US Patent No: 5,835,857

Number of patents in Portfolio can not be more than 2000

Position determination for reducing unauthorized use of a communication system

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Abstract

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Methods for operating a wireless communications system provided for reducing the use of the system by unauthorized users by establishing the geographical location of selected user, comparing this location with the known locations of authorized users and denying service to the selected user if the selected user's location does not correspond to the known location of authorized users. Seamless hand-over of a user between nodes of the communication system is effected by periodically recomputing a algorithm which determines a preferred node for communication with the user. When the algorithm indicates that another node is preferred, a call initiation handshake is established between the user and the preferred node, while still maintaining communication with the original node. Communication between the user and the first node is not interrupted until the user establishes a communication 'lock' with the second node. Passive intermodulation interference of signals transmitted and received by nodes of a multi-satellite node system is eliminated by using certain of the satellite nodes for transmit-only and other of the satellite nodes for receive-only operation. In another embodiment PIM interference is eliminated by time duplexing the signals transmitted and received by a satellite's antenna. PIM interference is also reduced by assigning unique portions of each transmitter subband and each receiver subband to each of the satellite nodes.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ATC TECHNOLOGIES, LLCRESTON, VA217

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Otten, David D Redondo Beach, CA 7 725

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ATC TECHNOLOGIES, LLC (1)
5,612,703 position determination in an integrated cellular communications system 213 1995
 
INTERDIGITAL TECHNOLOGY CORPORATION (1)
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5,499,032 Navigation and positioning system and method using uncoordinated beacon signals 37 1993
 
TRIMBLE NAVIGATION LIMITED (1)
5,319,374 Precise universal time for vehicles 136 1993

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ATC TECHNOLOGIES, LLC (126)
6,522,865 Hybrid satellite communications system 152 1999
6,892,068 Coordinated satellite-terrestrial frequency reuse 180 2001
6,859,652 Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis 167 2001
7,039,400 Systems and methods for monitoring terrestrially reused satellite frequencies to reduce potential interference 70 2002
6,999,720 Spatial guardbands for terrestrial reuse of satellite frequencies 139 2002
7,181,161 Multi-band/multi-mode satellite radiotelephone communications systems and methods 59 2002
7,062,267 Methods and systems for modifying satellite antenna cell patterns in response to terrestrial reuse of satellite frequencies 76 2002
7,031,702 Additional systems and methods for monitoring terrestrially reused satellite frequencies to reduce potential interference 85 2002
7,006,789 Space-based network architectures for satellite radiotelephone systems 125 2002
7,174,127 Data communications systems and methods using different wireless links for inbound and outbound data 57 2002
7,092,708 Systems and methods for increasing capacity and/or quality of service of terrestrial cellular and satellite systems using terrestrial reception of satellite band frequencies 63 2002
6,937,857 Systems and methods for reducing satellite feeder link bandwidth/carriers in cellular satellite systems 134 2002
7,218,931 Satellite radiotelephone systems providing staggered sectorization for terrestrial reuse of satellite frequencies and related methods and radiotelephone systems 63 2003
7,593,724 Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode 29 2003
7,155,340 Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates 61 2004
7,444,170 Co-channel wireless communication methods and systems using nonsymmetrical alphabets 46 2004
7,203,490 Satellite assisted push-to-send radioterminal systems and methods 60 2004
7,113,778 Aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods 65 2004
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7,418,263 Systems and methods for handover between space based and terrestrial radioterminal communications 45 2005
7,453,396 Radioterminals and associated operating methods that alternate transmission of wireless communications and processing of global positioning system signals 44 2005
8,265,549 Satellite communications systems and methods using radiotelephone 0 2005
7,447,501 Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference 42 2005
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7,603,117 Systems and methods for terrestrial use of cellular satellite frequency spectrum 27 2005
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7,957,694 Satellite-band spectrum utilization for reduced or minimum interference 2 2005
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7,599,656 Spatial guardbands for terrestrial reuse of satellite frequencies 26 2005
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8,594,704 Location-based broadcast messaging for radioterminal users 0 2005
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7,636,567 Coordinated satellite-terrestrial frequency reuse 26 2006
7,756,490 Methods, radioterminals, and ancillary terrestrial components for communicating using spectrum allocated to another satellite operator 18 2006
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7,620,394 Reusing frequencies of a fixed and/or mobile communications system 25 2006
7,796,986 Modification of transmission values to compensate for interference in a satellite down-link communications 17 2006
7,627,285 Satellite communications systems and methods with distributed and/or centralized architecture including ground-based beam forming 29 2006
7,634,229 Intra-system and/or inter-system reuse of feeder link frequencies including interference suppression systems and methods 24 2006
7,609,666 Methods and systems providing adaptive feeder links for ground based beam forming and related systems and satellites 33 2006
7,890,098 Staggered sectorization for terrestrial reuse of satellite frequencies 0 2006
RE42261 Wireless communications systems and methods using satellite-linked remote terminal interface subsystems 7 2006
7,593,726 Coordinated satellite-terrestrial frequency reuse 29 2006
7,970,345 Systems and methods of waveform and/or information splitting for wireless transmission of information to one or more radioterminals over a plurality of transmission paths and/or system elements 9 2006
7,907,944 Methods, apparatus and computer program products for joint decoding of access probes in a CDMA communications system 0 2006
7,925,209 Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint 2 2006
8,190,114 Frequency-dependent filtering for wireless communications transmitters 0 2006
7,623,867 Satellite communications apparatus and methods using asymmetrical forward and return link frequency reuse 23 2006
7,831,202 Satellite communications systems and methods using substantially co-located feeder link antennas 13 2006
7,907,893 Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis 15 2006
7,623,859 Additional aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods 33 2006
7,421,342 Network-assisted global positioning systems, methods and terminals including doppler shift and code phase estimates 50 2006
8,170,474 Satellite assisted radioterminal communications systems and methods 4 2006
7,979,024 Systems and methods for satellite forward link transmit diversity using orthagonal space coding 8 2007
8,705,436 Adaptive spotbeam broadcasting, systems, methods and devices for high bandwidth content distribution over satellite 0 2007
7,751,823 Systems and methods for controlling a level of interference to a wireless receiver responsive to an activity factor associated with a wireless transmitter 17 2007
7,593,691 Systems and methods for controlling a level of interference to a wireless receiver responsive to a power level associated with a wireless transmitter 31 2007
7,792,069 Systems and methods for terrestrial reuse of cellular satellite frequency spectrum using different channel separation technologies in forward and reverse links 16 2007
8,526,941 Apparatus and methods for mobility management in hybrid terrestrial-satellite mobile communications systems 0 2007
7,801,520 Methods and systems for configuring satellite antenna cell patterns in response to terrestrial use of satellite frequencies 16 2007
7,831,201 Co-channel wireless communication methods and systems using relayed wireless communications 15 2008
8,064,378 Location-based broadcast messaging for radioterminal users 0 2008
8,031,646 Systems, methods and devices for reusing spectrum of another operator 5 2008
8,064,824 Systems and methods for reducing power robbing impact of interference to a satellite 1 2008
7,593,725 Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference 28 2008
7,856,211 Broadband wireless communications systems and methods using multiple non-contiguous frequency bands/segments 14 2008
7,696,924 Radioterminals and associated operating methods that transmit position information responsive to change/rate of change of position 21 2008
8,270,898 Satellite-band spectrum utilization for reduced or minimum interference 1 2008
8,050,674 Radioterminals including satellite/hands-free interlocks and related methods 5 2008
7,783,287 Satellite radiotelephone systems, methods, components and devices including gated radiotelephone transmissions to ancillary terrestrial components 16 2008
8,238,818 Satellite communications systems and methods using radiotelephone location-based beamforming 0 2008
7,792,488 Systems and methods for transmitting electromagnetic energy over a wireless channel having sufficiently weak measured signal strength 23 2009
7,978,135 Antenna beam forming systems/methods using unconstrained phase response 3 2009
8,265,637 Systems and methods for modifying antenna radiation patterns of peripheral base stations of a terrestrial network to allow reduced interference 1 2009
7,974,575 Methods of reducing interference including applying weights to provide correction signals and related systems 3 2009
7,970,346 Methods of reducing interference including calculation of weights based on errors and related systems 4 2009
7,890,050 Methods of reducing interference including determination of feeder link signal error and related systems 6 2009
8,045,975 Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint 5 2009
7,796,985 Systems and methods for packing/unpacking satellite service links to/from satellite feeder links 16 2009
8,433,241 Systems, methods and devices for overlaid operations of satellite and terrestrial wireless communications systems 0 2009
8,023,954 Systems and methods for controlling a cellular communications system responsive to a power level associated with a wireless transmitter 5 2009
7,890,097 Systems and methods for monitoring selected terrestrially used satellite frequency signals to reduce potential interference 4 2009
8,285,278 Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode 0 2009
7,899,002 Satellite/terrestrial wireless communications systems and methods using disparate channel separation codes 0 2009
8,369,775 Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis 0 2009
8,068,828 Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex mode 0 2009
8,023,939 Reusing frequencies of a fixed and/or mobile communications system 1 2009
8,073,394 Prediction of uplink interference potential generated by an ancillary terrestrial network and/or radioterminals 0 2009
7,953,373 Prediction of uplink interference potential generated by an ancillary terrestrial network and/or radioterminals 3 2009
7,917,135 Satellite communications apparatus and methods using asymmetrical forward and return link frequency reuse 8 2009
8,369,776 Apparatus and methods for power control in satellite communications systems with satellite-linked terrestrial stations 1 2009
8,078,101 Systems and methods for terrestrial reuse of cellular satellite frequency spectrum in a time-division duplex and/or frequency-division duplex mode 3 2009
8,055,257 Systems and methods with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network 5 2009
8,274,925 Retaining traffic channel assignments for satellite terminals to provide lower latency communication services 0 2010
8,520,561 Systems, methods and network components that provide different satellite spot beam return carrier groupings and reuse patterns 0 2010
7,999,735 Radioterminals and associated operating methods that transmit position information responsive to rate of change of position 0 2010
8,249,585 Systems, methods and computer program products for mobility management in hybrid satellite/terrestrial wireless communications systems 0 2010
8,108,004 Co-channel wireless communication methods and systems using relayed wireless communications 2 2010
8,339,308 Antenna beam forming systems, methods and devices using phase adjusted least squares beam forming 0 2010
8,412,126 Communications systems including adaptive antenna systems and methods for inter-system and intra-system interference reduction 1 2010
8,576,769 Systems and methods for adaptive interference cancellation beamforming 0 2010
8,014,815 Radioterminals including satellite interlocks and related methods 0 2010
8,285,225 Broadband wireless communications systems and methods using multiple non-contiguous frequency bands/segments 0 2010
7,974,619 Systems and methods for mobility management in overlaid mobile communications systems 3 2010
8,655,398 Communications systems and methods including emission detection 0 2011
8,340,592 Radioterminals and operating methods that receive multiple measures of information from multiple sources 0 2011
8,131,293 Systems and methods for mobility management in overlaid mobile communications systems 1 2011
8,145,126 Satellite-band spectrum utilization for reduced or minimum interference 0 2011
8,238,819 Systems and methods for inter-system sharing of satellite communications frequencies within a common footprint 1 2011
 
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Other [Check patent profile for assignment information] (2)
RE45107 Filters for combined radiotelephone/GPS terminals 0 2010
8,824,536 Systems, methods, and devices for electronic spectrum management 0 2013