Energy and spectral efficiency are the mainchallenges in 5th generation of mobile cellular networks.In this paper, we propose an optimization algorithmto optimize the energy efficiency by maximizing thespectral efficiency. Our simulation results show a significantincrease in terms of spectral efficiency as well asenergy efficiency whenever the mobile user is connectedto a low power indoor base station. By applying theproposed algorithm, we show the network performanceimprovements up to 9 bit/s/Hz in spectral efficiency and20 Gbit/Joule increase in energy efficiency for the mobileuser served by the indoor base station rather than by theoutdoor base station
