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a Mobile Ad hoc
NETwork (MANET) is one that comes together as needed, not necessarily with any
support from the existing infrastructure or any other kind of fixed stations.
We can formalize this statement by defining an ad hoc (ad-hoc or adhoc) network
as an autonomous system of mobile hosts (MHs) (also serving as routers)
connected by wireless links, the union of which forms a communication network
modeled in the form of an arbitrary communication graph. This is in contrast to
the wellknown single hop cellular network model that supports the needs of
wireless communication by installing base stations (BSs) as access points. In
these cellular networks, communications between two mobile nodes completely
rely on the wired backbone and the fixed BSs. In a MANET, no such
infrastructure exists and the network topology may dynamically change in an
unpredictable manner since nodes are free to move.
Important
characteristics of a MANET Characteristics:
Dynamic Topologies
Nodes are free to move arbitrarily with different speeds; thus,the network topology
may change randomly and at unpredictable times.
Energy-constrained
Operation Some or all of the nodes in an ad hoc network may rely on batteries
or other exhaustible means for their energy. For these nodes, the most
important system design optimization criteria may be energy conservation.
Limited Bandwidth:
Wireless links continue to have significantly lower capacity than infra structured
networks. In addition, the realized throughput of wireless communications –
after accounting for the effects of multiple access, fading, noise, and
interference conditions, etc., is often much less than a radio's maximum
transmission rate
Security Threats :
Mobile wireless networks are generally more prone to physical security threats
than fixed-cable nets. The increased possibility of eavesdropping, spoofing,
and minimization of denial-of service type attacks should be carefully
considered.
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