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Temporal network optimization subject to connectivity constraints.

Mertzios, G.B. and Michail, O. and Chatzigiannakis, I. and Spirakis, P.G. (2013) 'Temporal network optimization subject to connectivity constraints.', in Automata, languages, and programming : 40th international colloquium, ICALP 2013, Riga, Latvia, July 8 - 12, 2013, proceedings, part II. Berlin, Heidelberg: Springer, pp. 657-668. Lecture notes in computer science. (7966).


In this work we consider temporal networks, i.e. networks defined by a labeling λ assigning to each edge of an underlying graph G a set of discrete time-labels. The labels of an edge, which are natural numbers, indicate the discrete time moments at which the edge is available. We focus on path problems of temporal networks. In particular, we consider time-respecting paths, i.e. paths whose edges are assigned by λ a strictly increasing sequence of labels. We begin by giving two efficient algorithms for computing shortest time-respecting paths on a temporal network. We then prove that there is a natural analogue of Menger’s theorem holding for arbitrary temporal networks. Finally, we propose two cost minimization parameters for temporal network design. One is the temporality of G, in which the goal is to minimize the maximum number of labels of an edge, and the other is the temporal cost of G, in which the goal is to minimize the total number of labels used. Optimization of these parameters is performed subject to some connectivity constraint. We prove several lower and upper bounds for the temporality and the temporal cost of some very basic graph families such as rings, directed acyclic graphs, and trees.

Item Type:Book chapter
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Date accepted:No date available
Date deposited:22 June 2015
Date of first online publication:2013
Date first made open access:No date available

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