CS541 Advanced Networking 1 Vehicular Ad Hoc Networks (VANETs) Neil Tang 2/4/2009
CS541 Advanced Networking 2 Outline Network Architecture Characteristics Applications Major Concerns p 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 based MAC Layer p 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