Since untethered sensor nodes operate on battery, and because they must communicate through a multi-hop network, it is vital to optimally configure the transmit power of the nodes both to conserve power and optimize spatial reuse of a shared channel. Current topology control algorithms try to minimize radio power while ensuring connectivity of the network. We propose that another important metric for a sensor network topology will involve consideration of hidden nodes and asymmetric links. Minimizing the number of hidden nodes and asymmetric links at the expense of increasing the transmit power of a subset of the nodes may in fact increase the longevity of the sensor network. In this paper we explore a distributed evolutionary approach to optimizing this new metric. Inspiration from the Particle Swarm Optimization technique motivates a distributed version of the algorithm. We generate topologies with fewer hidden nodes and asymmetric links than a comparable algorithm and present some results that indicate that our topologies deliver more data and last longer.
Date of creation, presentation, or exhibit
Department, Program, or Center
Computer Engineering (KGCOE)
Jason C. Tillett, Shanchieh Jay Yang, Raghuveer M. Rao, Ferat Sahin, "Optimal topologies for wireless sensor networks", Proc. SPIE 5611, Unmanned/Unattended Sensors and Sensor Networks, (30 November 2004); doi: 10.1117/12.578518; https://doi.org/10.1117/12.578518
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