Scheduling Support for Guaranteed Time Services in IEEE 802.15.4 Low Rate WPAN
RTCSA '05 Proceedings of the 11th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications
ECRTS '06 Proceedings of the 18th Euromicro Conference on Real-Time Systems
GTS allocation analysis in IEEE 802.15.4 for real-time wireless sensor networks
IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
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The IEEE 802.15.4 Wireless Personal Area Networking standard, which was designed for low-data-rate and low-energy-demanding wireless networking technologies such as wireless sensor networks, provides a Guaranteed Time Slot (GTS) algorithm that offers the nodes requiring low-latency channel access to reserve contention-free time slots. However, the standard limits the number of simultaneously allocated GTSs to seven, which increases the failure rate of accommodating a growing demand for GTS allocation. This paper introduces an enhanced priority-based GTS algorithm for the IEEE 802.15.4 standard. The proposed algorithm allows the nodes with similar sensing tasks and within close proximity of each other, to prioritize their channel access based on their remaining energy. The performance of the proposed algorithm was experimentally evaluated and the results demonstrated an enhancement over the standard GST algorithm of up to 20% in both consumed energy and GTS allocation latency.