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Abstract(s)
While the IEEE 802.15.4/Zigbee protocol stack is being
considered as a promising technology for low-cost low-power
Wireless Sensor Networks (WSNs), several issues in the standard
specifications are still open. One of those ambiguous issues is how
to build a synchronized multi-hop cluster-tree network, which is
quite suitable for ensuring 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 multihop
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 a synchronization
mechanism based on Time Division Beacon Scheduling to
construct cluster-tree WSNs. We also propose a methodology for
an efficient duty cycle management in each router (cluster-head) of
a cluster-tree WSN that ensures the fairest use of bandwidth
resources. The feasibility of the proposal is clearly demonstrated
through an experimental test bed based on our own implementation
of the IEEE 802.15.4/Zigbee protocol.
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Publisher
IEEE