Search for: [Description = "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"]

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