Mobile Ad hoc Networks, called MANETs
In the recent years communication technology and services have advanced. Mobility has become very
important, as people want to communicate anytime from and to anywhere. In the areas where there is little or
no infrastructure is available or the existing wireless infrastructure is expensive and inconvenient to use.
Mobile Ad hoc Networks, called MANETs, are becoming useful. They are going to become integral part of
next generation mobile services.” A MANET is a collection of wireless nodes that can dynamically form a
network to exchange information without using any pre-existing fixed network infrastructure”. The term
MANET (Mobile Adhoc Network)refers to a multihop packet based wireless network composed of a set of
mobile nodes that can communicate and move at the same time , without using any kind of fixed wired
infrastructure. MANET is actually self organizing and adaptive networks that can be formed and deformed
on-the-fly without the need of any centralized administration.The special features of MANET bring this
technology great opportunity together with severe challenges.
The military tactical and other security-sensitive operations are still the main applications of ad hoc networks,
although there is a trend to adopt ad hoc networks for commercial uses due to their unique properties.
However, they face a number of problems. Generally there are two distinct approaches for enabling wireless
mobile units to communicate with each other:
Wireless mobile networks have traditionally been based on the cellular concept and relied on good
infrastructure support, in which mobile devices communicate with access points like base stations connected
to the fixed network infrastructure. Typical examples of this kind of wireless networks are GSM, UMTS,
WLL, WLAN, etc.