1. David Starobinski Boston University 11/03/2016
Connected Vehicles
David Starobinski
Boston University
11/03/2016
Activities

2. Connected vehicles
11/03/2016
Applications

3. References: http://www.safercar.gov/v2v/index.html
Connected vehicles
11/03/2016
References:

4. Connected Vehicle Technology
Connected vehicles
11/03/2016
Connected Vehicle Technology
Dedicated Short Range Communications (Wi-Fi adapted for moving vehicles)
300 m range
FCC 5.9 GHz spectrum allocation
Basic Safety Message (BSM): 10 times/sec
Vehicles listen to other vehicles’ BSMs and issue warnings as needed

5. BSM Contents Connected vehicles 11/03/2016
Position, speed, heading. Varying length. On the order of a few hundreds bytes. Part II is optional and contains other attributes.

6. In-vehicle Components
Connected vehicles
11/03/2016
In-vehicle Components

7. Typical latency requirements
Connected vehicles
11/03/2016
Typical latency requirements
End-to-end! From the time a sensing signal is recorded on vehicle 1 till a warning is issued on vehicle 2.

8. Spectrum allocation Connected vehicles 11/03/2016
Two channels: 10 MHz wide: 172 (exclusively for BSMs) and 178 (control channel)
Typically requires two radios

9. Many standards! Connected vehicles 11/03/2016
Need to consider all layers not only MAC and PHY

10. Challenges Channel congestion Security Spectrum sharing
Connected vehicles
11/03/2016
Challenges
Channel congestion
May arise at high vehicle density
Requires mitigation mechanisms
Security
Communication overhead (e.g., digital signatures, digital certificates)
Computation overhead (e.g., signature verification)
Spectrum sharing
Co-channel interferences
Adjacent channel interferences
Trade-off: range vs congestion
Trade-off: security vs performance
Trade-off: spectrum utilization vs safety