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.
32 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