Mobile Satellite Services - MSS
"Mobile-satellite service (short: MSS ;also: mobile-satellite radiocommunication service) is – according to Article 1.25 of the International Telecommunication Union´s (ITU) Radio Regulations (RR) – defined as «A radiocommunication service
* between mobile earth stations and one or more space stations, or between space stations used by this service; or
* between mobile earth stations by means of one or more space stations."
See Wikipedia: https://en.wikipedia.org/wiki/Mobile-satellite_service