公开(公告)号：US10277384B2

公开(公告)日：2019-04-30

申请号：US15479077

申请日：2017-04-04

Applicant: Cisco Technology, Inc.

Inventor： David S. Kloper ,  Brian D. Hart ,  Paul J. Stager

IPC: H04L7/00 ,  H04L12/10

Abstract: Embodiments herein describe using an intermediate distribution frame (IDF) which is connected between a central controller and a plurality radio heads which each include at least one antenna for wireless communication with a user device. Instead of running separate cables to each of the radio heads, a single cable can be used to connect the IDF to the central controller and then separate cables can be used to connect the IDF to the radio heads. If the IDF is disposed near the radio heads, the amount of cables can be reduced. Moreover, the IDF may recover a clock signal used by the central controller and forward that clock to the plurality of radio head in order to synchronize the radio heads to the central controller.

公开(公告)号：US10277293B1

公开(公告)日：2019-04-30

申请号：US15819254

申请日：2017-11-21

Applicant: Cisco Technology, Inc.

Inventor： Xiaoli Ma ,  Hongyi Fu ,  Brian D. Hart ,  Matthew A. Silverman

IPC: H04B7/0452 ,  H04L25/02 ,  H04L27/26

Abstract: A wireless device, such as an wireless access point, receives signals detected by a plurality of antennas of a wireless device to produce a plurality of antenna-specific receive signals potentially representing a wireless transmission received from each of one or a plurality of devices. A signal processing component of the wireless device, such as a modem, performs several operations on the antenna-specific receive signals, including building a first space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a first device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the first device, and building a second space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a second device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the second device.

公开(公告)号：US10250415B2

公开(公告)日：2019-04-02

申请号：US15447980

申请日：2017-03-02

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  David S. Kloper ,  Jiunming Huang ,  Glendon L. Akins, III

IPC: H04L5/00 ,  H04W72/04 ,  H04W88/12 ,  H04L25/00 ,  H04L27/26 ,  H04W88/08 ,  H04W74/08

Abstract: Techniques are disclosed to reduce latency of processing for access points using a central controller. For example, an example method of wireless communication includes receiving, at an access point, a signal wirelessly. The method further includes filtering the signal using a first passband filter having a first bandwidth to generate a first filtered signal. The method further includes filtering the signal using a second passband filter having a second bandwidth to generate a second filtered signal, wherein the first bandwidth is less than the second bandwidth. The method further includes determining whether the signal includes a packet based on the first filtered signal and generating a control signal indicative of the determination. The method further includes transmitting the control signal and the second filtered signal to a central controller.

公开(公告)号：US20180324858A1

公开(公告)日：2018-11-08

申请号：US15585400

申请日：2017-05-03

Applicant: Cisco Technology, Inc.

Inventor： David Kloper ,  Brian D. Hart ,  Matthew A. Silverman ,  Paul J. Stager

IPC: H04W74/08 ,  H04W74/00

CPC classification number: H04W74/0816 ,  H04L1/0002 ,  H04L1/0007 ,  H04L2001/0092 ,  H04W74/004 ,  H04W74/006 ,  H04W88/085

Abstract: A central processor subsystem controls multiple transceivers. Each transceiver transmits protocol data units from antennas of that transceiver and produces receive waveforms from wirelessly received signals at the one or more antennas. A transmit waveform, including a frame addressed to one or more wireless client devices, is sent through a first transceiver to be transmitted wirelessly by the first transceiver on a frequency channel. A receive waveform, representative of the transmission by the first transceiver and wirelessly received at a second transceiver, is received from the second transceiver. While the transmit waveform is being sent to the first transceiver: a level of collision between the receive waveform and another transmission on the frequency channel is detected; and if the level of collision exceeds a threshold prior to an end of the receive waveform, the transmit waveform being sent to the first transceiver is modified to reduce the collision.

公开(公告)号：US20170346547A1

公开(公告)日：2017-11-30

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: H04B7/08 ,  H04B1/10 ,  H04B7/0452 ,  H04W88/08

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.

公开(公告)号：US20170135131A1

公开(公告)日：2017-05-11

申请号：US15150708

申请日：2016-05-10

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  David Kloper ,  Pooya Monajemi ,  Matthew A. Silverman

IPC: H04W74/08 ,  H04L5/00 ,  H04W52/36 ,  H04W72/04 ,  H04W52/24

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 in response to reception by the second device of a first data unit transmitted by a first 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. The clear channel access parameter is based on a sum of a transmit power used by the first device to transmit the second data unit to the second device and a receive signal strength of the response data unit at the first device. The third device determines a 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.

公开(公告)号：US20150358892A1

公开(公告)日：2015-12-10

申请号：US14296928

申请日：2014-06-05

Applicant: Cisco Technology, Inc.

Inventor： Santosh Pandey ,  Jagdish Girimaji ,  Neil R. Diener ,  Brian D. Hart

IPC: H04W48/10 ,  H04W4/02 ,  H04W48/14 ,  H04W4/20

CPC classification number: H04W48/10 ,  H04W4/029 ,  H04W4/21

Abstract: A wireless access point uses broadcast Service Set Identifiers (SSIDs) to advertise services available to a user device within range of the access point. The access point receives information about a first service available from a first service provider, and generates a first SSID associated with the first service. The access point receives information about a second service available from a second service provider, and generates a second SSID associated with the second service. The access point broadcasts the first SSID during a first period of time in a wireless network, and broadcasts the second SSID in the wireless network during a second period of time that is non-overlapping with the first period of time.

Abstract translation: 无线接入点使用广播服务集标识符（SSID）在接入点的范围内通告用户设备可用的服务。 接入点接收关于可从第一服务提供商获得的第一服务的信息，并且生成与第一服务相关联的第一SSID。 接入点接收关于可从第二服务提供商获得的第二服务的信息，并且生成与第二服务相关联的第二SSID。 接入点在第一时间段内在无线网络中广播第一SSID，并且在与第一时间段不重叠的第二时间段内在无线网络中广播第二SSID。

公开(公告)号：US20150304814A1

公开(公告)日：2015-10-22

申请号：US14258104

申请日：2014-04-22

Applicant: Cisco Technology Inc.

Inventor： Santosh Pandey ,  Brian D. Hart ,  Shaunak Joshi ,  David Kloper ,  Donald R. Peoples

IPC: H04W4/02 ,  H04W56/00

CPC classification number: H04W4/023 ,  H04W48/16 ,  H04W56/001 ,  H04W64/003

Abstract: A wireless receiver (e.g., access point (AP)) is a member of a group of a plurality of receivers in a wireless local area network and time synchronized with other receivers in the group. A channel scan list is generated from a plurality of wireless channels available in one or more frequency bands. A channel is selected for the receiver to monitor from the channel scan list based on a current time at the receiver such that each of the plurality of receivers in the group are scanning the same channel at the same time. The selected channel is scanned and signal characteristic information (e.g., received signal strength (RSS)) is generated for the signals received during a given scan duration.

Abstract translation: 无线接收器（例如，接入点（AP））是无线局域网中的多个接收机的组的成员，并且与该组中的其他接收机同步的时间。 从一个或多个频带中可用的多个无线信道生成频道扫描列表。 基于接收机当前的时间，从频道扫描列表中选择频道以使接收机监视，使得组中的多个接收机中的每一个同时扫描相同的频道。 扫描所选择的信道，并且在给定的扫描持续时间内为接收到的信号生成信号特征信息（例如，接收信号强度（RSS））。

公开(公告)号：US20150003261A1

公开(公告)日：2015-01-01

申请号：US13928452

申请日：2013-06-27

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. Silverman ,  Paul J. Stager ,  Brian D. Hart

IPC: H04W24/08 ,  H04B7/04

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0456 ,  H04L1/203 ,  H04L1/24 ,  H04L2025/03426 ,  H04W24/06

Abstract: A first device having a plurality of antennas wirelessly transmits multiple series of test packets to a second device having one or more antennas, each series of test packets being transmitted with a different level of interference imposed on the test packets. The first device determines a packet error rate for each series of test packets transmitted by the first device. The first device derives an estimate of an interference cancellation capability of the second device based on the packet error rate for different levels of interference.

Abstract translation: 具有多个天线的第一设备将具有一个或多个天线的第二设备无线地发射多个测试分组，每一组测试分组以不同的干扰等级施加在测试分组上。 第一设备确定由第一设备发送的每一系列测试分组的分组错误率。 第一设备基于不同级别的干扰的分组错误率导出第二设备的干扰消除能力的估计。

公开(公告)号：US20140295877A1

公开(公告)日：2014-10-02

申请号：US13855278

申请日：2013-04-02

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Brian D. Hart

IPC: H04W4/02

CPC classification number: H04W64/003 ,  H04W4/02 ,  H04W4/06 ,  H04W64/00 ,  H04W84/12

Abstract: Techniques are presented herein to coordinate ranging exchanges between base stations in order to enable any number of wireless devices in the vicinity of the base stations to obtain signals associated with ranging exchanges between base stations, time-of-departure report messages transmitted by the base stations to each other and time-of-arrival report messages transmitted by the base stations to each other, for use in computing the location of the wireless devices. Based on the multi-channel time-of-arrivals computed for the wireless device with respect to each base station, the multi-channel time-of-arrivals contained in the time-of-arrival report messages transmitted between base stations and the known locations of the base stations, a physical location is computed for the wireless device.

Abstract translation: 这里介绍了技术来协调基站之间的测距交换，以使得基站附近的任何数量的无线设备能够获得与基站之间的测距交换相关联的信号，由基站发送的发往时间的报告消息 彼此之间以及由基站彼此发送的到达时间报告消息，以用于计算无线设备的位置。 基于针对每个基站为无线设备计算的多信道到达时间，包括在基站和已知位置之间传送的到达时间报告消息中的多信道到达时间 的基站，为无线设备计算物理位置。