  Ultra-densification of user equipment (UE) and access points (APs) are
anticipated to take a toll on the future spectrum needs. Higher frequency
bands, such as mmWave ($30$-$300GHz$) and THz spectrum ($0.3$-$10THz$), can be
used to cater to the high-throughput needs of ultra-dense networks. These
high-frequency bands have a tremendous amount of \textit{green-filed contiguous
spectrum}, ranging in hundreds of $GHz$. However, these bands, especially the
THz bands, face numerous challenges, such as high spreading, absorption, and
penetration losses. To combat these challenges, the THz-APs need to be either
equipped with high transmit power, high antenna gains (i.e., narrow antenna
beams), or limit the communication to short-ranges. All of these factors are
bounded due to technical or economic challenges, which will result in a
\textit{"distance-power dilemma"} while deciding on the deployment strategy of
THz-APs. In this paper, we present an analytical model to deploy THz-APs in an
indoor setting efficiently. We further show through extensive numerical
analysis, the optimal number of APs and optimal room length for different
blocks of the THz spectrum. Furthermore, these THz-APs need to be efficiently
packed to avoid outages due to handoffs, which can add more complexity to the
dilemma. To mitigate the packing problem, we propose two solutions over the
optimal solution: (a) Radius Increase, and (b) Repeater Assistance, and present
an analytical model for each.
