# Hardness and approximation of Gathering in static radio networks

1 MASCOTTE - Algorithms, simulation, combinatorics and optimization for telecommunications
CRISAM - Inria Sophia Antipolis - Méditerranée , COMRED - COMmunications, Réseaux, systèmes Embarqués et Distribués
Abstract : In this paper, we address the problem of gathering information in a specific node (or \emph{sink}) of a radio network, where interference constraints are present. We take into account the fact that, when a node transmits, it produces interference in an area bigger than the area in which its message can actually be received. The network is modeled by a graph; a node is able to transmit one unit of information to the set of vertices at distance at most $\dt$ in the graph, but when doing so it generates interference that does not allow nodes at distance up to $\di$ ($\di \ge \dt$) to listen to other transmissions. Time is synchronous and divided into time-steps in each of which a round (set of non-interfering radio transmissions) is performed. We give general lower bounds on the number of rounds required to gather into a sink of a general graph, and present an algorithm working on any graph, with an approximation factor of 4. We also show that the problem of finding an optimal strategy for gathering is \textsc{NP-hard}, for any values of $\di$ and $\dt$. If $\di>\dt$, we show that the problem remains hard when restricted to the uniform case where each vertex in the network has exactly one piece of information to communicate to the sink.
Type de document :
Article dans une revue
Parallel Processing Letters, World Scientific Publishing, 2006, 16 (2), pp.165-183
Domaine :

https://hal.inria.fr/inria-00430158
Contributeur : Jean-Claude Bermond <>
Soumis le : jeudi 5 novembre 2009 - 18:34:51
Dernière modification le : mercredi 31 janvier 2018 - 10:24:04
Document(s) archivé(s) le : jeudi 17 juin 2010 - 19:32:41

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BGK_06c.pdf
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• HAL Id : inria-00430158, version 1

### Citation

Jean-Claude Bermond, Jérôme Galtier, Ralf Klasing, Nelson Morales, Stéphane Pérennes. Hardness and approximation of Gathering in static radio networks. Parallel Processing Letters, World Scientific Publishing, 2006, 16 (2), pp.165-183. 〈inria-00430158〉

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