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US 6,959,177 B1Granted
DSRC car-mounted equipment including sensitivity-increasing means for communication in an electronic toll collection system
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorJun Oouchi
Life of this patent
Estimating the term…
Abstract
A DSRC car-mounted equipment for transmitting and receiving data to and from an on-the-road equipment, preventing communication error after the start of communication. The equipment comprises reception sensitivity-increasing means 14, 15, 40 for increasing the reception sensitivity in a communication area with the on-the-road equipment in response to the entrance into a communication start area with the on-the-road equipment, wherein the reception sensitivity-increasing means returns the reception sensitivity back to the normal reception sensitivity of before entering into the communication start area in response to the end of communication with the on-the-road equipment.
Claims3
A DSRC car-mounted equipment for transmitting and receiving data with an on-the-road equipment comprising:
- a reception sensitivity-increasing means for increasing the reception sensitivity in a communication area with an on-the-road equipment in response to the entrance into a communication start area with the on-the-road equipment;
- wherein the reception sensitivity-increasing means returns the reception sensitivity back to a normal reception sensitivity of before entering into the communication start area in response to the end of communication with the on-the-road equipment,
- said DSRC car-mounted equipment further comprising:
- a local oscillator related to a reception mixer and a transmission modulator for transmission and reception to and from the on-the-road equipment;
- and
- a transmission output-increasing means for increasing the transmission output to the on-the-road equipment in the communication area in response to the entrance into the communication start area;
- wherein
- the transmission output-increasing means returns the transmission output to the normal transmission output of before the entrance into the communication start area in response to a end of communication with the on-the-road equipment;
- the reception sensitivity-increasing means and the transmission output-increasing means are constituted by an amplifier for amplifying a signal output from the local oscillator and a control unit for controlling the amplification factor of the amplifier in response to a signal received from the on-the-road equipment;
- and
- the control unit changes the amplification factor of the amplifier into an amplification factor larger than a normal amplification factor in response to at least a second or a subsequent communication signal received from the on-the-road equipment after the entrance into the communication start area.
8 more elements
A DSRC car-mounted equipment for transmitting and receiving data with an on-the-road equipment comprising:
- a reception sensitivity-increasing means for increasing the reception sensitivity in a communication area with an on-the-road equipment in response to the entrance into a communication start area with the on-the-road equipment;
- wherein the reception sensitivity-increasing means returns the reception sensitivity back to a normal reception sensitivity of before entering into the communication start area in response to the end of communication with the on-the-road equipment,
- said DSRC car-mounted equipment further comprising transmission output-increasing means for increasing the transmission output to the on-the-road equipment in the communication area in response to the entrance into the communication start area, wherein the transmission output-increasing means returns the transmission output back to a normal transmission output of before entering into the communication start area in response to the end of communication with the on-the-road equipment,
- wherein the transmission output-increasing means includes:
- a transmission amplifier for amplifying a signal transmitted to the on-the-road equipment;
- and
- a transmission control unit for controlling the amplification factor of the transmission amplifier in response to a signal received from the on-the-road equipment;
- wherein
- the transmission control unit changes the amplification factor of the transmission amplifier to an amplification factor larger than a normal amplification factor in response to at least a second or a subsequent communication signal received from the on-the-road equipment after the entrance into the communication start area.
6 more elements
A DSRC car-mounted equipment for transmitting and receiving data with an on-the-road equipment comprising:
- a reception sensitivity-increasing means for increasing the reception sensitivity in a communication area with an on-the-road equipment in response to the entrance into a communication start area with the on-the-road equipment;
- wherein
- the reception sensitivity-increasing means returns the reception sensitivity back to a normal reception sensitivity of before entering into the communication start area in response to the end of communication with the on-the-road equipment,
- wherein said DSRC car-mounted equipment further comprises a vehicle speed control unit for producing a vehicle speed data of a vehicle,
- wherein the reception sensitivity-increasing means includes:
- a predetermined value-setting means for setting a first predetermined value corresponding to a low-speed running state of the vehicle and a second predetermined value corresponding to a high-speed running state of the vehicle;
- and
- a vehicle speed-judging means for comparing the vehicle speed data with the first and second predetermined values;
- wherein
- when the vehicle speed data is smaller than the first predetermined value, the normal reception sensitivity is corrected toward a decreasing side;
- and
- when the vehicle speed data is larger than the second predetermined value, the normal reception sensitivity is corrected toward an increasing side.
9 more elements
Dependencies are inferred from the claim text.