Road/vehicle communication method and device
First Claim
1. A road/vehicle communication method for communication between a plurality of road devices, which are provided with a plurality of road antenna devices at respective gates, and a vehicle communication device, which is mounted to a vehicle and transmits and receives information to and from the plurality of road devices by radio waves, comprising the steps of:
- (a) when the vehicle passes through a first gate, the vehicle communication device receiving gate information which includes at least one of a gate number and antenna number and which relates to the first gate and which is transmitted from a road antenna device of the first gate, and the vehicle communication device transmitting the received gate information at a second gate;
(b) the second gate receiving gate information from a plurality of vehicle communication devices, and computing a communication probability for each antenna device of the first gate when a number of received gate information corresponding to the first gate has reached a predetermined number; and
(c) comparing, for each road antenna device, the communication probability with a predetermined reference value, and detecting as a malfunctioning road antenna device, a road antenna device for which a difference between the communication probability and the predetermined reference value exceeds a predetermined value.
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Accused Products
Abstract
A road/vehicle communication method for communication between a plurality of road devices, which are provided with a plurality of road antenna devices at respective gates, and a vehicle communication device, which is mounted to a vehicle and transmits and receives information to and from the plurality of road devices by radio waves, includes the steps of: when the vehicle passes through a first gate, the vehicle communication device receiving gate information which relates to the first gate and which is transmitted from a road antenna device of the first gate, and the vehicle communication device transmitting the received gate information at a second gate; the second gate receiving gate information from a plurality of vehicle communication devices, and computing a communication probability for each antenna device of the first gate when a number of received gate information corresponding to the first gate has reached a predetermined number; and comparing, for each road antenna device, the communication probability with a predetermined reference value, and detecting, as a malfunctioning road antenna device, a road antenna device for which a difference between the communication probability and the predetermined reference value exceeds a predetermined value. Accordingly, at the second gate, a malfunctioning road antenna device can be detected among the road antenna devices of the first gate, and measures can be taken with respect to the malfunctioning road antenna device.
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Citations
17 Claims
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1. A road/vehicle communication method for communication between a plurality of road devices, which are provided with a plurality of road antenna devices at respective gates, and a vehicle communication device, which is mounted to a vehicle and transmits and receives information to and from the plurality of road devices by radio waves, comprising the steps of:
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(a) when the vehicle passes through a first gate, the vehicle communication device receiving gate information which includes at least one of a gate number and antenna number and which relates to the first gate and which is transmitted from a road antenna device of the first gate, and the vehicle communication device transmitting the received gate information at a second gate; (b) the second gate receiving gate information from a plurality of vehicle communication devices, and computing a communication probability for each antenna device of the first gate when a number of received gate information corresponding to the first gate has reached a predetermined number; and (c) comparing, for each road antenna device, the communication probability with a predetermined reference value, and detecting as a malfunctioning road antenna device, a road antenna device for which a difference between the communication probability and the predetermined reference value exceeds a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A road/vehicle communication device for communication between a plurality of road devices, which are provided with a plurality of road antenna devices at respective gates, and a vehicle communication device, which is mounted to a vehicle and transmits and receives information to and from the plurality of road devices by radio waves, wherein
the vehicle communication device includes: -
storing means for storing gate information which includes at least one of a gate number and an antenna number and which is received when the vehicle passes through a first gate and which is transmitted from a road antenna device of the first gate and which relates to the first gate; and transmitting means for transmitting stored gate information at a second gate, and the road device includes; roadside receiving means for receiving, at the second gate, gate information from a plurality of vehicle communication devices; communication probability computing means for computing a communication probability for each road antenna device of the first gate when a number of received gate information corresponding to the first gate has reached a predetermined number comparing means for comparing, for each road antenna device, the communication probability with a predetermined reference value; and detecting means for detecting, as a malfunctioning road antenna device, a road antenna device for which a difference between the communication probability and the predetermined reference value exceeds a predetermined value. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification