On the Resilient Network Design of Free-Space Optical Wireless Network for Cellular Backhauling
Yuan Li , Nikolaos Pappas , Vangelis Angelakis , Michał Pióro , Di Yuan
AbstractWith the densification of nodes in cellular networks, free-space optics (FSO) connections are becoming an appealing low cost and high rate alternative to copper and fiber backhaul solutions for wireless communication systems. To ensure a reliable cellular backhaul, provisions for redundant, disjoint paths between the nodes must be made in the design phase. This chapter aims at finding a cost-effective solution to upgrade the cellular backhaul with pre-deployed optical fibers using FSO links and mirror components. A novel integer linear programming model to approach optimal FSO backhaul design, guaranteeing K-disjoint paths connecting each node pair is presented. Next, a column generation method to a path-oriented mathematical formulation is developed. Applying the method in a sequential manner enables high computational scalability. Realistic scenarios are used to demonstrate the proposed approaches which efficiently provide optimal or near-optimal solutions, and thereby allow accurate dealing with the trade-off between cost and reliability.
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