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In recent years, 5G cellular networks utilization has rapidly increased and is expected to grow even more in the near future. This will put the current cellular networks operators in a challenge to overcome the network's limits to satisfy the increasing mobile data traffic and the proliferation of user demands in deploying mobile applications. The deployment of cache-enabled small base stations (Femtocells) is a promising solution to reduce the backhaul traffic loading and the file-access latency and therefore decrease the cellular network operational costs. Due to the limited cache capacity when compared with the number of files that can be requested by users, in this paper, we formulate the problem of minimizing the cost paid by the cellular network while satisfying the cache capacity as an integer linear program (ILP). Due to the NP-completeness of the ILP formulation and the difficulty of obtaining the file request …