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)