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5G+ systems expect enhancement in data rate and coverage area under limitedpower constraint. Such requirements can be fulfilled by the densification ofsmall cells (SCs). However, a major challenge is the management of fronthaullinks connected with an ultra dense network of SCs. A cost effective andscalable idea of using network flying platforms (NFPs) is employed here, wherethe NFPs are used as fronthaul hubs that connect the SCs to the core network.The association problem of NFPs and SCs is formulated considering a number ofpractical constraints such as backhaul data rate limit, maximum supported linksand bandwidth by NFPs and quality of service requirement of the system. Thenetwork centric case of the system is considered that aims to maximize thenumber of associated SCs without any biasing, i.e., no preference for highpriority SCs. Then, two new efficient greedy algorithms are designed to solvethe presented association problem. Numerical results show a favorableperformance of our proposed methods in comparison to exhaustive search.

Association of Networked Flying Platforms with Small Cells for Network Centric 5G+ C-RAN