1. Miguel Sepulcre, Javier Gozalvez, Onur Altintas, and Haris Kremo
Adaptive beaconing for congestion and awareness control in vehicular networks
Miguel Sepulcre, Javier Gozalvez, Onur Altintas, and Haris Kremo
Vehicular Networking Conference (VNC) 2014

2. Vehicular networks
Cooperative vehicular networks require the exchange of messages
The dynamic adaptation of the transmission parameters is needed - Congestion control - Awareness control

3. Congestion control Control the channel load
The adaptation of the transmission parameters based on channel load metrics
LIMERIC and PULSAR

4. Awareness control
Adequately support cooperative vehicular applications
Adapt the transmission parameters to ensure each vehicle’s capacity to detect and possibly communicate
MINT

5. To date
Congestion and awareness control protocols have been normally designed and evaluated separately
This paper proposes INTERN (integration of congestion and awareness control), a new control protocol that integrates congestion and awareness control processes

6. Benchmark protocols
Congestion control - LIMERIC (linear message rate integrated control) - PULSAR (periodically updated load sensitive adaptive rate control)
Awareness control - MINT (minimum packet transmission frequency)

7. LIMERIC
LIMERIC adapts the packet transmission frequency based on a target channel load level and the channel load
rg is the overall target packet frequency
r(t-1) represents the measured overall packet frequency by the vehicle in the previous time window

8. PULSAR
PULSAR adapts the packet transmission frequency of each vehicle using an additive increase multiplicative decrease (AIMD) technique
If the CBR is above CBRmax, the packet transmission frequency is decreased by a multiplicative factor
CBRmax is the maximum CBR within two hops

9. MINT
Each vehicle proactively adapts its transmission parameters to the minimum needed to satisfy its individual application’s requirements
MINT sets the packet transmission frequency equal to the application’s packet reception frequency plus a fixed margin ΔTf=1Hz

10. INTERN
INTERN integrates MINT with the linear control process proposed in LIMERIC
Additionally INTERN exploits the benefits of the 2-hops piggybacking proposed in PULSAR
Finally, INTERN calculates the transmission power following MINT

11. Simulation parameters

12. Evaluation scenarios
Scenario 1 – highway crossing

13. Performance evaluation

14. Evaluation scenarios
Scenario 2 – highway

15. Performance evaluation

16. Performance evaluation