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VEHICULAR WIRELESS NETWORKS

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VEHICULAR WIRELESS NETWORKS Powered By Docstoc
					VEHICULAR
WIRELESS
NETWORKS
AN OVERVIEW

SEMINAR-TALK MOBILE SYSTEMS
BY
PASCAL MUTHER
AGENDA
Introduction
Routing
Reliability & Latency
Security & Privacy
Simulation
Positioning
Socio-Economic Challenges
Future Research
Summary
Discussion
INTRODUCTION I
Vehicle Ad-hoc network (VANET)
  • Decentralized
  • No communication coordinator
  • No fix communication Infrastructure
  • Moving nodes (cars), somehow predictable
  • Using WiFi (IEEE 802.11)
Cellular network alternative
Increase safety, efficiency & ecology of traffic
INTRODUCTION II
Car-to-car communication
  • Information sharing
        • Lane change
        • Road conditions
        • Remote diagnostic
  • Intelligent Navigation systems
        • Traffic jams
        • Accidents
Vehicle-to-Roadside communication
  • Speed advisory
  • Traffic Information
  • Speeding tickets
INTRODUCTION III
Intra-car communication
  • Wireless automotive sensor network (WANS)
       • Replacing cables
       • Opening new fields (e.g. Wheel pressure sensors)
       • Cost and weight reduction
  • Multimedia devices (not discussed)
ROUTING I
Standardsoftware without subnets
  • No routers and IP routing
  • ARP-Requests in whole net
  • mobility
  • Global DHCP-Server
  • Message overhead                          without subnets

Standardsoftware with subnets
  • ARP limited to cluster
  • No global DHCP-Server
  • 3 running Protocols (IP, ARP, Flooding)


                                              with subnets
ROUTING II
Customized software
  • Efficiency
  • With or without subnets
  • Non standard
Conclusion
  •   No best solution
  •   Customized software improves efficiency
  •   For complex network structure customized software desirable
  •   IP is not must, deliverable by hardware address
RELIABILITY &
LATENCY I
Important for wireless automotive
sensor networks (WANS)
Limited time /area of relevance
No TCP/IP needed
Why ZigBee?
  •   Closest suitable match
  •   Cost
  •   Power consumption
  •   Data Rate
                                    Comparison of existing standards
RELIABILITY &
LATENCY II
Interferences with Bluetooth?
  • same Frequency Range, ISM-Band (2.4 GHz)
  • Optional Bluetooth devices
Conclusion
  • Without Bluetooth
       • nearly error-free
  • With Bluetooth
       • mostly acceptable performance
       • for some parts meshed
         networks (cable & wireless)
         recommended
SECURITY & PRIVACY
Reliable and safe Information needed
  • Networks of trust
  • encryption
De- & Encryption cost
Either message authentication or privacy
SIMULATION I
Environment
 • Traffic simulation
       • e.g. CARISMA
       • Hard to simulate real traffic behaviour
 • Network simulation
       • e.g. NS2
       • Many different approaches and software
 • Application simulation
SIMULATION II
    Approach I                      Approach III
      • Synchronisation at tx         • Only estimation for
      • Equal position in traffic       tx+1transmitted
        & network simulation          • Wrong positions
      • Hopping points              Approach IV
    Approach II                       • Head start for traffic
      • Position at tx and              simulation
        estimation for tx+1           • Accurate positions
      • Gap between                   • Best choice
        estimation and real
        location
SIMULATION III
Coupling Approaches
POSITIONING I
Positioning with VANET
  •   GPS is too expensiv
  •   Not always possible (e.g. Buildings)
  •   Fix WiFi-Infrastructure needed
  •   Easy appraoch with WiFi-Infrastructure
POSITIONING II
Vehicle Tracking (VETRAC)
  • WiFi-Hotspots needed (fix)
  • Tracking nodes (vehicles) by their IP
  • Applications
       • Vehicle Tracking
       • Theft prevention
SOCIO-ECONOMIC
CHALLENGES
Market penetration
High network effects
Cost
Competition in defining standards
FUTURE RESEARCH I
Internet Access
  • How to connect
        • Roadside infrastructure
        • C2C-Approach with multi-hop
        • Cellular systems
  • Possibilities
        • Information
        • City guide
        • entertainment
FUTURE RESEARCH II
Mobile Agents
  • Are everywhere (PDA, Cell, Notebook,…)
  • How to connect
  • possiblities
SUMMARY
Of economical & technical interest
Evolving research area
Dynamic movement as difficult challenge
Different car-manufacturers are also involved in research
Market penetration as a big problem
Many problems to solve…
… some are already solved
QUESTIONS
???
BREAK
DISCUSSION I
Is VANET defining a new standard for
the automobile industry?
DISCUSSION II
Are actual Network Protocols enough
powerfull to support this new
Networkstructure
DISCUSSION III
Isn’t it too expensive to build up so
large public infrastructure paid by
taxes?
DISCUSSION IV
Is it creating a new two-class society?
Those who can use VANET and those
who can‘t?
DISUSSION V
Can the VANET approach also be
used in other areas as airports/planes
or in hospitals?
REFERENCES I
S. Eichler et al.: Simulation of car-to car messaging:
Analyzing the impact on road traffic, 13th Annual Meeting of
the IEEE International Symposium on Modeling, Analysis and
Simulation of Computer Telecommunication Systems
(MASCOTS), September 2005.
M. Ahmed, C.U. Saraydar, T. ElBatt, J. Yin, T. Talty, m. Ames:
Intra-vehicular Wireless Networks, Globecom-Workshops,
2007, pp.1-9, 26-30 Nov. 2007.
R. de Francisco, L. Huang, G. Dolmans, H. de Groot:
Coexistence of ZigBee Wireless Sensor Networks and
Bluetooth inside a vehicle, Personal, Indoor and Mobile
Radio Communications, 2009. IEEE 20th International
Symposion, pp. 2700-2704, 13-16 Sept. 2009.
REFERENCES II
S. Yoon, Ch. Qiao, R.S. Sudhaakar, J. Li, T. Talty: QoMOR: A
QoS-aware MAC protocol using Optimal Retransmission for
Wireless Intra-Vehicular Sensor Networks, Mobile Networking
for Vehicular Environments, 2007. pp. 121-126, 11 May 2007.
M. Khanapurkar, P. Bajaj, D. Gharode: A Design Approach for
Intelligent Vehicle Black Box Systems with Intra-Vehicular
communication using LIN/Flex-ray Protocols, Industrial
Technology, 2008. ICIT 2008. IEEE International Conference,
pp. 1-6, 21-24 April 2008.
A. Thangavelu, K. Bhuvaneswari, K. Kumar, K. Senthilkumar,
S.N. Sivanandam: Location Identification and Vehicle
Tracking using VANET (VETRAC), Signal Processing,
Communication and Networking, 2007. ICSCN '07, pp.112-
116, 22-24 Feb. 2007.
REFERENCES III
H. Fussler, S. Schnaufer, M. Transier, W. Effelsberg: Vehicular
ad-hoc networks: from vision to reality and back, Wireless on
Demand Network Systems and Services, 2007. WONS '07,
pp.80-83, 24-26 Jan. 2007.
O. Urra, S. Ilarri, T. Delot, E. Mena: Mobile Agents in Vehicular
Networks: Taking a First Ride, 8th International Conference
on Practical Applications of Agents and Multi-Agent Systems
(PAAMS), pp. 118-124, 2010.
C. Maihofer, M. Bechler: Design alternatives for IP in vehicles,
Vehicular Technology Conference, 2003. VTC 2003-Spring.
The 57th IEEE Semiannual, vol.3, no., pp. 1783-1787 vol.3, 22-
25 April 2003
REFERENCES IV
M.E. Zarki, S. Mehrota, G. Tsudik, N. Venkatasubramanian:
Security Issues in a Future Vehicular Network, Symposiumm
a Quarterly Journal in modern Literatures, pp. 270-274, 2002.

				
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