公开(公告)号：US20230034115A1

公开(公告)日：2023-02-02

申请号：US17444008

申请日：2021-07-29

Applicant: Cisco Technology, Inc.

Inventor： Brian D. HART ,  Ardalan ALIZADEH ,  Daniel J. LYONS ,  Matthew A. SILVERMAN

IPC: H04W56/00 ,  H04L27/26

Abstract: Aspects discussed herein include a method and associated network device and computer program product. The method includes receiving a network packet, and estimating, using a preamble of the network packet, a power distribution corresponding to a plurality of subcarriers of a channel. The method further includes estimating a carrier frequency offset using the power distribution, and estimating a clock offset using the carrier frequency offset.

公开(公告)号：US20220417873A1

公开(公告)日：2022-12-29

申请号：US17305032

申请日：2021-06-29

Applicant: Cisco Technology, Inc.

Inventor： Gautam D. BHANAGE ,  Matthew A. SILVERMAN ,  Sivadeep R. KALAVAKURU ,  Ardalan ALIZADEH

IPC: H04W56/00 ,  H04W8/00 ,  H04W16/14 ,  H04W72/12

Abstract: Techniques for neighborhood management between WiFi and unlicensed spectrum radios. A wireless access point (AP), including a first radio, identifies a neighboring second radio operating using at least a portion of an unlicensed radio spectrum, based on a time that the AP receives a transmission from the second radio using a frequency within the unlicensed radio spectrum. Transmission between the first radio and the second radio is synchronized by identifying a clock offset between a first clock relating to the first radio and a second clock relating to the second radio.

公开(公告)号：US20210282107A1

公开(公告)日：2021-09-09

申请号：US16812004

申请日：2020-03-06

Applicant: Cisco Technology, Inc.

Inventor： Jerome HENRY ,  Matthew A. SILVERMAN ,  John M. SWARTZ ,  Vishal S. DESAI ,  Robert E. BARTON

IPC: H04W64/00 ,  G01S13/74

Abstract: Coordinated radio fine time measurement is provided via sending, from a client device, a ranging request to a first radio; receiving a first response sent at a first time from the first radio over a first channel; receiving a second response sent at the first time from a second radio over a second channel; and calculating, based on times of flight for the first response and the second response, a location of the client device relative to the first radio and to the second radio. Coordinated radio fine time measurement is also proved via in response to receiving, at an Access Point (AP), a ranging request from a client device and determining to respond using multiple channels: sending, both at a first time, a first response from a first radio over a first channel a second response from a second radio over a different channel.

公开(公告)号：US20190246368A1

公开(公告)日：2019-08-08

申请号：US16388571

申请日：2019-04-18

Applicant: Cisco Technology, Inc.

Inventor： Paul J. STAGER ,  David S. KLOPER ,  Brian D. HART ,  Matthew A. SILVERMAN

IPC: H04W56/00

CPC classification number: H04W56/0015

Abstract: Techniques are disclosed to synchronize wireless signal transmission by endpoints controlled by a central controller. For example, an example method of wireless communication includes receiving, at a first device, over a wired medium between the first device and a second device, a plurality of packets from the second device. Each of the plurality of packets comprises data representative of a portion of a signal corresponding to a wireless medium. The method further includes receiving, at the first device, from the second device over the wired medium a synchronization signal based on a common master clock at the second device. The method further includes synchronizing, at the first device, a local clock of the first device to the common master clock based on the synchronization signal. The method further includes reconstructing the signal corresponding to the wireless medium based on the plurality of packets and the synchronized local clock.

公开(公告)号：US20180175895A1

公开(公告)日：2018-06-21

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

CPC classification number: H04B1/525 ,  H04B1/1036 ,  H04W84/12 ,  H04W88/08

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：US20250126596A1

公开(公告)日：2025-04-17

申请号：US18828949

申请日：2024-09-09

Applicant: Cisco Technology, Inc.

Inventor： Jerome HENRY ,  Matthew A. SILVERMAN ,  Robert E. BARTON ,  Peiman AMINI ,  Ardalan ALIZADEH

IPC: H04W64/00 ,  H04B1/7163 ,  H04W24/02

Abstract: Techniques and apparatus for configuring ultra-wideband (UWB) communications using out-of-band (OOB) mechanisms are described. An example technique performed by a wireless device includes obtaining, prior to association with an access point (AP), ultra-wideband (UWB) information from the AP via an out-of-band (OOB) communication link between the wireless device and the AP. A location server within a network including the wireless device and the AP is determined based on the UWB information. Configuration information associated with a UWB ranging session from the location server is obtained via the OOB communication link. The UWB ranging session is performed in accordance with the configuration information.

公开(公告)号：US20240381414A1

公开(公告)日：2024-11-14

申请号：US18452448

申请日：2023-08-18

Applicant: Cisco Technology, Inc.

Inventor： Malcolm M. SMITH ,  Matthew A. SILVERMAN ,  Robert E. BARTON

IPC: H04W74/02 ,  H04W72/542 ,  H04W74/04 ,  H04W74/08

Abstract: Techniques for resource unit (RU) allocation for wireless communication are disclosed. These techniques include identifying a first allocation of scheduled access (SA) and random access (RA) RUs for uplink from one or more wireless stations (STAs) to a wireless access point (AP) in a wireless local area network (WLAN). The techniques further include measuring one or more performance characteristics for the one or more STAs, determining a second allocation of uplink SA and RA RUs in the WLAN based on the measured one or more performance characteristics, and advertising the second allocation of uplink SA and RARUs to the one or more STAs.

公开(公告)号：US20240334225A1

公开(公告)日：2024-10-03

申请号：US18194614

申请日：2023-03-31

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. SILVERMAN ,  John M. SWARTZ ,  Malcolm M. SMITH ,  Brian D. HART

IPC: H04W24/10 ,  H04B7/0456 ,  H04L5/00 ,  H04W48/16

CPC classification number: H04W24/10 ,  H04B7/0456 ,  H04L5/005 ,  H04W48/16

Abstract: Techniques for sounding for wireless communication are disclosed. These techniques include initiating staggered sounding between a plurality of wireless access points (APs) and a plurality of wireless stations (STAs), including transmitting, from each AP of the plurality of APs, a sounding trigger to a respective one or more of the plurality of STAs, where the sounding triggers are transmitted by the respective APs at staggered times. The techniques further include receiving sounding matrix data at the plurality of APs from the plurality of STA. The techniques further include modifying wireless transmission between at least one of the APs and at least one of the STAs based on the sounding matrix data.

公开(公告)号：US20240186697A1

公开(公告)日：2024-06-06

申请号：US18061421

申请日：2022-12-02

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep R. KALAVAKURU ,  Navid POURRAMZANGANDJI ,  Ardalan ALIZADEH ,  Matthew A. SILVERMAN ,  Fred J. ANDERSON

IPC: H01Q3/36 ,  H01Q1/22 ,  H01Q1/48 ,  H01Q9/04

CPC classification number: H01Q3/36 ,  H01Q1/2291 ,  H01Q1/48 ,  H01Q9/045

Abstract: A wireless access point system is provided that includes at least one of a beamforming module adapted to set a resonant impedance value of impedance tuning elements of a first sub-array, wherein respective antenna elements of the first sub-array resonate at a first frequency, the beamforming module further adapted to set a non-resonant impedance value of the impedance tuning elements of a second sub-array for suppressing antenna element resonance at the first frequency, thereby configuring the array to provide a beamformed wireless communication signal; or a beamsteering module adapted to set the resonant impedance value for the impedance tuning elements of the first sub-array and set the non-resonant impedance value for the impedance tuning elements of the second sub-array for steering the beamformed wireless communication signal.

公开(公告)号：US20240015727A1

公开(公告)日：2024-01-11

申请号：US18192306

申请日：2023-03-29

Applicant: Cisco Technology, Inc.

Inventor： Pascal THUBERT ,  Jerome HENRY ,  Juan Carlos ZUNIGA ,  Matthew A. SILVERMAN ,  Domenico FICARA ,  Amine CHOUKIR ,  Robert E. BARTON

IPC: H04W72/121 ,  H04W72/20 ,  H04W72/0446

CPC classification number: H04W72/121 ,  H04W72/20 ,  H04W72/0446 ,  H04W84/12

Abstract: Techniques for managing communications between access points and stations (STAs) are described herein. An access point broadcasts a trigger message to a plurality of STAs, the trigger message includes a matrix defining a plurality of resource units (RUs) that the plurality of STAs are assigned to transmit or receive data. The matrix accomplishes time division multiplexing by assigning timeslots to a plurality of STAs. The matrix accomplishes frequency division multiplexing by also assigning frequency tones to the plurality of STAs.