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Terrestrial wi-fi networks can not attain each nook of the globe. Distant areas, maritime zones, and catastrophe areas usually lack cell tower protection. Non-terrestrial community integration with terrestrial wi-fi has moved quickly from idea to business actuality — satellite-based emergency messaging is already reside on client units, and 3GPP Launch 17 has laid the standardization basis for broader NTN integration. Direct-to-cell know-how addresses this hole by inserting LTE base stations on low earth orbit satellites. These satellites orbit between 340 km and 570 km altitude. They use phased array antennas to create slender, quasi-earth-fixed beams on the bottom. The satellite tv for pc compensates for Doppler shift and round-trip time on the community aspect. This implies present smartphones join with out {hardware} or software program modifications. The method depends on spectrum sharing between cellular and satellite tv for pc operators, or on re-farmed cellular satellite tv for pc service bands. Regulatory frameworks just like the FCC Supplemental Protection from Area doc are enabling these deployments. Preliminary companies embody textual content messaging, location sharing, and fundamental knowledge. DTC is taken into account an interim know-how earlier than 3GPP NR-NTN reaches full maturity. The long-term purpose is a unified 3D community structure combining terrestrial, satellite tv for pc, and airborne nodes beneath 6G.
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