for cooperative collision warning 學生:黃建輔 指導老師:許毅然
TRANSCRIPT
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A Vehicle-to-Vehicle Communication Protocol
for Cooperative Collision Warning
學生:黃建輔指導老師:許毅然
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Introduction Vehicular Collision Warning Communication
Protocol Performance Evaluation References
Outline
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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.
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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
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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
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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
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Vehicular Collision Warning Communication Protocol
Rate Decreasing Algorithm for EWMs
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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
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Performance Evaluation
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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)