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1 Journal of Telecommunications and Information Technology

1 2020

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Modeling and Analysis of Additional Clear Channel Assessment to Improve Performance of IEEE 802.15.4-based MAC Protocol

Asuti Manjunath G., Basarkod Prabhugoud I.

Journal of Telecommunications and Information Technology

2020

nr 3

10--21

Design of the MAC protocol is crucial in all wireless sensor networks (WSNs) due to its inﬂuence on the performance of the transceiver, i.e. the most energy-consuming component of each sensor node. A mechanism known as “carrier sense multiple access with collision avoidance” (CSMA/CA) is used for accessing the wireless channel in the IEEE 802.15.4 standard-based MAC protocol in order to avoid collisions between the network’s communicating nodes. CSMA/CA relies on two clear channel assessments (CCA=2) for checking the status of the channel. In this paper, we develop an additional CCA algorithm for the two scenarios encountered in star topology-enabled WSNs. Next, we investigate the impact of an additional clear channel assessment (CCA=3) on performance in IEEE 802.15.4. We develop a Markov chain model for the proposed methodology, and validate it using Matlab. Simulation results show that there is a signiﬁcant improvement of performance metrics in the IEEE 802.15.4 standard-based MAC protocol with an additional CCA.