
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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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