Patents by Inventor Kelvin K. Ho

Kelvin K. Ho 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).

  • Patent number: 5278892
    Abstract: A CDMA cellular radio-telephone system (FIG. 2) comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). A unique combination of a static addressing plan that uses a different LAPD DLCI (302 in FIG. 7) for each unidirectional virtual call path, direct cell (202)-to-cell and cell-to-call-processing unit (264 in FIG. 5) control information exchanges, and packet-switching techniques that permit call traffic and control communications to share call paths and permit different call paths to share physical resources, is applied to call processing. This enables soft handoffs (FIGS. 27-29) to be handled in a manner transparent to the parties to the call and without significant involvement of system control elements (134 and 261 in FIG. 2) whose involvement would adversely impact the system's call-handling capacity.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: January 11, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Brian D. Bolliger, Talmage P. Bursh, Jr., Kelvin K. Ho, Alan S. Mulberg, LaJeana N. Roberts, Kenneth F. Smolik, Douglas A. Spencer, Kenneth W. Strom, John S. Thompson
  • Patent number: 5195090
    Abstract: A wireless-access communications system, such as a CDMA cellular radio-telephone system (FIG. 2), comprises a packet-switched communications network (202, 207, 201) that interconnects cells (base stations; 202) with each other and with the public telephone network (100). Traffic of individual calls is packetized, and packet-bearing frames (300 in FIG. 7) of a plurality of calls are then statistically multiplexed and frame-relayed through the network to yield the high capacity, efficiency, and speed of traffic transport and handoff required for a CDMA cellular system. At each call processing unit (264 in FIG. 5), individual calls are handled by individual service circuits (602 and 612) which perform speech-processing functions such as coding and decoding, tone insertion, and echo cancellation, and packet-to-circuit-switched-PCM traffic conversion.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: March 16, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Brian D. Bolliger, Talmage P. Bursh, Jr., Marc K. Dennison, Michael J. English, Charles Y. Farwell, Michel L. Hearn, Richard M. Heidebrecht, Kelvin K. Ho, Kenneth Y. Ho, David M. Kissel, Paul E. Miller, Richard D. Miller, Alan S. Mulberg, LaJeana N. Roberts, Michael A. Smith, Kenneth F. Smolik, Douglas A. Spencer, Kenneth W. Strom, John S. Thompson, Richard A. Windhausen
  • Patent number: 5195091
    Abstract: A CDMA cellular radio-telephone system (FIG. 2) has switching systems (201) synchronized to public telephone network (100) timing signals (600), and radio telephones (203) and cell base stations (202) synchronized to a different clock (1000). Transmission delays between the cell base stations and the telephone network are variable. Switching systems include digital communications interfaces (264) to the telephone system, whose connections to the telephone system are synchronized to the telephone system, and whose connections to the cells are nominally also synchronized to the telephone system but whose processor (602) operates for each call within predefined windows (1302, 1402) of phase relationships to the operation of the cell that is handling the call, and occasionally adjusts (FIGS. 13-16) its phase relationships to the operation of the telephone system to achieve and maintain its operation within the predefined windows.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: March 16, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Charles Y. Farwell, Michel L. Hearn, Richard M. Heidebrecht, Kelvin K. Ho, Douglas A. Spencer
  • Patent number: 5184347
    Abstract: A CDMA cellular radio-telephone system (FIG. 2) has switching systems (201) synchronized to public telephone network (100) timing signals (600), and radio telephones (203) and cell base stations (202) synchronized to different clock (1000). Transmission delays between the cell base stations and the telephone network are variable. Switching systems include digital communications interfaces (264) to the telephone system, whose connections to the telephone system are synchronized to the telephone system, and whose connections to the cells are nominally also synchronized to the telephone system but whose processor (602) operates for each call within predefined windows (1302, 1402) of phase relationships to the operation of the cell that is handling the call, and occasionally adjusts (FIGS. 13-16) its phase relationships to the operation of the telephone system to achieve and maintain its operation within the predefined windows.
    Type: Grant
    Filed: July 9, 1991
    Date of Patent: February 2, 1993
    Assignee: AT&T Bell Laboratories
    Inventors: Charles Y. Farwell, Michel L. Hearn, Richard M. Heidebrecht, Kelvin K. Ho, Douglas A. Spencer