公开(公告)号：US10218416B2

公开(公告)日：2019-02-26

申请号：US15431539

申请日：2017-02-13

Applicant: Cisco Technology, Inc.

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

IPC: H04B7/04 ,  H04B7/0452 ,  H04L12/26 ,  H04L12/24

Abstract: Embodiments herein describe a network device (e.g., an access point) that dynamically arranges multi-user (MU) multiple input multiple output (MIMO) compatible client devices into MU-MIMO groups. That is, the network device uses network metrics and historical data to change the assignment of client devices in the MU-MIMO groups which may improve MU-MIMO efficiency by reducing the amount of power that leaks between the clients devices in the group. In one embodiment, the AP identifies a MU-MIMO group based on a performance evaluation such as evaluating network metric or determining if the group is underutilized. The AP can replace the identified MU-MIMO group with a substitute MU-MIMO group where the substitute MU-MIMO group is selected based on historical data corresponding to the client devices assigned to the substitute MU-MIMO group.

公开(公告)号：US10070354B2

公开(公告)日：2018-09-04

申请号：US14967483

申请日：2015-12-14

Applicant: Cisco Technology, Inc.

Inventor： John Martin Blosco ,  Matthew Aaron Silverman ,  John Matthew Swartz ,  Joshua David Suhr ,  Paul J. Stager

IPC: H04W36/06 ,  H04L1/00 ,  H04W24/08 ,  H04W28/04 ,  H04W36/04 ,  H04W36/30 ,  H04L12/26 ,  H04L12/24 ,  H04W36/00 ,  H04W84/12

Abstract: Noise floor degradation detection may be provided. First, an incremental packet loss rate for a secondary radio may be calculated that indicates an impact on packet reception on the secondary radio due to transmissions by a primary radio. The secondary radio and the primary radio may comprise an access point. Next, it may be determined that the incremental packet loss rate is greater than a predetermined value. A configuration of the access point may be changed in response to determining that the incremental packet loss rate is greater than the predetermined value.

公开(公告)号：US09999034B2

公开(公告)日：2018-06-12

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: H04B7/02 ,  H04B7/04 ,  H04L5/00 ,  H04W72/04 ,  H04B7/0452 ,  H04B7/06 ,  H04W84/12

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：US20180034151A1

公开(公告)日：2018-02-01

申请号：US15220711

申请日：2016-07-27

Applicant: Cisco Technology, Inc.

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

IPC: H01Q3/24 ,  H04W72/04 ,  H04L29/08

CPC classification number: H01Q3/24 ,  H01Q3/247 ,  H01Q21/00 ,  H04B7/0691 ,  H04B7/0874

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：US09668149B1

公开(公告)日：2017-05-30

申请号：US15163915

申请日：2016-05-25

Applicant: Cisco Technology, Inc.

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

IPC: H04B7/10 ,  H04W24/02 ,  H04W74/08 ,  H04L12/26 ,  H04L25/03 ,  H04B7/0452

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：US09648615B2

公开(公告)日：2017-05-09

申请号：US14558200

申请日：2014-12-02

Applicant: Cisco Technology, Inc.

Inventor： Shaunak Joshi ,  Paul J. Stager ,  Brian D. Hart ,  Santosh Pandey ,  Matthew A. Silverman

IPC: H04W72/04 ,  H04W64/00 ,  H04W4/02

CPC classification number: H04W72/0446 ,  H04W4/02 ,  H04W64/00

Abstract: A plurality of time slots are allocated during which a location procedure is performed for one or more target wireless devices. Select ones of a plurality of wireless access points at different positions are assigned to each time slot such that multiple wireless access points assigned to a given time slot are sufficiently separated. In addition, wireless access points are assigned to a corresponding one of a plurality of groups for each time slot such that wireless access points assigned to a group tune to a channel used by a wireless access point in the group that transmits one or more frames that are intended to provoke one or more response frames from the one or more wireless devices.

公开(公告)号：US20160037459A1

公开(公告)日：2016-02-04

申请号：US14446993

申请日：2014-07-30

Applicant: Cisco Technology, Inc.

Inventor： John Matthew Swartz ,  Joshua Suhr ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04W52/24 ,  H04W52/22

CPC classification number: H04W52/241 ,  H04W52/143 ,  H04W52/223 ,  H04W52/242 ,  H04W52/245 ,  H04W52/40 ,  H04W52/50 ,  H04W84/12

Abstract: Apparatus and techniques are presented for estimating a noise floor experienced by a client device seeking to associate with an access point in a wireless network. A path loss between the client device and the access point may be estimated. A metric may then be generated, where the metric estimates a strength of a signal transmitted from the access point as received at the client device. The transmit power at the access point may then be adjusted, based on the metric.

Abstract translation: 呈现装置和技术，用于估计寻求与无线网络中的接入点相关联的客户机设备经历的噪声基底。 可以估计客户端设备和接入点之间的路径损耗。 然后可以生成度量，其中度量估计在客户端设备处接收到的从接入点发送的信号的强度。 然后可以基于度量来调整接入点处的发射功率。

公开(公告)号：US20150264614A1

公开(公告)日：2015-09-17

申请号：US14449763

申请日：2014-08-01

Applicant: Cisco Technology, Inc.

Inventor： Paul J. Stager ,  Tak Ming Pang ,  Evgeny Yankevich ,  Arnab Sengupta

IPC: H04W36/18 ,  H04W36/32 ,  H04W36/00 ,  H04W36/30

CPC classification number: H04W36/18 ,  H04W36/0061 ,  H04W36/0083 ,  H04W36/0088 ,  H04W36/30 ,  H04W36/32 ,  H04W48/16 ,  H04W84/005

Abstract: Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.

Abstract translation: 接入点和诸如工作组桥的无线客户端设备被配置为优化用于诸如高速列车的高速车辆场景的客户端设备的漫游算法。 生成静态/动态邻居列表，用于提高扫描效率。 提供改进的父接入点选择过程，度量和阈值以优化沿着车辆路径（例如，列车轨道）的客户端漫游。

公开(公告)号：US20140241240A1

公开(公告)日：2014-08-28

申请号：US13780513

申请日：2013-02-28

Applicant: CISCO TECHNOLOGY, INC.

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

IPC: H04W16/28

CPC classification number: H04W16/28 ,  H04B7/024

Abstract: Techniques are presented for distributed processing Distributed-Input Distributed-Output (DIDO) wireless communication. A plurality of base stations (e.g., APs) are provided, each configured to wirelessly serve one or more wireless devices (e.g., clients). At least first and second base stations are configured to transmit simultaneously at an agreed upon time. The first and second base stations are each configured to locally generate steering matrix information used to spatially precode their respective data transmissions in order to steer their respective data transmissions to their one or more wireless devices while nulling to the one or more client devices of the other base station. Moreover, the first and second base stations are each configured to locally generate a transmit waveform by applying the steering matrix information to their respective data transmissions.

Abstract translation: 提出了分布式处理分布式输入分布式输出（DIDO）无线通信的技术。 提供了多个基站（例如，AP），每个基站被配置为无线地服务于一个或多个无线设备（例如，客户端）。 至少第一和第二基站被配置为在商定的时间同时传输。 第一和第二基站各自被配置为本地生成用于对其各自的数据传输进行空间预编码的导向矩阵信息，以便将它们各自的数据传输转向其一个或多个无线设备，同时使另一个或多个无线设备的一个或多个客户端设备归零 基站。 此外，第一和第二基站各自被配置为通过将导引矩阵信息应用于它们各自的数据传输来本地生成发送波形。

公开(公告)号：US20140098681A1

公开(公告)日：2014-04-10

申请号：US13645565

申请日：2012-10-05

Applicant: CISCO TECHNOLOGY, INC.

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

IPC: H04B15/00 ,  H04W24/00 ,  H04W84/12

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

Abstract: In a wireless local are 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: 在无线本地是网络中，以高密度部署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。