知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

19 records (took 0.033 seconds)

    Dynamic frequency selection with discrimination
    13.
    发明授权
    Dynamic frequency selection with discrimination 有权

    公开(公告)号：US09838882B1

    公开(公告)日：2017-12-05

    申请号：US15333786

    申请日：2016-10-25

    Applicant: Cisco Technology, Inc.

    Inventor： Evgeny Yankevich ,  Jack Chuang

    IPC: H04W16/12 ,  H04W16/14 ,  H04B17/336 ,  H04W84/12

    CPC classification number: H04W16/14 ,  H04B17/336 ,  H04K3/226 ,  H04K3/822 ,  H04K2203/18 ,  H04W84/12

    Abstract: Dynamic frequency selection (DFS) is often a requirement for a wireless local area network (WLAN) apparatus to prevent the apparatus from interfering with other systems that have a priority to a radio frequency (RF) channel. When DFS is executed, the WLAN apparatus ceases WLAN operations on the channel and searches for an open channel to resume WLAN operations. Often a WLAN apparatus misinterprets signals from another system as operating on the channel when actually the received signals are signals leaked into the channel from a system transmitting on a different channel. Presented herein are methods and apparatuses for preventing unnecessary DFS operations resulting from misinterpreted signals through the use of a signal to noise ratio determined from a pulse spectral density of the received signal.

    Systems and methods for reducing false radar detection
    14.
    发明授权
    Systems and methods for reducing false radar detection 有权

    公开(公告)号：US11910423B2

    公开(公告)日：2024-02-20

    申请号：US17512098

    申请日：2021-10-27

    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.

    Dynamic automatic gain controller configuration in multiple input and multiple output receivers
    15.
    发明授权
    Dynamic automatic gain controller configuration in multiple input and multiple output receivers 有权

    公开(公告)号：US11283420B1

    公开(公告)日：2022-03-22

    申请号：US17081474

    申请日：2020-10-27

    Applicant: Cisco Technology, Inc.

    Inventor： Matthew A. Silverman ,  Evgeny Yankevich ,  John M. Swartz

    IPC: H03G3/30 ,  H03G3/00 ,  H04W28/02 ,  H04B1/10

    Abstract: Dynamic automatic gain controller configuration in multiple input and multiple output receivers is provided by monitoring a given section of wireless spectrum for higher-priority signals using a first antenna set associated with a first Automatic Gain Controller (AGC) set while concurrently monitoring the given section of wireless spectrum for wireless packet-based traffic using a second antenna set associated with a second AGC set; in response to detecting a packet via the second antenna set: re-associating the first antenna set and the second antenna set to a third AGC set; receiving the packet via the first antenna set and the second antenna set using the third AGC set; and in response to the packet being received, re-associating the first antenna set to the first AGC set and the second antenna set to the second AGC set.

    Detection and Decoding of Wireless Synchronization Signals
    16.
    发明申请
    Detection and Decoding of Wireless Synchronization Signals 有权

    公开(公告)号：US20210075534A1

    公开(公告)日：2021-03-11

    申请号：US16562598

    申请日：2019-09-06

    Applicant: Cisco Technology Inc.

    Inventor： Huaiyi Wang ,  Matthew Aaron Silverman ,  Zhigang Gao ,  Evgeny Yankevich

    IPC: H04J11/00 ,  H04L5/00 ,  H04L25/03

    Abstract: A wireless node in a wireless communication network. The wireless node includes one or more interfaces configured to receive wireless transmissions, a memory comprising instructions, and a hardware processor. The wireless node samples a received wireless transmission into a plurality of time-based subdivisions. for each subdivision of the wireless transmission the wireless node determines a cross-correlation between the subdivision and a local syncword. The local syncword is constructed to correlate to any primary synchronization signal, PSS, of a plurality of PSSs defined for synchronization in the wireless network. The wireless node, based on the cross-correlation, determines whether one PSS of the plurality of PSSs is present in the subdivision of the wireless transmission.

    System and method for identifying an off-channel radio frequency source
    17.
    发明授权
    System and method for identifying an off-channel radio frequency source 有权

    公开(公告)号：US10735972B2

    公开(公告)日：2020-08-04

    申请号：US16519364

    申请日：2019-07-23

    Applicant: Cisco Technology, Inc.

    Inventor： Evgeny Yankevich

    IPC: H04W16/14 ,  H04W24/08 ,  H04B1/00 ,  H04W84/12

    Abstract: In a shared radio frequency (RF) band, regulations or standards can stipulate that a device using an RF channel must vacate the RF channel if another device having priority to the channel is detected. It takes time, however, to move channels and this added time reduces the effective speed of the communication. In some cases, a received signal from the other device may be received on the channel when the other device is not, in fact, operating on the channel. These received signals can lead the device to move channels, thereby slowing communications unnecessarily. Accordingly, disclosed herein are a system and method for checking the characteristics of a received signal's spectrum to determine if the source of the received signal is on-channel or off-channel. This determination may be used to minimize the device from taking unnecessary interference avoidance measures, such as dynamic frequency selection.

    DYNAMIC FREQUENCY SELECTION WITH DISCRIMINATION
    18.
    发明申请
    DYNAMIC FREQUENCY SELECTION WITH DISCRIMINATION 审中-公开

    公开(公告)号：US20180115909A1

    公开(公告)日：2018-04-26

    申请号：US15802667

    申请日：2017-11-03

    Applicant: Cisco Technology, Inc.

    Inventor： Evgeny Yankevich ,  Jack Chuang

    IPC: H04W16/14 ,  H04W84/12

    CPC classification number: H04W16/14 ,  H04B17/336 ,  H04K3/226 ,  H04K3/822 ,  H04K2203/18 ,  H04W84/12

    Abstract: Dynamic frequency selection (DFS) is often a requirement for a wireless local area network (WLAN) apparatus to prevent the apparatus from interfering with other systems that have a priority to a radio frequency (RF) channel. When DFS is executed, the WLAN apparatus ceases WLAN operations on the channel and searches for an open channel to resume WLAN operations. Often a WLAN apparatus misinterprets signals from another system as operating on the channel when actually the received signals are signals leaked into the channel from a system transmitting on a different channel. Presented herein are methods and apparatuses for preventing unnecessary DFS operations resulting from misinterpreted signals through the use of a signal to noise ratio determined from a pulse spectral density of the received signal.

    Roaming Techniques for High Speed Client Device
    19.
    发明申请
    Roaming Techniques for High Speed Client Device 有权
    高速客户端设备漫游技术

    公开(公告)号：US20150264614A1

    公开(公告)日：2015-09-17

    申请号：US14449763

    申请日：2014-08-01

    Applicant: Cisco Technology, Inc.

    Inventor： Paul J. Stager ,  Tak Ming Pang ,  Evgeny Yankevich ,  Arnab Sengupta

    IPC: H04W36/18 ,  H04W36/32 ,  H04W36/00 ,  H04W36/30

    CPC classification number: H04W36/18 ,  H04W36/0061 ,  H04W36/0083 ,  H04W36/0088 ,  H04W36/30 ,  H04W36/32 ,  H04W48/16 ,  H04W84/005

    Abstract: Access points and a wireless client device, such as a workgroup bridge, are configured to optimize a roaming algorithm of the client device for a high-speed vehicle scenario, such as a high-speed train. A static/dynamic neighbor list is generated and used to improve scanning efficiency. An improved parent access point selection procedure, metrics, and thresholds are provided to optimize client roaming along the vehicle's path, e.g., the train track.

    Abstract translation: 接入点和诸如工作组桥的无线客户端设备被配置为优化用于诸如高速列车的高速车辆场景的客户端设备的漫游算法。 生成静态/动态邻居列表，用于提高扫描效率。 提供改进的父接入点选择过程，度量和阈值以优化沿着车辆路径（例如，列车轨道）的客户端漫游。

Patent Agency Ranking