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 Title: |
US6201967:
Communications apparatus and method
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Goerke, Thomas; Middlesex, 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: |
2001-03-13
/ 1997-09-09
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| Application Number: |
US1997000926072
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| IPC Code: |
Advanced:
H04B 7/185;
H04B 17/00;
H04Q 7/34;
IPC-7:
H04Q 7/20;
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| ECLA Code: |
H04B7/185M8; T04Q213/13098; T04Q213/13109; T04Q213/13176; T04Q213/13213; T04Q213/13333;
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| U.S. Class: |
Current:
455/435.1;
455/012.1;
455/428;
Original:
455/435;
455/012.1;
455/428;
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| Field of Search: |
455/12.1,13.1,427-428,430,435,443,448
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| Priority Number: |
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| Abstract: |
A mobile satellite communications system having at least one mobile terminal (2), at least one ground station (6), at least one relay satellite (4) interconnecting said user terminal (2) and said ground station (6), and a management store (48) associated with said ground station (6), in which the user terminal (2) is configured to initiate registration signalling with said store (48). The user terminal (2) initiates registration signalling when reception conditions relating to a downlink channel relayed via said satellite (4) become unsatisfactory over a given time greater than a predetermined minimum value and then return to a satisfactory condition. Specifically, signals received in a given channel are monitored in relation to predetermined criteria, and the duration of periods when the monitored signals do not meet the criteria are timed. Signals for updating the location of the user terminal registered in the management store, are transmitted when said monitored signals in said channel again meet said criteria, only if the timed duration for which the monitored signals do not meet the criteria, is not less than a predetermined time (T2).
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| Attorney, Agent or Firm: |
McDermott, Will & Emery ;
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| Primary / Asst. Examiners: |
Trost, William G.;
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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 7 known family members
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First Claim:
Show all 27 claims |
What is claimed is:
1. A method of operating a user terminal to provide location updates while the user terminal is registered with a communications network providing a communications service, the user terminal being operable to register data concerning its location in a remote management store, the method including:
- monitoring signals received in a given channel transmitted from the communications network in relation to predetermined criteria,
- timing the duration of periods when the monitored signals do not meet the criteria, and
- when said monitored signals again meet said criteria and if said timed duration exceeds a predetermined duration, transmitting a location update signal from the user terminal to update the location of the user terminal registered in the management store.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 120 U.S. patent(s) that reference this one
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| Foreign References: |
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| Other References: |
"The Iridium (TM) System personal Communications Anytime, Anyplace", J.E. Hatlelid et al., Proceedings of the Third International Mobile Satellite Conference IMC 93, Jun. 16-18, 1993, pp. 285-290.
"The Globalstar Mobile Satellite System for Worldwide Personal Communications", R.A. Weideman et al., pp. 291-296, Proceedings of the Third International Mobile Satellite Conference IMC 93, Jun. 16-18, 1993, pp. 285-290.
"Security Aspects and the Implementation in the GSM-System", Peter C.J. van der Arend, pp. 4a, Digital Cellular Radio Conference (DCRC) Conference Proceedings, Oct. 12-14, 1988, published by Deutche Bundespost, France Telecom and Fernuniversitate.
"Study on Networking Issues of Medium Earth Orbit Satellite Communications Systems", Araki et al., Proceedings of the Third International Mobile Satellite Conference IMSC 1993 (JPL publication 93-009), pp. 529-534, published by Jet Propulsion Laboratories (1993).
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