Networked and Embedded Systems Laboratory

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Wireless ad hoc sensor networks have
emerged as one of the key growth areas for wireless
networking and computing technologies. So far these
networks/systems have been designed with static and
custom architectures for specific tasks, thus providing
inflexible operation and interaction capabilities. Our
vision is to create sensor networks that are open to
multiple transient users with dynamic needs. Working
towards this vision, we propose a framework to define
and support lightweight and mobile control scripts that
allow the computation, communication, and sensing
resources at the sensor nodes to be efficiently harnessed
in an application-specific fashion. The
replication/migration of such scripts in several sensor
nodes allows the dynamic deployment of distributed
algorithms into the network. Our framework,
SensorWare, defines, creates, dynamically deploys, and
supports such scripts. Our implementation of
SensorWare occupies less than 180Kbytes of code
memory and thus easily fits into several sensor node
platforms. Extensive delay measurements on our iPAQbased
prototype sensor node platform reveal the small
overhead of SensorWare to the algorithms (less than
0.3msec in most high-level operations). In return the
programmer of the sensor network receives
compactness of code, abstraction services for all of the
node’s modules, and in-built multi -user support.
SensorWare with its features apart from making
dynamic programming possible it also makes it easy
and efficient without restricting the expressiveness of
the algorithms.

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