CHAPTER 1
INTRODUCTION
1.1 VEHICULAR AD HOC NETWORKS
Vehicular Ad-hoc Networks (VANETs) represent a rapidly emerging,
particularly challenging class of Mobile Ad Hoc Networks (MANETs). VANET
as a sub class of Mobile Ad hoc Networks (MANET) provides a wireless
communication among vehicles and also vehicle to road side equipment. Nodes
in VANETs are self organized and can self-manage information in a distributed
fashion without a centralized authority or a server dictating the communication
and are thus characterized by very high speed and limited degrees of freedom in
nodes movement patterns. Such particular features often make standard
networking protocols inefficient or unusable in VANETs.They can be used to
establish communication between vehicles and therefore, develop pervasive
VANET tends to operate without infrastructure and each vehicle will be
a node in the network and can send, receive and relay messages with other
nodes. In this way, vehicles can exchange real time information and drivers can
be informed about the road traffic conditions and any other valuable
information. VANETs have attractive unique features distinguishing them from
other types of mobile ad hoc networks like unlimited transmission power,
higher computational capability and predictable mobility.VANET has recently
received considerable attention both from academia and industry. In the past
few years, due to the expansion of wireless communication technologies,
substantial research efforts have been devoted to Vehicle Ad hoc Networks
works (VANETs) for inter-vehicle communications.
1.1.1 GENERAL VANETs ARCHITECTURE
Inter-vehicle communication: Also known as vehicle to-vehicle (V2V)
communication or pure ad hoc. In this case, vehicles communicate with
each other with no infrastructure support and any valuable information
collected from sensors on vehicle can be sent to notify...