Patents by Inventor Tak Ming Pang

Tak Ming Pang 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: 10701627
    Abstract: In one embodiment, a method implemented on a computing device includes: selecting a wireless access point (AP) to process from among a deployment of wireless access points (APs), defining a neighborhood based on the AP and neighboring APs, where the neighboring APs are within a one-hop radius of the AP, calculating a client distribution optimal received signal strength indicator (RSSI), where the client distribution optimal RSSI (CD optimal) is a minimum receiver start of packet detection threshold (RX-SOP) setting for maintaining existing client device coverage by the AP, calculating a neighbor relations optimal RSSI threshold (NR optimal), where the NR optimal is a function of at least a transmit power control threshold (TPC) for maintaining visibility between the AP and the neighboring APs, calculating an RX-SOP setting for the AP as a function of CD optimal and NR optimal, and applying the RX-SOP setting to the AP.
    Type: Grant
    Filed: February 21, 2019
    Date of Patent: June 30, 2020
    Assignee: Cisco Technology, Inc.
    Inventors: Vishal Desai, Tak Ming Pang, John Blosco
  • Publication number: 20190191369
    Abstract: In one embodiment, a method implemented on a computing device includes: selecting a wireless access point (AP) to process from among a deployment of wireless access points (APs), defining a neighborhood based on the AP and neighboring APs, where the neighboring APs are within a one-hop radius of the AP, calculating a client distribution optimal received signal strength indicator (RSSI), where the client distribution optimal RSSI (CD optimal) is a minimum receiver start of packet detection threshold (RX-SOP) setting for maintaining existing client device coverage by the AP, calculating a neighbor relations optimal RSSI threshold (NR optimal), where the NR optimal is a function of at least a transmit power control threshold (TPC) for maintaining visibility between the AP and the neighboring APs, calculating an RX-SOP setting for the AP as a function of CD optimal and NR optimal, and applying the RX-SOP setting to the AP.
    Type: Application
    Filed: February 21, 2019
    Publication date: June 20, 2019
    Inventors: Vishal Desai, Tak Ming Pang, John Blosco
  • Patent number: 10251123
    Abstract: In one embodiment, a method implemented on a computing device includes: selecting a wireless access point (AP) to process from among a deployment of wireless access points (APs), defining a neighborhood based on the AP and neighboring APs, where the neighboring APs are within a one-hop radius of the AP, calculating a client distribution optimal received signal strength indicator (RSSI), where the client distribution optimal RSSI (CD optimal) is a minimum receiver start of packet detection threshold (RX-SOP) setting for maintaining existing client device coverage by the AP, calculating a neighbor relations optimal RSSI threshold (NR optimal), where the NR optimal is a function of at least a transmit power control threshold (TPC) for maintaining visibility between the AP and the neighboring APs, calculating an RX-SOP setting for the AP as a function of CD optimal and NR optimal, and applying the RX-SOP setting to the AP.
    Type: Grant
    Filed: July 9, 2017
    Date of Patent: April 2, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Vishal Desai, Tak Ming Pang, John Blosco
  • Patent number: 10225180
    Abstract: A method is performed at a mesh access point (MAP) in a wireless mesh network including access points (APs) of a spanning tree being divided among multiple Internet Protocol (IP) subnets. The method includes receiving from a first parent AP to which the MAP is a child a first IP subnet identifier indicating the first IP subnet to which the first parent AP belongs. The method also includes obtaining a first IP address associated with the first IP subnet, roaming from the first to a second parent AP, receiving from the second parent AP a second IP subnet identifier indicating a second IP subnet to which the second parent AP belongs, determining if the first and second parent APs are both part of the same IP subnet, and determining whether to maintain connectivity with a current controller or establish connectivity to a new controller based on results of the determining.
    Type: Grant
    Filed: August 14, 2017
    Date of Patent: March 5, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward
  • Publication number: 20190014536
    Abstract: In one embodiment, a method implemented on a computing device includes: selecting a wireless access point (AP) to process from among a deployment of wireless access points (APs), defining a neighborhood based on the AP and neighboring APs, where the neighboring APs are within a one-hop radius of the AP, calculating a client distribution optimal received signal strength indicator (RSSI), where the client distribution optimal RSSI (CD optimal) is a minimum receiver start of packet detection threshold (RX-SOP) setting for maintaining existing client device coverage by the AP, calculating a neighbor relations optimal RSSI threshold (NR optimal), where the NR optimal is a function of at least a transmit power control threshold (TPC) for maintaining visibility between the AP and the neighboring APs, calculating an RX-SOP setting for the AP as a function of CD optimal and NR optimal, and applying the RX-SOP setting to the AP.
    Type: Application
    Filed: July 9, 2017
    Publication date: January 10, 2019
    Inventors: Vishal DESAI, Tak Ming Pang, John Blosco
  • Patent number: 10034300
    Abstract: In an example embodiment, an apparatus comprising an interface configured to communicate with at least one wireless transceiver, and a controller coupled to the interface. The controller is configured to determine a predefined characteristic such as current load and/or interference for a wireless channel associated with the at least one wireless transceiver. The controller is operable to suppress sending a probe response in response to the at least one wireless transceiver receiving a probe request, wherein how often probe responses are suppressed is based on the predefined characteristic for the wireless channel.
    Type: Grant
    Filed: June 10, 2010
    Date of Patent: July 24, 2018
    Assignee: Cisco Technology, Inc
    Inventors: Hari Rangarajan, Tak Ming Pang, Sandeep Shetty
  • Patent number: 9877251
    Abstract: Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.
    Type: Grant
    Filed: August 1, 2014
    Date of Patent: January 23, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Paul J. Stager, Tak Ming Pang, Evgeny Yankevich, Arnab Sengupta
  • Patent number: 9867083
    Abstract: In one embodiment, a method includes selecting at a network device, seed access points from a plurality of access points and assigning each of the seed access points to a wireless network controller. The seed access points join the assigned wireless network controllers before the remaining access points join the wireless network controllers. Each of the remaining access points is associated with one of the seed access points and joins the same wireless network controller as the seed access point. An apparatus and logic are also disclosed herein.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: January 9, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Hui Liu, Tak Ming Pang
  • Publication number: 20170346729
    Abstract: A method is performed at a mesh access point (MAP) in a wireless mesh network including access points (APs) of a spanning tree being divided among multiple Internet Protocol (IP) subnets. The method includes receiving from a first parent AP to which the MAP is a child a first IP subnet identifier indicating the first IP subnet to which the first parent AP belongs. The method also includes obtaining a first IP address associated with the first IP subnet, roaming from the first to a second parent AP, receiving from the second parent AP a second IP subnet identifier indicating a second IP subnet to which the second parent AP belongs, determining if the first and second parent APs are both part of the same IP subnet, and determining whether to maintain connectivity with a current controller or establish connectivity to a new controller based on results of the determining.
    Type: Application
    Filed: August 14, 2017
    Publication date: November 30, 2017
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward
  • Patent number: 9807813
    Abstract: In response to receiving a probe request from a mobile client, an access point determines whether it should suppress a probe response. The access point receives a probe request from a wireless client device, and prepares a probe response to respond to the probe request. The access point determines whether the wireless client device is likely to associate with the wireless access point. Responsive to a determination that the wireless client device is unlikely to associate with the wireless access point, the access point suppresses the transmission of the probe response.
    Type: Grant
    Filed: April 15, 2015
    Date of Patent: October 31, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Brian D. Hart, John Matthew Swartz, Joshua Suhr, Matthew A. Silverman, Tak Ming Pang
  • Patent number: 9769063
    Abstract: A wireless mesh network includes mesh access points (mesh APs) and a root access point (RAP) forming a root of a tree of the mesh APs in which the mesh APs are linked back to the RAP through parent-child relationships over wireless backhaul links. A mesh AP provides access to the mesh network via connections to wireless clients in one or more wireless local area networks (WLANs) served by the mesh AP. The mesh AP stores mappings between the one or more WLANs served by the mesh AP and one or more virtual local area networks (VLANs) configured on a wired network and to which the WLANs are assigned. The mesh AP receives mappings between the VLANs configured on the wired network and WLANs served by the mesh AP as known by the RAP. If the stored mappings and the received mappings differ, the mesh AP updates the stored mappings with the received mappings that differ from the stored mappings.
    Type: Grant
    Filed: June 6, 2016
    Date of Patent: September 19, 2017
    Assignee: Cisco Technology, Inc.
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward
  • Publication number: 20160309537
    Abstract: In response to receiving a probe request from a mobile client, an access point determines whether it should suppress a probe response. The access point receives a probe request from a wireless client device, and prepares a probe response to respond to the probe request. The access point determines whether the wireless client device is likely to associate with the wireless access point. Responsive to a determination that the wireless client device is unlikely to associate with the wireless access point, the access point suppresses the transmission of the probe response.
    Type: Application
    Filed: April 15, 2015
    Publication date: October 20, 2016
    Inventors: Brian D. Hart, John Matthew Swartz, Joshua Suhr, Matthew A. Silverman, Tak Ming Pang
  • Publication number: 20160285751
    Abstract: A wireless mesh network includes mesh access points (mesh APs) and a root access point (RAP) forming a root of a tree of the mesh APs in which the mesh APs are linked back to the RAP through parent-child relationships over wireless backhaul links. A mesh AP provides access to the mesh network via connections to wireless clients in one or more wireless local area networks (WLANs) served by the mesh AP. The mesh AP stores mappings between the one or more WLANs served by the mesh AP and one or more virtual local area networks (VLANs) configured on a wired network and to which the WLANs are assigned. The mesh AP receives mappings between the VLANs configured on the wired network and WLANs served by the mesh AP as known by the RAP. If the stored mappings and the received mappings differ, the mesh AP updates the stored mappings with the received mappings that differ from the stored mappings.
    Type: Application
    Filed: June 6, 2016
    Publication date: September 29, 2016
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward
  • Patent number: 9408249
    Abstract: A wireless mesh network includes mesh APs and a root AP forming a root of a tree of the mesh APs in which the mesh APs are linked back to the root AP over wireless backhaul links. The root AP has a wired connection to a wired network. An AP detects a loss of connectivity to a controller through which traffic associated with the AP is normally routed to and from the wired network. In response, if the AP is the root AP, the root AP operates as a proxy controller through which the traffic may be routed. The AP maintains connectivity with parent and child APs over the wireless backhaul links.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: August 2, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward
  • Patent number: 9357519
    Abstract: A first wireless device (e.g., an access point) receives a message from a second wireless device (e.g., a client device). The first device determines an angle-of-arrival of the message at a plurality of antennas of the first wireless device. The first device compares the angle-of-arrival with an angle-of-arrival threshold to determine whether to transmit a response message to the second wireless device. In one example, the first wireless device is a wireless access point device operating in a wireless network, the second wireless device is a wireless client device operating in the wireless network, the message is a probe request message and the response message is a probe response message.
    Type: Grant
    Filed: March 10, 2014
    Date of Patent: May 31, 2016
    Assignee: Cisco Technology, Inc.
    Inventors: Neil R. Diener, John Matthew Swartz, Paul J. Stager, Tak Ming Pang
  • Publication number: 20150304886
    Abstract: In one embodiment, a method includes selecting at a network device, seed access points from a plurality of access points and assigning each of the seed access points to a wireless network controller. The seed access points join the assigned wireless network controllers before the remaining access points join the wireless network controllers. Each of the remaining access points is associated with one of the seed access points and joins the same wireless network controller as the seed access point. An apparatus and logic are also disclosed herein.
    Type: Application
    Filed: April 17, 2014
    Publication date: October 22, 2015
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Hui Liu, Tak Ming Pang
  • Publication number: 20150264614
    Abstract: Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.
    Type: Application
    Filed: August 1, 2014
    Publication date: September 17, 2015
    Inventors: Paul J. Stager, Tak Ming Pang, Evgeny Yankevich, Arnab Sengupta
  • Publication number: 20150257117
    Abstract: A first wireless device (e.g., an access point) receives a message from a second wireless device (e.g., a client device). The first device determines an angle-of-arrival of the message at a plurality of antennas of the first wireless device. The first device compares the angle-of-arrival with an angle-of-arrival threshold to determine whether to transmit a response message to the second wireless device. In one example, the first wireless device is a wireless access point device operating in a wireless network, the second wireless device is a wireless client device operating in the wireless network, the message is a probe request message and the response message is a probe response message.
    Type: Application
    Filed: March 10, 2014
    Publication date: September 10, 2015
    Applicant: Cisco Technology, Inc.
    Inventors: Neil R. Diener, John Matthew Swartz, Paul J. Stager, Tak Ming Pang
  • Patent number: 9094223
    Abstract: Techniques are provided for delivering data to a wireless client device in a wireless network via a plurality of access points as the wireless client device roams from one access point to another. A wireless client device receives data via a first wireless access point in the wireless network. An impending roam of a wireless client device is detected. A set of one or more candidate wireless access points other than the first wireless access point is determined to which the wireless client device may potentially roam. The one or more wireless access points in the set are assigned to a multicast group, and the traffic is sent to the multicast group. A message containing a synchronized context enables a new wireless access point to send data to the wireless client device from a point where the first wireless access point stopped sending data to the wireless client device.
    Type: Grant
    Filed: October 27, 2014
    Date of Patent: July 28, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Hui Liu, Douglas Chan, Tak Ming Pang
  • Publication number: 20150156815
    Abstract: A wireless mesh network includes mesh APs and a root AP forming a root of a tree of the mesh APs in which the mesh APs are linked back to the root AP over wireless backhaul links. The root AP has a wired connection to a wired network. An AP detects a loss of connectivity to a controller through which traffic associated with the AP is normally routed to and from the wired network. In response, if the AP is the root AP, the root AP operates as a proxy controller through which the traffic may be routed. The AP maintains connectivity with parent and child APs over the wireless backhaul links.
    Type: Application
    Filed: December 3, 2013
    Publication date: June 4, 2015
    Applicant: Cisco Technology, Inc.
    Inventors: Tak Ming Pang, Robert C. Meier, Yanxin Na, Emburey Samrex Edward