Patents by Inventor David N. Freeman

David N. Freeman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Synchronization between uncoordinated time division duplex communication networks
    Patent number: 7822074
    Abstract: An apparatus and method for synchronization between uncoordinated Time Division Duplex (TDD) communication networks includes a first step (300) of measuring an interference level on channels available to a base station. A next step (302) includes choosing the channel having the lowest interference level. A next step (304) includes determining that the interference is from a base station. A next step (306) includes calculating an interference profile over the frame cycle. A next step (308) includes establishing a peak interference level. A next step (310) includes aligning the base station frame timing in response to the peak interference level.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: October 26, 2010
    Assignee: Motorola Mobility, Inc.
    Inventors: Richard C. Lucas, David N. Freeman, Jonathan A. Gibbs
  • Mobile Station and Method Therefor Using Doppler and Cell Transition History for Cell Evaluation in a Fast Moving Environment
    Publication number: 20090303891
    Abstract: There is disclosed, a mobile station, and a method for candidate cell evaluation in a fast moving environment. The method includes receiving a plurality of transmissions from a plurality of candidate cells, where each of the plurality of transmissions corresponds to one of the plurality candidate cells. The method further includes measuring signal strengths of the plurality of transmissions and determining change in the signal strengths of the plurality of transmissions. The method further includes calculating a weighting factor corresponding to the plurality of candidate cells based on the measured signal strengths, the change in the signal strength, and a Doppler and assigning priority levels to the plurality of candidate cells based on the calculated weighting factor.
    Type: Application
    Filed: June 6, 2008
    Publication date: December 10, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Richard C. Lucas, David N. Freeman
  • SYNCHRONIZATION BETWEEN UNCOORDINATED TIME DIVISION DUPLEX COMMUNICATION NETWORKS
    Publication number: 20090279457
    Abstract: An apparatus and method for synchronization between uncoordinated Time Division Duplex (TDD) communication networks includes a first step (300) of measuring an interference level on channels available to a base station. A next step (302) includes choosing the channel having the lowest interference level. A next step (304) includes determining that the interference is from a base station. A next step (306) includes calculating an interference profile over the frame cycle. A next step (308) includes establishing a peak interference level. A next step (310) includes aligning the base station frame timing in response to the peak interference level.
    Type: Application
    Filed: May 6, 2008
    Publication date: November 12, 2009
    Applicant: MOTOROLA, INC.
    Inventors: Richard C. Lucas, David N. Freeman, Jonathan A. Gibbs