Information Technology Reference
In-Depth Information
Chapter 7
High Level Definition of
Event-Based Applications
for Pervasive Systems
Steffen Ortmann
IHP Microelectronics, Germany
Michael Maaser
IHP Microelectronics, Germany
Peter Langendoerfer
IHP Microelectronics, Germany
ABSTRACT
Within pervasive intelligent environments, Wireless Sensor Networks (WSNs) will surround and serve
us at any place and any time. A proper usability is considered essential for WSNs supporting real life
applications. With this chapter, we aim at ease of use for specifying new applications that have to au-
tonomously cope with expected and unexpected heterogeneity, sudden failures, and energy efficiency.
Starting with general design criteria for applications in WSNs, we created a user-centric design flow for
pervasive applications. The design flow provides very high abstraction and user guidance to refrain the
user from implementation-, deployment- and hardware-details including heterogeneity of the available
sensor nodes. Automatic event configuration is accomplished by using a flexible Event Specification
Language (ESL) and Event Decision Trees (EDTs) for distributed detection and determination of real
world phenomena. EDTs autonomously adapt to heterogeneous availability of sensing capabilities by
pruning and subscription to other nodes for missing information. We present one of numerous simulated
scenarios proving the robustness and energy efficiency with regard to the required network communi-
cations. From these, we learned how to deduce appropriate bounds for configuration of collaboration
region and leasing time by asking for expected properties of the phenomena to be detected.
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