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21.发明申请公开(公告)号：US20150207554A1
公开(公告)日：2015-07-23
申请号：US14670051
申请日：2015-03-26
Applicant: Cisco Technology, Inc.
Inventor： Eldad Perahia , Bretton Lee Douglas , Brian Hart , Daniel Joseph Lyons
CPC classification number: H04B7/0608 , H04B7/0602 , H04B7/0615 , H04L25/022 , H04L25/0224 , H04L25/03343 , H04L27/2601 , H04L2027/0095 , H04W84/12
Abstract: A method and an apparatus in a first wireless station of a network transmitting to a second wireless station. The network uses multi-tone OFDM signals. The first station includes multiple antennas and a receive and a transmit signal path per antenna. Each receive signal path includes a discrete Fourier transformer determining the tones in a received signal, and each transmit signal path includes an inverse discrete Fourier transformer converting tones to a signal. The method includes determining channel estimates for each tone and each receive path while receiving from the second station, determining transmit weights to transmit to the second station, tone-by-tone weighting a signal for transmission to the second station to produce weighted tone sets for each transmit signal path, and transmitting the weighted tone sets. The first station is configured so that the weighting produces additive beamforming without the second station needing multiple antennas.
Abstract translation: 一种发送到第二无线站的网络的第一无线站中的方法和装置。 网络使用多音频OFDM信号。 第一站包括多个天线以及每个天线的接收和发射信号路径。 每个接收信号路径包括确定接收信号中的音调的离散傅里叶变换器，并且每个发射信号路径包括将音调转换为信号的离散傅立叶变换逆变换器。 该方法包括确定每个音调和每个接收路径的信道估计，同时从第二站接收确定发送权重以发送给第二站，逐个音调加权信号以传输到第二站以产生加权音调集合 每个发送信号路径，并发送加权音调集。 第一站被配置为使得加权产生加法波束成形，而不需要第二站需要多个天线。
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公开(公告)号：US20210321473A1
公开(公告)日：2021-10-14
申请号：US17001100
申请日：2020-08-24
Applicant: Cisco Technology, Inc.
Inventor： Pooya Monajemi , Brian Hart
IPC: H04W76/15 , H04W24/10 , H04B17/336 , H04B17/318 , H04L1/00
Abstract: A method is performed at a first multilink device configured to communicate wirelessly with a first radio and a second radio of a second multilink device. The method includes accessing a set of parameters for a known mathematical model that establishes a frequency separation to be imposed between transmission from the first radio and reception at the second radio in order to achieve a predetermined reception performance at the second radio when the transmission and the reception are simultaneous. The method further includes, using the known mathematical model, computing the frequency separation based on the set of parameters.
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23.发明申请公开(公告)号：US20210226989A1
公开(公告)日：2021-07-22
申请号：US17223323
申请日：2021-04-06
Applicant: Cisco Technology, Inc.
Inventor： Gautam Bhanage , David Kloper , Brian Hart
Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.
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24.发明授权公开(公告)号：US11012469B2
公开(公告)日：2021-05-18
申请号：US16253329
申请日：2019-01-22
Applicant: Cisco Technology, Inc.
Inventor： Gautam Bhanage , David Kloper , Brian Hart
Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.
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公开(公告)号：US20210067283A1
公开(公告)日：2021-03-04
申请号：US16804428
申请日：2020-02-28
Applicant: Cisco Technology, Inc.
Inventor： Brian Hart , David Kloper
Abstract: Presented herein is a tone plan that can accommodate multiple bandwidth options. This tone plan may be designed around a fundamental tile, such as 20 MHz tile, that is replicated to 40 and 80 MHz (and 160 MHz and beyond). For wider bandwidths, the otherwise-unused guard tones between the 20 MHz tiles are filled by a new resource unit and DC tones. There are DC tones placed to support any client, for all defined and plausible future values of its current operating bandwidth and center frequency (i.e. any 20 MHz, any 40 MHz, any 80 MHz, 160 MHz and 80+80 MHz, 320, 160+80 etc.), as well as plausible future preamble puncturing cases.
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Patent Agency Ranking
26.发明申请公开(公告)号：US20200236134A1
公开(公告)日：2020-07-23
申请号：US16253329
申请日：2019-01-22
Applicant: Cisco Technology, Inc.
Inventor： Gautam Bhanage , David Kloper , Brian Hart
Abstract: A management entity obtains from a first wireless access point a Basic Service Set (BSS) color collision event detected by the first wireless access point. The first wireless access point uses a first BSS color. A color collision event occurs when the first wireless access point receives from a device in a BSS of a different physical wireless access point a frame or PHY Protocol Data Unit (PPDU) that includes the first BSS color. The management entity obtains from the first wireless access point an indication whether the color collision event has been detected for longer than a predetermined duration. When the color collision event has been detected for longer than the predetermined duration, the management computes a probability of the color collision event. The management entity determines whether the color collision event is malicious or benign, and determines whether to maintain the first BSS color.
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公开(公告)号：US09967771B2
公开(公告)日：2018-05-08
申请号：US14933056
申请日：2015-11-05
Applicant: Cisco Technology, Inc.
Inventor： Rajesh Pazhyannur , Brian Hart , Andrew Myles , Vikram Chandrasekhar
CPC classification number: H04W28/04 , H04B17/318 , H04L43/16 , H04W16/14 , H04W72/044 , H04W74/0808 , H04W84/12
Abstract: Presented herein are mechanisms to reduce collisions in deployments with Wi-Fi and Shared Access LTE (SAC-LTE) equipment as well SAC-LTE equipment from multiple operators. The mechanisms enhance the baseline energy detection mechanism by incorporating methods to decode cross-technology physical layer elements and media access control (MAC) layer elements in the Wi-Fi system to elements in the SAC-LTE system. The methods described improve the detection potential for transmitters, thereby reducing chances of cross-technology collisions.
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公开(公告)号：US20240187876A1
公开(公告)日：2024-06-06
申请号：US18062102
申请日：2022-12-06
Applicant: Cisco Technology, Inc.
Inventor： Malcolm Smith , Brian Hart
IPC: H04W24/02 , H04B17/318
CPC classification number: H04W24/02 , H04B17/318
Abstract: Improved granularity of Coordination Groups (CGs) using sectorization may be provided. A plurality of sectors around a plurality of Access Points (APs) may be determined. Then, for each of the plurality of APs, it may be determined which sector client devices associated with each of the plurality of APs are in. Next, each of the plurality of APs may be caused to transmit to client devices in a first one of the plurality of sectors.
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公开(公告)号：US20240179644A1
公开(公告)日：2024-05-30
申请号：US18060099
申请日：2022-11-30
Applicant: Cisco Technology, Inc.
Inventor： Malcolm Smith , Brian Hart
IPC: H04W56/00
CPC classification number: H04W56/001
Abstract: Differential time synchronization and scheduling may be provided. A first Access Point (AP) may wirelessly receive time-base translation parameters of a second AP. The first AP and the second AP may be neighboring. Next, a first transmission schedule for the first AP and a second transmission schedule for the second AP may be maintained. Then the second transmission schedule for the second AP may be translated into a time-base of the first AP based on the time-base translation parameters of the second AP. Then the first AP may transmit based upon the first transmission schedule for the first AP and the translated second transmission schedule for the second AP.
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30.发明授权公开(公告)号：US11916670B2
公开(公告)日：2024-02-27
申请号：US18171760
申请日：2023-02-21
Applicant: Cisco Technology, Inc.
Inventor： Brian Hart , Zhigang Gao
IPC: H04L1/00
CPC classification number: H04L1/0068
Abstract: Preamble puncturing configuration information is encoded in a pad field, and alternatively or additionally, in a Service Field, depending on a transmission bandwidth of a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU). Some implementations also encode one or more parity bits in the pad field or Service field. The PPDU including the preamble puncturing configuration information encodes, in various embodiments, a request to send frame, a clear to send frame, a power save poll frame, or a contention free end frame.
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