ISSN : 1796-203X
Volume : 1    Issue : 5    Date : August 2006

An Infrastructure for Service Oriented Sensor Networks
Åke Östmark, Jens Eliasson, Per Lindgren, Aart van Halteren and Lianne Meppelink
Page(s): 20-29
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Emerging wireless technologies enable ubiquitous access to networked services. Integration of
wireless technologies into sensor and actuator nodes provides the means for remote access and
control. However, ad hoc deployment of nodes complicates the process of finding, selecting and
using these in a meaningful way. The use of a service discovery framework enables nodes to
present themselves and the resources they hold. In this paper, we review the applicability of a
number of well-known service discovery protocols in the context of networked nodes. Multicast DNS
and Service Discovery (mDNS-SD) stands out with its auto-configuration, distributed architecture,
sharing of resources, and wide area access. For wireless battery operated and resource
constrained nodes, we seek to integrate SD and power management techniques. This leads
us to a standards based infrastructure for service oriented sensor networks where; 1) nodes
collaborate in an ad hoc fashion by using SD techniques to discover (and announce) resources
locally and over the public Internet, 2) nodes preserve power through aggressive utilization of low
power (sleep) modes, while yet being reachable for clients according to defined schemas, and 3)
clients may access and configure nodes, and (if possible) access sleeping nodes by implicit
wake-up procedures. To demonstrate the proposed infrastructure a complete experimental setup
has been devised featuring; Bluetooth enabled nodes, lightweight implementations of mDNS-SD
and communication stacks, Internet access through cellular/wired gateways, together with a public
DNS server. Our experiments verify that mDNS-SD can be effectively deployed on small wireless
sensor and actuator nodes and provides the basis of a service oriented infrastructure for low power

Index Terms
Service discovery, wireless sensor, sensor networks, activation schedule, low power, ad hoc.