Abstract
Connectivity in wireless sensor networks may be established using either omnidirectional or directional antennae. The former radiate power uniformly in all directions while the latter emit greater power in a specified direction thus achieving increased transmission range and encountering reduced interference from unwanted sources. Regardless of the type of antenna being used the transmission cost of each antenna is proportional to the coverage area of the antenna. It is of interest to design efficient algorithms that minimize the overall transmission cost while at the same time maintaining network connectivity. Consider a set S of n points in the plane modeling sensors of an ad hoc network. Each sensor is equipped with a fixed number of directional antennae modeled as a circular sector with a given spread (or angle) and range (or radius). Construct a network with the sensors as the nodes and with directed edges (u,v) connecting sensors u and v if v lies within u’s sector. We survey recent algorithms and study trade-offs on the maximum angle, sum of angles, maximum range, and the number of antennae per sensor for the problem of establishing strongly connected networks of sensors.
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In all figures boldface arrows represent the newly added edges.
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Acknowledgement
Many thanks to the anonymous referees for useful suggestions that improved the presentation. Research supported in part by NSERC (Natural Sciences and Engineering Research Council of Canada), MITACS (Mathematics of Information Technology and Complex Systems), and CONACyT (Consejo Nacional de Ciencia y Tecnología) grants.
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Kranakis, E., Krizanc, D., Morales, O. (2011). Maintaining Connectivity in Sensor Networks Using Directional Antennae. In: Nikoletseas, S., Rolim, J. (eds) Theoretical Aspects of Distributed Computing in Sensor Networks. Monographs in Theoretical Computer Science. An EATCS Series. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-14849-1_3
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