Patents Assigned to AirTouch Communications
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Patent number: 6088522Abstract: A computer-implemented modeling tool for cellular telephone systems predicts signal strength under real conditions within a building, by considering the effects of inter-building and intra-building structures on transmitted signals. The modeling tool gives more accurate predictions under line of sight conditions, when obstructions occur due to inter-building and intra-building structures.Type: GrantFiled: July 31, 1997Date of Patent: July 11, 2000Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, Jau Young Lee
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Patent number: 6058301Abstract: A method of preventing roaming fraud in cellular telephone systems using different levels of roaming privileges for individual subscribers. When the subscriber initiates a call in a foreign service area that exceeds their roaming privileges, an authentication method is used to verify the identity of the roaming subscriber.Type: GrantFiled: November 27, 1996Date of Patent: May 2, 2000Assignee: AirTouch Communications, Inc.Inventor: David Leighton Daniels
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Patent number: 6032105Abstract: A computer-implemented modeling tool for cellular telephone systems predicts signal strength under real conditions by considering the effects of terrain and man-made structures on transmitted signals. The modeling tool gives more accurate predictions under line of sight conditions, when obstructions occur due to terrain contours, and when mobile or transmitter antennas are blocked by buildings or other structures.Type: GrantFiled: July 31, 1997Date of Patent: February 29, 2000Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, Jau Young Lee
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Patent number: 6023619Abstract: A method for reducing roaming fraud in mobile phone systems includes the exchange of an RF signature of a roaming mobile phone between the foreign and home service areas. Thereafter, the analysis of the RF signature can be performed either at the foreign or home service area.Type: GrantFiled: November 18, 1996Date of Patent: February 8, 2000Assignee: AirTouch Communications, Inc.Inventor: William J. Kaminsky
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Patent number: 5983118Abstract: A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having an assigned set of identification codes, are arranged with means for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including means for assigning at least one of the in the assigned set of identification codes to more than one mobile telephone. A unique identification code is assigned to a mobile telephone located in the cell. A signal having a unique identification code is generated for identifying the mobile telephone. The signal is coupled to the zones. A combiner is also provided for combining signals from all of the zones in the cell. A receiver is coupled to the combiner for retrieving the signals having the code.Type: GrantFiled: June 12, 1997Date of Patent: November 9, 1999Assignee: AirTouch Communications, Inc.Inventor: William Chien-Yeh Lee
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Patent number: 5978362Abstract: The invention describes method and apparatus for reducing intermodulation interference caused by reception of undesired signals in wireless receivers. The apparatus comprises an antenna for receiving the desired signal, a low noise amplifier for amplifying this signal, an adjustable attenuator, and a transmitting antenna to transmit the amplified signal to the wireless receiver. By increasing the strength of the desired signal, the present invention eliminates intermodulation distortion caused by the undesirable signals. The invention also describes an apparatus further comprising an adjustable filter for limiting the spectral content of the transmitted amplified signal, and an apparatus for selecting the characteristics of the adjustable filter in accordance with the measured characteristics of the desired and undesired signals.Type: GrantFiled: December 3, 1996Date of Patent: November 2, 1999Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, F. Craig Farrill
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Patent number: 5974328Abstract: A mobile radio telephone communication systems provides for rapid system access and registration of mobile phones when the mobile phone operates in an area outside of its home service area. A preferred mobile phone system for a mobile phone is identified before the mobile phone originates a call by determining a location for the mobile phone and selecting the preferred system from a database stored in the mobile phone using the determined location.Type: GrantFiled: September 17, 1997Date of Patent: October 26, 1999Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, F. Craig Farrill
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Patent number: 5950121Abstract: A method and apparatus for fraud control in cellular telephone systems. The invention identifies relative fraud probabilities for call records from the cellular telephone system, associates the call records with radio frequency (RF) signatures, and identifies the radio frequency signatures as being fraudulent or valid based on the relative fraud probabilities for the associated call records.Type: GrantFiled: June 10, 1996Date of Patent: September 7, 1999Assignee: AirTouch Communications, Inc.Inventors: William J. Kaminsky, Jeffrey G. Sanpore, David L. Daniels, Mary H. Kennedy
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Patent number: 5812522Abstract: An integrated radio frequency communication system, known as a Location-Ruled Radio-Integrated Network (LORRAINE) system, provides integrated voice, data and location services. The radio frequency communications system combines time division multiplexing (TDM) techniques with optional time division duplexing (TDD) or frequency division duplexing (FDD) techniques to provide a plurality of time slot channels for these services. Spread spectrum techniques help reduce noise and interference in the system.Type: GrantFiled: March 31, 1995Date of Patent: September 22, 1998Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, F. Craig Farrill
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Patent number: 5758287Abstract: The present invention discloses a hub and remote cellular system having RF generating equipment located at a centralized hub, and RF front end equipment located at each of a plurality of remote omni-directional cell sites. The centralized hub distributes channels for the remote cell sites. The hub and remote structure provides for the efficient allocation of resources to a plurality of cell sites, lowers equipment costs, real estate costs, regulatory costs, and maintenance costs.Type: GrantFiled: August 29, 1996Date of Patent: May 26, 1998Assignee: AirTouch Communications, Inc.Inventors: William Chien-Yeh Lee, David Anthony Pasquel, Ronald S. Rudokas
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Patent number: 5678186Abstract: A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having an assigned set of identification codes, are arranged with means for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including means for assigning at least one of the in the assigned set of identification codes to more than one mobile telephone. A unique identification code is assigned to a mobile telephone located in the cell. A signal having a unique identification code is generated for identifying the mobile telephone. The signal is coupled to the zones. A combiner is also provided for combining signals from all of the zones in the cell. A receiver is coupled to the combiner for retrieving the signals having the code.Type: GrantFiled: February 28, 1996Date of Patent: October 14, 1997Assignee: AirTouch Communications, Inc.Inventor: William C. Y. Lee
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Patent number: 5555551Abstract: A method and apparatus for fraud control in cellular telephone systems. Call records from a switch are scanned to identify a fraudulent cellular phone based on its behavior. An identifier, e.g., a radio frequency (RF) signature, representative of the fraudulent phone is stored in a control channel editor at a cell site. A database of identifiers may comprise a positive validation database storing the identifiers for all valid phones used in the cellular telephone system, or it may be a negative validation database storing the identifiers for known fraudulent phones. A control channel editor intercepts a call origination request transmitted by a phone, and a control processor compares one or more characteristics of the phone transmitting the call origination request to the database of identifiers. The control processor then prevents the call origination request from completing when the comparison indicates that the phone is fraudulent.Type: GrantFiled: February 16, 1995Date of Patent: September 10, 1996Assignee: AirTouch Communications, Inc.Inventors: Ronald S. Rudokas, John A. Storch, David L. Daniels
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Patent number: 5507020Abstract: A communications system is disclosed for spectrum sharing of a microwave point-to-point system and a PCS system. The invention comprises a microwave communications system. This system includes a transmitter for transmitting a first signal and a second signal. The first signal and the second signal are oppositely circularly polarized electromagnetic waves within a predefined frequency range. The system also includes a receiver for receiving the first and second signals. In the preferred embodiment of the present invention the receiver may further include a first microwave receiver for receiving the first signal. It would then include a second receiver for receiving the second signal. The receiver would also include signal combining circuitry for combining the first signal and the second signal to generate a composite signal. It would then include a signal comparator to generate a comparison signal by comparing the average value of the amplitude of the composite signal with a predetermined value.Type: GrantFiled: October 19, 1994Date of Patent: April 9, 1996Assignee: AirTouch Communications of CaliforniaInventor: William C. Y. Lee
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Patent number: 5504936Abstract: A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having an assigned set of identification codes, are arranged with means for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including means for assigning at least one of the in the assigned set of identification codes to more than one mobile telephone. A unique identification code is assigned to a mobile telephone located in the cell. A signal having a unique identification code is generated for identifying the mobile telephone. The signal is coupled to the zones. A combiner is also provided for combining signals from all of the zones in the cell. A receiver is coupled to the combiner for retrieving the signals having the code.Type: GrantFiled: June 21, 1994Date of Patent: April 2, 1996Assignee: AirTouch Communications of CaliforniaInventor: William C. Lee
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Patent number: 5479397Abstract: A cellular telephone system is described of the type wherein a plurality of contiguous cells, each having an assigned set of identification codes, are arranged with means for maintaining continuous communication with mobile telephones moving from cell to cell. The system allows multiple access by including means for assigning at least one of the in the assigned set of identification codes to more than one mobile telephone. A unique identification code is assigned to a mobile telephone located in the cell. A signal having a unique identification code is generated for identifying the mobile telephone. The signal is coupled to the zones. A combiner is also provided for combining signals from all of the zones in the cell. A receiver is coupled to the combiner for retrieving the signals having the code.Type: GrantFiled: October 27, 1994Date of Patent: December 26, 1995Assignee: AirTouch Communications of CaliforniaInventor: William C. Y. Lee
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Patent number: 5420910Abstract: A method and apparatus for fraud control in cellular telephone systems. Call records from a switch are scanned to identify a fraudulent cellular phone based on its behavior. An identifier, e.g., a radio frequency (RF) signature, representative of the fraudulent phone is stored in a control channel editor at a cell site. A database of identifiers may comprise a positive validation database storing the identifiers for all valid phones used in the cellular telephone system, or it may be a negative validation database storing the identifiers for known fraudulent phones. A control channel editor intercepts a call origination request transmitted by a phone, and a control processor compares one or more characteristics of the phone transmitting the call origination request to the database of identifiers. The control processor then prevents the call origination request from completing when the comparison indicates that the phone is fraudulent.Type: GrantFiled: June 29, 1993Date of Patent: May 30, 1995Assignee: AirTouch CommunicationsInventors: Ronald S. Rudokas, John A. Storch, David L. Daniels
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Patent number: 5349631Abstract: An Inbuilding Communications System for providing telephone communication to a first set of portable telephones located in a first area and to a second set of portable telephones located in a second area; the first set of portable telephones transmit and receive a first set of radio signals having a set of assigned frequencies; the second set of portable telephones transmit and receive a second set of signals having the same set of assigned frequencies; the first and second areas are separated by a structure which attenuates radio signals. A first set of at least two antennas is located inside the first area for communicating with the first set of portable telephones. The number of antennas and the position of each antenna in the first set of antennas are chosen such that the first set of radio signals is attenuated below a pre-determined level after passing through the structure.Type: GrantFiled: November 21, 1991Date of Patent: September 20, 1994Assignee: AirTouch CommunicationsInventor: William C. Lee