Patents by Inventor Wing F. Lo

Wing F. Lo 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: 10382883
    Abstract: A method for calibrating geolocation analytic system in a wireless network includes receiving a first data set including measurement data associated with a mobile device connected to the wireless network from a first data source. A second data set comprising external geo-location data associated with the mobile device is received from a second data source. The first data set is compared to the second data set to estimate geo-location of the mobile device and to identify one or more errors using calibration function. The identified one or more errors are corrected based on the comparison.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: August 13, 2019
    Assignee: NetScout Systems, Inc.
    Inventors: Robert William Froehlich, Karsten Gaenger, Wing F. Lo
  • Publication number: 20190082287
    Abstract: A method for calibrating geolocation analytic system in a wireless network includes receiving a first data set including measurement data associated with a mobile device connected to the wireless network from a first data source. A second data set comprising external geo-location data associated with the mobile device is received from a second data source. The first data set is compared to the second data set to estimate geo-location of the mobile device and to identify one or more errors using calibration function. The identified one or more errors are corrected based on the comparison.
    Type: Application
    Filed: September 8, 2017
    Publication date: March 14, 2019
    Inventors: Robert William Froehlich, Karsten Gaenger, Wing F. Lo
  • Patent number: 8259746
    Abstract: A communications system includes a network that is coupled to a number of terminals, at least some of which are capable of audio or other forms of real-time interactive data communications over the network. Each of the terminals includes a network adapter that is capable of detecting a collision with another terminal on the network. If a collision is detected, transmission of a data frame is aborted, and a backoff time delay is selected. The backoff time delay is selected from a group of delay periods that vary at a rate different than exponentially with a number of collisions. The group of one or more delay periods can contain delay periods that increase linearly with the number of collisions, delay periods that increase according to some power of n, where n is the number of collisions, or a delay period that is selected at random based on a predetermined mean backoff delay.
    Type: Grant
    Filed: October 25, 2007
    Date of Patent: September 4, 2012
    Assignee: Avaya Inc.
    Inventors: Wing F. Lo, Fran├žois F. Blouin
  • Patent number: 8045575
    Abstract: A communications system includes a network that is coupled to a number of terminals, at least some of which are capable of audio or other forms of real-time interactive data communications over the network. Each of the terminals includes a network adapter that is capable of detecting a collision with another terminal on the network. If a collision is detected, transmission of a data frame is aborted, and a backoff time delay is selected. The backoff time delay is selected from a group of delay periods that vary at a rate different than exponentially with a number of collisions. The group of one or more delay periods can contain delay periods that increase linearly with the number of collisions, delay periods that increase according to some power of n, where n is the number of collisions, or a delay period that is selected at random based on a predetermined mean backoff delay.
    Type: Grant
    Filed: October 25, 2007
    Date of Patent: October 25, 2011
    Assignee: Avaya Inc.
    Inventors: Wing F. Lo, Fran├žois F. Blouin
  • Patent number: 8037163
    Abstract: The present invention provides methods, devices, and systems for determining the availability of at least a part of a communications network in the context of alternate routing. Moreover, the present invention is adapted to consider network flow variations based on device outages all while accounting for the actual probability associated with various re-routing scenarios.
    Type: Grant
    Filed: January 8, 2008
    Date of Patent: October 11, 2011
    Assignee: Avaya Inc.
    Inventors: Wing F. Lo, Richard C. McNamara, Bahareh Momken, Bruce Robinson
  • Patent number: 7313105
    Abstract: A communications system includes a network that is coupled to a number of terminals, at least some of which are capable of audio or other forms of real-time interactive data communications over the network. Each of the terminals includes a network adapter that is capable of detecting a collision with another terminal on the network. If a collision is detected, transmission of a data frame is aborted, and a backoff time delay is selected. The backoff time delay is selected from a group of delay periods that vary at a rate different than exponentially with a number of collisions. The group of one or more delay periods can contain delay periods that increase linearly with the number of collisions, delay periods that increase according to some power of n, where n is the number of collisions, or a delay period that is selected at random based on a predetermined mean backoff delay.
    Type: Grant
    Filed: September 26, 2000
    Date of Patent: December 25, 2007
    Assignee: Nortel Networks Limited
    Inventors: Wing F. Lo, Francois F. Blouin
  • Patent number: 7024475
    Abstract: A modeling tool that is executable in a system includes a modeling application that is capable of deriving a predicted quality of communications in a represented communications system. A user may create a representation of a target communication system by using icons representing different network components to build the representation in a user interface. Each of the network components is associated with one or more performance parameters, such as packet delay, packet loss, and jitter for packet-based network components. An overall performance parameter, such as an overall packet delay, overall packet loss, and overall jitter may be derived based on the performance parameters for each of the network components. From the overall performance parameters, the expected or predicted performance of the target communications system may be determined by using an E-model in one arrangement.
    Type: Grant
    Filed: April 24, 2000
    Date of Patent: April 4, 2006
    Assignee: Nortel Networks Limited
    Inventors: Alireza Abaye, Wing F. Lo, Ralph R. Carsten, Bruce Robertson, Daniel Briere
  • Patent number: 6798786
    Abstract: A method and system of managing calls over a data network includes determining an available bandwidth of the data network. After a call request is received for establishing a call between at least two network terminals, one or more of a plurality of resource elements are selected in response to the call request based on the bandwidth of the data network. The resource elements, which can include codecs (coders/decoders), packet sizes (for carrying audio data), and others, are used in the requested call between the at least two network terminals. Further, a plurality of communities may be defined each including one or more terminals. One or more usage threshold values may be assigned to a link or links between communities, and a call request is processed based on the one or more usage threshold values. The processing includes at least one of determining whether to admit the call request and selecting resource elements to be used during a call between terminals over the link.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: September 28, 2004
    Assignee: Nortel Networks Limited
    Inventors: Wing F. Lo, Xuewen Li, Alireza Abaye
  • Patent number: 6522641
    Abstract: A fixed wireless point-to-multipoint distribution network for providing seamless communication coverage to plurality of subscribers that includes a plurality of base stations for providing wireless access to said subscriber; each base station having connectivity to one another on a first network layer via at least one of a number of IP and/or ATM switches, called IDCN switches; each IDCN switch having connectivity to another over a second network layer via a transport ring thereby enabling one user to communicate directly with another user in said first network layer, or externally of said first network layer via one of said IDCN switches. An integrated data centric network is provided that integrates voice, data and video services into a single network, defines user services by the end user by providing middleware to enable the end user to develop services and applications; and provides a carrier grade service with distributed networking and services.
    Type: Grant
    Filed: June 1, 1999
    Date of Patent: February 18, 2003
    Assignee: Nortel Networks Limited
    Inventors: Patrick Siu, Yair Bourlas, Richard J. Nowak, Wendy S. Smith, Wing F. Lo
  • Patent number: 6487183
    Abstract: A method for implementing an activity based resource assignment medium access control (MAC) protocol to allocate resources to subscribers in an interactive, multimedia, broadband satellite communications system. A plurality of channels is provided with at least one of said plurality of channels being assigned to each of a plurality of terminals. Utilization of the channel resources by the plurality of terminals is monitored and an evaluation is conducted of system needs based on the levels of activity and utilization of channel resources by the terminals. Requests for system resources by the terminals are communicated to a resource controller which calculates the system needs. The resource controller is utilized to adjust the channel resources based on the levels of activity and utilization of resources by the terminals. The adjustment provides active terminals as much resources as required during duration of their activity, subject to resource availability.
    Type: Grant
    Filed: December 21, 2001
    Date of Patent: November 26, 2002
    Assignee: Nortel Networks Limited
    Inventors: Wing F. Lo, Jeff L. Watson
  • Patent number: 6272315
    Abstract: Methods for switching a mobile between operation in an mobile satellite system mode and a terrestrial wireless mode. When operating in the terrestrial wireless mode, the mobile terminal will initiate an attempt to switch into the MSS mode when it nears the boundary of the coverage area for a terrestrial wireless system to which it is registered. Conversely, a mobile terminal operating in the MSS mode will regularly attempt to switch into the terrestrial wireless mode. For both, a switch between modes is contingent on the mobile terminal identifying a suitable system for registration therewith upon completing the switch between modes. The criteria for identifying a suitable system for selection purposes include the following: (1) the selected system is available, i.e., the mobile terminal is physically located within a coverage area for the selected system; (2) the mobile terminal is compatible with the selected system; and (3) the selected system is willing to accept the mobile terminal.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: August 7, 2001
    Assignee: Northern Telecom Limited
    Inventors: Jue Chang, Wing F. Lo, Won S. Kim
  • Patent number: 6122483
    Abstract: A satellite communication system provides multicast messaging services to subscriber units. Upon receipt of a multicast communication page from a satellite communication system network, a subscriber unit waits for a random delay period and then responds with an acknowledge signal. Based upon the time of receipt of the acknowledge signal, e.g., within one of a plurality of time periods, the satellite communication system network assigns the subscriber unit to one of a plurality of traffic channels. The satellite communication system infrastructure then sends a multicast communication message to the subscriber unit on the assigned traffic channel. The subscriber unit then waits for a random delay period and then responds with an acknowledge signal. The satellite communication system network then receives the acknowledge signal.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: September 19, 2000
    Assignee: Nortel Networks Limited
    Inventors: Wing F. Lo, Stewart O'Dell, Payam Maveddat
  • Patent number: 5710791
    Abstract: In methods and apparatus for assessing voice quality in AMPS cellular radio systems, a signal-to-noise ratio is estimated for a SAT signal of an RF channel, and the voice quality of the RF channel is inferred from the SAT signal-to-noise ratio.
    Type: Grant
    Filed: July 13, 1995
    Date of Patent: January 20, 1998
    Assignee: Northern Telecom Limited
    Inventors: Claude Royer, Charles P. Bernardin, Wing F. Lo
  • Patent number: 5293642
    Abstract: A method of providing an estimation of a mobile station's location in a cellular communication system having a plurality of base stations and mobile stations is disclosed. The mobile station's location is provided by measuring radio propagation parameters between the mobile station and each base station within propagation range of the mobile station. Then, a location probability density function (pdf) is found based on the measured radio propagation parameters. A joint probability density function (pdf) is then constructed by combining each individual function which is obtained. The location of the mobile station is then estimated from the resulting joint probability density function (pdf).
    Type: Grant
    Filed: December 19, 1990
    Date of Patent: March 8, 1994
    Assignee: Northern Telecom Limited
    Inventor: Wing F. Lo
  • Patent number: 5166929
    Abstract: The mobile station to base station access in a cellular radio system is a classical problem of random multiple access using a shared common channel. Many multiple access protocols have been invented in the past with varied degrees of success in improving the throughput of the multiple access channel. The current invention is a new multiple access protocol which enhances the throughput and reduces the access delay by providing feedback of the detailed status of the access channel from the base station to the mobile station. The feedback mechanism and multiple access protocol are also applicable to other types of radio or wire-based channels.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: November 24, 1992
    Assignee: Northern Telecom Limited
    Inventor: Wing F. Lo
  • Patent number: RE37301
    Abstract: The mobile station to base station access in a cellular radio system is a classical problem of random multiple access using a shared common channel. Many multiple access protocols have been invented in the past with varied degrees of success in improving the throughput of the multiple access channel. The current invention is a new multiple access protocol which enhances the throughput and reduces the access delay by providing feedback of the detailed status of the access channel from the base station to the mobile station. The feedback mechanism and multiple access protocol are also applicable to other types of radio or wire-based channels.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: July 31, 2001
    Assignee: Nortel Networks Limited
    Inventor: Wing F. Lo