Patents by Inventor Bretton Douglas
Bretton Douglas 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).
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Patent number: 9236928Abstract: An apparatus and method for operating a Multiple Input Multiple Output (MIMO)-capable subscriber node are disclosed. In one embodiment, an apparatus includes a MIMO-capable physical layer transceiver and a Medium Access Control (MAC) layer block that measures a received transmission to determine channel conditions. Upon receiving a transmission wherein said channel conditions meet specified conditions, the MAC layer block transmits a message to an access point indicating that the apparatus wants to switch between a non-MIMO mode and a MIMO mode, and upon receiving an acknowledgement, the MAC layer block switches between the non-MIMO mode and the MIMO mode. An apparatus for operating an access node is also disclosed.Type: GrantFiled: November 18, 2013Date of Patent: January 12, 2016Assignee: Cisco Technology, Inc.Inventors: Ozgur Gurbuz, David Pignatelli, David Stephenson, Eldad Perahia, Bretton Douglas, Ender Ayanoglu
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Patent number: 9131029Abstract: Multiple Input Multiple Output (MIMO) technology in conjunction with the IEEE 802.11 standard enables simultaneous communication of data packets to or from multiple users in the same frequency. Spatial divisional multiple access (SDMA) is thus provided. In this way, system capacity can be increased to an extent that depends on available antenna resources and the multipath characteristics of the communication channel. Doubling or quadrupling of network throughput can be achieved.Type: GrantFiled: April 7, 2014Date of Patent: September 8, 2015Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli, David Stephenson
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Patent number: 9054934Abstract: A specialized preamble is provided to facilitate matrix channel estimation of a MIMO channel. In a particular implementation, a channel training preamble provided by the IEEE 802.11a standard is modified to facilitate MIMO channel estimation.Type: GrantFiled: December 19, 2013Date of Patent: June 9, 2015Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli
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Patent number: 8737328Abstract: Multiple Input Multiple Output (MIMO) technology in conjunction with the IEEE 802.11 standard enables simultaneous communication of data packets to or from multiple users in the same frequency. Spatial divisional multiple access (SDMA) is thus provided. In this way, system capacity can be increased to an extent that depends on available antenna resources and the multipath characteristics of the communication channel. Doubling or quadrupling of network throughput can be achieved.Type: GrantFiled: June 28, 2011Date of Patent: May 27, 2014Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli, David Stephenson
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Patent number: 8693450Abstract: In one embodiment, different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.Type: GrantFiled: June 4, 2010Date of Patent: April 8, 2014Assignee: Cisco Technology, Inc.Inventors: Tania Sung-Yi Chen, Bretton Douglas, Arnold Bilstad
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Patent number: 8644430Abstract: A specialized preamble is provided to facilitate matrix channel estimation of a MIMO channel. In a particular implementation, a channel training preamble provided by the IEEE 802.11a standard is modified to facilitate MIMO channel estimation.Type: GrantFiled: October 30, 2012Date of Patent: February 4, 2014Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli
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Patent number: 8625507Abstract: An apparatus and method for operating a Multiple Input Multiple Output (MIMO)-capable subscriber node are disclosed. In one embodiment, an apparatus includes a MIMO-capable physical layer transceiver and a Medium Access Control (MAC) layer block that measures a received transmission to determine channel conditions. Upon receiving a transmission wherein said channel conditions meet specified conditions, the MAC layer block transmits a message to an access point indicating that the apparatus wants to switch between a non-MIMO mode and a MIMO mode, and upon receiving an acknowledgement, the MAC layer block switches between the non-MIMO mode and the MIMO mode. An apparatus for operating an access node is also disclosed.Type: GrantFiled: March 7, 2011Date of Patent: January 7, 2014Assignee: Cisco Technology, Inc.Inventors: Ozgur Gurbuz, David Pignatelli, David Stephenson, Eldad Perahia, Bretton Douglas, Ender Ayanoglu
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Patent number: 8374105Abstract: A specialized preamble is provided to facilitate matrix channel estimation of a MIMO channel. In a particular implementation, a channel training preamble provided by the IEEE 802.11a standard is modified to facilitate MIMO channel estimation.Type: GrantFiled: January 28, 2008Date of Patent: February 12, 2013Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli
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Patent number: 8369657Abstract: 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: GrantFiled: March 6, 2012Date of Patent: February 5, 2013Assignee: Cisco Technology, Inc.Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
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Patent number: 8331977Abstract: A search algorithm to find a globally optimal radio plan for a wireless network, including assignments of frequency and transmission power to multiple access points. Two different evaluation metrics are used in order to provide an optimal solution in a reasonable time period. Frequency searches are performed using a special rapid evaluation metric. Transmission powers are selected using a more refined metric that estimates data throughput. The search results are deterministic and execution time is also substantially deterministic.Type: GrantFiled: February 7, 2012Date of Patent: December 11, 2012Assignee: Cisco Technology, Inc.Inventors: Bretton Douglas, Timothy Olson
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Publication number: 20120163331Abstract: 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: ApplicationFiled: March 6, 2012Publication date: June 28, 2012Applicant: CISCO TECHNOLOGY, INC.Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
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Publication number: 20120134290Abstract: A search algorithm to find a globally optimal radio plan for a wireless network, including assignments of frequency and transmission power to multiple access points. Two different evaluation metrics are used in order to provide an optimal solution in a reasonable time period. Frequency searches are performed using a special rapid evaluation metric. Transmission powers are selected using a more refined metric that estimates data throughput. The search results are deterministic and execution time is also substantially deterministic.Type: ApplicationFiled: February 7, 2012Publication date: May 31, 2012Applicant: CISCO TECHNOLOGY, INC.Inventors: Bretton Douglas, Timothy Olson
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Patent number: 8155482Abstract: 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: GrantFiled: July 1, 2008Date of Patent: April 10, 2012Assignee: Cisco Technology, Inc.Inventors: Douglas Chan, Brian Donald Hart, Bretton Douglas
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Patent number: 8140104Abstract: A search algorithm to find a globally optimal radio plan for a wireless network, including assignments of frequency and transmission power to multiple access points. Two different evaluation metrics are used in order to provide an optimal solution in a reasonable time period. Frequency searches are performed using a special rapid evaluation metric. Transmission powers are selected using a more refined metric that estimates data throughput. The search results are deterministic and execution time is also substantially deterministic.Type: GrantFiled: January 27, 2009Date of Patent: March 20, 2012Assignee: Cisco Technology, Inc.Inventors: Bretton Douglas, Timothy Olson
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Patent number: 7995525Abstract: Multiple Input Multiple Output (MIMO) technology in conjunction with the IEEE 802.11 standard enables simultaneous communication of data packets to or from multiple users in the same frequency. Spatial divisional multiple access (SDMA) is thus provided. In this way, system capacity can be increased to an extent that depends on available antenna resources and the multipath characteristics of the communication channel. Doubling or quadrupling of network throughput can be achieved.Type: GrantFiled: January 28, 2008Date of Patent: August 9, 2011Assignee: Cisco Technology, Inc.Inventors: Eldad Perahia, Bretton Douglas, David Pignatelli, David Stephenson
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Patent number: 7929412Abstract: An apparatus and method for operating a Multiple Input Multiple Output (MIMO)-capable subscriber node are disclosed. In one embodiment, an apparatus includes a MIMO-capable physical layer transceiver and a Medium Access Control (MAC) layer block that measures a received transmission to determine channel conditions. Upon receiving a transmission wherein said channel conditions meet specified conditions, the MAC layer block requests an access point for permission to switch between a non-MIMO mode and a MIMO mode, and upon receiving permission, the MAC layer block switches between the non-MIMO mode and the MIMO mode. An apparatus for operating an access node is also disclosed.Type: GrantFiled: October 16, 2007Date of Patent: April 19, 2011Assignee: Cisco Technology, Inc.Inventors: Ozgur Gurbuz, David Pignatelli, David Stephenson, Eldad Perahia, Bretton Douglas, Ender Ayanoglu
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Patent number: 7813385Abstract: Systems and methods for adapting IEEE 802.11 wireless communications for environments involving long propagation delays. Improved system throughput and stability are provided. Propagation delays are measured systematically and used to adjust contention timing boundaries and a common time slot duration. This reduces the probability of collision in the CSMA/CA mode of the IEEE 802.11 standard. One particular application is a point-to-multipoint campus bridge network.Type: GrantFiled: March 1, 2004Date of Patent: October 12, 2010Assignee: Cisco Technology, Inc.Inventors: Sang Kyoon Hyun, Bretton Douglas
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Publication number: 20100246551Abstract: In one embodiment, different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.Type: ApplicationFiled: June 4, 2010Publication date: September 30, 2010Applicant: Cisco Technology, Inc.Inventors: Tania Sung-Yi Chen, Bretton Douglas, Arnold Bilstad
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Patent number: 7760692Abstract: Significant improvements in throughput of networks employing disparate physical layer standards are provided. Different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.Type: GrantFiled: May 3, 2004Date of Patent: July 20, 2010Assignee: Cisco Technology, Inc.Inventors: Tania Sung-Yi Chen, Bretton Douglas, Arnold Bilstad
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Patent number: 7688762Abstract: In an example embodiment, a number of contending nodes and colliding nodes for a plurality of links of a network is determined. The capacity of each of the plurality of links is determined. A sum of the traffic demand of each of the plurality of links divided the throughput of each of the plurality of links is used to form a cost function for the network. One, or more, of a group consisting of a plurality of frequency assignments, a plurality of transmit powers, and a plurality of clear channel assessment (CCA) values is searched to obtain a global minimum for the cost function. The frequency assignments, transmit powers, and/or CCA values providing the global minimum for the cost function are selected.Type: GrantFiled: March 21, 2007Date of Patent: March 30, 2010Assignee: Cisco Technology, Inc.Inventors: Bretton Douglas, Brian Hart