公开(公告)号：US20250105805A1

公开(公告)日：2025-03-27

申请号：US18893094

申请日：2024-09-23

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Sachin D. Wakudkar ,  Nedime Pelin Mohamed Hassan Salem

IPC: H03F3/24 ,  H04W16/14

Abstract: Interoperable Transmit Power Envelop (TPE) signaling with Automated Frequency Coordination (AFC) frequency response may be provided. First, AFC information may be received. Next a mask may be determined for a punctured channel indicated in the AFC information. Then a first amount may be determined that the mask needs to be altered to reach an AFC response for the punctured channel indicated in the AFC information. A Transmit Power Envelop (TPE) value may then be reported for the punctured channel comprising the first amount plus a second amount.

公开(公告)号：US12081515B1

公开(公告)日：2024-09-03

申请号：US18305105

申请日：2023-04-21

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Stephen M. Orr ,  Venkataprasad Chirreddy

IPC: H04L61/5046 ,  H04L61/5038 ,  H04L101/622

CPC classification number: H04L61/5046 ,  H04L61/5038 ,  H04L2101/622

Abstract: The present disclosure describes a system and method for deconflicting locally administered medium access control addresses (LAMAs). An apparatus includes a memory and a processor communicatively coupled to the memory. The processor receives a request for a client device to use a LAMA and determines that the LAMA is reserved for future use by a first access point. The processor also transmits to the client device a message denying connectivity to the client device using the LAMA.

公开(公告)号：US20240275505A1

公开(公告)日：2024-08-15

申请号：US18168754

申请日：2023-02-14

Applicant: Cisco Technology, Inc.

Inventor： Audrey Yazdanparast ,  Brian D. Hart

IPC: H04B17/336

CPC classification number: H04B17/336

Abstract: Signal to Interference and Noise Ratio (SINR) estimation, and more specifically providing SINR estimation during Legacy Long Training Field (LLTF) accounting for Inter Symbol Interference (ISI) may be provided. SINR estimation may include receiving a Physical Layer Protocol Data Unit (PPDU) including a LLTF and extracting groups of transmission symbols from the LLTF. Next, groups of fragmented symbols may the groups of transmission symbols. One or more Sum of the Squared Magnitudes (SSM) may be determined, such as an SSM of the total signal, an SSM of the signal without ISI and/or noise, an SSM of ISI, an SSM of noise. Finally, SINR may be estimated using one or more SSMs (e.g., the SSM of noise, the SSM of signal, and the SSM of ISI).

公开(公告)号：US11722981B2

公开(公告)日：2023-08-08

申请号：US17444008

申请日：2021-07-29

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Ardalan Alizadeh ,  Daniel J. Lyons ,  Matthew A. Silverman

IPC: H04W56/00 ,  H04L27/26

CPC classification number: H04W56/0095 ,  H04L27/2657

Abstract: Aspects discussed herein include a method and associated network device and computer program product. The method includes receiving a network packet, and estimating, using a preamble of the network packet, a power distribution corresponding to a plurality of subcarriers of a channel. The method further includes estimating a carrier frequency offset using the power distribution, and estimating a clock offset using the carrier frequency offset.

公开(公告)号：US20220061044A1

公开(公告)日：2022-02-24

申请号：US17521327

申请日：2021-11-08

Applicant: Cisco Technology, Inc.

Inventor： Benjamin Jacob Cizdziel ,  Brian D. Hart ,  Pooya Monajemi ,  David Kloper

IPC: H04W72/04 ,  H04L5/00 ,  H04W72/08

Abstract: Bypassing radar in wide Dynamic Frequency Selection (DFS) channels utilizing puncturing may be provided. A first client device may be classified as eligible for puncturing and a second client device may be classified as not eligible for puncturing. Next, it may be determined that a subchannel in a bandwidth range should not be used. Then, in response to determining that the subchannel in the bandwidth range should not be used, the first client device may be steered to a first subset of the bandwidth range and the second client device may be steered to a second subset of the bandwidth range. The second subset of the bandwidth range may be smaller than the first subset of the bandwidth range.

公开(公告)号：US10938600B2

公开(公告)日：2021-03-02

申请号：US16262444

申请日：2019-01-30

Applicant: Cisco Technology, Inc.

Inventor： David S. Kloper ,  Brian D. Hart ,  Dipankar B. Acharya

IPC: H04L12/64 ,  H04L12/46 ,  H04W16/02 ,  H04W88/08 ,  H04W24/02 ,  H04W88/10

Abstract: The present disclosure discloses a distributed system. The distributed system includes a plurality of radio heads and a plurality of controllers disposed in one or more chassis external to the plurality of radio heads. Each of the plurality of controllers includes a baseband unit (BBU), an uplink time-division multiplexing (TDM) switch and a downlink TDM switch. The uplink TDM switch and the downlink TDM switch forward data bits between a radio head and a BBU by using TDM cells which may reduce latency relative to using Ethernet frames.

公开(公告)号：US10785059B2

公开(公告)日：2020-09-22

申请号：US16372201

申请日：2019-04-01

Applicant: Cisco Technology, Inc.

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

IPC: H04L25/00 ,  H04L27/26 ,  H04W88/08 ,  H04L5/00 ,  H04W88/12 ,  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：US10693512B1

公开(公告)日：2020-06-23

申请号：US16457588

申请日：2019-06-28

Applicant: Cisco Technology, Inc.

Inventor： Khashayar Mirfakhraei ,  Ardalan Alizadeh ,  Xu Zhang ,  Gautam D. Bhanage ,  Daniel J. Lyons ,  Brian D. Hart

IPC: H03D1/04 ,  H03D1/06 ,  H03K5/01 ,  H03K6/04 ,  H04B1/10 ,  H04L1/00 ,  H04L25/08 ,  H04B1/12 ,  H04B1/04 ,  H04B1/18

Abstract: The present disclosure provides for distortion cancelled by receiving a collided signal comprising first and second signals carrying respective first and second packets; digitizing the collided signal into a first digital signal and decoding the first packet therefrom; calculating a digital linear interference component of the first packet on the second from an estimated signal re-encoding the decoded first packet; synthesizing an analog linear interference component from the digital linear interference component; determining a digital nonlinear interference component of the first packet on the second from the first digital signal; amplifying the collided signal to produce a second amplified signal; removing the analog linear interference component from the second amplified signal to produce a partially de-interfered signal; removing the digital nonlinear interference component from the partially de-interfered signal to produce a de-interfered signal; and decoding the second packet from the de-interfered signal.

公开(公告)号：US10601475B2

公开(公告)日：2020-03-24

申请号：US16383915

申请日：2019-04-15

Applicant: Cisco Technology, Inc.

Inventor： Brian D. Hart ,  Paul J. Stager ,  David Kloper ,  Jie Cheng Jiang

IPC: H04W72/04 ,  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.

公开(公告)号：US10306675B2

公开(公告)日：2019-05-28

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 ,  H04L1/00 ,  H04W88/08

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.