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Link fragility and longevity in directional networks

Mobile Free Space Optical (FSO) and directional RF communications links suffer from frequent link blockages due to opaque obstructions that can result in degraded or failed networks. In this paper, a methodology is presented for assuring connectivity in networks with fragile links. The frequency and duration of link blockages are characterized using modeling and emulation tools developed for realistic terrain. Link fragility results for various types of terrain suggest that the network connectivity can be greatly improved by using a dynamic topology control methodology and optimization of physical network parameters such as antenna elevation.