  Despite such challenges as high path loss and equipment cost, THz
communication is becoming one of the potentially viable means through which
ultra-high data rate can be achieved. To compensate for the high path loss, we
present parameter modeling for indoor THz communication. To maximize efficient
and opportunistic use of resources, we analyze the potential workarounds for a
single access point to satisfy most of the mobile terminals by varying such
parameters as humidity, distance, frequency windows, beamwidths, antenna
placement, and user mobility type. One promising parameter is antenna
beamwidth, where narrower beams results in higher antenna gain. However, this
can lead to "\textit{beamwidth dilemma}" scenario, where narrower beamwidth can
result in significant outages due to device mobility and orientation. In this
paper, we address this challenge by presenting a mobility model that performs
an extensive analysis of different human mobility scenarios, where each
scenario has different data rate demands and movement patterns. We observe that
for mobile users, there are optimal beamwidths that are affected by the
mobility type (high mobility, constrained mobility, and low mobility) and AP
placement.
