Patents by Inventor Oscar Bejarano Chavez

Oscar Bejarano Chavez 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: 10932087
    Abstract: An enterprise system configures access point devices at an enterprise location to communicate with a location determination system. The location determination system receives wireless signal attributes of user computing devices broadcasting Wi-Fi signal data at the enterprise location from one or more access point devices. For a particular time window, the location determination system determines aggregated features of received wireless signal data across all access point devices, and classifies each of the user computing devices as moving or stationary by applying the wireless signal data to a model. For each of the user computing devices determined to be moving, the location determination system calculates a respective position of the user computing device based on the wireless signal data. For each of the user computing devices determined to be stationary, the location determination system does not calculate a respective position of the respective user computing device.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: February 23, 2021
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Huy Phuong Tran, Abhishek Mukherji, Rong Peng, Oscar Bejarano Chavez, Santosh Ghanshyam Pandey
  • Patent number: 10677885
    Abstract: Techniques are presented herein for computing angle-of-arrival estimates while switching antenna states during a packet unit for the general Orthogonal Frequency Division Multiple Access (OFMDA) case (including a single user). A wireless device computes channel estimates throughout the entire frame and not only during the training symbols. Consequently, the wireless device computes channel estimates for all antennas in its array within a single frame instead of having to wait for multiple frames.
    Type: Grant
    Filed: April 22, 2019
    Date of Patent: June 9, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Matthew A. Silverman, Oscar Bejarano Chavez, Paul J. Stager, David Kloper
  • Publication number: 20200112827
    Abstract: An enterprise system configures access point devices at an enterprise location to communicate with a location determination system. The location determination system receives wireless signal attributes of user computing devices broadcasting Wi-Fi signal data at the enterprise location from one or more access point devices. For a particular time window, the location determination system determines aggregated features of received wireless signal data across all access point devices, and classifies each of the user computing devices as moving or stationary by applying the wireless signal data to a model. For each of the user computing devices determined to be moving, the location determination system calculates a respective position of the user computing device based on the wireless signal data. For each of the user computing devices determined to be stationary, the location determination system does not calculate a respective position of the respective user computing device.
    Type: Application
    Filed: December 3, 2019
    Publication date: April 9, 2020
    Inventors: Huy Phuong Tran, Abhishek Mukherji, Rong Peng, Oscar Bejarano Chavez, Santosh Ghanshyam Pandey
  • Patent number: 10524272
    Abstract: In one embodiment, a control device associated with a wireless network of a given location determines a reference quality of location readings between access points and client devices based on using substantially all of an available wireless communication bandwidth. The control device may then determine channel state information (CSI) between the client devices and access points for each orthogonal frequency-division multiple access (OFDMA) resource unit (RU), and selects a subset of RUs for allocation to each respective client device, based on the subset of RUs allocated to each respective client device i) surpassing a determined threshold of certain parameters of the CSI, while also ii) providing a minimum quality of a location reading based on using only the subset of RUs as compared to the reference quality of location readings. The control device may then allocate the selected subset of RUs to each respective client device for location-preserving OFDMA-signaling-based communication.
    Type: Grant
    Filed: January 9, 2018
    Date of Patent: December 31, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Matt Silverman, Zhigang Gao, Oscar Bejarano Chavez, John Matthew Swartz, Santosh Ghanshyam Pandey
  • Publication number: 20190242970
    Abstract: Techniques are presented herein for computing angle-of-arrival estimates while switching antenna states during a packet unit for the general Orthogonal Frequency Division Multiple Access (OFMDA) case (including a single user). A wireless device computes channel estimates throughout the entire frame and not only during the training symbols. Consequently, the wireless device computes channel estimates for all antennas in its array within a single frame instead of having to wait for multiple frames.
    Type: Application
    Filed: April 22, 2019
    Publication date: August 8, 2019
    Inventors: Matthew A. Silverman, Oscar Bejarano Chavez, Paul J. Stager, David Kloper
  • Publication number: 20190215842
    Abstract: In one embodiment, a control device associated with a wireless network of a given location determines a reference quality of location readings between access points and client devices based on using substantially all of an available wireless communication bandwidth. The control device may then determine channel state information (CSI) between the client devices and access points for each orthogonal frequency-division multiple access (OFDMA) resource unit (RU), and selects a subset of RUs for allocation to each respective client device, based on the subset of RUs allocated to each respective client device i) surpassing a determined threshold of certain parameters of the CSI, while also ii) providing a minimum quality of a location reading based on using only the subset of RUs as compared to the reference quality of location readings. The control device may then allocate the selected subset of RUs to each respective client device for location-preserving OFDMA-signaling-based communication.
    Type: Application
    Filed: January 9, 2018
    Publication date: July 11, 2019
    Inventors: Matt Silverman, Zhigang Gao, Oscar Bejarano Chavez, John Matthew Swartz, Santosh Ghanshyam Pandey
  • Patent number: 10330770
    Abstract: Techniques are presented herein for computing angle-of-arrival estimates while switching antenna states during a packet unit for the general Orthogonal Frequency Division Multiple Access (OFMDA) case (including a single user). A wireless device computes channel estimates throughout the entire frame and not only during the training symbols. Consequently, the wireless device computes channel estimates for all antennas in its array within a single frame instead of having to wait for multiple frames.
    Type: Grant
    Filed: November 9, 2017
    Date of Patent: June 25, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Matthew A. Silverman, Oscar Bejarano Chavez, Paul J. Stager, David Kloper
  • Publication number: 20190137596
    Abstract: Techniques are presented herein for computing angle-of-arrival estimates while switching antenna states during a packet unit for the general Orthogonal Frequency Division Multiple Access (OFMDA) case (including a single user). A wireless device computes channel estimates throughout the entire frame and not only during the training symbols. Consequently, the wireless device computes channel estimates for all antennas in its array within a single frame instead of having to wait for multiple frames.
    Type: Application
    Filed: November 9, 2017
    Publication date: May 9, 2019
    Inventors: Matthew A. Silverman, Oscar Bejarano Chavez, Paul J. Stager, David Kloper
  • Patent number: 10243665
    Abstract: Presented herein are techniques to ensure power emitted by APs during a cooperative MIMO transmission is within certain limits. For a transmission to be made from two or more wireless access points using cooperative multiple-input multiple-output (MIMO) techniques, a measure of separation is determined between the two or more access points. Precoding of signals to be transmitted by the two or more access points is adjusted so as to derate the signals to be transmitted or disable the cooperative nature of the transmission from the two or more access point depending on the measure of separation so that a combined output power from the two or more access points is within a limit.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: March 26, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Fred J. Anderson, Oscar Bejarano Chavez, Matthew A. Silverman, Paul J. Stager
  • Publication number: 20190068289
    Abstract: Presented herein are techniques to ensure power emitted by APs during a cooperative MIMO transmission is within certain limits. For a transmission to be made from two or more wireless access points using cooperative multiple-input multiple-output (MIMO) techniques, a measure of separation is determined between the two or more access points. Precoding of signals to be transmitted by the two or more access points is adjusted so as to derate the signals to be transmitted or disable the cooperative nature of the transmission from the two or more access point depending on the measure of separation so that a combined output power from the two or more access points is within a limit.
    Type: Application
    Filed: October 2, 2017
    Publication date: February 28, 2019
    Inventors: Fred J. Anderson, Oscar Bejarano Chavez, Matthew A. Silverman, Paul J. Stager