JOURNAL OF NETWORKS (JNW)
ISSN : 1796-2056
Volume : 1    Issue : 6    Date : November/December 2006

Dependability Considerations in Wireless Sensor Networks Applications
Amirhosein Taherkordi, Majid Alkaee Taleghan, and Mohsen Sharifi
Page(s): 28-35
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Abstract
Recently, the use of wireless sensor networks has spread to applications areas that are not viable
or costefficient to be run on other types of networks. Due to some critical tasks done in these types
of networks, the majority of sensor networks applications should be dependable and should be run
continuously and reliably without interruption. Hence, the two more significant dependability factors
that should be nowadays taken into account in developing wireless sensor networks applications
are ‘availability’ and ‘reliability’ of application services. The specific characteristics and constraints
of wireless sensor networks require a different interpretation of these two factors when developing
applications for such networks. In this paper, we propose a middleware layer mechanism for
satisfying these two factors as more important dependability issues in sensor networks
applications. We propose an event-based middleware service that is specifically designed for
wireless sensor networks in which a group of sensor nodes forms a cluster and a replicated
service is run on each cluster head. The communication model among cluster members and
cluster head is based on the publish/subscribe scheme. We show how the replicated services and
communication model in cluster nodes satisfy dependability issues and increase the availability
and reliability of applications running under the proposed middleware.

Index Terms
wireless sensor networks, dependability, middleware, publish/subscribe, event-based