| 摘要 |
PURPOSE: A gateway communication system distributed to low altitude global orbit is provided to obtain a satellite communication system with which one user terminal can call the other user terminal within a range of an area in which service is offered by at least one satellite and to minimize communication systems to be concerned in a call. CONSTITUTION: A method for operating a communication system, comprising steps of providing a satellite communication system segment comprised of at least one satellite that projects a plurality of beams on the surface of the earth and at least one satellite system ground station that is bidirectionally coupled to the at least one satellite, providing a terrestrial communication segment comprised of a plurality of satellite user terminals located within a service region of said ground station; initiating a call from a first user terminal to a second user terminal, wherein a call initiation request is relayed to the ground station through at least one satellite, setting up the call using the ground station, and assigning satellite system resources to one of the user terminals that is designated a call manager for the call.
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