Telecommunications – Transmitter – With electrical protection of transmitter circuit or operator
Patent
1997-12-23
2000-10-17
Tsang, Fan
Telecommunications
Transmitter
With electrical protection of transmitter circuit or operator
455405, 455427, 455 134, 455522, 455 671, 455 261, 455 92, 340600, H04B 7185
Patent
active
061344230
ABSTRACT:
A method and system wherein a system gateway (18) determines, from closed loop power control information, a power density at an antenna (13a) of a user terminal 13. The gateway also maintains a record of a duration of time that the power density exceeds a specified threshold. The gateway determines if an averaged transmitted power density associated with the antenna of the user terminal will equal or exceed at least one of a predetermined threshold level, within a specified period of time, or an absolute threshold level. If the gateway determines that a threshold will probably be exceeded if the call connection is maintained, the gateway terminates the connection prior to a time that the user terminal averaged transmitted power density level equals or exceeds the predetermined or absolute threshold level. A tone or a visual indicator may be employed to warn the user that a current connection or call will be terminated. Provisions are made for allowing predetermined types of calls (e.g., emergency calls) to be made during a cutoff period wherein the user terminal is prohibited from placing further calls. It within the scope of the invention to perform the power density monitoring function also within the user terminal. In this case information may be transferred to the GW over a return link, and majority voting or some other technique can be employed by the GW before terminating the connection. In this case the power density determination made at the GW has priority over that made in the user terminal to prevent a user terminal from intentionally or inadvertently defeating the power density monitoring function.
REFERENCES:
patent: Re32905 (1989-04-01), Baran
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5010317 (1991-04-01), Schwendeman et al.
patent: 5073900 (1991-12-01), Mallinckrodt
patent: 5081703 (1992-01-01), Lee
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5119225 (1992-06-01), Grant et al.
patent: 5216427 (1993-06-01), Yan et al.
patent: 5233626 (1993-08-01), Ames
patent: 5239671 (1993-08-01), Linquist et al.
patent: 5243911 (1993-09-01), Dow et al.
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5303286 (1994-04-01), Wiedeman
patent: 5339330 (1994-08-01), Mallinckrodt
patent: 5388147 (1995-02-01), Grimes
patent: 5410728 (1995-04-01), Bertiger et al.
patent: 5415368 (1995-05-01), Horstein et al.
patent: 5422647 (1995-06-01), Hirshfield et al.
patent: 5428815 (1995-06-01), Grube
patent: 5433726 (1995-07-01), Horstein et al.
patent: 5439190 (1995-08-01), Horstein et al.
patent: 5446756 (1995-08-01), Mallinckrodt
patent: 5448623 (1995-09-01), Wiedeman et al.
patent: 5483673 (1996-01-01), Hiben et al.
patent: 5524275 (1996-06-01), Lindell
patent: 5526528 (1996-06-01), Kurisu
patent: 5802445 (1998-09-01), Wiedemann et al.
"Globalstar*: a Transparent System", D. Rouffet, Electrical Communication (1993) 1st Quarter, pp. 84-90.
"Current and Future Mobile Satellite Communication Systems" Kato et al., IEICE Transactions, Aug. 8, 1991, pp. 2201-2210, vol. E 74, No. 8, Aug. 1991.
"Iridium*:Key to Worldwide Cellular Communications", Jim Foley, Telecommunications, Oct., 1991, 4 pages.
Portion of Application of Loral Cellular Systems, Corp., before the Federal Communications Commission, Washington, D.C., Jun. 3, 1991, Globalstar, pp. 94-187.
Portion of Application of Ellipsat Corporation, before the Federal Communications Commission, Washington, D.C., pp. 5-34, Nov. 2, 1990.
"An Integrated Satellite-Cellular Land Mobile System for Europe", E. Del Re, University of Florence, Dept. of Electronics Engineering, italy, Sep. 21, 1989.
"Digital Network Oriented Mobile Satellite System as an Integrated Part of the GSM Cellular Radio System in Europe", P. Dondl, Deutsch BUndespost/Fernmeldetechniches Zentralmt/Darmstadt, Fed. Rep. Germ. Sep. 21,1989.
"The OmniTRACS Mobile Satellite Communications and Positioning System", E. Tiedemann, Jr. et al., Vehicle Electronics in the 90's: Proceedings of the In'l. Congress on Transporation Electronics, Oct. 1990.
"Software Implementation of a PN Spread Spectrum Receiver to Accommodate Dynamics", C. Cahn et al., IEEE Trans. on Comm., vol. COM-25, No. 8, Aug. 1977.
"A Communication Technique for Multipath Channels", R. Price, Proceedings of the IR, Mar. 1958, pp. 555-570.
Petition of American Mobile Satellite Corporation Before the FCC, Washington, DC 20554, dated Jun. 3, 1991, pp. 1-15.
Application of Motorola Satellite Communications, Inc. for IRIDIUM A Low Earth Orbit Mobile Satellite System before the FCC, Washington, D.C. Dec. 1990, pp. 49-96.
Before the FCC, Washington, D.C. 20554, Aries Constellation Low Earth Orbit Satellite System Proposal of Constellation Communications, Inc. Jun. 3, 1991, Appendix A, B, and C.
Application of TRW Inc. for Authority to Construct a New Communications Satellite System ODYSSEY.SM. before the FCC, Washington, D.C. 20554, May 31, 1991 pp. 33-51.
"Increased Capacity Using CDMA for Mobile Satellite Communication", K.Gilhousen et al., IEEE Journal on Selected Areas in Communications, vol. 8, No. 4, May 1990, pp. 503-514.
"The Iridium System--A Revolutionary Satellite Communications System Developed with Innovative Applications of Technology", D. Sterling et al., IEEE, MILCOM Nov. 4-7, 1991.
Monte Paul A.
Sites Michael J.
Wiedeman Robert A.
Globalstar L.P.
Sobutka Philip J.
Tsang Fan
LandOfFree
Satellite communications system having gateway-based user RF exp does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Satellite communications system having gateway-based user RF exp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Satellite communications system having gateway-based user RF exp will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-477747