Which spectrum is primarily used for up-link communication in terrestrial gateways?

In terrestrial gateways, up-link communication typically occurs in the frequency range of 29.1 - 29.3 GHz. This frequency band is designated for transmitting signals from ground stations to satellites, making it suitable for such applications.

The utilization of this frequency range is well-suited for up-link communication because it allows for higher data rates and efficient signal propagation. Frequencies within this band are less prone to atmospheric attenuation and support the bandwidth needed for modern communication systems, ensuring reliable connections with satellite systems.

The choices related to other frequency ranges do not align as closely with the typical configurations used for up-link communications in terrestrial gateways.