Brian D Hart

US Patent:

7391368, Jun 24, 2008

Filed:

Mar 6, 2007

Appl. No.:

11/682649

Inventors:

Zhigang Gao - Richfield OH, US
Paul Stager - Cuyahoga Falls OH, US
Bretton Douglas - San Jose CA, US
Brian Hart - Sunnyvale CA, US
James Amos - North Canton OH, US
Yoonill Lee - Medina OH, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G01S 1/24

US Classification:

342387, 342442

Abstract:

In an example embodiment, a time of arrival circuit coupled to a wireless transceiver configured to determine a time of arrival of a wireless signal. The time of arrival circuit is operative to perform a coarse-scale frequency domain correlation of the actual samples with a predetermined ideal sample. The time of arrival circuit determines a maximum coarse correlation coefficient. The time delay circuit is operative to determine a plurality of fine correlation coefficients by interpolating around the peak coarse correlation coefficient. The time of arrival circuit determines a maximum correlation coefficient from the plurality of fine correlation coefficients and a time delay associated with the maximum correlation coefficient, the time of arrival is based on the time delay associated with the maximum correlation coefficient.

US Patent:

8248233, Aug 21, 2012

Filed:

Apr 27, 2009

Appl. No.:

12/430260

Inventors:

Matthew Aaron Silverman - Richfield OH, US
Santosh G. Pandey - Santa Clara CA, US
Brian Donald Hart - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

G08B 1/08

US Classification:

34053913, 3406861, 34235723, 367901, 701214, 701221

Abstract:

In one embodiment, a method includes obtaining location information associated with a remote device, and processing the location information. Processing the location information includes determining if the remote device is mobile. The method also includes configuring a filter such that at least one parameter indicates that the remote device is mobile if the remote device is mobile, and configuring the filter such that the at least one parameter indicates that the remote device is approximately stationary if the remote device is not mobile. The filter is applied to the location information to generate a filtered location estimate which is arranged to estimate a location of the remote device.

US Patent:

8249049, Aug 21, 2012

Filed:

Mar 17, 2009

Appl. No.:

12/405383

Inventors:

Matthew Aaron Silverman - Richfield OH, US
Paul Jeffrey Stager - Akron OH, US
Brian Donald Hart - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04J 3/06
H04L 12/26
G06F 15/177

US Classification:

370350, 370228, 370352, 370349, 370503, 370516, 370463, 370466, 370509, 370252, 709219, 709220, 709224

Abstract:

In an example embodiment, a method for synchronizing clocks between a plurality of clocked devices where one of the plurality of clocked devices is not directly synchronized with another of the plurality of clocked devices. Clock offset and a clock drift between a first clock associated with a first device and a second clock associated with a second is directly determined based on signals exchanged between the first and second devices. Clock offset and clock drift between the second clock and a third clock associated with a third device is directly determined based on signals exchanged between the second and third devices. A clock offset and clock drift between the first clock and third clock is determined based on a difference between the clock offset and drift between the first and second clocks and the clock offset and drift between the second and third clocks.

US Patent:

8325696, Dec 4, 2012

Filed:

Jul 29, 2009

Appl. No.:

12/511378

Inventors:

Neil Robert Diener - Hudson OH, US
Abhijit Kumar Choudhury - Cupertino CA, US
Brian Donald Hart - Sunnyvale CA, US
David S. Stephenson - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04W 4/00
H04B 7/212
H04J 1/00

US Classification:

370341, 370322, 370329, 370343, 370348

Abstract:

In an example embodiment described herein is an apparatus comprising a wireless transceiver and channel selection logic coupled to the wireless transceiver and operable to select an operating frequency for the wireless transceiver. The channel selection logic is configured to reserve a dedicated channel having a special identifier. The channel selection logic is configured to have the wireless transceiver advertise the dedicated service on a normal operating frequency. The channel selection logic is responsive to receiving a request from a wireless device via the wireless transceiver on the normal operating frequency to use the dedicated channel to switch to the dedicated channel and establish communications with the wireless device on the dedicated channel.

US Patent:

8369305, Feb 5, 2013

Filed:

Jun 30, 2008

Appl. No.:

12/164474

Inventors:

Neil R. Diener - Hudson OH, US
Gary L. Sugar - Cleveland OH, US
Brian Donald Hart - Sunnyvale CA, US
Igal Gutkin - Redwood City CA, US
David Kloper - Hudson OH, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B 7/212

US Classification:

370347, 455 6711

Abstract:

At a plurality of first devices, wireless transmissions are received at different locations in a region where multiple target devices may be emitting. Identifier data associated with reception of emissions from target devices at multiple first devices is generated. Similar identifier data associated with received emissions at multiple first devices are grouped together into a cluster record that potentially represents the same target device detected by multiple first devices. Data is stored that represents a plurality of cluster records from identifier data associated with received emissions made over time by multiple first devices. The cluster records are analyzed over time to correlate detections of target devices across multiple first devices.

US Patent:

20120280714, Nov 8, 2012

Filed:

Jul 18, 2012

Appl. No.:

13/552093

Inventors:

Matthew Aaron SILVERMAN - Richfield OH, US
Paul Jeffrey Stager - Akron OH, US
Brian Donald Hart - Sunnyvale CA, US

International Classification:

H03K 19/096

US Classification:

326 93

Abstract:

In an example embodiment, a method for synchronizing clocks between a plurality of clocked devices where one of the plurality of clocked devices is not directly synchronized with another of the plurality of clocked devices. Clock offset and a clock drift between a first clock associated with a first device and a second clock associated with a second is directly determined based on signals exchanged between the first and second devices. Clock offset and clock drift between the second clock and a third clock associated with a third device is directly determined based on signals exchanged between the second and third devices. A clock offset and clock drift between the first clock and third clock is determined based on a difference between the clock offset and drift between the first and second clocks and the clock offset and drift between the second and third clocks.

US Patent:

20130010731, Jan 10, 2013

Filed:

Sep 14, 2012

Appl. No.:

13/618299

Inventors:

Neil Robert DIENER - Hudson OH, US
Abhijit Kumar CHOUDHURY - Cupertino CA, US
Brian Donald HART - Sunnyvale CA, US
David S. STEPHENSON - San Jose CA, US

International Classification:

H04W 72/02

US Classification:

370329

Abstract:

In an example embodiment described herein is an apparatus comprising a wireless transceiver and channel selection logic coupled to the wireless transceiver and operable to select an operating frequency for the wireless transceiver. The channel selection logic is configured to reserve a dedicated channel having a special identifier. The channel selection logic is configured to have the wireless transceiver advertise the dedicated service on a normal operating frequency. The channel selection logic is responsive to receiving a request from a wireless device via the wireless transceiver on the normal operating frequency to use the dedicated channel to switch to the dedicated channel and establish communications with the wireless device on the dedicated channel.

US Patent:

20130286863, Oct 31, 2013

Filed:

Apr 30, 2012

Appl. No.:

13/459330

Inventors:

Matthew A. Silverman - Shaker Heights OH, US
Paul J. Stager - Akron OH, US
Brian D. Hart - Sunnyvale CA, US
Mohammad Janani - Plano TX, US
Ahmadreza Hedayat - Allen TX, US

Assignee:

CISCO TECHNOLOGY, INC. - San Jose CA

International Classification:

H04W 24/00
H04W 72/04

US Classification:

370252

Abstract:

Techniques are provided to determine whether or not incident power at a wireless communication device in at least two frequency channels is from the same device. Incident power in frequency channels allocated to a basic service set in a wireless network is received at a plurality of antennas of the wireless communication device. Channel state information is computed for at least two frequency channels allocated to the basic service set. One or more metrics are generated based on the channel state information in the two frequency channels. The one or more metrics are evaluated to characterize an uplink signal bandwidth associated with the two channels to determine whether or not the incident power in the two channels is from the same device.