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Advisor(s)
Abstract(s)
The recently standardized IEEE 802.15.4/Zigbee
protocol stack offers great potentials for ubiquitous and pervasive
computing, namely for Wireless Sensor Networks (WSNs).
However, there are still some open and ambiguous issues that turn
its practical use a challenging task. One of those issues is how to
build a synchronized multi-hop cluster-tree network, which is
quite suitable for QoS support in WSNs. In fact, the current IEEE
802.15.4/Zigbee specifications restrict the synchronization in the
beacon-enabled mode (by the generation of periodic beacon
frames) to star-based networks, while it supports multi-hop
networking using the peer-to-peer mesh topology, but with no
synchronization. Even though both specifications mention the
possible use of cluster-tree topologies, which combine multi-hop
and synchronization features, the description on how to effectively
construct such a network topology is missing. This paper tackles
this problem, unveils the ambiguities regarding the use of the
cluster-tree topology and proposes two collision-free beacon
frame scheduling schemes. We strongly believe that the results
provided in this paper trigger a significant step towards the
practical and efficient use of IEEE 802.15.4/Zigbee cluster-tree
networks.