公开(公告)号：US10218539B2

公开(公告)日：2019-02-26

申请号：US15660905

申请日：2017-07-26

Applicant: Cisco Technology, Inc.

Inventor： David S. Kloper ,  Brian D. Hart ,  Dipankar B. Acharya

IPC: H04L12/64 ,  H04L12/46 ,  H04W16/02 ,  H04W24/02 ,  H04W88/10

Abstract: The present disclosure discloses a distributed system. The distributed system includes a plurality of radio heads and a plurality of controllers disposed in one or more chassis external to the plurality of radio heads. Each of the plurality of controllers includes a baseband unit (BBU), an uplink time-division multiplexing (TDM) switch and a downlink TDM switch. The uplink TDM switch and the downlink TDM switch forward data bits between a radio head and a BBU by using TDM cells which may reduce latency relative to using Ethernet frames.

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：US09942020B1

公开(公告)日：2018-04-10

申请号：US15497558

申请日：2017-04-26

Applicant: Cisco Technology, Inc.

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

IPC: H04B1/10 ,  H04L5/00 ,  H04B7/0413 ,  H04W72/08 ,  H04W72/04

CPC classification number: H04L5/0062 ,  H04B7/0413 ,  H04J11/0036 ,  H04L5/0098 ,  H04L25/03

Abstract: Embodiments herein describe recovering data packets received by a plurality of wireless antennas of a radio head. In one embodiment, the signals received by the radio head are filtered using a single filter to recover at least one data packet. In another embodiment, the signals received by the radio head are filtered using a plurality of filters to recover at least one data packet. In one embodiment, a controller coupled with the radio head filters the received signals and recovers the at least one data packet.

公开(公告)号：US20170150522A1

公开(公告)日：2017-05-25

申请号：US15428370

申请日：2017-02-09

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart

IPC: H04W74/04 ,  H04B17/318

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-Interface 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：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：US20160309537A1

公开(公告)日：2016-10-20

申请号：US14687241

申请日：2015-04-15

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  John Matthew Swartz ,  Joshua Suhr ,  Matthew A. Silverman ,  Tak Ming Pang

IPC: H04W76/02 ,  H04B17/318 ,  H04W24/08

CPC classification number: H04W76/027 ,  H04B17/318 ,  H04W76/18

Abstract: In response to receiving a probe request from a mobile client, an access point determines whether it should suppress a probe response. The access point receives a probe request from a wireless client device, and prepares a probe response to respond to the probe request. The access point determines whether the wireless client device is likely to associate with the wireless access point. Responsive to a determination that the wireless client device is unlikely to associate with the wireless access point, the access point suppresses the transmission of the probe response.

Abstract translation: 响应于从移动客户端接收到探测请求，接入点确定是否应该抑制探测响应。 接入点从无线客户端设备接收探测请求，并准备探测响应以响应探测请求。 接入点确定无线客户端设备是否可能与无线接入点相关联。 响应于无线客户端设备不可能与无线接入点相关联的确定，接入点抑制探测响应的传输。

公开(公告)号：US20160249342A1

公开(公告)日：2016-08-25

申请号：US15141922

申请日：2016-04-29

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart

IPC: H04W72/04 ,  H04L29/06 ,  H04L5/00 ,  H04L29/08 ,  H04W72/12 ,  H04W24/04

CPC classification number: H04W72/048 ,  H04L5/0007 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0028 ,  H04L5/0037 ,  H04L5/0055 ,  H04L5/0064 ,  H04L5/0087 ,  H04L5/0094 ,  H04L69/22 ,  H04L69/323 ,  H04W24/04 ,  H04W72/0453 ,  H04W72/1289 ,  H04W84/12 ,  H04W88/08

Abstract: Techniques are provided herein to allow a wireless network access point (AP) to more fully use its bandwidth in order to leverage the different bandwidth capabilities of different types of wireless client devices that the AP serves. The AP generates control parameters for usage of a plurality of channels in a bandwidth during a downlink transmission interval. The control parameters comprise information indicating channel assignments that result in multiple downlink transmissions that at least partially overlap in time to different wireless client devices according to their respective bandwidth capabilities. The AP transmits the control parameters in a control frame in advance of the downlink transmission interval on each of the plurality of channels in the bandwidth.

Abstract translation: 本文提供技术以允许无线网络接入点（AP）更充分地使用其带宽，以便利用AP服务的不同类型的无线客户端设备的不同带宽能力。 AP在下行链路传输间隔期间产生用于在带宽中使用多个信道的控制参数。 控制参数包括指示根据各自的带宽能力导致至少部分地与不同无线客户端设备重叠的多个下行链路传输的信道分配的信息。 AP在带宽中的多个信道中的每一个上的下行链路传输间隔之前的控制帧中发送控制参数。

公开(公告)号：US20160157225A1

公开(公告)日：2016-06-02

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.

Abstract translation: 分配多个时隙，在该时隙期间为一个或多个目标无线设备执行定位过程。 将选择不同位置的多个无线接入点中的一个分配给每个时隙，使得分配给给定时隙的多个无线接入点被充分分离。 此外，无线接入点被分配给每个时隙的多个组中的相应一个组，使得分配给组乐曲的无线接入点被组中的无线接入点使用的信道发送一个或多个帧， 旨在引起来自一个或多个无线设备的一个或多个响应帧。

公开(公告)号：US20160069978A1

公开(公告)日：2016-03-10

申请号：US14476997

申请日：2014-09-04

Applicant: Cisco Technology, Inc.

Inventor： Raghuram Rangarajan ,  Brian D. Hart

IPC: G01S1/08

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：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。