  Recently advanced low-Earth-orbit (LEO) satellite networks represented by
large constellations and advanced payloads provide great promises for enabling
high-quality Internet connectivity to any place on Earth. However, the
traditional access-based approach to satellite operations cannot meet the
pressing requirements of real-time, reliable, and resilient operations for LEO
satellites. A new scheme is proposed based on multi-layer satellite networking
considering the advanced Ka-band and optical communications payloads on a
satellite platform. The proposed scheme can enable efficient and resilient
message transmissions for critical telecommand and telemetry missions through
different layers of satellite networks, which consist of LEO,
medium-Earth-orbit (MEO), and geostationary (GEO) satellites. The proposed
scheme is evaluated in a 24-hr satellite mission and shows superior performance
improvements compared to the traditional operations approach.
