Device for synchronizing a time base for V2V communictation
First Claim
1. A device of manufacture for sending and receiving vehicle-to-vehicle (V2V) safety messages, in a V2V communication system, comprising a transceiver in a subject vehicle wherein the transceiver is configured to wirelessly broadcast and receive messages comprising a protocol comprising:
- a synchronized time base used by all V2V transceivers in the V2V communication system;
a basic time interval, of a predetermined duration, repeating continuously and contiguously, responsive to the synchronized time base;
n contiguous time slots, of a predetermined duration, enumerated from 1 to n, wherein the basic time interval comprises the n time slots;
wherein at least some messages are transmitted in a time-division, multiple-access (TDMA) protocol comprising the basic time interval and the time slots;
an algorithm for self-selecting a selected time slot by the V2V transceiver;
an internal time base synchronization function;
wherein the time base synchronization function is responsive to (i) a global positioning satellite transmission;
(ii) an internal clock;
and (iii) a plurality of valid transmissions received from a plurality of similar transceivers in other vehicles within wireless communication range; and
wherein the time base synchronization function adjusts the synchronized time base such that it is synchronized with the V2V transceivers in the V2V communication system.
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Accused Products
Abstract
A device and vehicle for use in, and system for, a vehicle-to-vehicle (V2V) communication and safety system that uses TDMA communication architecture with a self-synchronized TDMA time base. The time base starts with a GPS and internal clock, then fine-tunes by averaging the time bases of all vehicles within radio range. In the described algorithms, all vehicles within a communication range rapidly converge on a common time base to high precision. The regularly broadcast safety messages themselves are used for time base synchronizing, eliminating the need for separate time stamps or transmissions. A range group of vehicles, first converges itself, then converges the group on a UTC time via GPS. Embodiments include use of vehicle distances in time computations. Applications anti-collision systems, optimized traffic flow and signal timing.
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Citations
23 Claims
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1. A device of manufacture for sending and receiving vehicle-to-vehicle (V2V) safety messages, in a V2V communication system, comprising a transceiver in a subject vehicle wherein the transceiver is configured to wirelessly broadcast and receive messages comprising a protocol comprising:
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a synchronized time base used by all V2V transceivers in the V2V communication system; a basic time interval, of a predetermined duration, repeating continuously and contiguously, responsive to the synchronized time base; n contiguous time slots, of a predetermined duration, enumerated from 1 to n, wherein the basic time interval comprises the n time slots; wherein at least some messages are transmitted in a time-division, multiple-access (TDMA) protocol comprising the basic time interval and the time slots; an algorithm for self-selecting a selected time slot by the V2V transceiver; an internal time base synchronization function; wherein the time base synchronization function is responsive to (i) a global positioning satellite transmission;
(ii) an internal clock;and (iii) a plurality of valid transmissions received from a plurality of similar transceivers in other vehicles within wireless communication range; and wherein the time base synchronization function adjusts the synchronized time base such that it is synchronized with the V2V transceivers in the V2V communication system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device of manufacture for sending and receiving vehicle-to-vehicle (V2V) safety messages, in a V2V communication system, comprising a transceiver in a subject vehicle wherein the transceiver is configured to wirelessly broadcast and receive messages comprising a protocol comprising:
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a synchronized time base used by all V2V transceivers in the V2V communication system; a basic time interval, of a predetermined duration, repeating continuously and contiguously, responsive to the synchronized time base; n contiguous time slots, of a predetermined duration, enumerated from 1 to n, wherein the basic time interval comprises the n time slots; wherein at least some messages are transmitted in a time-division, multiple-access (TDMA) protocol comprising the basic time interval and the time slots; an algorithm for self-selecting a selected time slot by the V2V transceiver; an internal time base synchronization function; wherein the time base synchronization function is responsive to (i) a global positioning satellite transmission;
(ii) an internal clock; and
(iii) a plurality of valid transmissions received from a plurality of similar transceivers in other vehicles within wireless communication range; andwherein the time base synchronization function adjusts the synchronized time base such that it is synchronized with the V2V transceivers in the V2V communication system; the internal time base synchronization function comprises an internal reference point in time; the transceiver further comprises an internal time base adjustment function such that the internal reference point in time converges to a single converged reference point, within a predetermined range, for all transceivers with wireless communication range. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification