Time-slot-based system and method of inter-vehicle communication
First Claim
1. A vehicle-to-vehicle (V2V) communication system comprising:
- a V2V transmitter configured to operate in a transmitting vehicle;
wherein the V2V transmitter is configured to accept as input a subject vehicle position and a subject vehicle heading;
wherein the V2V transmitter broadcasts V2V messages comprising;
(i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;
wherein the V2V broadcast messages are broadcast repeatedly in a basic time interval of predetermined duration;
wherein the basic time interval comprises time slots of a predetermined duration;
a plurality of basic message classes;
wherein the basic time interval is further subdivided into class regions wherein each class region corresponds with one basic message class;
wherein each V2V broadcast message is in one of the basic message classes; and
wherein at least one class region is substantially restricted to messages transmitted from emergency vehicles.
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0 Petitions
Accused Products
Abstract
Device, system and method, in a vehicle communication system, to transmit wirelessly a message comprising the position, heading and speed of a vehicle or other moving object, wherein the transmission is repeated at regular intervals in a temporarily fixed time slot within a predetermined basic time interval. In a key embodiment the message duration is equal to or less than a predetermined time slot duration. Embodiments use generally the same time slot in a contiguous sequence of basic time intervals. Algorithms are described to resolve wireless interference within a time slot. Embodiments divide the basic time interval in multiple durations, “class regions,” for different message classes. Embodiments use different wireless bandwidth allocation algorithms for the class regions.
390 Citations
4 Claims
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1. A vehicle-to-vehicle (V2V) communication system comprising:
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a V2V transmitter configured to operate in a transmitting vehicle; wherein the V2V transmitter is configured to accept as input a subject vehicle position and a subject vehicle heading; wherein the V2V transmitter broadcasts V2V messages comprising;
(i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;wherein the V2V broadcast messages are broadcast repeatedly in a basic time interval of predetermined duration; wherein the basic time interval comprises time slots of a predetermined duration; a plurality of basic message classes; wherein the basic time interval is further subdivided into class regions wherein each class region corresponds with one basic message class; wherein each V2V broadcast message is in one of the basic message classes; and wherein at least one class region is substantially restricted to messages transmitted from emergency vehicles.
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2. A vehicle-to-vehicle (V2V) communication system comprising:
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a V2V transmitter configured to operate in a transmitting vehicle; wherein the V2V transmitter is configured to accept as input a subject vehicle position and a subject vehicle heading; wherein the V2V transmitter broadcasts V2V messages comprising;
(i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;wherein the V2V broadcast messages are broadcast repeatedly in a basic time interval of predetermined duration; wherein the basic time interval comprises time slots of a predetermined duration; a V2V message collision detector wherein the detector is configured to detect when two or more V2V messages within receive range are broadcast at the same time, a “
message collision;
”a message collision notification message, wherein the message collision notification message is broadcast in response to the detection of the message collision; and wherein the message collision notification message identifies within the message at least one source of the message collision by the time when the message collision occurred.
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3. A vehicle-to-vehicle (V2V) communication system comprising:
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a V2V transmitter configured to operate in a transmitting vehicle; wherein the V2V transmitter is configured to accept as input a subject vehicle position and a subject vehicle heading; wherein the V2V transmitter broadcasts V2V messages comprising;
(i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;wherein the V2V broadcast messages are broadcast repeatedly in a basic time interval of predetermined duration; wherein the basic time interval comprises time slots of a predetermined duration; a V2V message collision detector wherein the detector is configured to detect when two or more V2V messages within receive range are broadcast at the same time, a “
message collision;
”a message collision notification message, wherein the message collision notification message is broadcast in response to the detection of the message collision; and a second V2V message collision detector, wherein a second V2V transmitter, associated with the second V2V message collision detector, does not transmit a message collision notification message if a V2V receiver, associated with the second V2V transmitter, first receives a substantially similar collision notification message prior to the time that the second V2V transmitter would have broadcast the message collision notification message.
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4. A vehicle-to-vehicle (V2V) communication system comprising:
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a V2V transmitter configured to operate in a transmitting vehicle; wherein the V2V transmitter is configured to accept as input a subject vehicle position and a subject vehicle heading; wherein the V2V transmitter broadcasts V2V messages comprising;
(i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;wherein the V2V broadcast messages are broadcast repeatedly in a basic time interval of predetermined duration; wherein the basic time interval comprises time slots of a predetermined duration; a plurality of transmit frames, wherein the V2V transmitter messages comprise one or more frames, and wherein a frame is a continuous transmission; an inter-frame time gap between frames from one or more V2V transmitters within communication range of each other wherein the inter-frame time gap is free of transmission; and wherein the inter-frame time gaps are generally shorter in duration than the maximum communication range over which the V2V system is designed to operate divided by the speed of light.
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Specification