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Docta Complutense author Recas Piorno, Joaquín author Khaled, Nadia author Del Barrio García, Alberto Antonio author Hermida Correa, Román 2023-06-19T14:54:49Z 2023-06-19T14:54:49Z 2014-10 1051-2004 10.1016/j.dsp.2014.07.005 https://hdl.handle.net/20.500.14352/34741 http://dx.doi.org/10.1016/j.dsp.2014.07.005 The IEEE-802.15.4 standard is poised to become the global standard for low data rate, low energy consumption Wireless Sensor Networks. By assigning the same sets of contention access parameters for all data frames and nodes, the Contention Access Period (CAP) of the slotted IEEE-802.15.4 currently provides an even channel access functionality and no service differentiation. However, some applications may require service differentiation and traffic prioritization support to accommodate high-priority traffic (e.g., alarms). In order to simulate a scenario in which different sets of access parameters for different node classes can be configured, this paper develops a Markov-chainbased model of the CAP of the IEEE-802.15.4-MAC. Our Markov model can be used to evaluate the impact of mixing node classes in important factors like the throughput, energy consumption, probability of delivery and the packet latency. The model has been used to provide traffic differentiation in a high saturation scenario in which a set of nodes can be configured to increase 76% the probability of sending a packet and reduce 58% latency, with a 69% energy penalty, in comparison with a standard scenario. The accuracy of the Markov model is validated by extensive ns-2 simulations. eng Generic Markov Model of the Contention Access Period of IEEE 802.15.4 MAC Layer journal article URL https://docta.ucm.es/bitstreams/9638d1f2-9950-47a8-a9b9-7cd2cc8a8a3b/download File MD5 449163feaaff63388f9b2ec6a32f32da 693779 application/pdf markov_chains.pdf URL https://docta.ucm.es/bitstreams/bc76d43e-1b16-4d6f-bb20-9644c12f8a0d/download File MD5 2a44bf97c090c694c41c5de711f397f6 62598 text/plain markov_chains.pdf.txt