Improving the Backhaul link of the 5G Cellular Wireless Networks Using a Triple Hybrid System

The recent and tremendous rise in the number of mobile users demands a parallel increase in the capacity of wireless networks required to achieve higher data rates, lower latency transmissions, and improved service quality.The latter is influenced highly by frequent interruption of wireless service for users at the edge of the cell due to the longer distance from the base station.To overcome this problem and in the meantime improve the capacity of the bottleneck backhaul in dense heterogeneous networks like 5G/6G systems especially in the cell edge regions, a hybrid solution that combines Radio Frequency (RF), Free Space Optics (FSO), and Optical Fiber (OF) links for backhaul transmission is proposed in this paper.In addition, a Backhaul Selection Algorithm (BSA) is suggested to choose the optimum link according to the outage probability analyses.This algorithm not only selects the link with the highest quality but also minimizing power consumption, thereby guaranteeing a consistently high-quality connection without interruptions of services.Using theoretical analyses and thorough simulations, the performance of the hybrid RF/FSO-OF system is evaluated and also compared to the existing state-of-the-art techniques showing the advantages of exploiting the inherited synergies of the proposal along with the selection algorithm.The numerical results reveal that the proposed system brings a considerable reduction in power consumption compared to FSO-and RF-only systems reflecting its superiority under different atmospheric channel conditions.For instance, at SNR threshold of 10 dB, the proposed system required SNR of 20, 25 and 33 dB, respectively, for weak, moderate, and strong atmospheric turbulence conditions in order to reach the outage probability of 10 -6 .