Mobile communication apparatus
First Claim
1. A mobile communications system providing, selectively, one-way and two-way communications between a preceding road vehicle and a succeeding road vehicle, comprising:
- in the succeeding road vehicle;
a receiver receiving a carrier signal from the preceding road vehicle,a detector detecting whether a signal level of the carrier signal received from the preceding road vehicle is above a predetermined signal level and producing a corresponding detection output, anda communications controller, in response to the detection output of the detector, transmitting information on a modulated carrier signal to the preceding road vehicle; and
in the preceding road vehicle;
a detector detecting a carrier signal transmitted from the succeeding road vehicle and received by the preceding road vehicle and determining if communication is possible for the received and detected carrier signal and, if so, producing a corresponding carrier signal detection output, anda communications controller, in the absence of a carrier signal detection output from the detector indicating a detector determination that communication on the carrier is not possible, transmitting data to the succeeding terrestrial vehicle by one-way communication and, in response to the carrier signal detection output of the detector indicating a detector determination that communication on the carrier is possible, performing two-way communications between the succeeding and preceding terrestrial vehicles.
1 Assignment
0 Petitions
Accused Products
Abstract
Mobile communication apparatus, of small size and low cost, may be installed in vehicles to afford enhanced mobile-to-mobile communications between preceding and succeeding vehicles, even over a great distance therebetween. In the preceding vehicle, a detector detects a carrier transmitted from the succeeding vehicle and a transmission controller uses the carrier, when detected, for transmitting data to the succeeding vehicle. Further, the detector in the preceding vehicle detects, from the carrier transmitted from the succeeding vehicle, whether the distance to the succeeding vehicle is in a range permitting two-way communications therebetween. The transmission controller in the preceding vehicle transmits first information to the succeeding vehicle when the detector does not detect the possibility of two-way communication, and transmits second information to the succeeding vehicle when the detector detects the possibility of two-way communications with the succeeding vehicle.
16 Citations
16 Claims
-
1. A mobile communications system providing, selectively, one-way and two-way communications between a preceding road vehicle and a succeeding road vehicle, comprising:
-
in the succeeding road vehicle; a receiver receiving a carrier signal from the preceding road vehicle, a detector detecting whether a signal level of the carrier signal received from the preceding road vehicle is above a predetermined signal level and producing a corresponding detection output, and a communications controller, in response to the detection output of the detector, transmitting information on a modulated carrier signal to the preceding road vehicle; and in the preceding road vehicle; a detector detecting a carrier signal transmitted from the succeeding road vehicle and received by the preceding road vehicle and determining if communication is possible for the received and detected carrier signal and, if so, producing a corresponding carrier signal detection output, and a communications controller, in the absence of a carrier signal detection output from the detector indicating a detector determination that communication on the carrier is not possible, transmitting data to the succeeding terrestrial vehicle by one-way communication and, in response to the carrier signal detection output of the detector indicating a detector determination that communication on the carrier is possible, performing two-way communications between the succeeding and preceding terrestrial vehicles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A mobile communications system providing, selectively, one-way and two-way communications between a preceding road vehicle and a succeeding road vehicle and comprising, in at least one of the succeeding and preceding road vehicles:
-
a detector detecting whether a condition for two-way communications between the preceding and succeeding road vehicles is satisfied, and producing a corresponding detection output; and a communications controller, in the absence of a carrier signal detection output from the detector, transmitting data to the other of the succeeding and preceding road vehicles by a one-way communication and, in response to the carrier signal detection output of the detector, transmitting data in two-way communications to and from the other of the succeeding and preceding road vehicles. - View Dependent Claims (13, 14, 15, 16)
-
Specification