Abstract:
Secure
communication, an important aspect of any networking environment, is an
especially signicant challenge in ad hoc networks. The MANET paradism seeks to enable communication across
networks whose topology and membership can change frequently. Its distinctive
feature is that network nodes need to collaborate with their peers in supporting the network
functionality. In
such an environment, malicious or selfish nodes can disrupt or even deny the
communications of potentially any node within the ad hoc networking domain.
This is so, exactly because every node in the network is not only entitled, but
is in fact required, to assist in the network establishment, the network
maintenance, and the network operation.
Ad-Hoc Networks consist of peer-to-peer
communicating nodes that are highly mobile. As such, an ad-hoc network lacks infrastructure and topology of
the network changes dynamically. The task of routing data from a source to a
destination in such a network is challenging. Several routing protocols have
been proposed for wireless ad-hoc networks. Most of these protocols, however,
presuppose the presence of bi-directional links between the nodes in the
network. In reality the ad-hoc network may consist of heterogeneous nodes with
different power capabilities and hence, different transmission ranges. When
this is the case, a given node might be able to receive the transmission of
another given node but might not be able to successfully transmit to the
latter. Thus, unidirectional links are formed. Most of the current routing
protocols are unsuitable for deployment when such unidirectional links are
present. We consider a routing protocol called the zone routing protocol (ZRP) that has been proposed for
wireless ad-hoc networks with bi-directional links. The zone routing protocol
employs a hybrid proactive (table driven) and reactive (on- demand) methodology to provide scalable
routing in the ad-hoc network. However, in the presence of
unidirectional links some routes remain undiscovered if ZRP is used. We propose extensions to ZRP to support its deployment when unidirectional links are
present. In particular, we propose a query enhancement mechanism that
recursively builds partial routes to a destination.
No comments:
Post a Comment