3,208 research outputs found
Delay Tolerant Networking over the Metropolitan Public Transportation
We discuss MDTN: a delay tolerant application platform built on top of the Public Transportation System (PTS) and able to provide service access while exploiting opportunistic connectivity. Our solution adopts a carrier-based approach where buses act as data collectors for user requests requiring Internet access. Simulations based on real maps and PTS routes with state-of-the-art routing protocols demonstrate that MDTN represents a viable solution for elastic nonreal-time service delivery. Nevertheless, performance indexes of the considered routing policies show that there is no golden rule for optimal performance and a tailored routing strategy is required for each specific case
HYMAD: Hybrid DTN-MANET Routing for Dense and Highly Dynamic Wireless Networks
In this paper we propose HYMAD, a Hybrid DTN-MANET routing protocol which
uses DTN between disjoint groups of nodes while using MANET routing within
these groups. HYMAD is fully decentralized and only makes use of topological
information exchanges between the nodes. We evaluate the scheme in simulation
by replaying real life traces which exhibit this highly dynamic connectivity.
The results show that HYMAD outperforms the multi-copy Spray-and-Wait DTN
routing protocol it extends, both in terms of delivery ratio and delay, for any
number of message copies. Our conclusion is that such a Hybrid DTN-MANET
approach offers a promising venue for the delivery of elastic data in mobile
ad-hoc networks as it retains the resilience of a pure DTN protocol while
significantly improving performance.Comment: 7 pages, 6 figure
Coherent, automatic address resolution for vehicular ad hoc networks
Published in: Int. J. of Ad Hoc and Ubiquitous Computing, 2017 Vol.25, No.3, pp.163 - 179. DOI: 10.1504/IJAHUC.2017.10001935The interest in vehicular communications has increased notably. In this paper, the use of the address resolution (AR) procedures is studied for vehicular ad hoc networks (VANETs). We analyse the poor performance of AR transactions in such networks and we present a new proposal called coherent, automatic address resolution (CAAR). Our approach inhibits the use of AR transactions and instead increases the usefulness of routing signalling to automatically match the IP and MAC addresses. Through extensive simulations in realistic VANET scenarios using the Estinet simulator, we compare our proposal CAAR to classical AR and to another of our proposals that enhances AR for mobile wireless networks, called AR+. In addition, we present a performance evaluation of the behaviour of CAAR, AR and AR+ with unicast traffic of a reporting service for VANETs. Results show that CAAR outperforms the other two solutions in terms of packet losses and furthermore, it does not introduce additional overhead.Postprint (published version
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