公开(公告)号：US20200374810A1

公开(公告)日：2020-11-26

申请号：US16421175

申请日：2019-05-23

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  David Kloper ,  Pooya Monajemi ,  Vishal S. Dasai

IPC: H04W52/24 ,  H04W52/14 ,  H04W24/10 ,  H04W52/34

Abstract: Augmenting a neighbor report with uplink Received Signal Strength Indicators (RSSIs) may be provided. First, a conducted transmit power value of a client device may be determined. A plurality of RSSI uplink values respectively corresponding to a plurality of Access Points (APs) may then be determined. Next, a plurality of RSSI downlink values respectively corresponding to the plurality of APs may be determined based on the respective plurality of RSSI uplink values, a respective plurality of conducted transmit power values corresponding to the plurality of APs, and the conducted transmit power value of the client device. A plurality of quality metrics respectively corresponding to the plurality of APs may then be determined based on the determined plurality of RSSI uplink values and the determined plurality of RSSI downlink values. Then, a neighbor report may be optimized based on the plurality of quality metrics.

公开(公告)号：US20200280950A1

公开(公告)日：2020-09-03

申请号：US16290135

申请日：2019-03-01

Applicant: Cisco Technology, Inc.

Inventor： Gautam Dilip Bhanage ,  Pooya Monajemi ,  David Kloper

IPC: H04W64/00 ,  H04W52/02 ,  H04W8/00

Abstract: Presented herein are methodologies for setting a target wake time for a wireless client that is being served by an access point, wherein the access point also performs scanning for locating the wireless client. The methodology includes determining a start time of a time window for scanning, e.g., for locations of respective wireless clients, setting a target wake time of a given wireless client, among the wireless clients, based on the start time of the time window for scanning respective wireless clients, and wirelessly communicating the target wake time to the given wireless client.

公开(公告)号：US10330770B2

公开(公告)日：2019-06-25

申请号：US15808105

申请日：2017-11-09

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Oscar Bejarano Chavez ,  Paul J. Stager ,  David Kloper

IPC: H04B1/44 ,  G01S5/06 ,  H04L25/02

Abstract: Techniques are presented herein for computing angle-of-arrival estimates while switching antenna states during a packet unit for the general Orthogonal Frequency Division Multiple Access (OFMDA) case (including a single user). A wireless device computes channel estimates throughout the entire frame and not only during the training symbols. Consequently, the wireless device computes channel estimates for all antennas in its array within a single frame instead of having to wait for multiple frames.

公开(公告)号：US10312979B2

公开(公告)日：2019-06-04

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: H04W72/04 ,  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：US20180343674A1

公开(公告)日：2018-11-29

申请号：US16037480

申请日：2018-07-17

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  David Kloper ,  Pooya Monajemi ,  Matthew A. Silverman

IPC: H04W74/08 ,  H04W72/04 ,  H04W52/46 ,  H04L1/00 ,  H04W52/24 ,  H04W52/22 ,  H04L5/00 ,  H04W52/36

CPC classification number: H04W74/08 ,  H04L1/00 ,  H04L5/0055 ,  H04W52/228 ,  H04W52/245 ,  H04W52/367 ,  H04W52/46 ,  H04W72/0473 ,  H04W74/0808

Abstract: A third device stores a receive signal strength of a received response data unit transmitted by a second device after receiving a first data unit transmitted by a first device. The third device obtains a clear channel access parameter included in a header of a second data unit transmitted by the first device to the second device and detects transmission exchanges in each of a plurality of service sets to use as samples of overlapping service set activity. The third device determines a minimum transmit power to be used by the third device to send a transmission to the fourth device based on transmission exchanges between devices in a particular service set. The third device determines whether to send a transmission to the fourth device based on the clear channel access parameter and minimum transmit power.

公开(公告)号：US09794810B1

公开(公告)日：2017-10-17

申请号：US13943425

申请日：2013-07-16

Applicant: Cisco Technology, Inc.

Inventor： David Kloper ,  Julan Hsu ,  Hari Narayanan Rangarajan ,  Paul Stager

IPC: H04W24/08

CPC classification number: H04W24/08 ,  H04W24/10

Abstract: In an example embodiment disclosed herein there is described a multi-radio device which comprises a first radio that first radio comprises a transmitter, and a second radio that second radio comprises a receiver that monitors a channel to obtain data representative of a predefined channel parameter. The second radio is operable to receive a signal from the first radio that indicates when the transmitter of the first radio is transmitting. The receiver of the second radio selectively excludes data representative of a predefined channel parameter based on whether the transmitter of the first radio is transmitting.

公开(公告)号：US20170012752A1

公开(公告)日：2017-01-12

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: H04L5/00 ,  H04B7/04 ,  H04W72/04

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：US09544041B2

公开(公告)日：2017-01-10

申请号：US13973496

申请日：2013-08-22

Applicant: Cisco Technology, Inc.

Inventor： Raghuram Rangarajan ,  David Kloper ,  Paul J. Stager

IPC: H04M1/00 ,  H04B7/08 ,  H03G3/30

CPC classification number: H04B7/0817 ,  H03G3/3078

Abstract: A set of receiver path circuits is allocated for processing a radio-frequency (RF) signal provided by receive antennas coupled to the receiver path circuits. The RF signal may belong to a first signal class, such as Wi-Fi. A first gain control signal is applied to each of the allocated receiver path circuits to condition a signal level of the RF signal for the first signal class. A second gain control signal is applied to another set of receiver path circuits coupled to the receive antennas to condition the RF signal of a second signal class. First receive gain control signals are generated from the RF signals of the first signal class by the allocated set of the receiver path circuits. The first receive gain control signals are configured to optimize the signal level for processing the first signal class. A second receive gain control signal is generated to optimize the signal level of the RF signal for the second signal class.

Abstract translation: 分配一组接收机路径电路来处理由耦合到接收机路径电路的接收天线提供的射频（RF）信号。 RF信号可以属于第一信号类，例如Wi-Fi。 对每个分配的接收机路径电路施加第一增益控制信号，以便调节第一信号类的RF信号的信号电平。 第二增益控制信号被施加到耦合到接收天线的另一组接收器路径电路以调节第二信号类的RF信号。 第一接收增益控制信号由所分配的一组接收机路径电路从第一信号类的RF信号产生。 第一接收增益控制信号被配置为优化用于处理第一信号类的信号电平。 生成第二接收增益控制信号以优化第二信号类的RF信号的信号电平。

公开(公告)号：US09241275B2

公开(公告)日：2016-01-19

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 ,  H04B7/02

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：US20150334569A1

公开(公告)日：2015-11-19

申请号：US14278555

申请日：2014-05-15

Applicant: Cisco Technology, Inc.

Inventor： Raghuram Rangarajan ,  Brian D. Hart ,  Sujai Hajela ,  Santosh Pandey ,  David Kloper ,  Greg Corsetto ,  Allen J. Huotari

IPC: H04W12/08 ,  H04W64/00

CPC classification number: H04W12/08 ,  H04W4/80 ,  H04W12/12 ,  H04W64/003

Abstract: Techniques are presented for detecting rogue wireless beacon devices. Wireless transmissions from beacon devices are received at a plurality of receiver devices. The wireless transmissions of the beacon devices comprise packets that carry information used for location-based services for mobile wireless devices. Content of one or more fields of the packets transmitted by the beacon devices and received by one or more of the receiver devices is obtained. The content of one or more fields of the packets is analyzed to detect an unauthorized beacon device. The analyzing operation may involve comparing the content of the one or more fields of the packets against a list that contains one or more identifiers for authorized beacon devices. In another form, analyzing may involve analyzing the content of the one or more fields of the packets with pattern information related to advertising content or advertising source.

Abstract translation: 提供了用于检测流氓无线信标设备的技术。 在多个接收机设备处接收来自信标设备的无线传输。 信标设备的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。 获得由信标设备发送并由一个或多个接收机设备接收的分组的一个或多个字段的内容。 分析分组的一个或多个字段的内容以检测未经授权的信标设备。 分析操作可以包括将分组的一个或多个字段的内容与包含用于授权信标设备的一个或多个标识符的列表进行比较。 在另一种形式中，分析可以包括利用与广告内容或广告源相关联的模式信息来分析分组的一个或多个字段的内容。