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41.发明授权公开(公告)号：US10863465B2
公开(公告)日：2020-12-08
申请号：US16388571
申请日：2019-04-18
Applicant: Cisco Technology, Inc.
Inventor： Paul J. Stager , David S. Kloper , Brian D. Hart , Matthew A. Silverman
IPC: H04W56/00
Abstract: Techniques are disclosed to synchronize wireless signal transmission by endpoints controlled by a central controller. For example, an example method of wireless communication includes receiving, at a first device, over a wired medium between the first device and a second device, a plurality of packets from the second device. Each of the plurality of packets comprises data representative of a portion of a signal corresponding to a wireless medium. The method further includes receiving, at the first device, from the second device over the wired medium a synchronization signal based on a common master clock at the second device. The method further includes synchronizing, at the first device, a local clock of the first device to the common master clock based on the synchronization signal. The method further includes reconstructing the signal corresponding to the wireless medium based on the plurality of packets and the synchronized local clock.
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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：US10455439B2
公开(公告)日：2019-10-22
申请号：US15495503
申请日：2017-04-24
Applicant: Cisco Technology, Inc.
Inventor： David S. Kloper , Matthew A. Silverman , Paul J. Stager
Abstract: The present disclosure discloses a central controller controlling multiple radio heads (RHs) in a network. The central controller generates network information for the radio heads based on a probe request transmitted from a network device and received by one or more of the radio heads. The central controller calculates a respective metric value for each of the radio heads based on the network information. The metric value indicates a capability of a radio head to serve the network device. The central controller selects a subset of radio heads from the multiple radio heads to send a probe response to the network device based on the metric values.
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44.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：US10361482B2
公开(公告)日：2019-07-23
申请号：US15220711
申请日：2016-07-27
Applicant: Cisco Technology, Inc.
Inventor： Stephen J. McCarthy , Matthew A. Silverman , Paul J. Stager
Abstract: An apparatus comprises an antenna array, a block of switches, a programmable logic device and a memory device. The antenna array comprises a plurality of antenna elements. The block of switches is configured to selectively connect respective ones of a subset of the plurality of antenna elements to corresponding ones of a plurality of transceivers in a host device. The programmable logic device is configured to communicate with the host device and to control the block of switches. The memory device is coupled to the programmable logic device, and is configured to store information allowing the host device to determine how to control connectivity of individual antenna elements to respective ones of the plurality of transceivers of the host device as part of transmit and/or receive operations of the host device.
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Patent Agency Ranking
公开(公告)号：US09991972B1
公开(公告)日：2018-06-05
申请号：US15497969
申请日：2017-04-26
Applicant: Cisco Technology, Inc.
Inventor： Mithat C. Dogan , Matthew A. Silverman , Paul J. Stager , Brian D. Hart , Jiunming Huang
IPC: H04B15/00 , H04B17/12 , H04L25/02 , H04B7/06 , H04B7/0413
CPC classification number: H04B17/12 , H04B7/022 , H04B7/0617 , H04L25/0202
Abstract: 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. In one embodiment, at least one of the radio heads is isolated from 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.
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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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公开(公告)号：US09706514B2
公开(公告)日：2017-07-11
申请号：US14558205
申请日：2014-12-02
Applicant: Cisco Technology, Inc.
Inventor： Matthew A. Silverman , Paul J. Stager , Brian D. Hart
CPC classification number: H04W64/00 , G01S5/0226 , G01S5/0273 , G01S5/04 , H04W84/12
Abstract: Techniques are presented herein for improving location determination of a wireless device in environments where there can be multipath issues. A wireless device having a plurality of antennas receives a wireless transmission from a target device whose location is to be determined. Channel state information data is generated based on reception of the transmission at the plurality of antenna. The channel state information data is separated or partitioned into subcarrier group specific data for each of a plurality of groups of subcarriers within a bandwidth of the received transmission. Location probability data is computed for each of the plurality of groups of subcarriers from the subcarrier group specific data for respective ones of the plurality of groups of subcarriers. The location probability data for the plurality of groups of subcarriers is combined to produce aggregate location probability data, from which a location of the target device is determined.
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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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