Simulator integration: Vissim (Environment simulator) NS2 (Telecom simulator) = RuBeNS Rural

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Simulator integrationVissim (Environment
simulator) NS2 (Telecom simulator) RuBeNS
Rural 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 centralinfrastructu
  re
• 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

Error source GPS DGPS
Satellite Clocks 1.5 0
Orbit errors 2.5 0
Ionosphere 5 0.4
Troposhere 0.5 0.2
Receiver noise 0.3 0.3
Multipath 0.6 0.6
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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 converterfrom
  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
Windows
Linux
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

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

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Average Travel Time
Traditional scenario Centralized FCD Distributed FCD Cooperative Route Guidance
Average travel time 386.5 sec 164.2 sec 156.8 sec 114.2 sec
Route travel times
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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