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Modeling of Duty-Cycled MAC Protocols for Heterogeneous WSN with Priorities

Department of Communications, Universitat Politècnica de València (Technical University of Valencia), Camí de Vera s/n, 46022 València, Spain
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This paper is an extended version of our paper published in 2018 9th IFIP International Conference on New Technologies, Mobility and Security (NTMS).
Electronics 2020, 9(3), 467; https://doi.org/10.3390/electronics9030467
Received: 21 January 2020 / Revised: 3 March 2020 / Accepted: 7 March 2020 / Published: 11 March 2020
(This article belongs to the Section Networks)
Wireless Sensor Networks (WSN) have experienced an important revitalization, particularly with the arrival of Internet of Things applications. In a general sense, a WSN can be composed of different classes of nodes, having different characteristics or requirements (heterogeneity). Duty-cycling is a popular technique used in WSN, that allows nodes to sleep and wake up periodically in order to save energy. We believe that the modeling and performance evaluation of heterogeneous WSN with priorities operating in duty-cycling, being of capital importance for their correct design and successful deployment, have not been sufficiently explored. The present work presents a performance evaluation study of a WSN with these features. For a scenario with two classes of nodes composing the network, each with a different channel access priority, an approximate analytical model is developed with a pair of two-dimensional discrete-time Markov chains. Note that the same modeling approach can be used to analyze networks with a larger number of classes. Performance parameters such as average packet delay, throughput and average energy consumption are obtained. Analytical results are validated by simulation, showing accurate results. Furthermore, a new procedure to determine the energy consumption of nodes is proposed that significantly improves the accuracy of previous proposals. We provide quantitative evidence showing that the energy consumption accuracy improvement can be up to two orders of magnitude. View Full-Text
Keywords: discrete-time Markov chain (DTMC) model; duty-cycled MAC protocols; heterogeneous wireless sensor networks; performance evaluation discrete-time Markov chain (DTMC) model; duty-cycled MAC protocols; heterogeneous wireless sensor networks; performance evaluation
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Portillo, C.; Martinez-Bauset, J.; Pla, V.; Casares-Giner, V. Modeling of Duty-Cycled MAC Protocols for Heterogeneous WSN with Priorities. Electronics 2020, 9, 467.

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