  The Sixth Generation (6G) of mobile networks is expected to use carrier
frequencies in the spectrum above 100 GHz, to satisfy the demands for higher
data rates and bandwidth of future digital applications. The development of
networking solutions at such high frequencies is challenged by the harsh
propagation environment, and by the need for directional communications and
signal processing at high data rates. A fundamental step in defining and
developing wireless networks above 100 GHz is given by an accurate performance
evaluation. For simulations, this strongly depends on the accuracy of the
modeling of the channel and of the interaction with the higher layers of the
stack. This paper introduces the implementation of two recently proposed
channel models (based on ray tracing and on a fully stochastic model) for the
140 GHz band for the ns-3 TeraSim module, which enables simulation of macro
wireless networks in the sub-terahertz and terahertz spectrum. We also compare
the two channel models with full-stack simulations in an indoor scenario,
highlighting differences and similarities in how they interact with the
protocol stack and antenna model of TeraSim.
