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Abstract :- Vehicular Ad hoc Network (VANET) is a new
communication paradigm that enables the communication
process between these vehicles which acts as nodes in the
network. Various methods of data dissemination in VANET
are used to inform the vehicles about the dynamic road
traffic conditions for achieving safe and efficient
transportation. Ad-hoc On-demand Distance Vector
(AODV) is a reactive routing protocol designed for the adhoc
networks. AODV is an unicast routing protocol which
establishes a route only when a node wants to send data
packets. AODV involves route discovery and route
maintenance process. Due to large delay in the route
discovery process and due to route failure which may
require a new route discovery process, the data transmission
rate decreases and network overhead increases. In this paper
we have discussed AODV protocol and its comparison with
OLSR and DSR routing protocol.
Key words: VANET, AODV, OLSR, DSR
Since their arrival in the 1970s, the use of wireless
communication technology has increased. An ad hoc
wireless network consists of mobile nodes which
communicate with each other without any infrastructure.
Vehicular Ad hoc Network (VANET) is a new technology
integrating ad hoc network, WLAN and cellular technology
to achieve intelligent inter-vehicle communications and
improve road traffic safety and efficiency. IEEE formed the
IEEE 802.11p task group for Wireless Access in Vehicular
VANET is a new distinctive form of Mobile Ad
Hoc Network (MANET). Without having any infrastructure
and legacy client and server communication, VANET is a
highly autonomous network where each vehicle in it acts as
a wireless router or a node to communicate with nearby
vehicles and fixed roadside equipment. In VANET the
movement of vehicles is affected by the factors like the
structure of the road, traffic congestion and traffic rules.
VANET involves topology which changes very rapidly and
also the network gets disconnected frequently.
Many routing protocols have been proposed for ad hoc
networks. A protocol can perform worse or better than other
protocols depending upon scenario of ad hoc networks.After reviewing different approaches we can conclude that
AODV is better than OLSR and DSR in terms of packet
delivery ratio and end-end delay.
Though some improvement needed in AODV
routing protocol because the route discovery process on
route failure causes a great delay.