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Mobile satellite service
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Mobile satellite service
Mobile-satellite service (MSS, or mobile-satellite radiocommunication service) is – according to Article 1.25 of the International Telecommunication Union's Radio Regulations – "A radiocommunication service
This service may also include feeder links necessary for its operation."
Most commercial voice and some data mobile satellite services are provided by systems operating in the L-band by Iridium, Inmarsat, Globalstar and Thuraya. The L-band spectrum allocated for MSS is between 1.5 and 2.5 GHz, with the upper portion often referred to as the S-band.
Constellations of low earth orbiting (LEO) satellites are used by Iridium (66 satellites) and Globalstar (48 satellites). Inmarsat and Thuraya currently use 4 (i4) and 2 geostationary satellites respectively, their L-band services are similar but not interoperable and most terminals can only use one or the other service, although some data terminals provide a mechanical switch required due to the different polarization schemes used by both systems.
Another MSS service is MSV / MSAT / LightSquared / Ligado with 2 geostationary satellites serving North America.
China has shown an upcoming S-band satellite phone which will use its recently launched Tiantong-1 geostationary satellite.
Additionally to the four active Inmarsat 4 ('I4') satellites, Inmarsat also maintains some legacy L-band services on its previous generation satellites, although they are being gradually phased out and users are invited to upgrade to i4-based services, mostly based on variations of BGAN.
Inmarsat also owns and operates a new fleet of three Ka-band satellites, known as the Inmarsat 5 constellation (usually abbreviated to 'I5'), providing high speed mobile satellite data services known as Global Express.
Other MSS systems currently inoperative were Ico / Pendrell, TerreStar and Ellipso.
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Mobile satellite service
Mobile-satellite service (MSS, or mobile-satellite radiocommunication service) is – according to Article 1.25 of the International Telecommunication Union's Radio Regulations – "A radiocommunication service
This service may also include feeder links necessary for its operation."
Most commercial voice and some data mobile satellite services are provided by systems operating in the L-band by Iridium, Inmarsat, Globalstar and Thuraya. The L-band spectrum allocated for MSS is between 1.5 and 2.5 GHz, with the upper portion often referred to as the S-band.
Constellations of low earth orbiting (LEO) satellites are used by Iridium (66 satellites) and Globalstar (48 satellites). Inmarsat and Thuraya currently use 4 (i4) and 2 geostationary satellites respectively, their L-band services are similar but not interoperable and most terminals can only use one or the other service, although some data terminals provide a mechanical switch required due to the different polarization schemes used by both systems.
Another MSS service is MSV / MSAT / LightSquared / Ligado with 2 geostationary satellites serving North America.
China has shown an upcoming S-band satellite phone which will use its recently launched Tiantong-1 geostationary satellite.
Additionally to the four active Inmarsat 4 ('I4') satellites, Inmarsat also maintains some legacy L-band services on its previous generation satellites, although they are being gradually phased out and users are invited to upgrade to i4-based services, mostly based on variations of BGAN.
Inmarsat also owns and operates a new fleet of three Ka-band satellites, known as the Inmarsat 5 constellation (usually abbreviated to 'I5'), providing high speed mobile satellite data services known as Global Express.
Other MSS systems currently inoperative were Ico / Pendrell, TerreStar and Ellipso.
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