Multihop-Delivery-Quality-Based Routing in DTNs


In delay-tolerant networks (DTNs), stable end-to-end connections don't perpetually exist. Messages are forwarded, assisted by the mobility of nodes, in an exceedingly store–carry–forward paradigm. The mobility of nodes in most DTNs features a bound statistical regularity; so, using historical info in DTNs to compute the delivery quality of nodes can facilitate to select smart forwarding nodes. This paper aims to ascertain a routing theme based mostly on multihop delivery quality, that is designed to reduce the energy consumption of message forwarding while maintaining a high delivery rate. We characterized the multihop delivery quality of each node with an expected delay and an expected chance, parameterized by the remaining hop count. Primarily based on these two quality metrics, we have a tendency to developed two algorithms, particularly, the delay-inferred forwarding (DIF) algorithm and also the chance-inferred forwarding (PIF) algorithm. The basic idea of DIF and PIF is to find the optimal forwarding path by minimizing the expected delay and by maximizing the expected probability, respectively, in the hop graph that's outlined in this paper. We tend to performed extensive trace-driven simulations to compare our algorithm to alternative representative routing algorithms using several real traces. We tend to observed the subsequent: 1) Compared with the delegation algorithm, that uses one-hop delivery quality, both DIF and PIF significantly improve the message delivery rate, and that they yield more improvements as the mobility of nodes becomes more regular; and a couple of) compared with the state-of-the-art optimal opportunistic forwarding (OOF) algorithm, which additionally uses a multihop delivery quality, DIF and PIF have considerably smaller forwarding overhead (with the maximum reduction in the amount of forwarding being over 40percent), whereas they're quite close to OOF in terms of both delivery rate and average delay.

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