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Delay/Disruptive Tolerant Networks

The idea behind Delay/Disruptive Tolerant Networks (DTN's) is to deal with networks that have discontinous connectivity. These disruptions may be due to several factors, as could be, mobility of nodes, harsh environmental conditions, loss of link connectivity, etc and can produce hugh delays in the delivery of the information, hence the name. There are several ways of solving these disruptions: store-carry-and-forward is one of the ways of attacking the problem, but also it is possible to replicate the information. Of course, these solutions means that the number of copies and the scope in which the replicas are distributed has to be controled.

Opportunistic forwarding based in Epidemic models is one of the techniques used in Mobile Networks with disruptions. In this case, nodes that meet others in the network, handle either a copy or the original packet to a relay that carries the data, sometimes called Delay Tolerant Object, until the destination is reached.

In the research group, we have investigated Opportunistic forwarding based in Epidemic models in several projects such as InfoMob (Information Mobility in Ad Hoc Wireless Networks, June 2008-June 2009), MOPP-NET (Realistic Mobility Modeling for Opportunistic Networking, July 2010-June 2011), and COWHAN (Cooperative and Opportunistic Wireless Heterogeneous Access Networks, 2011-2014). we have applied these techniques to Vehicular Ad Hoc Networks (VANET's) and to Pedestrian Networks. In the last ones, users with a smart-phone or PDA with WiFi/Bluetooth connections deliver DTO's to other users using the store-carry-and-forward networking paradigm.

Moreover, a Spin-off called Miraveo Inc was created by Prof. Jorge GarcĂ­a Vidal and Dr. David Fuste Villela in 2008. Miraveo had unique and patented technology designed to provide extraordinary connectivity capabilities for mobile services. Miraveo technology provided mobile devices the ability to roam through wifi zones, between wifi and 3G, and in areas where there is no cellular infrastructure.