  Predictions for wireless and mobile Internet access suggest exponential
traffic increase particularly in inbuilding environments. Non-traditional
actors such as facility owners have a growing interest in deploying and
operating their own indoor networks to fulfill the capacity demand. Such local
operators will need spectrum sharing with neighboring networks because they are
not likely to have their own dedicated spectrum. Management of inter-network
interference then becomes a key issue for high capacity provision. Tight
operator-wise cooperation provides superior performance, but at the expense of
high infrastructure cost and business-related barriers. Limited coordination on
the other hand causes harmful interference between operators which in turn will
require even denser networks. In this paper, we propose a techno-economic
analysis framework for investigating and comparing the strategies of the indoor
operators. We refine a traditional network cost model by introducing new
inter-operator cost factors. Then, we present a numerical example to
demonstrate how the proposed framework can help us comparing different operator
strategies. Finally, we suggest areas for future research.
