公开(公告)号：US20240323991A1

公开(公告)日：2024-09-26

申请号：US18430591

申请日：2024-02-01

Applicant: Cisco Technology, Inc.

Inventor： Fred J. ANDERSON ,  Paul Jeffrey STAGER ,  Evgeny YANKEVICH ,  Matthew Aaron SILVERMAN

IPC: H04W72/541 ,  G01S7/02 ,  H04W72/0453 ,  H04W88/08

CPC classification number: H04W72/541 ,  G01S7/021 ,  H04W72/0453 ,  H04W88/08

Abstract: Methods and systems for distinguishing between radar signals and Wi-Fi signals are provided. When a set of electromagnetic signals are received, various tests are performed on the signals to determine if the signals are associated with radar pulses or if the signals are more likely to be associated with stray WI-Fi signals or other non-radar interference. One such test relies on the relatively small variance of frequencies used by radar pulses when compared to the high variation of Wi-Fi signals. Another test relies on the relatively low peak to average power ratio of signals associated with radar pulses when compared to Wi-Fi signals. The tests described herein are an improvement on existing methods for distinguishing radar signals from Wi-Fi signals and result in less switching of Wi-Fi channels due to erroneously detected radar signals.

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：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：US20170324153A1

公开(公告)日：2017-11-09

申请号：US15297008

申请日：2016-10-18

Applicant: Cisco Technology, Inc.

Inventor： Erin P. MCGOUGH ,  Daniel N. JOHNSON ,  Thomas G. LUTMAN ,  Fred J. ANDERSON

IPC: H01Q1/24 ,  H01Q7/00 ,  H01Q1/48 ,  H01Q1/52 ,  H01Q21/24 ,  H01Q9/04

CPC classification number: H01Q1/246 ,  H01Q1/2291 ,  H01Q1/521 ,  H01Q7/00 ,  H01Q9/0421 ,  H01Q21/24 ,  H01Q21/28 ,  H01Q21/30

Abstract: The embodiments herein use polarization diversity between antennas where the antennas for one cell are, e.g., horizontally polarized and antennas for the other cell are vertically polarized. In one embodiment, the antennas for a macro cell are vertically polarized while micro cell antennas are horizontally polarized. In one example, the micro cell antennas are printed antennas that form a loop that is co-planar with the magnetic fields generated by the macro cell antennas when transmitting. Because the magnetic fields are co-planar (rather than orthogonal) to the current flowing through the loop in the micro cell antenna, the effect of the electromagnetic signals emitted by the macro cell antenna is reduced. This may permit dual radio network devices to have improved performance when operating simultaneously—e.g., when the macro cell radio is transmitting and the micro cell radio is receiving at or near the same frequency band.

公开(公告)号：US20240291616A1

公开(公告)日：2024-08-29

申请号：US18176318

申请日：2023-02-28

Applicant: Cisco Technology, Inc.

Inventor： Vishal S. DESAI ,  Peiman AMINI ,  Ardalan ALIZADEH ,  Fred J. ANDERSON ,  Bahador AMIRI

IPC: H04L5/00 ,  H04L25/02 ,  H04W72/0453

CPC classification number: H04L5/0053 ,  H04L5/0073 ,  H04L25/0212 ,  H04W72/0453

Abstract: Techniques for dynamically selecting filter parameters for a multi-radio multi-band configuration are described. An example technique includes determining a device class associated with a computing device comprising a plurality of radios operating on a plurality of bands. One or more target operating parameters of the computing device are determined based at least in part on the device class. One or more filter parameters of a plurality of filters for operating the plurality of radios are determined based at least in part on the one or more target operating parameters. The plurality of radios are configured according to the one or more filter parameters.

公开(公告)号：US20230029694A1

公开(公告)日：2023-02-02

申请号：US17443474

申请日：2021-07-27

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep R. KALAVAKURU ,  Ardalan ALIZADEH ,  Fred J. ANDERSON ,  John M. BLOSCO

IPC: H04B7/08

Abstract: In one embodiment, a system for allocating clients between radios of an access point is disclosed. The system includes a first antenna coupled to a first radio, a second antenna coupled to a second radio, and a monitoring radio coupled to the first antenna and second antenna. The system includes computer-readable instructions that cause the system to receive at the monitoring radio, a first client attribute from each of a plurality of first client devices, and a second client attribute from each of a plurality of second client devices, and provide each aforementioned attribute to an optimization function. The system determines, with the optimization function, that one of the first radio and second radio will optimize performance for at least one device of the plurality of first client devices and second client devices and steer the at least one device accordingly.

公开(公告)号：US20210349171A1

公开(公告)日：2021-11-11

申请号：US16867410

申请日：2020-05-05

Applicant: Cisco Technology, Inc.

Inventor： Zhigang GAO ,  Matthew A. SILVERMAN ,  Fred J. ANDERSON ,  Huaiyi WANG

IPC: G01S3/14 ,  G01S5/02 ,  G01S3/74

Abstract: Techniques for determining a location of a client device using recursive phase vector subspace estimation are described. One technique includes receiving a plurality of angle-of-arrival (AoA) measurements from a plurality of access points (APs). Each AoA measurement includes a plurality of entries for phase values measured from a signal received from a client device at the plurality of APs. At least one AoA measurement of the plurality of AoA measurements that includes at least one of: (i) one or more entries with missing phase values and (ii) one or more entries with erroneous phase values is identified, based on a recursive phase estimation. The plurality of AoA measurements are updated based on the identified at least one AoA measurement. The location of the client device is determined, based on the updated plurality of AoA measurements.

公开(公告)号：US20240365490A1

公开(公告)日：2024-10-31

申请号：US18349732

申请日：2023-07-10

Applicant: Cisco Technology, Inc.

Inventor： Fred J. ANDERSON ,  John M. SWARTZ ,  Timothy A. FRANK

IPC: H05K5/02

CPC classification number: H05K5/0247 ,  H04W88/08

Abstract: The present disclosure describes an access point that can operate in two different modes (e.g., an indoor standard power mode or an outdoor standard power mode). A system includes a device and a panel. The device includes a port and a switch. The panel couples to the device to cover the port such that the panel prevents water from entering the port. The switch actuates when the panel covers the port to cause the device to coordinate with an automated frequency coordination system prior to transmitting.

公开(公告)号：US20240187930A1

公开(公告)日：2024-06-06

申请号：US18060843

申请日：2022-12-01

Applicant: Cisco Technology, Inc.

Inventor： John M. SWARTZ ,  Robert E. BARTON ,  Jerome HENRY ,  Matthew A. SILVERMAN ,  Fred J. ANDERSON

IPC: H04W28/08 ,  H04W48/20 ,  H04W72/12

CPC classification number: H04W28/0942 ,  H04W28/0808 ,  H04W48/20 ,  H04W72/1257

Abstract: A method includes monitoring an upstream traffic demand at a first access point and based at least in part on the upstream traffic demand on the first access point, communicating a message that causes a mobile device to transmit upstream messages to the first access point and to receive downstream messages from a second access point. The first access point is physically closer to the mobile device than the second access point.

公开(公告)号：US20240120951A1

公开(公告)日：2024-04-11

申请号：US17938266

申请日：2022-10-05

Applicant: Cisco Technology, Inc.

Inventor： Fred J. ANDERSON

IPC: H04B1/00 ,  H04B1/04

CPC classification number: H04B1/0057 ,  H04B1/04 ,  H04B2001/0408

Abstract: Techniques for wireless antenna multiplexing are disclosed. An antenna system for wireless communication includes a plurality of diplexers and first and second antenna arrays. The first antenna array is coupled to a first radio-frequency integrated circuit (RFIC) configured to operate at a first frequency band including a first plurality of sub-bands, and a second RFIC configured to operate at a second frequency band including a second plurality of sub-bands. The second antenna array is coupled to both the first RFIC and the second RFIC. Adjacent portions of the first plurality of sub-bands and the second plurality of sub-bands are assigned to different antenna arrays of the first and second antenna arrays using the plurality of diplexers.