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1. 发明授权

US11122594B2 Distributed overlapping basic service set scheduling techniques for increased spectral efficiency 有权
公开(公告)号：US11122594B2
公开(公告)日：2021-09-14
申请号：US16512251
申请日：2019-07-15
申请人： Cisco Technology, Inc.
发明人： Gautam D. Bhanage , Brian D. Hart , David S. Kloper
IPC分类号： H04W72/12 , H04W88/08 , H04W80/08 , H04W72/04
摘要： Techniques for triggering multiple basic service sets (BSSs) to share resources for a coordinated transmission are described. One technique includes determining a first amount of data available to send in a first BSS and determining a second amount of data available to send in a second BSS. The first BSS and the second BSS form an overlapping BSS. An amount of resources in the first BSS that is available to share with the second BSS for a coordinated transmission from the first BSS and the second BSS is determined based on the first amount of data and the second amount of data. A frame that includes an indication of the amount of resources is generated and transmitted to at least one of the first BSS and the second BSS.

2. 发明授权

US10367550B2 Updating precoding matrix for MIMO transmissions 有权
公开(公告)号：US10367550B2
公开(公告)日：2019-07-30
申请号：US15477620
申请日：2017-04-03
申请人： Cisco Technology, Inc.
发明人： David S. Kloper , Mithat C. Dogan , Matthew A. Silverman , Brian D. Hart , Jiunming Huang
IPC分类号： H04B7/0426 , H04B7/0452
摘要： The present disclosure discloses that a device uses precoding to transmit independent data streams to existing users and additional independent data streams to one or more new users simultaneously. During a first transmission of a first one or more data streams that are precoded using a first precoding matrix, the device determines to transmit a second one or more data streams in a second transmission. Before the first transmission is complete, the device calculates a combined precoding matrix for precoding the first one or more data streams and the second one or more data streams. The device transmits the first one or more data streams in the first transmission and the second one or more data streams in the second transmission simultaneously using the combined precoding matrix.

3. 发明授权

US10326538B2 Remote radio head reciprocity calibration 有权
公开(公告)号：US10326538B2
公开(公告)日：2019-06-18
申请号：US15480197
申请日：2017-04-05
申请人： Cisco Technology, Inc.
发明人： Mithat C. Dogan , Jiunming Huang , Brian D. Hart , Matthew A. Silverman
IPC分类号： H04B7/06 , H04B17/12 , H04B17/14 , H04B17/21 , H01Q3/26 , H04B7/024 , H04B7/0417 , H04L25/02 , H04L5/14
摘要： 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. 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.

4. 发明授权

US10256997B2 Computing transmit and receive filters for a network device 有权
公开(公告)号：US10256997B2
公开(公告)日：2019-04-09
申请号：US15381630
申请日：2016-12-16
申请人： Cisco Technology, Inc.
发明人： Mithat C. Dogan , Brian D. Hart , Jiunming Huang , Matthew Silverman
IPC分类号： H04L25/02 , H04L25/03 , H04B7/0413 , H04W84/12 , H04W88/12
摘要： 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.

5. 发明授权

US10218416B2 MU-MIMO grouping system 有权
公开(公告)号：US10218416B2
公开(公告)日：2019-02-26
申请号：US15431539
申请日：2017-02-13
申请人： Cisco Technology, Inc.
发明人： Matthew A. Silverman , Paul J. Stager , David S. Kloper , Brian D. Hart , Qing Zhao
IPC分类号： H04B7/04 , H04B7/0452 , H04L12/26 , H04L12/24
摘要： 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.

6. 发明授权

US09999034B2 Uplink multi-user-MIMO without client assistance 有权
公开(公告)号：US09999034B2
公开(公告)日：2018-06-12
申请号：US15407565
申请日：2017-01-17
申请人： Cisco Technology, Inc.
发明人： Brian D. Hart , Matthew A. Silverman , Paul J. Stager , David Kloper
IPC分类号： H04B7/02 , H04B7/04 , H04L5/00 , H04W72/04 , H04B7/0452 , H04B7/06 , H04W84/12
CPC分类号： H04W72/0413 , H04B7/0452 , H04B7/0626 , H04L1/18 , H04L5/0048 , H04W72/042 , H04W84/12
摘要： 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.

7. 发明授权

US09668149B1 Receiver stomp-and-restart in a distributed MU-MIMO system using RSSI separation 有权
公开(公告)号：US09668149B1
公开(公告)日：2017-05-30
申请号：US15163915
申请日：2016-05-25
申请人： Cisco Technology, Inc.
发明人： Paul J. Stager , Matthew A. Silverman , Brian D. Hart , David Kloper
IPC分类号： H04B7/10 , H04W24/02 , H04W74/08 , H04L12/26 , H04L25/03 , H04B7/0452
CPC分类号： H04B7/0885 , H04B1/1036 , H04B7/024 , H04B7/0452 , H04L25/03 , H04L43/16 , H04W88/085
摘要： 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.

8. 发明授权

US09648615B2 Location measurement optimized off-channel scanning and grouping of access points 有权
公开(公告)号：US09648615B2
公开(公告)日：2017-05-09
申请号：US14558200
申请日：2014-12-02
申请人： Cisco Technology, Inc.
发明人： Shaunak Joshi , Paul J. Stager , Brian D. Hart , Santosh Pandey , Matthew A. Silverman
IPC分类号： H04W72/04 , H04W64/00 , H04W4/02
CPC分类号： H04W72/0446 , H04W4/02 , H04W64/00
摘要： 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.

9. 发明授权

US09258713B2 Rogue wireless beacon device detection 有权
标题翻译：流氓无线信标设备检测
公开(公告)号：US09258713B2
公开(公告)日：2016-02-09
申请号：US14278555
申请日：2014-05-15
申请人： Cisco Technology, Inc.
发明人： Raghuram Rangarajan , Brian D. Hart , Sujai Hajela , Santosh Pandey , David Kloper , Greg Corsetto , Allen J. Huotari
IPC分类号： H04L9/32 , H04W12/08 , H04W64/00
CPC分类号： H04W12/08 , H04W4/80 , H04W12/12 , H04W64/003
摘要： 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.
摘要翻译：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。

10. 发明申请

US20140241240A1 Distributed Processing Distributed-Input Distributed-Output (DIDO) Wireless Communication 有权
标题翻译：分布式处理分布式输入分布式输出（DIDO）无线通信
公开(公告)号：US20140241240A1
公开(公告)日：2014-08-28
申请号：US13780513
申请日：2013-02-28
申请人： CISCO TECHNOLOGY, INC.
发明人： David Kloper , Brian D. Hart , Paul J. Stager , Matthew A. Silverman
IPC分类号： H04W16/28
CPC分类号： H04W16/28 , H04B7/024
摘要： 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.
摘要翻译：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。

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