Vehicle-to-vehicle safety transceiver using time slots
First Claim
1. A device of manufacture for use in a vehicle-to-vehicle (V2V) communication system comprising:
- a V2V transceiver adapted to operate in a transmitting vehicle;
wherein the V2V transceiver is adapted to accept as input a subject vehicle position and a subject vehicle heading;
wherein the V2V transceiver is adapted to broadcast a V2V safety message comprising (i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;
a basic time interval of a fixed, predetermined duration, wherein the basic time interval repeats continuously;
wherein the basic time interval comprises an integer n time slots of predetermined duration, sequentially enumerated from 1 to n, and contiguous;
wherein the V2V transceiver is adapted to receive messages from another V2V transceiver wherein the V2V transceiver and the other V2V transceiver use the same basic time interval, comprising the same n time slots, and wherein all basic time intervals are time synchronized;
wherein the V2V transceiver selects a selected time slot from the n time slots;
wherein the V2V transceiver continues to transmit in the selected time slot, until either (i) a message collision in the selected time slot occurs, or (ii) a re-evaluation time interval expires, thereupon selecting a new time slot.
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Accused Products
Abstract
A transceiver in a vehicle-to-vehicle (V2V) communication and safety system that regularly broadcasts safety messages, comprising location, heading and speed, of a subject vehicle, that are free of MAC and IP addresses. The V2V system uses the location of the subject vehicle for vehicle identification, in place of a pre-assigned vehicle ID. Some embodiments broadcast safety message in self-assigned time slots in a synchronized TDMA broadcast architecture, with unusually short inter-message gaps and unusually short messages. The TDMA frame is partitioned into three prioritized time interval classes with differing priorities and dynamically changing sizes based on demand of higher-priority messages. Time slot selection uses weighted algorithms. Selected time slots are held until either a message collision or a timeout occurs. A transceiver equipped vehicle may proxy a different subject vehicle. Embodiments include optimized traffic flow and signal timing.
47 Citations
14 Claims
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1. A device of manufacture for use in a vehicle-to-vehicle (V2V) communication system comprising:
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a V2V transceiver adapted to operate in a transmitting vehicle; wherein the V2V transceiver is adapted to accept as input a subject vehicle position and a subject vehicle heading; wherein the V2V transceiver is adapted to broadcast a V2V safety message comprising (i) the subject vehicle position;
(ii) the subject vehicle heading;
(iii) a subject vehicle speed;a basic time interval of a fixed, predetermined duration, wherein the basic time interval repeats continuously; wherein the basic time interval comprises an integer n time slots of predetermined duration, sequentially enumerated from 1 to n, and contiguous; wherein the V2V transceiver is adapted to receive messages from another V2V transceiver wherein the V2V transceiver and the other V2V transceiver use the same basic time interval, comprising the same n time slots, and wherein all basic time intervals are time synchronized; wherein the V2V transceiver selects a selected time slot from the n time slots; wherein the V2V transceiver continues to transmit in the selected time slot, until either (i) a message collision in the selected time slot occurs, or (ii) a re-evaluation time interval expires, thereupon selecting a new time slot. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification