Dynamic Topology Optimization for Assuring Connectivity in Multihop Mobile Optical Wireless Communications Networks

作者：Dwivedi Anurag^*; Harshavardhana Paramasiviah; Velez Paul G; Tebben Daniel J

来源：Johns Hopkins APL Technical Digest, 2011, 30(2): 151-167.

Mobile free-space optical links suffer from frequent link blockages because of opaque obstructions or link degradations, resulting in degraded or failed networks. We present a dynamic layer 1-based topology and routing control methodology for assuring connectivity in networks with fragile links. We describe core components of this methodology, with special emphasis on the dynamic topology optimization algorithm and topology transition schemes. The effectiveness of the proposed methodology depends on the fragility of the links compared with the topology optimization duration. If the link fragility is comparable to the time taken to achieve the optimal topology, then this methodology will not lead to a stable network. For this reason, the frequency and duration of link blockages are characterized for realistic terrains by using modeling and emulation tools incorporating the dynamic network changes experienced in theater networks. Link fragility results for various types of terrain suggest that the expected link longevity is significantly greater than the time taken by the proposed dynamic network optimization scheme. Thus, network connectivity can be greatly improved by using the proposed dynamic topology control methodology and optimization of physical network parameters such as antenna height.

• 出版日期2011