Abstract
The IEEE 802.15.4 is designed for low data rate low power wireless personal area networks (LR-WPANs). LR-WPANs are envisioned for a variety of wireless sensor applications: health monitoring, commercial, agriculture, home and industrial automation. A significant feature of IEEE 802.15.4 is the very low duty cycle operation to preserve sensor node's energy. In this paper, we propose a delay mitigation dynamic scheduling algorithm (DMDSA) that adjusts super-frame structure. In DMDSA, the PAN coordinator adjusts both parameters beacon order (BO) and super-frame order (SO) concurrently based on different metrics: number of PAN source members, application defined data rate, observed end-to-end latency and receive ratio. These parameters are adjusted dynamically when delay is observed during communication. Detailed simulation analysis shows that DMDSA is capable of meeting application's delay requirements by dynamically scheduling the super-frame structure. As compared to IEEE 802.15.4, DMDSA decreases the latency of communication, increases the throughput, and increases network life time.
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