1. 1 Measure and model vehicular- to-infrastructure communication

2. Abstract Vehicular ad hoc network (VANET) Problem defined A self-organization based broadcast scheme

3. Vehicular ad hoc network (VANET) Ad hoc network –Mobile ad hoc network –Vehicular ad hoc network Communication Types –Vehicle to vehicle –Vehicle to Infrastructure

4. Not to Scale Grass Divider VEHICLE TO VEHICLE

5. up to 825 ft range Mobile Radio Traffic Signal Intersection Radio Traffic Signal - Green Traffic Signal- Red Radio Communication Vehicle TO Infrastructure

6. Mobile Radio Traffic Signal Intersection Radio Traffic Signal - Green Traffic Signal- Red Radio Communication A traffic jam in intersection

7. Problem defined Periodical broadcast some information on vehicle Packet collision –Especial in traffic jam A self-organization based broadcast scheme

8. Goal of this proposal Measure V2I communication –Packet lose rate –Packet delivery rate –Delay time –Refer to difference velocity, density, etc. Reduce packet collision Not only apply on V2I but also suit on V2V

9. A self-organization based broadcast scheme Basic idea –Adjust broadcast interval by itself Packets received can be referred Information delivery from RSU can be referred

10. Adjustment Function on a vehicle Packets Received (From RSU and OBU) Filter Equation based Or Layered based Broadcasting Adjustment Function Filter parameters: Position Velocity Direction Etc. Function based and layered based may be designed after intersection testing.

11. Steps of this proposal Try To gather traffic information form websites. Create broadcast packets base on the gather information. Design a self-organization broadcast scheme Compare with original and proposed scheme performance using simulator. They may include packet lose rate, success rate, delay time, etc.

12. Real-Time Traffic Information

13. Real-Time Traffic Information (Cont.)

14. The End Thank you