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Analysis of CSMA/CA in IEEE 802.15.4

Analysis of CSMA/CA in IEEE 802.15.4

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The release of IEEE 802.15.4 medium access control and physical layer specifications, employing carrier sense multiple access/collision avoidance (CSMA/CA) strategies, represents a significant milestone in promoting deployment of wireless sensor networks. In this study, the authors first analyse the performance of the slotted CSMA/CA strategy specified in the contention access period (CAP) of IEEE 802.15.4 by integrating the discrete-time Markov chain models of the node states and the channel states; and then, extend the Markov chain models by adopting a modification to the CAP. The extended models could be used to analyse the performance of the unslotted CSMA/CA strategy specified in IEEE 802.15.4 as well as that of the slotted CSMA/CA strategy. Extensive simulations demonstrate the accuracy and effectiveness of the proposed models and conclusions.


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      • (2007) Part 15.4: wireless medium access control (MAC) and physical layer (PHY) specifications for low-rate wireless personal area networks (LR-WPANs).
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      • Pollin, S., Ergen, M., Ergen, S.C.: `Performance analysis of slotted carrier sense IEEE 802.15.4 acknowledged uplink transmissions', Proc. Int. Conf. IEEE WCNC, Las Vegas, NV, USA, p. 1559–1564, 31 March–3 April 2008.
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