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VEHICULAR AD-HOC NETWORK
(VANET)
VEDANT A. GODHAMGAONKAR
AGENDAIntroduction
Schematic Representation of a VANET
Vehicular Communication
VANET Architecture
Applications of VANET
Characteristics
Current Research
Conclusion
References
WHAT IS VANET?A VANET, is a technology that uses moving cars as
nodes in a network to create a mobile network.
It is used to provide communications among nearby vehicles and between vehicles and nearest fixed equipment, usually described as roadside equipment.
“VANET make transportation systems more intelligent”
Motivation for VANETIncrease safety Hundreds of thousands of people are killed
world- wide due to road accidents yearly. Many more are injured. Traffic optimization
Congestion/traffic jams cost time and fuel.
Both these problems can be solved by giving timely information to the drivers!
Differences from MANET MANETs VANETsUnicast and Multicast
protocols in MANETs
Majority of nodes in MANETs
dependent on batteries for
their energy.
Unavailability of infrastructure
VANETs use broadcasting to
provide important control and
route establishment.
VANET nodes are vehicles, so
there are less power and
storage constraints.
Fixed infrastructure for VANETs
Schematic Representation of a VANET
Vehicular CommunicationVANET communicates through Wireless
Access for Vehicular Environments (WAVE).
The WAVE uses different types of Wireless Commutation devices such as (Wi-Fi / Wi-Max).
The sensors or wireless devices can form a VANET network which resides on top of the vehicle.
Cont…
Protocol used in VANETThere are no standardized protocols, but a lot of
research is going on in this area. Likewise these are some of the protocols…
AODV (Ad hoc On-Demand Distance Vector)
OLSR (Optimized Link State Routing Protocol)
DYMO (Dynamic MANET On-Demand)
DSRC (Dedicated Short Range Communication)
CALM (Cont Air interface for Long & Medium distance)
CVIS (Cooperative Vehicle-Infrastructure System)
OFDM (Orthogonal Frequency Division Multiplexing)
VANET ARCHITECTURE
Staircase approach: An application can select among multiple service access points to lower layers.
Single-hop layer: communication to direct radio neighbors.
Multi-hop layer :forwarding packets to non neighbored nodes using neighbors as forwarders.
Information connector: offering an interface to events such as “Position Update Events” or “Neighbor Position Change Events”.
IMPLEMENTING PROTOCOLSIn cases of emergencies, the protocol is used to open
an instant communication channel with the vehicle in
the most dangerous situation. Unicast information packed in a broadcast
protocol Belongs to: Reliable Protocols for a Specific
Purpose
12
Application: Congestion DetectionRelay congestion information
Hop-by-hop message forwardingOther vehicles can choose alternate routes
Cont...
Co-operative Collision Warning Lane Change Warning Intersection Collision Warning
Approaching Emergency vehicle Rollover Warning Work Zone Warning
Coupling/Decoupling Inter-Vehicle Communications Electronic Toll Collection
VANET Characteristics The main characteristics of VANETs
High mobility of nodes No prior information about location of nodes Predictable topology (to some extent) The communication link in a VANET is short
lived No problem with power High possibility to be fragmented
Current ResearchUSA:
1)Vehicle Safety Communications Consortium(VSCC) 2)DSRC/WAVE Technology
3)Vehicle Infrastructure Integration (VII)
Europe: 1)Car to Car Communication
Consortium 2)Network on Wheels (“NOW”)(Germany)
Japan: Internet ITS Consortium
ConclusionsVANETs have many practical applications, but
the most important ones are in terms of active safety.
There are no standardized protocols, but a lot of research is going on in this area.
VANETs are likely to become the most important
realization of mobile ad hoc networks.
REFERENCEShttp://pcquest.ciol.com/content/technology/
2009/109020101.asphttp://en.wikipedia.org/wiki/Vehicular_ad-
hoc_network#Applications
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4458046
http://aivanetblog.blogspot.com/Ad-hoc wireless network by MURTHY MANOJ
THANK YOU…!!!