公开(公告)号：US20220311524A1

公开(公告)日：2022-09-29

申请号：US17301180

申请日：2021-03-29

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep R. KALAVAKURU ,  Ardalan ALIZADEH ,  Matthew A. SILVERMAN ,  Gautam D. BHANAGE

IPC: H04B17/318 ,  H04B17/10

Abstract: Techniques for identifying an orientation for an antenna in a wireless communication device. A plurality of estimates of antenna gain are determined for an antenna associated with a wireless access point (AP), the plurality of estimates of antenna gain relating to a plurality of wireless stations (STAs) associated with the AP. An orientation for the antenna is determined based on the plurality of estimates of antenna gain and a plurality of properties for the antenna.

公开(公告)号：US20250062838A1

公开(公告)日：2025-02-20

申请号：US18936896

申请日：2024-11-04

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep KALAVAKURU ,  Fred ANDERSON ,  Xiangxiang FANG ,  Ardalan ALIZADEH

IPC: H04B17/11 ,  H04L1/00 ,  H04W52/52

Abstract: Real-time radio self-calibration may be provided. The self-calibration may begin by sampling a Transmission (TX) signal. An achievable Error Vector Magnitude (EVM) for one or more frames may be determined based on the TX signal. Link budgets for clients may be determined using a TX power and a supported Modulation and Coding Scheme (MCS). A per packet TX power is adjusted based on the achievable EVM and a TX retry rate. The PA linearity of the radio may also be adjusted based on the achievable EVM and the link budget. The client may be regrouped into a new MCS based on the link budget.

公开(公告)号：US20240381422A1

公开(公告)日：2024-11-14

申请号：US18316115

申请日：2023-05-11

Applicant: Cisco Technology, Inc.

Inventor： Ardalan ALIZADEH ,  Vishal S. DESAI ,  Brian D. HART ,  Peiman AMINI

IPC: H04W74/08

Abstract: Embodiments herein transmit and receive in a secondary channel when a primary channel is active. In the embodiment, an access point determines that the primary channel is active, which may include waiting until a MAC header of a frame transmitted over the primary channel is decoded. In some embodiments, the access point tests that the received power is below a threshold. When it is determined that the primary channel is active and the received power is below the threshold, the access point transmits an RTS frame and receives a CTS frame over the secondary channel to reserve the secondary channel for a specified duration. In some embodiments, the access point uses NAV tracking to determine the duration of use of the primary channel to avoid collisions on the primary channel.

公开(公告)号：US20240334514A1

公开(公告)日：2024-10-03

申请号：US18295208

申请日：2023-04-03

Applicant: Cisco Technology, Inc.

Inventor： Sachin D. WAKUDKAR ,  Ardalan ALIZADEH ,  Shailender POTHARAJU ,  Ugo M. CAMPIGLIO ,  Jerome HENRY

IPC: H04W76/15 ,  H04W76/38

CPC classification number: H04W76/15 ,  H04W76/38 ,  H04W88/10

Abstract: Techniques for improved multi-link operations are provided. A first link between a first access point (AP) multi-link device (MLD) and a non-AP MLD is established. A first idle timeout timer is generated for the first link, and an indication of one or more links between the non-AP MLD and a second AP MLD is received from the non-AP MLD. An indication of the first link is transmitted to the second AP MLD and from the first AP MLD. In response to determining that one or more link termination criteria are satisfied with respect to the first link, the first link is terminated, where subsequent to terminating the first link, the non-AP MLD continues to exchange data with the second AP MLD using the one or more links.

公开(公告)号：US20240334512A1

公开(公告)日：2024-10-03

申请号：US18193368

申请日：2023-03-30

Applicant: Cisco Technology, Inc.

Inventor： Sivadeep Reddy KALAVAKURU ,  Fred Jay ANDERSON ,  Robert BADEA ,  Ardalan ALIZADEH

IPC: H04W76/15 ,  H04L1/00 ,  H04W72/0453

CPC classification number: H04W76/15 ,  H04L1/0013 ,  H04W72/0453

Abstract: Alleviating spectral regrowth and Receive (RX) blocking may be provided. To alleviate spectral regrowth and RX blocking one or more targeted intermodulation products may be identified for a Transmit (TX) data packet of a radio of a Multi-Link Device (MLD). A puncture resolution and a puncture position on the Bandwidth (BW) of the TX data packet may then be determined. A puncture of the TX data packet may then be caused, wherein the puncture has the puncture resolution and the puncture position.

公开(公告)号：US20240283538A1

公开(公告)日：2024-08-22

申请号：US18172948

申请日：2023-02-22

Applicant: Cisco Technology, Inc.

Inventor： Brian D. HART ,  Ardalan ALIZADEH

IPC: H04B10/27 ,  H04B10/2575

CPC classification number: H04B10/27 ,  H04B10/25752

Abstract: A wireless network architecture with optical connections is described, the architecture enables fronthaul connections that ensure reliable communication between RH and central controllers without being hampered by impairments and other interference in the connections. The architecture includes a central control system, a plurality of radio heads, and a plurality of optical fiber fronthaul connections between the central control system and the plurality of radio heads.

公开(公告)号：US20240015642A1

公开(公告)日：2024-01-11

申请号：US18066870

申请日：2022-12-15

Applicant: Cisco Technology, Inc.

Inventor： Pooya MONAJEMI ,  Brian D. HART ,  Vishal S. DESAI ,  Peiman AMINI ,  Ardalan ALIZADEH

IPC: H04W48/18 ,  H04W24/04 ,  H04W76/38

CPC classification number: H04W48/18 ,  H04W24/04 ,  H04W76/38 ,  H04W88/06

Abstract: A system includes a memory and a processor communicatively coupled to the memory. The processor, in response to determining that a first number of transmissions over a first link with a first frequency has failed, selects a second link with a second frequency for transmission. The second frequency is lower than the first frequency. The processor also, in response to determining that a second number of transmissions over the second link has failed, one or more of (i) stop the transmissions over the second link or (ii) begins transmissions over a third link with a third frequency. The second number is greater than the first number.

公开(公告)号：US20240014871A1

公开(公告)日：2024-01-11

申请号：US18063576

申请日：2022-12-08

Applicant: Cisco Technology, Inc.

Inventor： Ardalan ALIZADEH ,  Peiman AMINI ,  Matthew A. SILVERMAN ,  Laurent A. PIERRUGUES

IPC: H04B7/06

CPC classification number: H04B7/0626 ,  H04B7/066

Abstract: Techniques for enhanced wireless sensing or ranging are provided. First and second channel state information (CSI) data, for a first and second link of a plurality of links in a multi-link operation (MLO) system, is collected. A set of channel parameters is estimated, based on the second CSI data, using a channel propagation model. First predicted CSI data for the first link is generated based on the estimated set of channel parameters. The first CSI data is calibrated based on the first predicted CSI data, comprising determining at least one of an amplitude difference or a phase difference between the first CSI data and the first predicted CSI data. Aggregated CSI data is generated based on the calibrated first CSI data and the second CSI data, and at least one of wireless sensing or wireless ranging is performed based on the aggregated CSI data.

公开(公告)号：US20230034115A1

公开(公告)日：2023-02-02

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

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：US20220417873A1

公开(公告)日：2022-12-29

申请号：US17305032

申请日：2021-06-29

Applicant: Cisco Technology, Inc.

Inventor： Gautam D. BHANAGE ,  Matthew A. SILVERMAN ,  Sivadeep R. KALAVAKURU ,  Ardalan ALIZADEH

IPC: H04W56/00 ,  H04W8/00 ,  H04W16/14 ,  H04W72/12

Abstract: Techniques for neighborhood management between WiFi and unlicensed spectrum radios. A wireless access point (AP), including a first radio, identifies a neighboring second radio operating using at least a portion of an unlicensed radio spectrum, based on a time that the AP receives a transmission from the second radio using a frequency within the unlicensed radio spectrum. Transmission between the first radio and the second radio is synchronized by identifying a clock offset between a first clock relating to the first radio and a second clock relating to the second radio.