1. E-Road Project An Overview Pravin Shankar spravin@rutgers.edu

2. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

3. Outline Introduction Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

4. Introduction Vehicular networking  Reduce accidents  Streamline traffic  Provide rich multimedia application support VANETs – specific instance of MANETs FCC – 5.9GHz DSRC band Related work

5. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

6. The E-Road Vision To design an intelligent transportation system to revolutionize the way we drive by supporting  Collaborative traffic information exchange  Emergency/Safety Message Dissemination  On-demand Traffic Conditions monitoring  Dynamic Route Planning  Rich multimedia distribution

7. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

8. TrafficView – Look beyond your eyes What’s in front of that bus ? What’s behind the bend ? On rainy days On foggy days

9. TrafficView Vehicular Adhoc Networks (VANETS) Each node consists of:  Embedded Computer  GPS device  IEEE 802.11b/g WiFi Augmented with amplifier and antenna  TouchScreen UI

10. Prototype Implementation Implementation in Java and OpenGL Works on Windows and Linux, PCs and iPAQs

11. Research Issues in TrafficView Aggregation  Put as much data as possible in one packet  Perform more aggregation as distance increases Validation  Information received could be incorrect – either malicious neighbor, or malfunctioning neighbor  Perform data cleansing, and aging of records GPS Position Accuracy  GPS devices have accuracy of 20 m (3 m with D-GPRS)  Use collaborative correction information to improve accuracy without requiring infrastructure (like WAAS) or specialized devices (like gyroscope).

12. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

13. On-demand Traffic Query Protocol VITP – Vehicular Information Transfer Protocol  An information transfer protocol for vehicular computing Location-sensitive queries and replies between nodes of a VANET VITP Peers – nodes that operate as clients, intermediates, or servers Location encoding and Geographical Routing

14. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

15. Enhancements to MAC layer DSRC 5.9 GHz Licensed Spectrum IEEE 802.11 unsuitable for the network conditions posed by VANETs High Vehicle Mobility Priority of Services Cross-layer awareness

16. Outline Introduction E-Road Vision TrafficView On-demand Traffic Query Protocol Enhancements to MAC layer Hybrid Vehicular Network Architecture

17. What happens when a wifi link fails?  Use alternate communication links, eg. GPRS/3G when network partitions When to switch between the two?  Wifi – high bandwidth, low latency, free, but unreliable  GPRS/3G – low bandwidth, high latency, expensive, but reliable Design an intelligent MAC layer which switch between these two medium based on network conditions and application demands.

18. Thank you! http://discolab.rutgers.edu/traffic/