# US 2013/0281140 A1 · Vehicle-to-vehicle anti-collision system and method using power levels

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- Number: US 2013/0281140 A1
- Document ID: US20130281140A1
- Status: Published application
- Kind: A1
- Application number: 13/557,805
- Filed: 2012-07-25
- Published: 2013-10-24
- Earliest claimed: 2012-04-24
- Assignees: Zetta Research and Development, LLC - ForC Series
- Inventors: Kim T. Rubin; Jonathan N. Betts-Lacroix
- Web page: https://patentgrep.com/patent/US20130281140A1

## CPC

- G01C 21/3822: {Road feature data, e.g. slope data}
- G08G 1/096791: {where the origin of the information is another vehicle}
- G01C 21/26: specially adapted for navigation in a road network
- G01C 21/3658: {Lane guidance}
- G08G 1/09: Arrangements for giving variable traffic instructions ({railroad crossing signals B61L; reflectors E01F, G08B}; indicating arrangements for variable information by selection or combination of individual elements G09F9/00)
- G08G 1/0969: having a display in the form of a map
- G08G 1/142: {external to the vehicles}
- G08G 1/16: Anti-collision systems (road vehicle drive control systems for predicting or avoiding probable or impending collision otherwise than by control of a particular sub-unit B60W30/08)
- G08G 1/161: {Decentralised systems, e.g. inter-vehicle communication}
- G08G 1/163: {involving continuous checking}
- G08G 1/166: {for active traffic, e.g. moving vehicles, pedestrians, bikes}
- G08G 1/167: {Driving aids for lane monitoring, lane changing, e.g. blind spot detection}
- G08G 9/02: Anti-collision systems
- H04J 3/1694: {Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers (Passive Optical Networks H04Q11/0062)}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04W 4/027: {using movement velocity, acceleration information}
- H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W 4/46: for vehicle-to-vehicle communication [V2V]
- H04W 4/48: for in-vehicle communication
- H04W 56/0035: {detecting errors in frequency or phase}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/30: Resource management for broadcast services
- H04W 74/0816: with collision avoidance
- B60R 25/33: of global position, e.g. by providing GPS coordinates
- B60R 2325/205: Mobile phones
- B60W 10/06: including control of combustion engines
- B60W 10/18: including control of braking systems
- B60W 10/20: including control of steering systems
- B60W 50/14: Means for informing the driver, warning the driver or prompting a driver intervention
- B60W 2556/50: of positioning data, e.g. GPS [Global Positioning System] data
- G01S 5/0027: {of actual mobile position, i.e. position determined on mobile}
- G08G 1/20: {Monitoring the location of vehicles belonging to a group, e.g. fleet of vehicles, countable or determined number of vehicles}
- H04W 64/006: {with additional information processing, e.g. for direction or speed determination}
- H04W 76/14: Direct-mode setup
- H04W 76/40: for selective distribution or broadcast
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)
- G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93})
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES

## Abstract

Device, system and method, in a vehicle communication system, of managing transmitted power levels among a group of transmitters so that the effective range of the group is approximately the same for members of the group. Various embodiments include transmitting a message comprising a currently used transmit power and a recommended power level. Embodiments include algorithms for varying transmit power levels subject to various criteria. Such criteria include the number of vehicles in the range, the size of the range, available wireless bandwidth. Unique features of some embodiments include the use of broadcast messages, and messages free of IP addresses and MAC addresses.

## Claims

### Claim 1

The vehicle-to-vehicle (V2V) communication system comprising:
a set of V2V wireless transmitters located within communication range of each other wherein a majority of V2V transmitters in the set transmit messages at substantially similar power levers;
wherein the V2V transmitters in the set each comprises a plurality of available transmit power levels;

### Claim 2 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 wherein:
the V2V transmitter changes its power level responsive to a number of received V2V messages in a predetermined time period.

### Claim 3 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 wherein:
a V2V transmitter in the set transmits a message comprising a power level;
the V2V transmitter changes its transmit power level responsive to power level information in one or more received V2V messages.

### Claim 4 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 wherein:
a V2V transmitter in the set transmits a message comprising a recommended power level;
the V2V transmitter averages the recommended power levels broadcast by the set of V2V transmitters within communication range.

### Claim 5 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 wherein:
a V2V transmitter in the set is configured to transmit a message comprising both an as-transmitted power level and a recommended power level;
the V2V transmitter is configured to set the recommended power level responsive to a number of messages in a priority class received within a time period.

### Claim 6 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 further comprising:
a V2V transmitter in the set is configured to transmit a message comprising both an as-transmitted power level and a recommended power level;
the V2V transmitter is configured to set the recommended power level responsive to available bandwidth within a permitted spectrum.

### Claim 7 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 further comprising:
a V2V transmitter in the set is configured to transmit a message comprising both an as-transmitted power level and a recommended power level;
the V2V transmitter is configured to change the recommended power level at a rate of change no greater than a predetermined rate of change.

### Claim 8 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 further comprising:
a V2V transmitter in the set is configured to transmit a “power level message” comprising both an as-transmitted power level and a recommended power level;
the V2V transmitter is configured to transmit the power level message only when either (i) the difference between the recommended power level and the as-transmitted power level exceeds a predetermined threshold; or (ii) a predetermined time period has elapsed since the prior transmission of a power level message.

### Claim 9 (depends on 1)

The vehicle-to-vehicle (V2V) communication system of claim 1 further comprising:
a V2V transmitter in the set is configured to adapt its transmit power level responsive to a risk value of a message.

### Claim 10

A method of vehicle-to-vehicle (V2V) communication comprising:
transmitting a first power message comprising a first power level value;
receiving a plurality of other vehicle power messages comprising other vehicle power level values;
transmitting a second power message comprising a second power level value wherein the second power level value is different than the first power level value.

### Claim 11 (depends on 10)

The method of vehicle-to-vehicle (V2V) communication of claim 10 further comprising:
averaging the other vehicle power level values, the “received power average;”
changing the second power level value responsive to the difference between the received power average and the first power level value.

### Claim 12 (depends on 10)

The method of vehicle-to-vehicle (V2V) communication of claim 10 further comprising:
counting the number of unique vehicles from which V2V messages have been received within a predetermined time duration;
changing the second power level value responsive to the number of unique vehicles.

### Claim 13

A vehicle-to-vehicle (V2V) communication device comprising:
a V2V transmitter transmitting power level messages, adapted to transmit at a plurality of power levels;
a V2V receiver receiving power level messages from other V2V transmitters within range;
a V2V communication time base;
a logic module to receive, store, and analyze received power level messages, and to generate power level messages to transmit.