Patents by Inventor Venugopal Veeravalli

Venugopal Veeravalli 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: 6167035
    Abstract: A method for designing a soft handoff region in a wireless communications system. An inner region having an outer edge defined by a first radius is selected, wherein a mobile station communicates only with the base station within the inner region and has a selected outage probability at the outer edge of the inner region. Next, a soft handoff region having an outer edge defined by a second radius and an inner edge defined by the first radius is selected, wherein the mobile station within the soft handoff region has the selected outage probability. Actual coverage region having an outer edge defined by a third radius, wherein the third radius is selected to match soft handoff regions of other cells adjacent to the cell.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: December 26, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Venugopal Veeravalli, Andrew Sendonaris, Nikhil Jain, Seshu Madhava Peddy
  • Patent number: 6097956
    Abstract: Accurate calculation of the probability of outage for a cell within a CDMA network is utilized to relate cell coverage to cell capacity. Based on a desired probability of outage, the coverage of the cell may be calculated for an average number of users within the cell. The calculation is independent of the admission policy employed to achieve the specified average number of users. The resulting closed form expression for the tradeoff between coverage and carried traffic allows an optimal design of a CDMA network.
    Type: Grant
    Filed: October 24, 1997
    Date of Patent: August 1, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Venugopal Veeravalli, Andrew Sendonaris, Nikhil Jain
  • Patent number: 6094580
    Abstract: Provided herein is a computer-implemented method for generating an optimized cellular-network cell-site plan for an area. A plurality of cellular-traffic demand nodes distributed across the area is provided. Each cellular-traffic demand node of the plurality of cellular-traffic demand nodes has an associated weighting characteristics set. The plurality of nodes are consolidated into a plurality of centroids. Each centroid represents a number of nodes that come within a traffic threshold. A potential cell site is positioned on each of the centroids. Each potential cell site has an associated base-transmitter-station parameter characteristics set. The demand node coverage of each potential cell site is determined with respect to a signal strength of the potential cell site. From the plurality of potential cell sites a minimized cell-site subset is selected while maintaining sufficient cellular service coverage of the plurality of demand nodes.
    Type: Grant
    Filed: October 16, 1997
    Date of Patent: July 25, 2000
    Assignee: Nortel Networks Corporation
    Inventors: Chang Yu, Sairam Subramanian, Andrew Sendonaris, Sheng-Chou Lin, Mohamed Landolsi, Nikhil Jain, Seshu Madhavapeddy, Stone Tseng, Venugopal Veeravalli
  • Patent number: 6085106
    Abstract: The optimal power allocation process of the present invention allocates power between two base stations, serving a given mobile radiotelephone, during soft hand-off. A minimum total transmit power is chosen initially. The minimum total transmit power level, the path losses for each base station, the maximum transmit power for each base station, and the minimum allowed received power are all used to generate a range of values for a transmit power level multiplier, .alpha.. The multiplier is used to allocate the total transmit power among the base stations. This process is performed until the probability of bit error is less than a maximum threshold.
    Type: Grant
    Filed: July 29, 1997
    Date of Patent: July 4, 2000
    Assignee: Nortel Networks Limited
    Inventors: Andrew Sendonaris, Venugopal Veeravalli, Mohamed Landolsi, Abdel-Ghani Daraiseh