PRECOORDINATION OF RETURN LINK FOR HAND-OFF BETWEEN COVERAGEAREAS BEING TRAVERSED BY A MOBILE TRANSCEIVER PLATFORM

摘要

A system and method for carrying out a hand-off of a satellite-based communications link with a mobile platform, such as an aircraft, leaving a first coverage region and entering a second coverage region. A land-based communications link connects ground stations in each of the coverage regions for communications with one another and also with a network operations cente r (NOC). As the aircraft enters an area of overlap between the two coverage regions, a sequence of communications is initiated between the ground statio ns and also between each of the ground stations and the aircraft to ensure that new forward link and return link assignments are received by the aircraft before the aircraft relinquishes its communications link with the first grou nd station to begin communicating with the second ground station. The hand-off in communications is accomplished in less than approximately 30 seconds of time after one of the ground stations detects that the aircraft has entered a pre - defined overlap area between the two coverage regions.