公开(公告)号：US09521520B2

公开(公告)日：2016-12-13

申请号：US14078824

申请日：2013-11-13

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Paul J. Stager

IPC: G01S19/00 ,  H04B17/00 ,  H04W24/00 ,  H04W4/02 ,  H04W64/00 ,  H04B7/08 ,  G01S5/00 ,  G01S13/87 ,  H04B7/04

CPC classification number: H04W4/023 ,  G01S5/0036 ,  G01S13/878 ,  H04B7/0404 ,  H04B7/086 ,  H04W24/00 ,  H04W64/00

Abstract: A particular first wireless device having a plurality of antennas and that is part of a group of a plurality of first wireless devices, transmits to a second wireless device (whose location is to be determined) a packet across the plurality of antennas of the particular first wireless device simultaneously with a plurality of packets transmitted by a corresponding one of other first wireless devices in the group. The packet transmitted by the particular first wireless device uses a subset of a set of subcarriers available for use in the packet such that substantially the entire set of subcarriers are used in the aggregate across the plurality of packets simultaneously transmitted by the plurality of first wireless devices in the group to the second wireless device. The simultaneous reception of the plurality of packets at the second wireless device enables the second wireless device to determine its location.

Abstract translation: 具有多个天线并且是多个第一无线设备的组的一部分的特定的第一无线设备向特定第一无线设备的多个天线中的分组传送到第二无线设备（其位置将被确定） 无线设备与由组中的其他第一无线设备中的相应一个发送的多个分组同时进行。 由特定第一无线设备发送的分组使用可用于分组中的一组子载波的子集，使得基本上整个子载波集合在由多个第一无线设备同时发送的多个分组之间的集合中使用 在组中到第二个无线设备。 在第二无线设备处同时接收多个分组使得第二无线设备能够确定其位置。

公开(公告)号：US09226184B2

公开(公告)日：2015-12-29

申请号：US13928452

申请日：2013-06-27

Applicant: Cisco Technology, Inc.

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

IPC: H04W24/08 ,  H04B7/04 ,  H04L1/24 ,  H04W24/06 ,  H04L25/03

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0456 ,  H04L1/203 ,  H04L1/24 ,  H04L2025/03426 ,  H04W24/06

Abstract: A first device having a plurality of antennas wirelessly transmits multiple series of test packets to a second device having one or more antennas, each series of test packets being transmitted with a different level of interference imposed on the test packets. The first device determines a packet error rate for each series of test packets transmitted by the first device. The first device derives an estimate of an interference cancellation capability of the second device based on the packet error rate for different levels of interference.

Abstract translation: 具有多个天线的第一设备将具有一个或多个天线的第二设备无线地发射多个测试分组，每一组测试分组以不同的干扰等级施加在测试分组上。 第一设备确定由第一设备发送的每一系列测试分组的分组错误率。 第一设备基于不同级别的干扰的分组错误率导出第二设备的干扰消除能力的估计。

公开(公告)号：US20150131593A1

公开(公告)日：2015-05-14

申请号：US14600300

申请日：2015-01-20

Applicant: Cisco Technology, Inc

Inventor： Paul J. Stager ,  Matthew A. Silverman ,  Zhigang Gao ,  John Blosco ,  Raghuram Rangarajan

IPC: H04W72/08 ,  H04L5/00 ,  H04W72/04

CPC classification number: H04W72/082 ,  H04L5/0073 ,  H04W24/02 ,  H04W72/0426 ,  H04W72/046 ,  H04W84/12 ,  H04W88/08

Abstract: In a wireless local area network, each of multiple access points, in a high density deployment, are configured to suppress co-channel interference. A first access point having a plurality of antennas beamforms a transmission to a wireless client device within a null-space or with the weakest singular eigenmodes of a wireless channel between the first access point and at least one co-channel second access point. Techniques are presented herein for situations in which any given access point has two or more co-channel access points. In addition, an access point may perform receive side suppression with respect to a transmission (made by a co-channel access point to one of its associated wireless client devices) that is received from that co-channel access point.

Abstract translation: 在无线局域网中，高密度部署中的多个接入点中的每一个被配置为抑制同信道干扰。 具有多个天线的第一接入点波束在零空间内或在第一接入点与至少一个同频道第二接入点之间的无线信道的最弱奇异本征模式中形成向无线客户端设备的传输。 本文给出了任何给定接入点具有两个或更多个同频道接入点的情况的技术。 此外，接入点可以针对从该同频道接入点接收到的传输（由与其相关联的无线客户端设备之一的同频道接入点进行的）进行接收侧抑制。

公开(公告)号：US20220377699A1

公开(公告)日：2022-11-24

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 ,  G01S13/76 ,  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：US11412476B2

公开(公告)日：2022-08-09

申请号：US16938551

申请日：2020-07-24

Applicant: Cisco Technology, Inc.

Inventor： Xu Zhang ,  Paul J. Stager ,  Santosh Ghanshyam Pandey ,  Matthew Aaron Silverman ,  Abhishek Mukherji

IPC: H04W64/00 ,  H04W8/02 ,  H04W4/33 ,  H04B17/382 ,  H04W4/02 ,  H04B17/327

Abstract: Offloading of location computation from a location server to an access point through the use of projections on base phase vectors may be provided. First, an Access Point (AP) may receive a set of two or more base phase vectors from a location server. Next, the AP may measure a measured phase vector for a first signal from a user device. Then, the AP can determine projection values based on a comparison of the measured phase vector to each base phase vector. From these comparisons, the AP can determine a subset of base phase vectors with the highest projection values. The AP can then send the projection values and the subset of base phase vectors to the location server, wherein the location server determines the device location from these projection values and subset of base phase vectors.

公开(公告)号：US11150325B2

公开(公告)日：2021-10-19

申请号：US16380668

申请日：2019-04-10

Applicant: Cisco Technology, Inc.

Inventor： Matthew Aaron Silverman ,  Santosh Ghanshyam Pandey ,  Paul J. Stager ,  Xu Zhang ,  Abhishek Mukherji

IPC: G01S5/04 ,  G01S5/02 ,  H04L29/08 ,  H04W88/08

Abstract: Determining a device's location in a space in real time is computing intensive. To offload some of the workload in conducting this hyperlocation, the access points in the network conduct some of process in determining the location of a device. The cloud determines a restricted AoA search area based on previous client locations. After this determination, a three-dimensional (3D) AoA search is conducted by each AP in the restricted area (restricted by a range of azimuth directions) for a device. Finally, each AP reports a location(s) for the device, which comprises weights for selected angular sectors. The cloud can then construct a probability heat map for location computation from the weights provided from each AP for the device.

公开(公告)号：US11133583B2

公开(公告)日：2021-09-28

申请号：US16420485

申请日：2019-05-23

Applicant: Cisco Technology, Inc.

Inventor： Stephen J. McCarthy ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H01Q3/00 ,  H01Q3/24 ,  H01Q21/00 ,  H04B7/06 ,  H04B7/08

Abstract: An apparatus comprises an antenna array, a block of switches, a programmable logic device and a memory device. The antenna array comprises a plurality of antenna elements. The block of switches is configured to selectively connect respective ones of a subset of the plurality of antenna elements to corresponding ones of a plurality of transceivers in a host device. The programmable logic device is configured to communicate with the host device and to control the block of switches. The memory device is coupled to the programmable logic device, and is configured to store information allowing the host device to determine how to control connectivity of individual antenna elements to respective ones of the plurality of transceivers of the host device as part of transmit and/or receive operations of the host device.

公开(公告)号：US11024961B2

公开(公告)日：2021-06-01

申请号：US16875655

申请日：2020-05-15

Applicant: Cisco Technology, Inc.

Inventor： Fred J. Anderson ,  Danielle N. Bane ,  John M. Blosco ,  Paul J. Stager ,  Daniel N. Johnson ,  Timothy A. Frank ,  John M. Swartz

IPC: H04B7/0413 ,  H01Q3/36 ,  H04B7/06

Abstract: An electronically a steerable and switchable antenna array is provided that can produce a first beam with a first coverage range and a second beam with a second coverage range by selecting one of a first and a second beamwidth for both the first and second beams; in response to selecting the first beamwidth: switching signal inputs to narrow-beam antenna arrays; steering the first beam to one of a first positive, negative, or zero offset position; independently steering the second beam to one of a second positive, negative offset, or zero offset position; and transmitting signals received from the signal inputs via the first beam and the second beam; and in response to selecting the second beamwidth: switching signal inputs to wide-beam antenna arrays; and transmitting signals received from the signal inputs via the first beam and the second beam.

公开(公告)号：US20190280380A1

公开(公告)日：2019-09-12

申请号：US16420485

申请日：2019-05-23

Applicant: Cisco Technology, Inc.

Inventor： Stephen J. McCarthy ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H01Q3/24

Abstract: An apparatus comprises an antenna array, a block of switches, a programmable logic device and a memory device. The antenna array comprises a plurality of antenna elements. The block of switches is configured to selectively connect respective ones of a subset of the plurality of antenna elements to corresponding ones of a plurality of transceivers in a host device. The programmable logic device is configured to communicate with the host device and to control the block of switches. The memory device is coupled to the programmable logic device, and is configured to store information allowing the host device to determine how to control connectivity of individual antenna elements to respective ones of the plurality of transceivers of the host device as part of transmit and/or receive operations of the host device.

公开(公告)号：US10278155B1

公开(公告)日：2019-04-30

申请号：US15875043

申请日：2018-01-19

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Zhigang Gao ,  John Matthew Swartz ,  Paul J. Stager

IPC: H04W64/00 ,  H04W24/08

Abstract: A plurality of first wireless devices monitor a ranging exchange of transmissions between a target wireless device and a second wireless device in order to record for each of the plurality of first wireless devices a time of reception of a first transmission that is sent from the second wireless device to the target wireless device and a time of reception of a second transmission that is sent from the target wireless device to the second wireless device. Using a timing error computed from the estimated location, a modification is made of the time of transmission of the first transmission to produce a first modified timestamp and of the time of reception of the second transmission to produce a second modified timestamp. A ranging measurement is computed of the target wireless device relative to the second wireless device using the first modified timestamp and the second modified timestamp.