Patents by Inventor Randall R. Stewart

Randall R. Stewart 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).

  • Method for evaluating a communication link between a first and a second communication site
    Patent number: 6134221
    Abstract: The present invention provides a method for evaluating a communication link between a first communication site and a second communication site. The first and second communication sites increment a sent counter and reset a received counter upon sending a message to the other communication site. Each communication site also increments a received counter and reset a sent counter upon receiving a message from the other communication site. When the sent counter exceeds a sent threshold, the communication system site sends an alert that the communication link is down. When the received counter exceeds a predetermined percentage of the other communication site's sent counter, the site sends a message to the other communication site to let the other communication system site know that it is still receiving messages.
    Type: Grant
    Filed: April 15, 1999
    Date of Patent: October 17, 2000
    Assignee: Motorola, Inc.
    Inventors: Randall R. Stewart, Qiaobing Xie, Phillip D. Neumiller
  • Method and apparatus for performing distribution in a communication system
    Patent number: 6072790
    Abstract: A switch (101) performs distribution functions by distributing packets to base stations that were most recently heard from. More particularly, as a gateway (115) provides frames to the switch (101), the switch (101) distributes the frames to all base stations in communication with a remote unit (113). In order to determine the plurality of base stations requiring the frames, an identification of base stations (on a per-call basis) currently backhauling data to the switch (101) for the call is maintained. The switch (101) then distributes frames received from the gateway (115) to those base stations currently providing uplink frames to the switch (101) for the particular call.
    Type: Grant
    Filed: May 13, 1999
    Date of Patent: June 6, 2000
    Assignee: Motorola, Inc.
    Inventors: Phillip D. Neumiller, Peter Lei, Randall R. Stewart
  • Method of switching a call to a multipoint conference call in a H.323 communication compliant environment
    Patent number: 6018360
    Abstract: A method of switching a call to a multipoint conference call includes sending a message (201) from a first terminal (105-T1) to a gatekeeper (102) which provides address translation and control access to a shared network medium (101). The call is initially established as a point to point communication between first terminal (101) and a second terminal (105-TN) over shared network medium (101) while complying with H.323 standard. Message (201) contains a request for the multipoint conference call. The method furthermore includes selecting a multipoint control unit (104) connected to shared network medium (101) to allocate resources for the multipoint conference call, and then switching the call to the multipoint conference call via the allocated resources. Thereby, the initial call is switched to a multipoint conference call without interrupting the initial call.
    Type: Grant
    Filed: September 9, 1998
    Date of Patent: January 25, 2000
    Assignee: Motorola, Inc.
    Inventors: Randall R. Stewart, Qiaobing Xie