公开(公告)号：US20210223352A1

公开(公告)日：2021-07-22

申请号：US16748704

申请日：2020-01-21

Applicant: Cisco Technology, Inc.

Inventor： Zhigang GAO ,  Matthew A. SILVERMAN ,  Paul J. STAGER ,  Huaiyi WANG

IPC: G01S5/02 ,  G01S5/04

Abstract: Embodiments herein describe performing AoA resolving to identify a plurality of AoAs corresponding to a multipath signal and then using AP voting to identify a location of the client device. AoA resolving enables an AP to identify the different angles at which a multipath signal reaches the AP. That is, due to reflections, a wireless signal transmitted by a single client device may reach the AP using multiple paths that each has their own AoA. The AP can perform AoA resolving to identify the AoAs for the different paths in a multipath signal. In one embodiment, the AoAs for two APs (or a subset of the APs) can be used to identify cross points or intersection points that represent candidate locations of the client device. A voting module can determine whether those cross points corresponds to AoAs identified by the remaining APs.

公开(公告)号：US20190037496A1

公开(公告)日：2019-01-31

申请号：US15663467

申请日：2017-07-28

Applicant: Cisco Technology, Inc.

Inventor： Zhigang GAO ,  Paul J. STAGER ,  Fred J. ANDERSON

IPC: H04W52/02 ,  H04L27/26 ,  H04W72/04 ,  H04L5/00 ,  H04W16/14

CPC classification number: H04W52/0225 ,  H04L5/0053 ,  H04L27/0008 ,  H04L27/2613 ,  H04W16/14 ,  H04W52/0229 ,  H04W52/0274 ,  H04W72/042 ,  H04W72/0453 ,  H04W76/28

Abstract: Techniques are disclosed for generating 802.11 packets that simulate an 802.11ba Wake-Up Radio (WUR) packet by wireless access points (APs) that implement pre-802.11ba standards. According to one embodiment disclosed herein, a predefined bit stream including a plurality of data bits is evaluated. A data bit of the plurality is mapped to one of a plurality of subcarriers. A symbol is encoded in a data payload of a network packet based on the mapping of the data bit to the subcarrier. The symbol simulates an on-off key (OOK)-modulated symbol in a WUR sequence. The network packet is transmitted to a client device.

公开(公告)号：US20180317188A1

公开(公告)日：2018-11-01

申请号：US15582024

申请日：2017-04-28

Applicant: Cisco Technology, Inc.

Inventor： Paul J. STAGER ,  David S. KLOPER ,  Brian D. HART ,  Matthew A. SILVERMAN

IPC: H04W56/00

CPC classification number: H04W56/0015

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.

公开(公告)号：US20180310191A1

公开(公告)日：2018-10-25

申请号：US15495503

申请日：2017-04-24

Applicant: Cisco Technology, Inc.

Inventor： David S. KLOPER ,  Matthew A. SILVERMAN ,  Paul J. STAGER

IPC: H04W24/08 ,  H04W48/16

CPC classification number: H04W24/08 ,  H04W48/14 ,  H04W48/20 ,  H04W88/085

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.

公开(公告)号：US20180234141A1

公开(公告)日：2018-08-16

申请号：US15431539

申请日：2017-02-13

Applicant: Cisco Technology, Inc.

Inventor： Matthew A. SILVERMAN ,  Paul J. STAGER ,  David S. KLOPER ,  Brian D. HART ,  Qing ZHAO

IPC: H04B7/0452 ,  H04L12/26

CPC classification number: H04B7/0452 ,  H04L41/0893 ,  H04L43/0894

Abstract: Embodiments herein describe a network device (e.g., an access point) that dynamically arranges multi-user (MU) multiple input multiple output (MIMO) compatible client devices into MU-MIMO groups. That is, the network device uses network metrics and historical data to change the assignment of client devices in the MU-MIMO groups which may improve MU-MIMO efficiency by reducing the amount of power that leaks between the clients devices in the group. In one embodiment, the AP identifies a MU-MIMO group based on a performance evaluation such as evaluating network metric or determining if the group is underutilized. The AP can replace the identified MU-MIMO group with a substitute MU-MIMO group where the substitute MU-MIMO group is selected based on historical data corresponding to the client devices assigned to the substitute MU-MIMO group.

公开(公告)号：US20210282132A1

公开(公告)日：2021-09-09

申请号：US16810671

申请日：2020-03-05

Applicant: Cisco Technology, Inc.

Inventor： Pooya MONAJEMI ,  Matthew A. SILVERMAN ,  Gautam D. BHANAGE ,  Paul J. STAGER ,  Fred J. ANDERSON

IPC: H04W72/04

Abstract: Techniques for efficient network probing are provided. Coherence data is received from a plurality of access points (APs), where the coherence data indicates, for each respective AP of the plurality of APs, coherence bandwidth for a plurality of subcarriers. A mapping is generated indicating, for each of the plurality of APs, sets of subcarriers that can be interchangeably sounded. Two or more APs of the plurality of APs that can jointly sound a first subcarrier of the plurality of subcarriers are then identified based on the mapping, and the first subcarrier is allocated to the identified two or more APs for future sounding.

公开(公告)号：US20210135359A1

公开(公告)日：2021-05-06

申请号：US16875655

申请日：2020-05-15

Applicant: Cisco Technology, Inc.

Inventor： Fred J. ANDERSON ,  Danielle N. BANE ,  John M. BLOSCO ,  Paul J. STAGER ,  Daniel N. JOHNSON ,  Timothy A. FRANK ,  John M. SWARTZ

IPC: H01Q3/36 ,  H04B7/0413

Abstract: An electronically a steerable and switchable antenna array is provided that can produce a first beam with a first coverage range and a second beam with a second coverage range by selecting one of a first and a second beamwidth for both the first and second beams; in response to selecting the first beamwidth: switching signal inputs to narrow-beam antenna arrays; steering the first beam to one of a first positive, negative, or zero offset position; independently steering the second beam to one of a second positive, negative offset, or zero offset position; and transmitting signals received from the signal inputs via the first beam and the second beam; and in response to selecting the second beamwidth: switching signal inputs to wide-beam antenna arrays; and transmitting signals received from the signal inputs via the first beam and the second beam.

公开(公告)号：US20180287772A1

公开(公告)日：2018-10-04

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

CPC classification number: H04L7/0012 ,  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：US20210249770A1

公开(公告)日：2021-08-12

申请号：US17302253

申请日：2021-04-28

Applicant: Cisco Technology, Inc.

Inventor： Fred J. ANDERSON ,  Danielle N. BANE ,  John M. BLOSCO ,  Paul J. STAGER ,  Daniel N. JOHNSON ,  Timothy A. FRANK ,  John M. SWARTZ

IPC: H01Q3/36 ,  H04B7/0413 ,  H04B7/06

Abstract: An electronically a steerable and switchable antenna array is provided that can produce a first beam with a first coverage range and a second beam with a second coverage range by selecting one of a first and a second beamwidth for both the first and second beams; in response to selecting the first beamwidth: switching signal inputs to narrow-beam antenna arrays; steering the first beam to one of a first positive, negative, or zero offset position; independently steering the second beam to one of a second positive, negative offset, or zero offset position; and transmitting signals received from the signal inputs via the first beam and the second beam; and in response to selecting the second beamwidth: switching signal inputs to wide-beam antenna arrays; and transmitting signals received from the signal inputs via the first beam and the second beam.

公开(公告)号：US20190246368A1

公开(公告)日：2019-08-08

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

CPC classification number: H04W56/0015

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.