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            <title xml:lang="en">Deterministic Computations in Time-Varying Graphs: Broadcasting under Unstructured Mobility</title>
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                <forename type="first">Arnaud</forename>
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                <title xml:lang="en">Deterministic Computations in Time-Varying Graphs: Broadcasting under Unstructured Mobility</title>
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                    <forename type="first">Arnaud</forename>
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                  <title>6th IFIP TC 1/WG 2.2 International Conference on Theoretical Computer Science (TCS) / Held as Part of World Computer Congress (WCC)</title>
                  <date type="start">2010-09-20</date>
                  <date type="end">2010-09-23</date>
                  <settlement>Brisbane</settlement>
                  <country key="AU">Australia</country>
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                <editor>Cristian S. Calude; Vladimiro Sassone</editor>
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              <p>Most highly dynamic infrastructure-less networks have in common that the assumption of connectivity does not necessarily hold at a given instant. Still, communication routes can be available between any pair of nodes over time and space. These networks (variously called delay-tolerant, disruptive-tolerant, challenged) are naturally modeled as time-varying graphs (or evolving graphs), where the existence of an edge is a function of time. In this paper we study deterministic computations under unstructured mobility, that is when the edges of the graph appear infinitely often but without any (known) pattern. In particular, we focus on the problem of broadcasting with termination detection. We explore the problem with respect to three possible metrics: the date of message arrival (foremost), the time spent doing the broadcast (fastest), and the number of hops used by the broadcast (shortest). We prove that the solvability and complexity of this problem vary with the metric considered, as well as with the type of knowledge a priori available to the entities. These results draw a complete computability map for this problem when mobility is unstructured.</p>
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          <orgName>University of Ottawa [Ottawa]</orgName>
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