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Vehicular Ad Hoc Networks (VANETs) Neil Tang 2/4/2009

Vehicular Ad Hoc Networks (VANETs) Neil Tang 2/4/2009. Outline. Network Architecture Characteristics Applications Major Concerns 802.11p Network Layer Challenges Mobility Model. Network Architecture. Characteristics. Multihop wireless network

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Vehicular Ad Hoc Networks (VANETs) Neil Tang 2/4/2009

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  1. Vehicular Ad Hoc Networks (VANETs)Neil Tang2/4/2009 CS541 Advanced Networking

  2. Outline • Network Architecture • Characteristics • Applications • Major Concerns • 802.11p • Network Layer Challenges • Mobility Model CS541 Advanced Networking

  3. Network Architecture CS541 Advanced Networking

  4. Characteristics • Multihop wireless network • Mobile nodes with movements restricted by roadways • Rich resources: power, memory, processing capabilities. • Every node is aware of its location, speed and moving direction. CS541 Advanced Networking

  5. Applications • Safety-related information dissemination • Internet access for passengers CS541 Advanced Networking

  6. Major Concerns • Location-related broadcasting/multicasting support • QoS support: reliability and delay • Scalability • Cooperation • Security CS541 Advanced Networking

  7. 802.11-based MAC Layer- 802.11p • 5.9GHz licensed spectrum band • High bandwidth • Ad-hoc mode (hidden terminal problem) • Short transmission range • Poor mobility support CS541 Advanced Networking

  8. Network Layer Challenges • Traditional ad hoc routing VS. store-and-forward (stateless) routing • Location-based unicast routing: location is known. • Geocast routing: Location-related broadcast and multicast routing • QoS support: reliability and delay • Mobility prediction: Movements are restricted and mobility parameters are known. • Routing in hybrid wireless networks (fixed roadside access points + mobile node) CS541 Advanced Networking

  9. Mobility Model • The well-known random waypoint model is not suitable for VANETs. • A mobility model needs to take into account the special movement properties: Manhatten model and city section model CS541 Advanced Networking

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