公开(公告)号：US20140154992A1

公开(公告)日：2014-06-05

申请号：US13691912

申请日：2012-12-03

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Matthew A. Silverman ,  Jeffrey R. Adams ,  David Kloper ,  Yanxin Na ,  Narayan Vishwanathan ,  Daniel Wee

IPC: H04W16/28

CPC classification number: H04W16/28 ,  H04B7/0626 ,  H04B7/0634

Abstract: A channel sounding scheme is presented herein that relies on a combination of a first channel sounding procedure and a second channel sounding procedure. The first channel sounding technique is one that involves an exchange of dedicated channel sounding related signals to determine channel conditions between the first wireless communication device and the particular second wireless communication device. The second channel sounding technique is one in which channel conditions are implicitly discovered from any signals transmitted by the particular second wireless communication device to the first wireless communication device. A first wireless communication device computes updates to steering matrix information used for beamforming one or more signal streams to a particular second wireless communication device based on a combination of the first channel sounding technique and the second channel sounding technique.

Abstract translation: 此处呈现依赖于第一声道探测程序和第二声道探测程序的组合的声道探测方案。 第一通道探测技术是涉及专用信道探测相关信号的交换以确定第一无线通信设备和特定第二无线通信设备之间的信道状况的技术。 第二信道探测技术是从特定的第二无线通信设备向第一无线通信设备发送的任何信号隐含地发现信道条件的方法。 第一无线通信设备基于第一信道探测技术和第二信道探测技术的组合，计算用于将一个或多个信号流波束成形到特定第二无线通信设备的导引矩阵信息的更新。

公开(公告)号：US20210226989A1

公开(公告)日：2021-07-22

申请号：US17223323

申请日：2021-04-06

Applicant: Cisco Technology, Inc.

Inventor： Gautam Bhanage ,  David Kloper ,  Brian Hart

IPC: H04L29/06 ,  H04W12/00

Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.

公开(公告)号：US11012469B2

公开(公告)日：2021-05-18

申请号：US16253329

申请日：2019-01-22

Applicant: Cisco Technology, Inc.

Inventor： Gautam Bhanage ,  David Kloper ,  Brian Hart

IPC: H04L29/06 ,  H04W12/00 ,  H04W84/12

Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.

公开(公告)号：US10952156B2

公开(公告)日：2021-03-16

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 ,  H04W36/30 ,  H04B17/318 ,  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：US20210067283A1

公开(公告)日：2021-03-04

申请号：US16804428

申请日：2020-02-28

Applicant: Cisco Technology, Inc.

Inventor： Brian Hart ,  David Kloper

IPC: H04L5/00 ,  H04W72/04

Abstract: Presented herein is a tone plan that can accommodate multiple bandwidth options. This tone plan may be designed around a fundamental tile, such as 20 MHz tile, that is replicated to 40 and 80 MHz (and 160 MHz and beyond). For wider bandwidths, the otherwise-unused guard tones between the 20 MHz tiles are filled by a new resource unit and DC tones. There are DC tones placed to support any client, for all defined and plausible future values of its current operating bandwidth and center frequency (i.e. any 20 MHz, any 40 MHz, any 80 MHz, 160 MHz and 80+80 MHz, 320, 160+80 etc.), as well as plausible future preamble puncturing cases.

公开(公告)号：US10761177B2

公开(公告)日：2020-09-01

申请号：US15725054

申请日：2017-10-04

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian Donald Hart ,  Paul J. Stager ,  Santosh Pandey ,  David Kloper ,  Dan Lyons ,  Matthew A. Sliverman

IPC: G01S3/38 ,  H04W64/00 ,  G01S3/48 ,  G01S1/68

Abstract: In one embodiment, an apparatus includes a processor for processing a plurality of radio frequency chains at a wireless device in a block based modulation environment, recording subcarrier phases and differences between the subcarrier phases, and using the subcarrier phase differences to construct a feature vector for use in angle of arrival calculated positioning of a mobile device, and memory for storing the subcarrier phases and the feature vector.

公开(公告)号：US10735033B2

公开(公告)日：2020-08-04

申请号：US16171503

申请日：2018-10-26

Applicant: Cisco Technology, Inc.

Inventor： Fred J. Anderson ,  Paul J. Stager ,  John M. Blosco ,  Qing Zhao ,  David Kloper

IPC: H04B1/00 ,  H04B1/10

Abstract: A wireless communication device is built from a base module and a plurality of front-end modules. Each of the plurality of front-end modules is configured to operate a different one of a plurality of radio frequency services and having a front-end module connector configured to removeably mate with a base module connector of the base module. A particular front-end module is connected to the base module. Upon connection of the particular front-end module to the base module connector, the base module reads information from a memory of the particular front-end module to determine the radio service that the particular front-end module is configured to operate and to supply the control signals to configure and control front-end circuitry of the front-end module to operate the radio service.

公开(公告)号：US20200236134A1

公开(公告)日：2020-07-23

申请号：US16253329

申请日：2019-01-22

Applicant: Cisco Technology, Inc.

Inventor： Gautam Bhanage ,  David Kloper ,  Brian Hart

IPC: H04L29/06 ,  H04W12/00

Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.

公开(公告)号：US20200229086A1

公开(公告)日：2020-07-16

申请号：US16246879

申请日：2019-01-14

Applicant: Cisco Technology, Inc.

Inventor： Pooya Monajemi ,  Gautam Bhanage ,  David Kloper ,  Young Il Choi ,  Vishal Satyendra Desai ,  Santosh Bahaji Kulkarni

IPC: H04W52/02 ,  H04W72/12

Abstract: In one embodiment, a first wireless access point (AP) of a first basic service set (BSS) receives, from a second wireless AP of a second BSS, data indicative of an 802.11-based target wake time (TWT) schedule of a client of the second BSS. The first wireless AP identifies, from the receive data, a scheduled communication time of the client of the second BSS in the TWT schedule. The first wireless AP generates an 802.11-based TWT schedule for a client of the first BSS that avoids the scheduled communication time of the client of the second BSS. The first wireless AP sends the generated 802.11-based TWT schedule to the client of the first BSS, wherein the sent TWT schedule causes the client of the first BSS to wake from sleep at a scheduled wake time.

公开(公告)号：US10677885B2

公开(公告)日：2020-06-09

申请号：US16390566

申请日：2019-04-22

Applicant: Cisco Technology, Inc.

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

IPC: G01S5/06 ,  H04L25/02 ,  H04B7/08

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.