Gathering with Minimum Completion Time in Sensor Tree Networks

Jean-Claude Bermond (1) , Luisa Gargano (2) , Adele Rescigno (2)

1 MASCOTTE - Algorithms, simulation, combinatorics and optimization for telecommunications
2 DIA - Dipartimento Informatica ed Applicazioni "Renato M. Capocelli"

Data gathering is a fundamental operation in wireless sensor networks in which data packets generated at sensor nodes are to be collected at a base station. In this paper we suppose that each sensor is equipped with an half–duplex interface; hence, a node cannot receive and transmit at the same time. Moreover, each node is equipped with omnidirectional antennas allowing the transmission over distance R. The network is a multi-hop wireless network and the time is slotted so that one–hop transmission of one data item consumes one time slot. We model the network with a graph where the vertices represent the nodes and two nodes are connected if they are in the transmission range of each other. We suppose that the interference range is the same as the transmission range; therefore due to interferences a collision happens at a node if two or more of its neighbors try to transmit at the same time. Furthermore we suppose that an intermediate node should forward a message as soon as it receives it. We give an optimal collision free gathering schedule for tree networks whenever each node has exactly one data packet to send.

Mots clés: Data gathering; omnidirectional antennas; time; tree sensor networks

Domaines: Algorithme et structure de données [cs.DS]; Réseaux et télécommunications [cs.NI]

Jean-Claude Bermond, Luisa Gargano, Adele Rescigno. Gathering with Minimum Completion Time in Sensor Tree Networks. Journal of Interconnection Networks, 2010, 11 (1-2), pp.1-33. ⟨10.1142/S0219265910002714⟩. ⟨hal-00535816⟩