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Péter Laborczi Sándor Kardos Attila Török Lóránt Vajda

Simulator integration: Vissim (Environment simulator) + NS2 (Telecom simulator) = RuBeNS Rural & UrBan e-Travelling Network Simulator. Péter Laborczi Sándor Kardos Attila Török Lóránt Vajda. Main goal.

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Péter Laborczi Sándor Kardos Attila Török Lóránt Vajda

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  1. Simulator integration:Vissim (Environment simulator) + NS2 (Telecom simulator) =RuBeNSRural & UrBan e-Travelling Network Simulator Péter Laborczi Sándor Kardos Attila Török Lóránt Vajda

  2. Main goal • Integrate environment simulator with telecommunications simulator to evaluate protocols for specific scenarios • Pile-up avoidance scenario (accident prevention) • Road traffic information scenario (traffic jam avoidance) • Ad hoc tempomat scenario (driving comfort)

  3. Example • Floating Car Data: • Vehicle act as moving sensors • GPS • Weather sensors • Radar • Distributed • Centralized

  4. Emergency signalling implementation • Purpose: • Test the effects of wireless emergency warning signalling • Why? • If legal restrictions forbid intervention (breaking), only signalling is possible • Implemented signalling • Vehicle detecting accidents broadcasts warning message • Messages are forwarded up to 1000m by cars • Equipped car drivers are notified when the message is received • Cars with no warning device notice the problem 1.5 seconds after the supposed reception

  5. Ad hoc traffic information sending/handling • Purpose: • To avoid traffic jams without centralinfrastructure • Why? • Reduce travel times withouta single point of failure and maintainance costs • Implemented signalling • Equipped cars send travel time information • They receive information for all neighboringstreets • Based on this information they reroute whennecessary

  6. GPS module • Purpose: • Realistic modelling of GPS errors • Why? • Crucial to prevent bump-ins • Error sources and modelled error [m]:

  7. Graph representation of road network • Purpose: • To have a mathematically tractablemodel of the map • Why? • To be able to find shortest path (Dijkstra)between locations and be able to selectrelevant messages • Implementation of an online ”converter”from Vissim road network format to our(Boost library based) graph format

  8. Realworld map converter • Purpose: • Convert XML format mapfile to VISSIM format • Why? • To be able to simulatetraffic in real cities • Part of Budapest (BUTE surroundings) can nowbe examined within RuBeNS BUTE surroundings Kalvin sqare Danube

  9. XML based traffic matrix handling • Purpose: • To have an easily usable trafficdescription • Why? • To be able to examine differenttraffic conditions • Implementation is based on xmlwrapp library

  10. Vehicular communication systems - Software Modules Linux Windows NS-2 VISSIM Road traffic simulator Application / Group comm. interface CommunicationProtocol VISSIM interface PHY interface TCP/IP Socket TCP/IP Socket

  11. Four Scenarios • Traditional see the DEMO • No equipped vehicles • Centralized FCD • Distributed FCD see the DEMO • Ad-hoc route guidance • Cooperative route guidance see the DEMO

  12. Average Travel Time

  13. Lookout • Simulation environment RUBeNS implemented to simulate: • Road network & vehicle traffic • Infocommunication network & data traffic • Different FCD approaches and communications simulated • More applications are under development: • Ad-hoc tempomat (ACC) • pile-up avoidance • Intelligent flooding protocol • Study of the communication network: • Load • Latency • Reliability

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