Abstract:
Delay-tolerant (DTN) networks are the result of the evolution of mobile networks where
there may be no end-to-end path. It enables communication between source and destination
without the support of a fixed network infrastructure. The main principle of delay tolerant
networks for message routing is the store-transport-forward approach, in which intermediate
nodes store data for transmission until they find a suitable relay node to deliver messages on
route to the target destination node. And DTN has many applications in the DTN network,
such as wildlife monitoring, disaster management, assistance in detecting the movement of
vehicles and traffic jams and military battlefields.
Several routing and forwarding strategies have been proposed in recent years. The main
difference between the various DTN routing protocols is the amount of knowledge available
to route messages. The store-carry and forwarding approach of DTN routing protocols
generates many copies of a message on networks that consume node resources such as energy
and buffer space.
The main challenge for delay tolerant networks is how to develop energy- efficient routing
strategies and use fewer network resources. This study focuses on the proposed energy efficient DTN routing strategy to tackle routing problems using node energy and distance to
node information. Also investigate the performance of the DTN routing protocol with the
metrics delivery ratio, overhead ratio and hopcount using the Opportunistic Network
Environment (ONE) simulator.
The evaluation compares the proposed energy efficient routing strategy with the per hop
routing strategy in terms of delivery ratio, overhead ratio, and hopcount. The results show
that the energy efficient routing strategy outperforms on per hop routing with a higher
message delivery ratio, less overhead and higher hop counts. At optimal message generation
time intervals, delivery ratio of energy efficient routing strategy (EERs) is 91% for energy
efficient routing strategy and while 88% per hop routing respectively. In terms of overhead
ratio, energy efficient routing strategy is less than per hop routing strategy.
