A wireless sensor networks MAC protocol for real-time applications |
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Authors: | E Egea-López J Vales-Alonso A S Martínez-Sala J García-Haro P Pavón-Mariño M V Bueno Delgado |
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Affiliation: | (1) Department of Information Technologies and Communications, Polytechnic University of Cartagena, Cartagena, Spain |
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Abstract: | 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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Keywords: | Wireless sensor networks MAC protocols Real-time applications |
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