Electronic toll collection system adapted to plural types of protocols employed by various on-vehicle units
First Claim
1. A stationary-station communication system for performing accounting processing through communication with an on-vehicle unit mounted on a vehicle passing a predetermined communication area, the system comprising:
- a controller including a protocol controller configured to produce a protocol selection signal and a communication controller configured to control the communication based on the produced communication protocol selection signal; and
an antenna unit including a modem unit configured to selectively have a plurality of types of modulation/demodulation techniques corresponding to a plurality of types of protocols for the communication and control means configured to selectively allow the modem unit to be switched into a particular modulation/demodulation technique specified by the protocol selection signal.
1 Assignment
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Accused Products
Abstract
An electronic toll collection (ETC) system comprises an on-vehicle unit mounted on a vehicle and a stationary-station communication system. This communication system operates to perform communication for accounting processing toward the on-vehicle unit mounted on the vehicle that passes a predetermined communication area. The stationary-station communication system comprises a controller and an antenna unit. The controller includes a protocol controller configured to produce a protocol selection signal and a communication controller configured to control the communication based on the produced communication protocol selection signal. The antenna unit includes a modem unit configured to selectively have a plurality of types of modulation/demodulation techniques corresponding to a plurality of types of protocols for the communication and control means configured to selectively allow the modem unit to be switched into a particular modulation/demodulation technique specified by the protocol selection signal.
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Citations
18 Claims
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1. A stationary-station communication system for performing accounting processing through communication with an on-vehicle unit mounted on a vehicle passing a predetermined communication area, the system comprising:
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a controller including a protocol controller configured to produce a protocol selection signal and a communication controller configured to control the communication based on the produced communication protocol selection signal; and
an antenna unit including a modem unit configured to selectively have a plurality of types of modulation/demodulation techniques corresponding to a plurality of types of protocols for the communication and control means configured to selectively allow the modem unit to be switched into a particular modulation/demodulation technique specified by the protocol selection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic toll collection system comprising:
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an on-vehicle unit mounted on a vehicle; and
a stationary-station communication system performing communication for accounting processing toward the on-vehicle unit mounted on the vehicle that passes a predetermined communication area, wherein the stationary-station communication system comprises;
a controller including a protocol controller configured to produce a protocol selection signal and a communication controller configured to control the communication based on the produced communication protocol selection signal; and
an antenna unit including a modem unit configured to selectively have a plurality of types of modulation/demodulation techniques corresponding to a plurality of types of protocols for the communication and control means configured to selectively allow the modem unit to be switched into a particular modulation/demodulation technique specified by the protocol selection signal. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A communication method for electrically collecting a toll, in which accounting processing is performed through communication between an on-vehicle unit mounted on a vehicle and a stationary-station communication system when the vehicle passes a predetermined communication area, the stationary-station communication system being provided with a modem unit capable of communicating on a plurality of modulation/demodulation techniques corresponding to a plurality of protocols, the communication method comprising the steps of:
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producing a protocol selection signal that allows the plurality of types of protocols to be selected by turns every period of time during which at least one time of communication processing is performed with the on-vehicle unit, and providing the protocol selection signal to the modem unit so that the modem unit communicates on a particular modulation/demodulation technique corresponding to a particular protocol specified by the protocol selection signal. - View Dependent Claims (15, 16, 17, 18)
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Specification