在 3GPP n255 频段 (L波段)、n256 频段 (S波段) 以及重构地面中频段部署手机直连卫星业务的无线电工程规范与跨系统同频干扰协调机制。
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.