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Simulator integration: Vissim (Environment simulator) + NS2 (Telecom simulator) = RuBeNS Rural & UrBan e-Travelling Network Simulator PowerPoint PPT Presentation


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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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Simulator integration: Vissim (Environment simulator) + NS2 (Telecom simulator) = RuBeNS Rural & UrBan e-Travelling Network Simulator

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Simulator integration:Vissim (Environment simulator) + NS2 (Telecom simulator) =RuBeNSRural & UrBan e-Travelling Network Simulator

Péter Laborczi

Sándor Kardos

Attila Török

Lóránt Vajda


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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)


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Example

  • Floating Car Data:

    • Vehicle act as moving sensors

      • GPS

      • Weather sensors

      • Radar

  • Distributed

  • Centralized


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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


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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


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GPS module

  • Purpose:

    • Realistic modelling of GPS errors

  • Why?

    • Crucial to prevent bump-ins

  • Error sources and modelled error [m]:


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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


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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


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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


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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


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Four Scenarios

  • Traditionalsee the DEMO

    • No equipped vehicles

  • Centralized FCD

  • Distributed FCDsee the DEMO

    • Ad-hoc route guidance

  • Cooperative route guidancesee the DEMO


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Average Travel Time


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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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