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 Title: |
US6118999:
Earth station and user terminal access control system for satellite communication systems
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Moraes, Jose Luiz Albuquerque; Middlesex, United Kingdom
Lu, Sze-Ching; Surrey, United Kingdom
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| Assignee: |
ICO Services Ltd., London, United Kingdom
other patents from ICO SERVICES LTD. (762886) (approx. 19)
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| Published / Filed: |
2000-09-12
/ 1997-08-22
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| Application Number: |
US1997000916410
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| IPC Code: |
Advanced:
H04B 7/15;
H04B 7/185;
H04Q 7/22;
H04Q 7/24;
H04Q 7/26;
H04Q 7/30;
H04Q 7/38;
Core:
more...
IPC-7:
H04Q 7/20;
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| ECLA Code: |
H04B7/185M6;
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| U.S. Class: |
Current:
455/430;
455/013.1;
455/427;
455/428;
Original:
455/430;
455/427;
455/013.1;
455/456;
455/428;
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| Field of Search: |
455/427,430,12.1,13.1,525,456,433,426,428
370/310,316
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| Priority Number: |
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| Abstract: |
In a satellite communication system, a user terminal (11) seeks response from a selected earth station (7A-E) for a request for service based analysing the signal quality of broadcasts from earth stations (7A-E). Whichever earth station (7A-E) responds calculates which earth station (7A-E) can best meet the request for service. If it is another earth station (7A-E), the user terminal (11) is intructed to redirect the request for service thereto and, once in contact, the user terminal (11) addresses all new requests directly thereto, until the best earth station (7A-E) calculates that there is a better earth station (7A-E), and instructs the user terminal (11) to address all future requests for service thereto. This continues ad infinitum, unless the best earth station (7A-E) is inaccessible for the request for service, in which case the user terminal (11) once again reverts to selecting an earth station (7A-E) based on signal quality analysis, any failed requests for service being intimated and ignored by the addressed earth station (7A-E) in any future calculation of the best earth station (7A-E).
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| Attorney, Agent or Firm: |
McDermott, Will & Emery ;
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| Primary / Asst. Examiners: |
Hunter, Daniel S.; Woldetatios, Yemane
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| INPADOC Legal Status: |
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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 NL SE
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| Family: |
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First Claim:
Show all 50 claims |
What is claimed is:
1. A satellite communication system comprising:
- a plurality of satellites,
- a plurality of earth stations, and
- a user terminal configured to select one out of the plurality of earth stations and to transmit a request for service addressed to the one out of the plurality of earth stations selected by the user terminal,
- wherein the addressed earth station comprises a receiver to receive, via a satellite, the request for service, a processor to perform a calculation to elect which one out of the plurality of earth stations is best able to meet the request for service and a transmitter to transmit an instruction, to the user terminal, to request service from the elected earth station in the event that the calculation indicates that the elected earth station is not the addressed earth station.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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