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Introduction to Vehicular Ad Hoc Networks

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Introduction to Vehicular Ad Hoc Networks Chia-Jui Tsai 2007/3/25 * Outline Introduction Choice Technology and Service Research Challenges Selected Research Results ... – PowerPoint PPT presentation

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Title: Introduction to Vehicular Ad Hoc Networks


1
Introduction to Vehicular Ad Hoc Networks
  • Chia-Jui Tsai
  • 2007/3/25

2
Outline
  • Introduction
  • Choice Technology and Service
  • Research Challenges
  • Selected Research Results
  • GST Telematics Platform
  • Scalability for Message Dissemination
  • Conclusion

3
Introduction
  • Vehicular ad hoc networks (VANETs) ,a subclass of
  • mobile Ad Hoc networks (MANETs). is a
    promising approach for future intelligent
    transportation system (ITS).
  • The direct communication between vehicles using
    an Ad Hoc network, referred to as
  • inter-vehicle communication (IVC)
  • Car-to-car communication(C2CC)
  • vehicle ad hoc networks (VANETs)

4
Introduction(Cont.)
  • ???????(ITS, Intelligent Transportation
    System)?????????,??,????????,????,?,??????,????(re
    al-time)?????????????,??????,??????????????
  • ITS?????
  • ????
  • ????????????????,????????????????,???????????????,
    ????24?????????????????
  • ????
  • ??????????????????????,????????????
  • ????
  • ????????????????????????????

5
Motivation for VANET
  • The main goal of VANET is increased driving
    comfort and safety.
  • Use communication for new services
  • Collision warning
  • Up-to-date traffic information
  • Active navigation services
  • Weather information

6
Choice Technology
  • Wireless Access Technologies
  • IEEE 802.11 WLAN
  • GPRS/UMTS
  • Dedicated Short Range Communication (DSRC)
  • IEEE 802.11p (C2C Comm.)
  • IEEE 1609

7
DSRC Concept
  • ITS??????,??????????????????
  • ????(Road Side Unit, RSU)?????(On-Board Unit,
    OBU)???
  • ????(OBU)?????(OBU)???

8
DSRC Standards
  • ????????????

9
IEEE 802.11p
  • ??WAVEWireless Access in the Vehicular
    Environment
  • ????IEEE 802.11??????????????????????????????
  • ?????IEEE 802.11?????,??????????(Intelligent
    Transportation Systems,ITS)?????
  • ????????????????????5.9GHz(5.85-5.925GHz)?????ITS?
    ??????????????
  • ???????802.11???????,????2009?4??????802.11p????

10
IEEE 1609
  • IEEE 1609?????IEEE 802.11p????????????
  • IEEE1609?????????????????????(????,????,??,?????)?
    ???????????????,?? 5.9 GHz?????,????????????????IE
    EE 802.11?????????????802.11p(?IEEE
    802.11a????)?????????,????IPv6??????????

11
IEEE 1609(Cont.)
  • IEEE1609??????,????????????????,?????????
  • (1)IEEE 1609.1 -- WAVE Resource Manager
    ,?????????????????????????
  • (2)IEEE 1609.2 -- WAVE Security Services for
    Applications and Management Messages
    ,?????WAVE??????????????????????
  • (3)IEEE 1609.3 -- WAVE Networking
    Services,??????????????????
  • (4)IEEE 1609.4 -- WAVE Multi-Channel
    Operations,???IEEE 802.11p MAC?WAVE????
  • http//www.standards.its.dot.gov/fact_sheet.asp?f
    80

12
Choice Service
  • Service Types
  • Car-to-Car Services
  • Car-to-Infrastructure Services
  • Portal-based Services

13
Possible Services for C2C Networks
  • Car-to-Car Services
  • Exchange of traffic information
  • Exchange of weather or road conditions
  • Car-to-Infrastructure Services
  • Active road side infrastructure
  • Road Side Units (RSU) as information points
  • Portal-based Services
  • Use of a Telematics platform
  • Services like Pay-as-you-drive insurance

14
Telematics platform
  • Telematics????Telecommunication?Informatics???
  • ??????Telematics??????????????????????????????????
    ??????????????????,????????????????????,?????????
    ?????????????,???????????????

15
Research Challenges for VANET
  • Protocols and Wireless Access
  • Scalability Problem
  • Robust and reliable communication even at high
    speeds
  • Efficient data dissemination schemes for large
    networks
  • (gtgt100 nodes)
  • Integration and Definition of Security and
    Privacy
  • Realization of efficient trust environments (PKI)
  • Reliability of nodes, routes, and messages
  • Sufficient anonymity for mobile nodes

16
  • Overview of Selected Research Results

17
The GST Telematics Service Platform
  • GST Global System for Telematics
  • Vision Standard for Vehicular Telematics
  • Platforms
  • Open platform with reconfigurable services

18
GST Project Details Status
  • Integrated EU project (FP6)
  • Consortium with 49 companies
  • OEMs BMW, DaimlerCrysler, Fiat, Ford,
    Renault,Volvo
  • Project Management ERTICO
  • Vision/Goal Open environment ? generate a
  • de facto standard(???? )
  • http//www.gstforum.org/

19
Scalability for Message Dissemination
  • Many parallel information services
  • ? Network congestion
  • New approach Use context information to
    prioritize messages (benefit maximization)

20
Scalability for Message Dissemination(Cont.)
  • Mmessage , Vvehicle , Iinformation
  • aiapplication-dependent factors
  • biapplication-dependent subfunctions
  • all weighted parameters have to be summed up and
    divided by the sum of all ai , leading to a
    benefit value between 0 and 1.

21
Conclusion
  • ???????(Intelligent Transport Systems,ITS)
    ??????????????,??????????????
  • ?????ITS??????key componet?Vehicular Ad-hoc
    Networks????????,???,???????????
  • ?????????

22
Reference
  • 1 Eichler, Stephan  Schroth, Christoph 
    Eberspächer, Jörg Car- to-Car Communication.
    In Proceedings of the VDE-Kongress - Innovations
    for Europe  VDE Verlag, 2006.- VDE-Kongress -
    Innovations for Europe.- Aachen, p. 6.- URL
  • http//www.alexandria.unisg.ch/Publikationen/
    30950
  • 2 "Vehicular Ad Hoc Networks (VANETs)
    Challenges and Perspectives", 6th
    International Conference on ITS
    Telecommunications, 2006.
  • 3 Dedicated Short Range Communication
    (DSRC)???????????????????????????????

23
Reference(Cont.)
  • 4 http//zh.wikipedia.org/wiki/IEEE_802.11p
  • 5 TIMO KOSCH, CHRISTIAN J. ADLER, STEPHAN
    EICHLER, CHRISTOPH SCHROTH,
  • AND MARKUS STRASSBERGER, THE
    SCALABILITY PROBLEM OF VEHICULAR
  • AD HOC NETWORKS AND HOW TO SOLVE
    IT, IEEE Wireless Communications October 2006
  • 6 http//grouper.ieee.org/groups/802/11/Reports/
    tgp_update.htm
  • 7 http//standards.ieee.org/announcements/PR_rad
    iocomstd.html

24
  • END
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