In-vehicle radio apparatus
First Claim
1. An in-vehicle radio apparatus comprising:
- a transmission unit for transmitting a radio signal by using a spread spectrum method;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a spread code corresponding to an approach direction of the vehicle to the intersection as a spread code used for transmission by the transmission unit based on determination by the first approach determination unit.
1 Assignment
0 Petitions
Accused Products
Abstract
In an in-vehicle radio apparatus to radio-transmit information from a vehicle about to enter an intersection, the interference between a radio signal transmitted from the vehicle and a radio signal transmitted from another vehicle is suppressed. Further, an approach direction of the vehicle to the intersection can be accurately transmitted. In the radio apparatus to transmit a radio signal by using a spread spectrum method, it is determined that the vehicle has approached a first distance from the intersection, and based on the determination, a spread code corresponding to an approach direction of the vehicle to the intersection is allocated as a spread code used for transmission.
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Citations
42 Claims
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1. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal by using a spread spectrum method;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a spread code corresponding to an approach direction of the vehicle to the intersection as a spread code used for transmission by the transmission unit based on determination by the first approach determination unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal by using a spread spectrum method; and
an allocation unit for allocating a spread code corresponding to a traveling direction of a vehicle to an intersection as a spread code used for transmission by the transmission unit. - View Dependent Claims (26)
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27. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit, wherein the allocation unit specifies the communication channel corresponding to the approach direction of the vehicle to the intersection based on a traveling direction of the vehicle and correspondence data between the approach direction to a particular intersection and the communication channel. - View Dependent Claims (28, 29)
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30. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit, wherein the allocation unit specifies the communication channel corresponding to the approach direction of the vehicle to the intersection based on a traveling direction of the vehicle and correspondence data between an approach direction to an intersection and the communication channel by geographical division.
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31. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection;
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit; and
a different-timing transmission control unit for, based on detection of existence of, between the intersection and the vehicle, a preceding vehicle that performs transmission of a radio signal in the communication channel corresponding to the approach direction of the vehicle to the intersection, performing the transmission by the transmission unit with the communication channel allocated by the allocation unit at a timing different from a timing of transmission in the preceding vehicle.
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32. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection;
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit; and
a first transmission power control unit for controlling transmission power of the transmission unit so that the transmission power is reduced as the distance between the vehicle and the intersection becomes shorter.
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33. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection;
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit; and
a preceding vehicle detection unit for detecting existence of, between the intersection and the vehicle, a preceding vehicle that performs transmission of a radio signal in the communication channel corresponding to the approach direction of the vehicle to the intersection, and based on the detection, prohibiting the transmission by the transmission unit in the communication channel allocated by the allocation unit. - View Dependent Claims (34)
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35. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection;
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit;
a second approach determination unit for determining that the vehicle has entered a second distance shorter than the first distance from the intersection; and
a first transmission power control unit for reducing transmission power of the transmission unit based on determination by the second approach determination unit.
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36. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit, wherein the signal transmitted by the transmission unit includes position data of the vehicle specified by a navigation apparatus by using map matching.
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37. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection without a traffic light; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit.
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38. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection around which a building exists; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit.
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39. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit, wherein regarding a five-forked or more-forked intersection, the communication channel includes five or more communication channels corresponding to approach directions to the intersection, respectively.
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40. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection; and
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit, wherein regarding closely continuous intersections, the communication channels that correspond to adjacent intersections do not overlap with each other.
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41. An in-vehicle radio apparatus comprising:
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a transmission unit for transmitting a radio signal;
a first approach determination unit for determining that a vehicle has entered a first distance from an intersection;
an allocation unit for allocating a communication channel corresponding to an approach direction of the vehicle to the intersection as a communication channel used for transmission by the transmission unit based on determination by the first approach determination unit; and
a reception unit for trying reception of a radio signal in a communication channel corresponding to an approach direction different from the approach direction of the vehicle to the intersection, based on determination by the first approach determination unit by using reception unit for transmitting a radio signal. - View Dependent Claims (42)
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Specification