Abstract
Convergecast and broadcast operations in WSN-based applications impose demands in terms of energy efficiency, reliability, and timeliness QoS properties which existing protocols struggle to fulfill. The Deterministic Synchronous Multi-channel Extension (DSME) mechanism introduced in the IEEE 802.15.4e standard constitutes a promising solution to address these stringent QoS requirements, by enabling significant enhancements to the legacy IEEE 802.15.4 protocol, such as multi-channel communications, reduction of the Contention-Access Period, and group acknowledgments. However, the DSME-IEEE 802.15.4e standards do not propose a mechanism to build a traffic-aware schedule that assigns a frequency channel and time-slots to each transmission. Therefore, in this paper, we show how to configure the DSME parameters for the convergecast and broadcast operations while having in mind the above-mentioned QoS properties. In that direction, we propose an exact traffic-aware scheduling algorithm, based on Integer Linear Programming (ILP), that enables the system designers to optimize the configuration of all the required parameters of the DSME-IEEE 802.15.4e so that QoS requirements are met.
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