Patents by Inventor Helen Wong

Helen Wong 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).

  • Cellular telecommunications network having seamless interoperability between exchanges while supporting operation in multiple frequency hyperbands
    Patent number: 5761623
    Abstract: A system and method of providing seamless interoperability for a mobile station roaming between cellular telecommunication systems operating in multiple hyperbands such as the 1900-MHz PCS hyperband and the 800-MHz cellular telephone hyperband, utilizing United States cellular standards. An enhanced inter-exchange communications protocol based on IS-41 is utilized to communicate information required for seamless interoperability between mobile switching centers (MSCs). The enhanced inter-exchange communications protocol comprises a plurality of signaling messages and a plurality of modified message parameters within the signaling messages. The modified message parameters are modified to include information elements required for seamless interoperability between the multi-hyperband capable exchanges and are added as optional (overriding) parameters to the signaling messages.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: June 2, 1998
    Assignee: Telefonaktiebologet LM Ericsson (publ)
    Inventors: Francis Lupien, Helen Wong