유해한 간섭 없이 3GPP Band n255(L-band), Band n256(S-band) 및 재할당된 지상 중대역에서 다이렉트 투 핸드셋 서비스를 구현하기 위한 전파 엔지니어링 규격.
Satellite communications channels diverge drastically from terrestrial cellular topologies. Friis transmission equations over 600km to 36,000km propagation distances introduce severe free-space path loss (FSPL). In addition, ionospheric scintillation in L-band and tropospheric rain fade in Ka/Q-band mandate dynamic link budget adaptations. This section establishes the quantitative framework governing direct-to-device spectrum coexistence.
Operating communication hardware in the space environment introduces rigid SWaP-C (Size, Weight, Power, and Cost) boundaries. Flight computers must withstand Total Ionizing Dose (TID) radiation and Single-Event Upsets (SEU). Silicon accelerators implementing direct-to-device spectrum coexistence leverage triple-modular redundancy (TMR) and specialized Gallium Nitride (GaN) power stages to achieve high power-added efficiency (PAE).
As telecommunications advance toward 3GPP Release 19 and 6G specifications, direct-to-device spectrum coexistence will evolve into a fully native space-ground mesh. Through AI-driven radio resource management (RRM) and terahertz optical interconnects, non-terrestrial networks will deliver ubiquitous multi-gigabit connectivity to every point on the globe.