公开(公告)号：US20180176044A1

公开(公告)日：2018-06-21

申请号：US15381630

申请日：2016-12-16

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Brian D. Hart ,  Jiunming Huang ,  Matthew Silverman

IPC: H04L25/02 ,  H04B7/0452 ,  H04B7/06

CPC classification number: H04L25/0246 ,  H04B7/0413 ,  H04L25/0204 ,  H04L25/0244 ,  H04L25/03159

Abstract: The embodiments herein use a factorization based technique for determining filter coefficients for a subset of the subcarriers in a wireless frequency band. Once the filter coefficients for the subset of the subcarriers are calculated, the network device uses these filter coefficients to identify the filter coefficients in a neighboring subcarrier. To do so, the network device uses pseudo-inverse iteration to convert the already calculated filter coefficients into filter coefficients for a neighboring subcarrier. The network device can repeat this process for the next set of neighboring subcarriers until all the filter coefficients have been calculated.

公开(公告)号：US09991972B1

公开(公告)日：2018-06-05

申请号：US15497969

申请日：2017-04-26

Applicant: Cisco Technology, Inc.

Inventor： Mithat C. Dogan ,  Matthew A. Silverman ,  Paul J. Stager ,  Brian D. Hart ,  Jiunming Huang

IPC: H04B15/00 ,  H04B17/12 ,  H04L25/02 ,  H04B7/06 ,  H04B7/0413

CPC classification number: H04B17/12 ,  H04B7/022 ,  H04B7/0617 ,  H04L25/0202

Abstract: Embodiments herein describe calibrating a plurality of radio heads having a plurality of wireless antennas. In one embodiment, the plurality of radio heads communicate a calibration signal in a round robin fashion such that each of the radio heads communicates a respective calibration signal to the remaining radio heads. In one embodiment, at least one of the radio heads is isolated from the remaining radio heads. The received calibration signals are then used to calibrate the radio heads. In one embodiment, a controller coupled with the plurality of radio heads calibrates the radio heads. The calibrated radio heads then communicate to one or more client devices.

公开(公告)号：US09929792B2

公开(公告)日：2018-03-27

申请号：US15496056

申请日：2017-04-25

Applicant: Cisco Technology, Inc.

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

IPC: H04B1/00 ,  H04B7/08 ,  H04W88/08 ,  H04B7/0452 ,  H04B1/10

CPC classification number: H04B7/0885 ,  H04B1/1036 ,  H04B7/024 ,  H04B7/0452 ,  H04L25/03 ,  H04L43/16 ,  H04W88/085

Abstract: A system and method are provided for performing stomp-and-restart techniques in distributed MU-MIMO system. A plurality of radio head devices are provided that are configured to be deployed separated from each other in a coverage region of interest of a wireless network. A central processor subsystem is provided that is in communication with the plurality of radio head devices. The central processor subsystem configured to perform several operations based on downconverted samples received from the plurality of radio head devices.

公开(公告)号：US20180034517A1

公开(公告)日：2018-02-01

申请号：US15220701

申请日：2016-07-27

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Paul J. Stager ,  David Kloper ,  Jie Cheng Jiang

IPC: H04B7/04 ,  H04W72/04

CPC classification number: H04B7/0452 ,  H04B7/024 ,  H04W84/12 ,  H04W88/08

Abstract: A wireless access point device wirelessly communicates with a plurality of wireless client devices. The wireless access point includes a central processor subsystem and a plurality of transceiver devices each including a plurality of antennas, and a plurality of radio transceivers, each of the plurality of transceiver devices configured for deployment throughout a coverage area, each transceiver device being connected to the central processor subsystem via a respective cable. The central processor subsystem distributes in-phase and quadrature baseband samples across the plurality of transceiver devices associated with traffic to be transmitted and received via the plurality of transceiver devices in one or more frequency bands so as to synthesize a wideband multiple-input multiple-output transmission channel and a wideband multiple-input multiple-output reception channel. The access point transmit and receive functions are “split” or partitioned across the plurality of transceivers devices.

公开(公告)号：US09706514B2

公开(公告)日：2017-07-11

申请号：US14558205

申请日：2014-12-02

Applicant: Cisco Technology, Inc.

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

IPC: H04W24/00 ,  H04W64/00 ,  G01S5/02 ,  G01S5/04 ,  H04W84/12

CPC classification number: H04W64/00 ,  G01S5/0226 ,  G01S5/0273 ,  G01S5/04 ,  H04W84/12

Abstract: Techniques are presented herein for improving location determination of a wireless device in environments where there can be multipath issues. A wireless device having a plurality of antennas receives a wireless transmission from a target device whose location is to be determined. Channel state information data is generated based on reception of the transmission at the plurality of antenna. The channel state information data is separated or partitioned into subcarrier group specific data for each of a plurality of groups of subcarriers within a bandwidth of the received transmission. Location probability data is computed for each of the plurality of groups of subcarriers from the subcarrier group specific data for respective ones of the plurality of groups of subcarriers. The location probability data for the plurality of groups of subcarriers is combined to produce aggregate location probability data, from which a location of the target device is determined.

公开(公告)号：US20170127407A1

公开(公告)日：2017-05-04

申请号：US15407565

申请日：2017-01-17

Applicant: Cisco Technology, Inc.

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

IPC: H04W72/04 ,  H04B7/06 ,  H04B7/0452

CPC classification number: H04W72/0413 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/18 ,  H04L5/0048 ,  H04W72/042 ,  H04W84/12

Abstract: A method is provided in which a first wireless access point selects two or more of a plurality of client devices based on similarity of receive signal strength and carrier frequency offset with respect to the first wireless access point, and sends a downlink multi-user multiple-input multiple-output (MIMO) transmission to the two or more client devices. The downlink multi-user MIMO transmission is configured to solicit acknowledgments from the two or more client devices. The acknowledgments are received at a plurality of antennas of the first wireless access point from the two or more client devices. Uplink multi-user MIMO processing of the acknowledgments is performed from the two or more of the plurality of client devices to recover the acknowledgments respectively from each of the two or more client devices.

公开(公告)号：US09629181B1

公开(公告)日：2017-04-18

申请号：US14656760

申请日：2015-03-13

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart

IPC: H04L12/28 ,  H04W74/04

CPC classification number: H04B17/318 ,  H04B17/345 ,  H04B17/373 ,  H04W52/223 ,  H04W52/242 ,  H04W74/0808 ,  H04W84/12

Abstract: A pair of Clear Channel Assessment (CCA) rules are presented that protect an initiator's transmission at the responder, and the responder's transmission at the initiator, using additional fields transmitted in a preamble (header) of a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) or in a Media Access Control (MAC) header, if unencrypted and robustly modulated. These techniques enable more parallel/simultaneous transmissions between devices that might otherwise interfere with each other, subject to ensuring an adequate Signal-to-Interference and-Noise Ratio (SINR) for the initiator's transmission at the responder and ensuring an adequate SINR for the responder's transmission at the initiator.

公开(公告)号：US09584278B2

公开(公告)日：2017-02-28

申请号：US14796001

申请日：2015-07-10

Applicant: Cisco Technology, Inc.

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

IPC: H04B7/02 ,  H04L5/00 ,  H04W72/04 ,  H04B7/04

CPC classification number: H04W72/0413 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/18 ,  H04L5/0048 ,  H04W72/042 ,  H04W84/12

Abstract: In accordance with an embodiment, a method is provided in which a first wireless access point sends a downlink multi-user multiple-input multiple-output (MIMO) transmission to a plurality of client devices. The downlink multi-user MIMO transmission is configured to solicit acknowledgments from two or more of the plurality of client devices. The acknowledgments are received at a plurality of antennas of the first wireless access point from the two or more of the plurality of client devices. Uplink multi-user MIMO processing of the acknowledgments is performed from the two or more of the plurality of client devices to recover the acknowledgments respectively from each of the two or more of the plurality of client devices.

Abstract translation: 根据实施例，提供了一种方法，其中第一无线接入点向多个客户端设备发送下行链路多用户多输入多输出（MIMO）传输。 下行链路多用户MIMO传输被配置为从多个客户端设备中的两个或多个客户端设备请求确认。 在多个客户端设备中的两个或更多个的第一无线接入点的多个天线处接收确认。 从多个客户端设备中的两个或多个客户机设备执行确认的上行链路多用户MIMO处理，以分别从多个客户端设备中的两个或多个客户机设备中的每一个恢复确认。

公开(公告)号：US09551775B2

公开(公告)日：2017-01-24

申请号：US14476997

申请日：2014-09-04

Applicant: Cisco Technology, Inc.

Inventor： Raghuram Rangarajan ,  Brian D. Hart

IPC: H04W24/00 ,  G01S1/08 ,  G01S5/02 ,  H04W84/12 ,  H04W4/00 ,  H04W4/02

CPC classification number: G01S1/08 ,  G01S5/0226 ,  G01S5/0252 ,  H04W4/02 ,  H04W4/80 ,  H04W84/12

Abstract: A computing entity, such as a server, obtains a first, second, and third set of measurements based on wireless transmissions between one or more beacon devices, a wireless client device, and one or more wireless access points in a wireless network. The first set of measurements is associated with wireless transmissions from the beacon device(s) received at the wireless access points. The second set of measurements is associated with wireless transmissions between the wireless client device and the wireless access points. The third set of measurements is associated with wireless transmissions from beacon devices received at the wireless client device. An estimated location of the wireless client device is generated based on the first set of measurement data, the second set of measurement data, and the third set of measurement data.

Abstract translation: 诸如服务器的计算实体基于无线网络中的一个或多个信标设备，无线客户端设备和一个或多个无线接入点之间的无线传输来获得第一，第二和第三测量集合。 第一组测量与来自在无线接入点处接收的信标设备的无线传输相关联。 第二组测量与无线客户端设备和无线接入点之间的无线传输相关联。 第三组测量与在无线客户端设备处接收的信标设备的无线传输相关联。 基于第一组测量数据，第二组测量数据和第三组测量数据来生成无线客户端设备的估计位置。

公开(公告)号：US09408036B2

公开(公告)日：2016-08-02

申请号：US14278546

申请日：2014-05-15

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Raghuram Rangarajan ,  Sujai Hajela ,  Gregory H. Yamanishi ,  Gracia Wang ,  Allen J. Huotari

IPC: H04W24/00 ,  H04W4/02 ,  H04W4/00 ,  H04W64/00 ,  H04L29/06

CPC classification number: H04W4/029 ,  H04L69/22 ,  H04W4/02 ,  H04W4/80 ,  H04W64/00 ,  H04W64/003

Abstract: Wireless transmissions from beacon devices are received at a plurality of receiver devices. The wireless transmissions comprise packets that carry information used for location-based services for mobile wireless devices. Content of one or more fields of the beacon packets received by one or more of the plurality of receiver devices is obtained. Measurement data associated with the transmissions received at the plurality of receiver devices is generated. Locations of the respective beacon devices are computed from the measurement data obtained by the plurality of receiver devices. Information identifying detected beacon devices and their locations are stored to maintain a location history of beacon devices over time locations. Changes from information contained in the location history are detected based on the locations computed for respective beacon devices from the measurement data and content of one or more fields of detected beacon packets.

Abstract translation: 在多个接收机设备处接收来自信标设备的无线传输。 无线传输包括携带用于移动无线设备的基于位置的服务的信息的分组。 获得由多个接收机设备中的一个或多个接收的信标分组的一个或多个字段的内容。 产生与在多个接收机设备处接收的传输相关联的测量数据。 根据由多个接收机设备获得的测量数据计算各个信标设备的位置。 识别检测到的信标设备及其位置的信息被存储以维持随着时间位置的信标设备的位置历史。 基于从测量数据和检测到的信标分组的一个或多个字段的内容的各个信标设备计算的位置来检测位置历史中包含的信息的变化。