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The IEEE 802.15.4 standard is one of the main communication protocols proposed for wireless sensor networks, IoT 'Internet of Things' and WoT 'Web of Things'. This protocol provides a flexible MAC layer designed to meet a variety of applications. Since WSN is application-specific, it's very difficult to provide a generic solution for all types of applications and topologies. In this paper, the authors focus on delay sensitive applications in star networks. This topology is used in wireless sensor networks for monitoring and control applications. The IEEE 802.15.4 standard provides some quality of service features for real-time data transmission. They identified some limitations of this standard and they proposed an improvement to provide a lower end-to-end delay with respect to energy consumption constraint by optimizing MAC layer.
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