  Through Non-Terrestrial Networks (NTN), a global coverage connecting areas
with minimal or no terrestrial services is envisaged using satellite and
air-borne platforms. However, one of the challenges to delivering NTN
communications is the increased levels of path-loss, relative to typical
terrestrial scenarios, due to the vast communication distance towards satellite
platforms. Typically, cellular IoT technologies adopt frame repetitions where
many redundant data transmissions are included to enhance its success rate.
This can be also extended to satellite links to counter the effect of long
distance communications on the link budget. In this paper, we put forth an
analytic framework that captures the repetition behavior based on the
probability of line-of-sight (LoS), as it heavily influences the propagation
conditions. We analyze the coverage performance in terms of the frame success
rate, which allows us to tune the repetitions behavior to suit a given
satellite admittance region. Furthermore, we obtain an optimal global average
success rate by considering the availability of satellites. The presented
framework can facilitate coverage enhancements for IoT-over-Satellite networks.
