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Journal of Electrical and Computer Engineering
Volume 2015, Article ID 918065, 11 pages
http://dx.doi.org/10.1155/2015/918065
Research Article

Probabilistic Routing Based on Two-Hop Information in Delay/Disruption Tolerant Networks

College of Information Science and Technology, Dalian Maritime University, Dalian 116026, China

Received 18 September 2014; Revised 23 December 2014; Accepted 5 January 2015

Academic Editor: Christian Schlegel

Copyright © 2015 Xu Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate an opportunistic routing protocol in delay/disruption tolerant networks (DTNs) where the end-to-end path between source and destination nodes may not exist for most of the time. Probabilistic routing protocol using history of encounters and transitivity (PRoPHET) is an efficient history-based routing protocol specifically proposed for DTNs, which only utilizes the delivery predictability of one-hop neighbors to make a decision for message forwarding. In order to further improve the message delivery rate and to reduce the average overhead of PRoPHET, in this paper we propose an improved probabilistic routing algorithm (IPRA), where the history information of contacts for the immediate encounter and two-hop neighbors has been jointly used to make an informed decision for message forwarding. Based on the Opportunistic Networking Environment (ONE) simulator, the performance of IPRA has been evaluated via extensive simulations. The results show that IPRA can significantly improve the average delivery rate while achieving a better or comparable performance with respect to average overhead, average delay, and total energy consumption compared with the existing algorithms.