A wireless sensor networks MAC protocol for real-time applications.
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AuthorEgea López, Estebán; Vales Alonso, Javier; Martínez Sala, Alejandro Santos; García Haro, Juan; Pavón Mariño, Pablo; [et al.]
Knowledge AreaIngeniería Telemática
SponsorsThis work has been cofunded by the Economy, Industry and Innovation Council, with the SOLIDMOVIL project (2I04SU044), supported by Fundacion Seneca, from the Region of Murcia with the ARENA Project (00546/PI/04), with the ARPaq project (TEC2004-05622-C04-02/TCM) by the Spanish Research Council and the CSI-RHET project (TEC2005-08068-C04-01/TCM).
Bibliographic CitationEGEA LÓPEZ, E., VALES ALONSO, J., MARTÍNEZ SALA, A., GARCÍA HARO, J., PAVÓN MARIÑO, P., BUENO DELGADO, M.V., A wireless sensor networks MAC protocol for real-time applications. Personal and Ubiquitous Computing, vol.12 (2): 111-122, January 2008. ISSN 1617-4917
KeywordsWireless sensor networks
Wireless Sensor Networks (WSN) are designed for data gathering and processing, with particular requirements: low hardware complexity, low energy consumption, special traffic pattern support, scalability, and in some cases, real-time operation. In this paper we present the Virtual TDMA for Sensors (VTS) MAC protocol, which intends to support the previous features, focusing particularly on real-time operation. VTS adaptively creates a TDMA arrangement with a number of timeslots equal to the actual number of nodes in range. Thus, VTS achieves an optimal throughput performance compared to TDMA protocols with fixed size of frame. The frame is set up and maintained by a distributed procedure, which allows sensors to asynchronously join and leave the frame. In addition, duty cycle is increased or decreased in order to keep latency constant below a given deadline. Therefore, a major advantage of VTS is that it guarantees a bounded latency, which allows soft real-time applications.
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