  The introduction of virtualization techniques in radio cellular networks
allows the emergence of a business based on the outsourcing of towers hosting
antennas and operated by the so-called Tower Companies (TowerCos). In this
paper, we develop a baseline business model for studying the potential
relationships between network operators and TowerCos. It turns out that the
gain in operational costs achieved when network operators outsource the
management of towers can be gracefully utilized to reduce prices so as to
attract more customers. The price drop has however to be carefully realized so
as not to break the market share between operators and to preserve competition.
To prove this claim, we adopt in a first step a centralized optimization
formulation. In a second step, we develop a game theoretic framework.
