Enhanced Two-Way Directional Routing for MANETs

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N.J aisankar
R. Saravanan


Mobile ad hoc networks poses a problem called asymmetry in the sense imbalance in the property of the network like connectivity,
routing performance and packet loss. Asymmetry arises due to the formation of unidirectional links. The bidirectional wireless links in the
MANET tends to unidirectional because of varying transmission power in the devices, non-uniform environmental noise, and other signal
propagation phenomenon’s. First we present a study of asymmetric links on network connectivity and routing performance. Then we present a
framework called two-way routing algorithm that provides a bidirectional abstraction of the asymmetric network to routing protocols. Two-way
routing algorithm works by maintaining multi-hop reverse routes for unidirectional links and provides three new abilities: improved connectivity
by taking advantage of the unidirectional links, reverse route forwarding of control packets to enable off-the-shelf routing protocols, and
detection packet loss on unidirectional links. Finally extensive simulations of AODV layered on two-way routing algorithm show that packet
delivery increases substantially in asymmetric networks compared to regular AODV, which only routes on bidirectional links.


Keywords: Mobile ad hoc networks, AODV, DSR, asymetry, bidirectional networks, uni directional link, blacklist.


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