User terminal access in satellite communication systems

Details User terminal access in satellite communication systems User terminal access in satellite communication systems

1997-08-21

2000-09-05

Chin, Wellington

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

455 121, 455 131, 342357, H04B 7185

Patent

active

06115606&

ABSTRACT:
A satellite communications system comprises satellites 9A-C, earth stations 7A-E, user terminals 11 and controlling gateways 3 in the form of mobile satellite switching centers 5A-E. Access with a user terminal 11 may be gained to a terrestrial telephone system 1 by earth stations 7A-E contacting the satellites 9A-C and by the satellites contacting the user terminals 11. The satellites 9A-C periodically broadcast messages indicative of the earth station 7A-E with which they are instantly in contact. The user terminal 11 listens to and logs these broadcasts to keep a list of the relative number of times each earth station 7A-E can be heard. When calling into the system, the user terminal pages earth stations in descending order of number of entries in the log. When in contact, the user terminal 11 sends the log to the system. When subsequently trying to contact the user terminal 11, the system uses earth stations in descending order of number of entries on the log, last received from the user terminal.

REFERENCES:
patent: 5448623 (1995-09-01), Wiedeman et al.
patent: 5604920 (1997-02-01), Bertiger et al.
patent: 5752162 (1998-05-01), Sawyer et al.
patent: 5812932 (1998-09-01), Wiedeman et al.

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