Networked and Embedded Systems Laboratory

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Sensor networks consist of autonomous wireless sensor nodes that are networked together
in an ad-hoc fashion. The tiny nodes are equipped with substantial processing capabilities, enabling
them to combine and compress their sensor data. The aim is to limit the amount of network traffic, and
as such conserve the nodes’ limited battery energy. However, due to the small packet payload, the MAC
header is a significant, and energy-costly, overhead. To remedy this, we propose a novel scheme for
MAC address assignment. The two key features which make our approach unique are the exploitation
of spatial address reuse and an encoded representation of the addresses in data packets. To assign the
addresses, we develop a purely distributed algorithm that relies solely on local messsage exchanges.
Other salient features of our approach are the ability to handle unidirectional links and the excellent
scalability of both the assignment algorithm and address representation. In typical scenarios, the MAC
overhead is reduced by a factor of three compared to existing approaches.

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