DSRC car-mounted equipment including sensitivity-increasing means for communication in an electronic toll collection system
First Claim
Patent Images
1. 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;
whereinthe 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.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
3 Claims
-
1. 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;
whereinthe 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.
-
-
2. 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;
whereinthe 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.
-
-
3. 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;
whereinthe 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;
whereinwhen 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.
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
-
Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
-
InventorsOouchi, Jun
-
Primary Examiner(s)PEREZ GUTIERREZ, RAFAEL
-
Application NumberUS09/635,636Time in Patent Office1,902 DaysField of Search455/254, 455/232.1, 455/233.1, 455/234.1, 455/234.2, 455/245.1, 455/426.1, 455/67.11, 455/126, 340/928, 340/901, 340/905, 340/539.1, 340/539.22, 340/539.23, 705/13US Class Current455/254CPC Class CodesG07B 15/063 using wireless information ...
