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CS541 Advanced Networking 1 Vehicular Ad Hoc Networks (VANETs) Neil Tang 2/4/2009
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CS541 Advanced Networking 2 Outline Network Architecture Characteristics Applications Major Concerns 802.11p Network Layer Challenges Mobility Model
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CS541 Advanced Networking 3 Network Architecture
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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.
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CS541 Advanced Networking 5 Applications Safety-related information dissemination Internet access for passengers
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CS541 Advanced Networking 6 Major Concerns Location-related broadcasting/multicasting support QoS support: reliability and delay Scalability Cooperation Security
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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
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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)
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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
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