Patents by Inventor Joel Kao

Joel Kao 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: 6148194
    Abstract: An improved radio deployment tool (RDT) for determining cell boundaries is disclosed. An RDT used to carry-out active deployment procedures consists of an RDT wireless handset (RDTWH) that a deployment engineer uses to generate test signals, and an RDT base station (RDTBS) that is used to measure the RSSI of the test signals sent by the RDTWH. The RDTBS factors in the impact of short-term fades and dispersion, as well as long-term fading, by measuring and processing bit error rate (BER) and received signal strength intensity (RSSI) levels. BER levels can be measured for signals whose RSSI-levels have been driven into a testing range at which signals are susceptible to short-term fades and dispersion. A sufficient resolution of BER measurements is achieved by filling the payload fields of test packets exchanged by the RDTWH and RDTBS, with BER test data. The payload fields of the test packets can be filled by pressing down the mute button of the RDTWH.
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: November 14, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Joel Kao, Roland A. Smith, William Bird
  • Patent number: 6075985
    Abstract: A fixed wireless access system includes a base station for bidirectional communication with a switching center, a private branch exchange (PBX) for bidirectional communication with a plurality of user stations, and a wireless trunk interface (WTI). The WTI communicates with the base station over a bidirectional wireless air link, and with the PBX over a bidirectional trunk line. Since a wireless link is established between a dual radio unit (DRU) at the base station and a transceiver at the WTI, the slots normally allocated to the directory number of the called and calling parties in the current air interface, must be used to identify the transceiver involved in the exchange of information. Therefore, the DN of the called station behind the PBX is transmitted to the WTI using other fields of the air interface, and presented to PBX in a format acceptable for establishing a correct connection (DID service).
    Type: Grant
    Filed: January 23, 1997
    Date of Patent: June 13, 2000
    Assignee: Nortel Networks Corporation
    Inventor: Joel Kao