摘要： Using free space optics (FSO) in the mobile fronthaul/backhaul networks is a promising solution that can potentially enhance the capacity of mobile networks. The main challenge of establishing FSO-based fronthaul/backhaul networks is the dynamic feature of the networks, i.e., the fragile links under adverse weather conditions and the dynamic traf?c demands among small cells. Topology recon?guration is proposed to dynamically rearrange the FSO links. In this paper, two types of network recon?gurations are investigated, in which the proactive network recon?guration is to proactively optimize the topology of the FSO-based fronthaul/ backhaul networks for each speci?c time period based on the statistics of the network, and the reactive recon?guration is to actively adjust the topology when traf?c demands and link states are changed. The proactive network recon?guration is formulated as a mixed integer nonlinear programming (MINLP) problem, which jointly optimizes the network throughput and power consumption of FSO-based fronthaul/backhaul networks. A greedy algorithm is proposed to derive the solution of the proposed problem. After the network topology having been recon?gured by solving the MINLP problem, two reactive recon?guration algorithms are designed to optimally adjust the network topology once a link failure and demand explosion occur, respectively, to further enhance the network throughput and reduce the power consumption. The performance of the algorithms is demonstrated via extensive simulations.