Method and apparatus for message delivery in a communication system having orbiting transmitters
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United States of America Patent
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Jul 6, 1999
Issued Date -
N/A
app pub date -
Oct 29, 1997
filing date -
Sep 5, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
A communication system (10), having dynamic nodes such as satellites (12) communicate information from a calling party to a called party or subscriber unit (26). When adjacent interfering structures (100) obstruct a communication path, information is unable to pass therebetween. A message control center (27) allows a caller to leave a message for subsequent delivery to a subscriber unit (26). Message control center (27) calculates an enhanced delivery region (105) about a last-know location of subscriber unit (26) and determines satellite orbits that pass over the enhanced delivery region. This enhanced delivery region is serviced by satellites passing at near overhead elevation angles. Message control center (27) prioritizes the ground-tracks contained within an enhanced delivery region (105) and selects one for use in message delivery. A delivery time is calculated corresponding to the selected ground-track and message control center (27) schedules delivery of that message. Message control center (27) attempts to transmit a message as schedule to subscriber unit (26).
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