A Vehicle-to-Vehicle Communication Protocol

for Cooperative Collision Warning

學生：黃建輔指導老師：許毅然

Introduction Vehicular Collision Warning Communication

Protocol Performance Evaluation References

Outline

Introduction What is V2V? 1/3 Vehicle-to-vehicle (V2V) communications comprises a

wireless network uses dedicated short-range communications (DSRC) automobiles send messages to each other with information

about what they're doing This data would include speed, location, direction of travel,

braking, and loss of stability.

IntroductionWhat V2V could track and report Vehicle speed Vehicle position and heading (direction of

travel) On or off the throttle (accelerating, driving,

slowing) Brakes on, anti-lock braking Lane changes Stability control,

traction control engaged

What is V2V? 2/3

Introduction What is V2V? 3/3 the orange vehicle receives messages from the other

vehicles in a 360ᵒ area bound by a 300 meter radius enabling safety applications that monitor the entire surroundings for crash imminent threats

The conventional system includes forward-looking long range radar and mono camera, as well as short range radar on each rear corner for blind zone detection

Conventional System V2V System

Vehicular Collision Warning Communication Protocol

it becomes an abnormal vehicle(AV) An AV actively generates Emergency

Warning Messages (EWMs) If a packet successful goes through,

transmission rate is increased; while the rate is decreased if a packet gets lost

N3 reacts to the sudden stop of vehicle A with emergency brake

Vehicular Collision Warning Communication Protocol

Rate Decreasing Algorithm for EWMs

Vehicular Collision Warning Communication Protocol

Each AV may be in one of three states, initial AV, nonflagger AV and flagger AV

An initial AV can become a non-flagger AV to eliminate redundant

A vehicle can only become a flagger AV some time after the emergency

State Transitions of AVs

Performance Evaluation

References V2V: What are vehicle-to-vehicle

communications and how do they work?◦ http://www.extremetech.com/extreme/176093-v2v-what-

are-vehicle-to-vehicle-communications-and-how-does-it-work

A Vehicle-to-Vehicle Communication Protocol for Cooperative Collision Warnin◦ (IEEE 2004)