Vehicle communication system
First Claim
1. A vehicle communication system comprising:
- a host-vehicle information generating unit which generates running information of a host vehicle;
a communication processing unit which transmits the running information of the host vehicle generated by the host-vehicle information generating unit in wireless communications and receives running information of other vehicles in wireless communications;
a virtual region defining unit which defines virtual regions around the travelling direction of the host vehicle on the basis of the generated running information of the host vehicle;
a traffic line determination unit which determines whether or not there are located the other vehicles the number of which is larger than a threshold value in front and rear regions in the running direction of the host vehicle among the defined virtual regions, on the basis of the received running information of the other vehicles and the generated running information of the host vehicle; and
a transmission controlling unit which maintains a first transmission power when it is determined by the traffic line determination unit that the number of the other vehicles is smaller than the threshold value, and which controls to reduce the transmission power in wireless communications to a second transmission power lower than the first transmission power when it is determined by the traffic line determination unit that the number of the other vehicles is larger than the threshold value.
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Accused Products
Abstract
The present invention provides a vehicle communication system by which even when the number of other vehicles around a traffic line is increased, it is possible to prevent occurrence of a situation that there are located vehicles the number of which is larger than the capacity of a communicable network, and it is possible to secure communications with the other vehicles. Even when it is determined that a host vehicle enters in a traffic line and a plurality of other vehicles the number of which is larger than a threshold value are located in front and rear virtual regions of the host vehicle, a transmission power is reduced to the extent that communications between the host vehicle and one of the other vehicles that is located furthest in the virtual regions can be secured.
20 Citations
10 Claims
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1. A vehicle communication system comprising:
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a host-vehicle information generating unit which generates running information of a host vehicle; a communication processing unit which transmits the running information of the host vehicle generated by the host-vehicle information generating unit in wireless communications and receives running information of other vehicles in wireless communications; a virtual region defining unit which defines virtual regions around the travelling direction of the host vehicle on the basis of the generated running information of the host vehicle; a traffic line determination unit which determines whether or not there are located the other vehicles the number of which is larger than a threshold value in front and rear regions in the running direction of the host vehicle among the defined virtual regions, on the basis of the received running information of the other vehicles and the generated running information of the host vehicle; and a transmission controlling unit which maintains a first transmission power when it is determined by the traffic line determination unit that the number of the other vehicles is smaller than the threshold value, and which controls to reduce the transmission power in wireless communications to a second transmission power lower than the first transmission power when it is determined by the traffic line determination unit that the number of the other vehicles is larger than the threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicle communication system comprising:
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a host-vehicle information generating unit which generates running information of a host vehicle; a communication processing unit which transmits the running information of the host vehicle generated by the host-vehicle information generating unit in wireless communications and receives running information of other vehicles in wireless communications; a database in which the running information of the other vehicles received by the communication processing unit is accumulated; a virtual region defining unit which defines virtual regions around the travelling direction of the host vehicle on the basis of the generated running information of the host vehicle; a traffic line determination unit which determines whether or not there are located the other vehicles the number of which is larger than a threshold value in front and rear regions in the running direction of the host vehicle among the defined virtual regions, on the basis of the running information of the other vehicles accumulated in the database and the generated running information of the host vehicle; and a transmission controlling unit which controls, when it is determined by the traffic line determination unit that the number of the other vehicles is larger than the threshold value, to narrow a transmission range in wireless communications as compared to a case that the number of the other vehicles is smaller than the threshold value.
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Specification