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公开(公告)号：US10568134B2
公开(公告)日：2020-02-18
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
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.
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公开(公告)号：US20200029361A1
公开(公告)日：2020-01-23
申请号：US16037287
申请日：2018-07-17
Applicant: Cisco Technology, Inc.
Inventor： Vishal S. Desai , Brian D. Hart , David Kloper , Andrew Myles
Abstract: In a wireless local area network (WLAN) that includes one or more wireless access points capable of serving one or more wireless clients, presence of one or more instances of interference from a particular type of interferer is detected on at least one channel in an unlicensed frequency band. In response to detecting the interference, a radio resource management process is biased to continue operation of at least one of the one or more access points, or individual radios of a multi-radio access point, on the channel to make at least some use of the channel for one or more wireless clients.
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23.发明申请公开(公告)号：US20190242970A1
公开(公告)日：2019-08-08
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
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.
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公开(公告)号：US09929792B2
公开(公告)日：2018-03-27
申请号：US15496056
申请日：2017-04-25
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , Matthew A. Silverman , Brian D. Hart , David Kloper
IPC: H04B1/00 , H04B7/08 , H04W88/08 , H04B7/0452 , H04B1/10
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.
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25.发明申请公开(公告)号：US20180034517A1
公开(公告)日：2018-02-01
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
CPC classification number: 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.
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Patent Agency Ranking
公开(公告)号：US20170127407A1
公开(公告)日：2017-05-04
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: H04W72/04 , H04B7/06 , H04B7/0452
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.
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公开(公告)号：US09584278B2
公开(公告)日：2017-02-28
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
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。
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公开(公告)号：US09143370B2
公开(公告)日：2015-09-22
申请号：US14037807
申请日：2013-09-26
Applicant: Cisco Technology, Inc.
Inventor： Zhigang Gao , Raghuram Rangarajan , David Kloper
CPC classification number: H04L25/063
Abstract: Techniques are presented herein for distinguishing between the DC component of a real signal and DC energy of a received signal due to the radio receiver circuitry. Samples are obtained of a received signal derived from output of a receiver of a communication device. A mean of the samples is computed over a sample window comprising a predetermined number of samples. First and second thresholds are provided, the first threshold being greater than the second threshold. An absolute value of the mean is compared with respect to the first threshold and the second threshold as samples are obtained in the sample window. A selection is made between the first threshold and the second threshold for purposes of comparison with the absolute value of the mean to determine whether energy at DC is a true/real DC component of the received signal or is due to circuitry of the receiver.
Abstract translation: 这里给出了用于区分由无线电接收器电路引起的实际信号的DC分量和接收信号的DC能量之间的技术。 获得从通信设备的接收机的输出得到的接收信号的样本。 在包含预定数量的样本的样本窗口上计算样本的平均值。 提供第一和第二阈值，第一阈值大于第二阈值。 将平均值的绝对值相对于第一阈值和第二阈值进行比较，因为样本窗口中获取样本。 在第一阈值和第二阈值之间进行选择，以便与平均值的绝对值进行比较，以确定DC处的能量是否是接收信号的真实/真实DC分量，或者是由于接收机的电路。
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29.发明授权公开(公告)号：US11601469B2
公开(公告)日：2023-03-07
申请号：US17223323
申请日：2021-04-06
Applicant: Cisco Technology, Inc.
Inventor： Gautam Bhanage , David Kloper , Brian Hart
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.
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公开(公告)号：US20220070773A1
公开(公告)日：2022-03-03
申请号：US17522774
申请日：2021-11-09
Applicant: Cisco Technology, Inc.
Inventor： Pooya Monajemi , Gautam Bhanage , David Kloper , Young Il Choi , Vishal Satyendra Desai , Santosh Bahaji Kulkarni
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.
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