4,497 research outputs found
Orion Routing Protocol for Delay-Tolerant Networks
In this paper, we address the problem of efficient routing in delay tolerant
network. We propose a new routing protocol dubbed as ORION. In ORION, only a
single copy of a data packet is kept in the network and transmitted, contact by
contact, towards the destination. The aim of the ORION routing protocol is
twofold: on one hand, it enhances the delivery ratio in networks where an
end-to-end path does not necessarily exist, and on the other hand, it minimizes
the routing delay and the network overhead to achieve better performance. In
ORION, nodes are aware of their neighborhood by the mean of actual and
statistical estimation of new contacts. ORION makes use of autoregressive
moving average (ARMA) stochastic processes for best contact prediction and
geographical coordinates for optimal greedy data packet forwarding. Simulation
results have demonstrated that ORION outperforms other existing DTN routing
protocols such as PRoPHET in terms of end-to-end delay, packet delivery ratio,
hop count and first packet arrival
Using Neighborhood Beyond One Hop in Disruption-Tolerant Networks
Most disruption-tolerant networking (DTN) protocols available in the
literature have focused on mere contact and intercontact characteristics to
make forwarding decisions. Nevertheless, there is a world behind contacts: just
because one node is not in contact with some potential destination, it does not
mean that this node is alone. There may be interesting end-to-end transmission
opportunities through other nearby nodes. Existing protocols miss such
possibilities by maintaining a simple contact-based view of the network. In
this paper, we investigate how the vicinity of a node evolves through time and
whether such information can be useful when routing data. We observe a clear
tradeoff between routing performance and the cost for monitoring the
neighborhood. Our analyses suggest that limiting a node's neighborhood view to
three or four hops is more than enough to significantly improve forwarding
efficiency without incurring prohibitive overhead.Comment: 5 pages, 5 figures, 1 tabl
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