Patents by Inventor Douglas Chan

Douglas Chan 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).

  • Pinning and cascading avoidance in dynamic channel assignment for wireless LANS
    Patent number: 8289901
    Abstract: Techniques are provided to determine channel assignments for wireless access point (AP) devices in a wireless local area network (WLAN). From each of a plurality of AP devices operating at least one of a plurality of channels in the WLAN, wireless activity data is received that represents activity in each channel associated with signals of devices operating in the WLAN and associated with signals and energy from devices that are not operating in the WLAN as detected by the AP devices by receiving radio frequency energy in each of the plurality of channels.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: October 16, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Predrag Tosic, Sandeep Jay Shetty, Douglas Chan
  • Selecting Wider Bandwidth Channels in a Wireless Network
    Publication number: 20120163331
    Abstract: Techniques are provided for selecting channels for a wider bandwidth operation mode of a wireless network, such as wireless network that operates in accordance with the IEEE 802.11n amendment. Alignments of so-called primary and secondary channels are selected to mitigate interference. Interfering sources, such as other transceivers or external interferers, or the energy from their transmissions, are identified and channels are selected. The selected channels are analyzed to determine whether primary-secondary channel assignments for the selected channels are feasible.
    Type: Application
    Filed: March 6, 2012
    Publication date: June 28, 2012
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
  • Selecting wider bandwidth channels in a wireless network
    Patent number: 8155482
    Abstract: Techniques are provided for selecting channels for a wider bandwidth operation mode of a wireless network, such as wireless network that operates in accordance with the IEEE 802.11n amendment. Alignments of so-called primary and secondary channels are selected to mitigate interference. Interfering sources, such as other transceivers or external interferers, or the energy from their transmissions, are identified and channels are selected. The selected channels are analyzed to determine whether primary-secondary channel assignments for the selected channels are feasible.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: April 10, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
  • Pinning and Cascading Avoidance in Dynamic Channel Assignment for Wireless LANS
    Publication number: 20100238871
    Abstract: Techniques are provided to determine channel assignments for wireless access point (AP) devices in a wireless local area network (WLAN). From each of a plurality of AP devices operating at least one of a plurality of channels in the WLAN, wireless activity data is received that represents activity in each channel associated with signals of devices operating in the WLAN and associated with signals and energy from devices that are not operating in the WLAN as detected by the AP devices by receiving radio frequency energy in each of the plurality of channels.
    Type: Application
    Filed: March 17, 2009
    Publication date: September 23, 2010
    Applicant: Cisco Technology, Inc.
    Inventors: Predrag Tosic, Sandeep Jay Shetty, Douglas Chan
  • Selecting Wider Bandwidth Channels in a Wireless Network
    Publication number: 20090067403
    Abstract: Techniques are provided for selecting channels for a wider bandwidth operation mode of a wireless network, such as wireless network that operates in accordance with the IEEE 802.11n amendment. Alignments of so-called primary and secondary channels are selected to mitigate interference. Interfering sources, such as other transceivers or external interferers, or the energy from their transmissions, are identified and channels are selected. The selected channels are analyzed to determine whether primary-secondary channel assignments for the selected channels are feasible.
    Type: Application
    Filed: July 1, 2008
    Publication date: March 12, 2009
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
  • Systems and methods to detect collisions in channel sense multiple access communications
    Publication number: 20060245448
    Abstract: Methods and systems to perform collision detection (CD) in a communication network.
    Type: Application
    Filed: March 14, 2006
    Publication date: November 2, 2006
    Applicant: Cornell Research Foundation, Inc.
    Inventors: Douglas Chan, Toby Berger
  • Methods and systems for channel sensing multiple acces communication with multipacket reception
    Publication number: 20060221992
    Abstract: Methods and Systems for communication using carrier sense multiple access (CSMA) with multipacket reception (MPR).
    Type: Application
    Filed: March 14, 2006
    Publication date: October 5, 2006
    Applicant: Cornell Research Foundation, Inc.
    Inventors: Douglas Chan, Toby Berger