1. A Vehicle-to-Vehicle Communication Protocol
for Cooperative Collision Warning
學生：黃建輔
指導老師：許毅然

2. Outline
Introduction
Vehicular Collision Warning Communication Protocol
Performance Evaluation
References

3. 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.

4. Introduction What is V2V? 2/3 What 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

5. 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
V2V System
Conventional System

6. 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

7. Vehicular Collision Warning Communication Protocol
Rate Decreasing Algorithm for EWMs

8. Vehicular Collision Warning Communication Protocol
State Transitions of AVs
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

9. Performance Evaluation

10. References
V2V: What are vehicle-to-vehicle communications and how do they work?
vehicle-to-vehicle-communications-and-how-does-it-work
A Vehicle-to-Vehicle Communication Protocol for Cooperative Collision Warnin
(IEEE 2004)