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 Title: |
US6115606:
User terminal access in satellite communication systems
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Munoz-Garcia, Samuel G.; London, United Kingdom
Chomet, Patrick; London, United Kingdom
Mullins, Dennis Roy; London, United Kingdom
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| Assignee: |
Inmarsat, Ltd., London, United Kingdom
other patents from INMARSAT, LTD. (772785) (approx. 10)
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| Published / Filed: |
2000-09-05
/ 1997-08-21
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| Application Number: |
US1997000915601
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| IPC Code: |
Advanced:
H04B 7/15;
H04B 7/185;
H04B 17/00;
Core:
more...
IPC-7:
H04B 7/185;
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| ECLA Code: |
H04B7/185M8;
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| U.S. Class: |
Current:
455/427;
455/012.1;
455/013.1;
Original:
455/427;
455/012.1;
455/013.1;
342/357;
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| Field of Search: |
455/427,428,12.1,13.1,35.1,54.1,54.2,53.1,56.1,69,70,434,421
342/357
370/310,318
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| Priority Number: |
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| 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.
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| Attorney, Agent or Firm: |
McDermott, Will & Emery ;
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| Primary / Asst. Examiners: |
Chin, Wellington; Tran, Pablo N.
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| Maintenance Status: |
E1 Expired Check current status
CC Certificate of Correction issued
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE DE FI FR GB NL SE
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| Family: |
Show 9 known family members
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First Claim:
Show all 11 claims |
We claim:
1. A communication system having a user terminal that can communicate with a plurality of satellites and each of said plurality of satellites can communicate with a plurality of earth stations; in which each of said plurality of satellites is operative, periodically, to provide messages, receivable by said user terminal, indicating with which of said plurality of earth stations said each satellite is in communications; in which said user terminal is configured to maintain a running log indicative of the number of instances it has received a message from a satellite indicating communications with a particular earth station.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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