Real-time Communication over Cluster-tree Wireless Sensor Networks
Ref: HURRAY-TR-101001 Publication Date: 5, Oct, 2010
Real-time Communication over Cluster-tree Wireless Sensor Networks
Ref: HURRAY-TR-101001 Publication Date: 5, Oct, 2010Abstract:
Modelling and simulation of the fundamental performance limits of Wireless
Sensor Networks (WSNs) is of paramount importance to understand their
behaviour under the worst-case conditions and to make the appropriate design
choices. This is particular relevant for time-sensitive WSN applications,
where the timing behaviour of the network protocols impacts on the correct
operation of these applications. Furthermore, energy efficiency is a key
requirement to be fulfilled in these applications since the wireless nodes
are usually battery-powered. In that direction this thesis contributes with
an accurate simulation model of the IEEE 802.15.4/ZigBee protocols and an
analytical methodology for the worst-case analysis and dimensioning of a
static or even dynamically changing cluster-tree WSN where the data sink can
either be static or mobile. The thesis is focused on the study of WSNs with
cluster-tree topology because it supports predictable and energy efficient
behaviour, which is suited for time-sensitive applications using
battery-powered nodes. On the other side, in contrast with the star and mesh
topologies, the cluster-tree topology expresses several challenging and open
research issues such as a precise cluster scheduling to avoid inter-cluster
collisions (messages/beacons transmitted from nodes in different overlapping
clusters). Hence, the next objective is to
find the collision-free periodic schedule of clusters' active portions,
called Time Division Cluster Schedule (TDCS), while minimizing the energy
consumption of the nodes and meeting all data flows' parameters. The thesis
also shows how to apply the proposed methodologies to the specific case of
IEEE 802.15.4/ZigBee beacon enabled cluster-tree WSNs, as an illustrative
example that confirms the applicability of general approach for specific
protocols. Finally, the validity and accuracy of the simulation model and
methodologies are demonstrated through the comprehensive experimental and
simulation studies. Using the proposed analytical methodologies and
simulation model, system designers are able to easily configure the IEEE
802.15.4/ZigBee cluster-tree WSN for a given application-specific Quality of
Service (QoS) requirements prior to the network deployment.
Petr JurcikDocument:
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DownloadPhD Thesis, Faculty of Electrical Engineering, Czech Technical University in Prague.
Prague, Czechia.
Record Date: 5, Oct, 2010