Spacecraft cellular communication system with spot beam pairing

Details Spacecraft cellular communication system with spot beam pairing Spacecraft cellular communication system with spot beam pairing

1998-08-12

2000-09-12

Le, Thanh Cong

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455426, 455430, 455 121, H04B 7185, H04B 718, H09Q 720

Patent

active

061189987

ABSTRACT:
A communication system includes a spacecraft which produces a plurality of overlapping spot beams. The spacecraft moves periodically in the N-S direction. Terrestrial user terminals may lie in one spot beam when the spacecraft is in one position, and in another spot beam at a later time. The system also maintains a log of the spot beam location of the user terminals, so all the spot beams do not have to be polled to find the desired one. In order to avoid system loading by location updates resulting from spacecraft motion, the spot beam location of each user terminal is stored in paired form. When a particular user terminal is to be contacted, transmission is performed over both spot beams of the pair. Update occurs only if the user terminal is not in either spot beam of the pair.

REFERENCES:
patent: 5161248 (1992-11-01), Bertiger et al.
patent: 5641134 (1997-06-01), Vatt
patent: 5937352 (1999-08-01), Courtney et al.
patent: 6019318 (2000-02-01), Cellier et al.

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