公开(公告)号：US11659445B2

公开(公告)日：2023-05-23

申请号：US17443596

申请日：2021-07-27

Applicant: Cisco Technology, Inc.

Inventor： Ardalan Alizadeh ,  Gautam D. Bhanage ,  Sivadeep R. Kalavakuru ,  Pooya Monajemi ,  Matthew A. Silverman

IPC: H04W28/08 ,  H04W28/16

CPC classification number: H04W28/0975 ,  H04W28/0804 ,  H04W28/0835 ,  H04W28/0908 ,  H04W28/16

Abstract: Techniques for distributed computation are provided. A plurality of edge computing devices available to execute a computing task for a client device is identified, and a first latency of transmitting data among the plurality of edge computing devices is determined. A second latency of transmitting data from the client device to the plurality of edge computing devices is determined, and a set of edge computing devices, from the plurality of edge computing devices, is determined to execute the computing task based at least in part on the first and second latencies. Execution of the computing task is facilitated using the set of edge computing devices, where the client device transmits a portion of the computing task directly to each edge computing device of the set of edge computing devices.

公开(公告)号：US11513181B2

公开(公告)日：2022-11-29

申请号：US16939614

申请日：2020-07-27

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Silverman

IPC: G01S3/38 ,  H04W64/00 ,  G01S3/48 ,  G01S1/68

Abstract: In one embodiment, a method includes receiving a plurality of radio frequency chains at a wireless device in a block based modulation environment, recording subcarrier phases and differences between the subcarrier phases, and using the subcarrier phase differences to construct a feature vector for use in angle of arrival calculated positioning of a mobile device.

公开(公告)号：US11412502B2

公开(公告)日：2022-08-09

申请号：US16810671

申请日：2020-03-05

Applicant: Cisco Technology, Inc.

Inventor： Pooya Monajemi ,  Matthew A. Silverman ,  Gautam D. Bhanage ,  Paul J. Stager ,  Fred J. Anderson

IPC: H04W72/04

Abstract: Techniques for efficient network probing are provided. Coherence data is received from a plurality of access points (APs), where the coherence data indicates, for each respective AP of the plurality of APs, coherence bandwidth for a plurality of subcarriers. A mapping is generated indicating, for each of the plurality of APs, sets of subcarriers that can be interchangeably sounded. Two or more APs of the plurality of APs that can jointly sound a first subcarrier of the plurality of subcarriers are then identified based on the mapping, and the first subcarrier is allocated to the identified two or more APs for future sounding.

公开(公告)号：US10944603B2

公开(公告)日：2021-03-09

申请号：US15982257

申请日：2018-05-17

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Amir H. Kamalizad ,  Jie C. Jiang

IPC: H04L27/00 ,  H04W76/11 ,  H04W48/16 ,  H04W48/10 ,  H04L25/03 ,  H04W84/18

Abstract: Modulated radio frequency (RF) packets are received from a wireless device, and converted to modulated baseband packets. Baseband parameters are derived from the modulated baseband packets. A baseband profile including the baseband parameters is created for the wireless device. A database including baseband profiles of wireless devices is accessed. The baseband profiles are classified under known device types based on baseband parameters included in the baseband profiles. The baseband parameters of the baseband profile are compared to corresponding baseband parameters of the baseband profiles in the database. If the comparing indicates a match between the baseband profile and one of the baseband profiles, the wireless device is classified under the known device type of the one of the baseband profiles, and the baseband profile is stored in the database under the known device type.

公开(公告)号：US10904831B2

公开(公告)日：2021-01-26

申请号：US16406184

申请日：2019-05-08

Applicant: Cisco Technology, Inc.

Inventor： Ardalan Alizadeh ,  Amir Hosein Kamalizad ,  Khashayar Mirfakhraei ,  Xu Zhang ,  Matthew A. Silverman

IPC: H04L5/00 ,  H04W52/02 ,  H04L25/02

Abstract: In one embodiment, a device in a network receives, at its wireless receiver, a preamble of a spatially modulated packet. The device analyzes the preamble of the packet to identify a transmit antenna index of the packet. The device determines that the packet was not destined for the device, based on the transmit antenna index of the packet. The device depowers, prior to decoding the complete packet, the wireless receiver of the device, based on the determination that the packet was not destined for the device.

公开(公告)号：US20190356520A1

公开(公告)日：2019-11-21

申请号：US15982257

申请日：2018-05-17

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Amir H. Kamalizad ,  Jie C. Jiang

IPC: H04L27/00 ,  H04W76/11 ,  H04L25/03 ,  H04W48/16 ,  H04W48/10

Abstract: Modulated radio frequency (RF) packets are received from a wireless device, and converted to modulated baseband packets. Baseband parameters are derived from the modulated baseband packets. A baseband profile including the baseband parameters is created for the wireless device. A database including baseband profiles of wireless devices is accessed. The baseband profiles are classified under known device types based on baseband parameters included in the baseband profiles. The baseband parameters of the baseband profile are compared to corresponding baseband parameters of the baseband profiles in the database. If the comparing indicates a match between the baseband profile and one of the baseband profiles, the wireless device is classified under the known device type of the one of the baseband profiles, and the baseband profile is stored in the database under the known device type.

公开(公告)号：US10340975B2

公开(公告)日：2019-07-02

申请号：US15379726

申请日：2016-12-15

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Paul J. Stager ,  John Blosco ,  Corey D. Metsker

IPC: H04W88/08 ,  H04B1/525 ,  H04B1/10 ,  H04W84/12

Abstract: Receiving filter design that reduces out-of-channel interference for APs is disclosed. An AP includes a first radio and a second radio disposed in a body of the AP. The first radio transmits first signals in a frequency band while the second radio receives second signals in the same frequency band. The AP includes an interference mitigation controller that determines a receiving filter for the second radio to mitigate interference between the first radio and the second radio based on the second signals received by the second radio when the first radio transmits the first signals in the frequency band. The interference mitigation controller applies the receiving filter to signals received by the second radio during a time period that the first radio is transmitting signals in the frequency band while the second radio is receiving signals in the frequency band.

公开(公告)号：US10306675B2

公开(公告)日：2019-05-28

申请号：US15585400

申请日：2017-05-03

Applicant: Cisco Technology, Inc.

Inventor： David Kloper ,  Brian D. Hart ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04W74/08 ,  H04W74/00 ,  H04L1/00 ,  H04W88/08

Abstract: A central processor subsystem controls multiple transceivers. Each transceiver transmits protocol data units from antennas of that transceiver and produces receive waveforms from wirelessly received signals at the one or more antennas. A transmit waveform, including a frame addressed to one or more wireless client devices, is sent through a first transceiver to be transmitted wirelessly by the first transceiver on a frequency channel. A receive waveform, representative of the transmission by the first transceiver and wirelessly received at a second transceiver, is received from the second transceiver. While the transmit waveform is being sent to the first transceiver: a level of collision between the receive waveform and another transmission on the frequency channel is detected; and if the level of collision exceeds a threshold prior to an end of the receive waveform, the transmit waveform being sent to the first transceiver is modified to reduce the collision.

公开(公告)号：US20190137596A1

公开(公告)日：2019-05-09

申请号：US15808105

申请日：2017-11-09

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Oscar Bejarano Chavez ,  Paul J. Stager ,  David Kloper

IPC: G01S5/06 ,  H04L25/02

CPC classification number: G01S5/06 ,  H04B7/0802 ,  H04B7/0871 ,  H04L25/0224

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.

公开(公告)号：US09823330B2

公开(公告)日：2017-11-21

申请号：US13886533

申请日：2013-05-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Silverman

IPC: G01S3/38 ,  G01S3/48 ,  H04W64/00 ,  G01S1/68

CPC classification number: G01S3/38 ,  G01S1/68 ,  G01S3/48 ,  H04W64/006

Abstract: In one embodiment, an apparatus includes a plurality of antennas, a receiver in communication with said plurality of antennas for receiving one or more packets in a block based modulation environment, a switch interposed between a portion of the antennas and the receiver for switching between the antennas, and a processor for calculating angle of arrival for use in identifying a location of a mobile device transmitting the one or more packets.