公开(公告)号：US20240072955A1

公开(公告)日：2024-02-29

申请号：US17820404

申请日：2022-08-17

Applicant: Cisco Technology, Inc.

Inventor： Mohsen Jamalabdollahi ,  Ardalan Alizadeh ,  Audrey Yazdanparast ,  Matthew Aaron Silverman

IPC: H04L5/00 ,  H04W56/00

CPC classification number: H04L5/0044 ,  H04L5/0053 ,  H04L5/0007 ,  H04W56/001

Abstract: Legacy preamble puncturing for fine timing and frequency offset estimation may be provided. Within a user information field of a trigger frame, a legacy preamble puncturing pattern may be allocated to each of a plurality of client devices wherein each of the plurality of client devices is allocated with at least one respective corresponding non-overlapping sub-channel. Next, from each of the plurality of client devices on their respective corresponding non-overlapping sub-channel, a respective corresponding preamble may be received. Time and frequency synchronization may then be performed for each of the plurality of client devices based on their respective corresponding preamble.

公开(公告)号：US11838830B2

公开(公告)日：2023-12-05

申请号：US18075631

申请日：2022-12-06

Applicant: Cisco Technology, Inc.

Inventor： Robert Edgar Barton ,  Jerome Henry ,  Matthew Aaron Silverman

IPC: H04W4/02 ,  H04B1/7163 ,  H04W72/56

CPC classification number: H04W4/023 ,  H04B1/7163 ,  H04W72/56

Abstract: Presented herein are techniques for scheduling Ultra-Wideband (UWB) anchors and mobile devices for client ranging. A control device can determine respective ranging priorities for a plurality of mobile devices, which are each assigned to at least one UWB anchor. The control device can obtain at least one collision mapping identifying, for a respective pair of the mobile devices, a collision probability that a UWB signal associated with a ranging procedure involving a first mobile device of the respective pair will collide with a UWB signal associated with a ranging procedure involving a second mobile device of the respective pair. The control device can establish a ranging schedule for the mobile devices and UWB anchors based on the respective UWB ranging priorities and the collision mapping(s). The control device can send at least one command to cause UWB ranging procedures to be performed according to the ranging schedule.

公开(公告)号：US11812373B2

公开(公告)日：2023-11-07

申请号：US18057902

申请日：2022-11-22

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Ardalan Alizadeh ,  Khashayar Mirfakhraei ,  Gautam D. Bhanage

IPC: H04W4/00 ,  H04W48/16 ,  H04W48/20 ,  H04W72/20 ,  H04W84/12 ,  H04W88/08

CPC classification number: H04W48/16 ,  H04W48/20 ,  H04W72/20 ,  H04W84/12 ,  H04W88/08

Abstract: Optimal determination of a Wireless Local Area Network (WLAN) sounding method and system may be provided. An Access Point (AP) selects a subchannel for the partial sounding. The AP then sounds the selected subchannel. A client station responds with Channel State Information (CSI). The AP can receive the CSI, from the client station, in response to the sounding. Based on the CSI from the selected subchannel, the AP extrapolates the CSI to determine predicted CSI for a wider bandwidth channel.

公开(公告)号：US11758508B2

公开(公告)日：2023-09-12

申请号：US17833824

申请日：2022-06-06

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Xu Zhang ,  Santosh Ghanshyam Pandey ,  Jerome Henry ,  Paul J. Stager

IPC: H04W64/00 ,  H04W16/28 ,  G01S13/76

CPC classification number: H04W64/003 ,  G01S13/762 ,  H04W16/28

Abstract: Access Point (AP) placement using Fine Time Measurement (FTM) may be provided. First, a plurality of Time-of-Flight (ToF) values between a first service end point and a second service end point may be determined. Each one of the plurality of ToF values may be derived from packets transmitted via different beamforming vector patterns at the first service end point and the second service end point. Then a minimum ToF value of the plurality of ToF values may be determined. Next, a distance between the first service end point and the second service end point may be determined based on the minimum ToF value.

公开(公告)号：US11729740B2

公开(公告)日：2023-08-15

申请号：US17815284

申请日：2022-07-27

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Matthew Aaron Silverman ,  Mukul Chandail ,  Manoj Gupta ,  Swapnil Devendrakumar Shah ,  Vishal Satyendra Desai

IPC: H04W64/00 ,  H04B17/318 ,  H04W4/029 ,  H04W8/00 ,  H04W48/16 ,  H04L101/622 ,  H04W84/12

CPC classification number: H04W64/003 ,  H04B17/318 ,  H04W4/029 ,  H04W8/005 ,  H04W48/16 ,  H04L2101/622 ,  H04W84/12

Abstract: A method and system for providing location services at a network edge is described. An AP can receive location information associated with a second AP in a location group. The AP can also receive client location data from the second AP and associated with a first client. From at least the received client location data, the AP can determine a location of the first client. The AP can then send the location of the first client to a location service.

公开(公告)号：US20230239012A1

公开(公告)日：2023-07-27

申请号：US17989262

申请日：2022-11-17

Applicant: Cisco Technology, Inc.

Inventor： John Matthew Swartz ,  Nagendra Kumar Nainar ,  Matthew Aaron Silverman

IPC: H04B7/0452 ,  H04B7/0426 ,  H04B17/327 ,  H04B17/336

CPC classification number: H04B7/0452 ,  H04B7/0426 ,  H04B17/327 ,  H04B17/336

Abstract: Presented herein are techniques to shield transmissions from being received and the information contained in them recovered by unwanted devices. Multi-user multiple-input multiple-output (MU-MIMO) techniques are employed, and in particular the spatial dimension aspects of those techniques. Shield nodes are controlled to transmit in a way to obscure the downlink streams transmitted by a wireless access point that are intended for a particular client device to anything outside of the shielded area, and also to obscure uplink streams from one or more client devices to the wireless access point to anything outside of the shielded area but allowing the uplink streams to be well received by the wireless access point.

公开(公告)号：US20230126483A1

公开(公告)日：2023-04-27

申请号：US17512098

申请日：2021-10-27

Applicant: Cisco Technology, Inc.

Inventor： Fred J. Anderson ,  Paul Jeffrey Stager ,  Evgeny Yankevich ,  Matthew Aaron Silverman

IPC: H04W72/08 ,  H04W72/04 ,  G01S7/02

Abstract: Methods and systems for distinguishing between radar signals and Wi-Fi signals are provided. When a set of electromagnetic signals are received, various tests are performed on the signals to determine if the signals are associated with radar pulses or if the signals are more likely to be associated with stray WI-Fi signals or other non-radar interference. One such test relies on the relatively small variance of frequencies used by radar pulses when compared to the high variation of Wi-Fi signals. Another test relies on the relatively low peak to average power ratio of signals associated with radar pulses when compared to Wi-Fi signals. The tests described herein are an improvement on existing methods for distinguishing radar signals from Wi-Fi signals and result in less switching of Wi-Fi channels due to erroneously detected radar signals.

公开(公告)号：US11533698B2

公开(公告)日：2022-12-20

申请号：US17124020

申请日：2020-12-16

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Jerome Henry ,  Robert Edgar Barton

IPC: H04W64/00 ,  H04B1/69

Abstract: A computer-implemented method includes first collecting, from wireless devices at known locations in a venue, first ultra wideband (UWB) location measurements obtained using a first location technique based on first UWB transmissions made by a mobile device at a first rate. The method also includes second collecting, from the wireless devices, second UWB location measurements obtained using a second location technique based on second UWB transmissions made by the mobile device at a second rate. The method further includes detecting that the mobile device is in a first UWB coverage hole for the venue with respect to the first UWB location measurements based on a first UWB coverage hole criterion. The method also includes, based on detecting, increasing the second rate relative to the first rate to obtain additional second UWB location measurements using the second location technique to compensate for the first UWB coverage hole.

公开(公告)号：US11457330B2

公开(公告)日：2022-09-27

申请号：US17125144

申请日：2020-12-17

Applicant: Cisco Technology, Inc.

Inventor： Jerome Henry ,  Robert Edgar Barton ,  Matthew Aaron Silverman

IPC: H04W4/02 ,  H04W74/08 ,  H04B1/7163

Abstract: Presented herein are techniques for assigning Ultra-Wideband (UWB) anchors for client ranging. A control device can monitor UWB ranging between a mobile device and a primary anchor. In response to determining that a signal strength between the mobile device and the primary anchor is below a threshold, the control device can identify anchors for which the mobile device has had a signal strength above the threshold during a period of time, and select one of the anchors as a new primary anchor for the mobile device. For example, the control device can select the new primary anchor based on a relative collision tolerance mapping for the new primary anchor and at least one other anchor within a UWB range of the new primary anchor. The control device can send a command causing UWB ranging to be performed between the mobile device and the new primary anchor.

公开(公告)号：US11445467B2

公开(公告)日：2022-09-13

申请号：US17167979

申请日：2021-02-04

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Matthew Aaron Silverman ,  Mukul Chandail ,  Manoj Gupta ,  Swapnil Devendrakumar Shah ,  Vishal Satyendra Desai

IPC: H04W64/00 ,  H04W4/029 ,  H04W8/00 ,  H04B17/318 ,  H04W48/16 ,  H04L101/622 ,  H04W84/12

Abstract: A method and system for providing location services at a network edge is described. An AP can receive location information associated with a second AP in a location group. The AP can also receive client location data from the second AP and associated with a first client. From at least the received client location data, the AP can determine a location of the first client. The AP can then send the location of the first client to a location service.