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

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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…!!!