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    Mid-Packet Clear Channel Assessment
    41.
    发明申请
    Mid-Packet Clear Channel Assessment 有权
    中包清除频道评估

    公开(公告)号：US20130177110A1

    公开(公告)日：2013-07-11

    申请号：US13781822

    申请日：2013-03-01

    Applicant: Cisco Technology, Inc.

    Inventor： Raghuram Rangarajan ,  Brian Donald Hart ,  Paul J. Stager

    IPC: H04L29/06

    CPC classification number: H04L69/22 ,  H04L1/08 ,  H04L7/08 ,  H04L27/2607 ,  H04L27/2647 ,  H04L27/2656 ,  H04L27/2671 ,  H04L27/2679

    Abstract: A mid-packet detection technique is provided that detects a packet with periodic repetitions of a fixed duration at a point in time of the packet other than a start-of-packet pattern, e.g., a preamble, associated with the packet. The process performs packet detection without detecting a preamble and does not require carrier frequency recovery, timing recovery (synchronization) or channel estimation. In one embodiment, a doubly differential matched filter autocorrelation of the received signal is computed and used as a metric for packet detection when the preamble is not observed or to complement preamble detection. The metric is compared to a threshold to indicate detection of a packet.

    Abstract translation: 提供了一种中间包检测技术，其检测分组的周期性重复，该分组在分组的时间点不同于与分组相关联的分组开始模式（例如，前导码）。 该过程执行分组检​​测而不检测前导码，并且不需要载波频率恢复，定时恢复（同步）或信道估计。 在一个实施例中，计算接收信号的双差分匹配滤波器自相关，并将其用作当没有观察到前同步码时的分组检测的度量或用于对前导码检测进行补码。 将度量与阈值进行比较以指示分组的检测。

    Identifying client device locations through group-based access point voting
    44.
    发明授权
    Identifying client device locations through group-based access point voting 有权

    公开(公告)号：US11460534B2

    公开(公告)日：2022-10-04

    申请号：US16748704

    申请日：2020-01-21

    Applicant: Cisco Technology, Inc.

    Inventor： Zhigang Gao ,  Matthew A. Silverman ,  Paul J. Stager ,  Huaiyi Wang

    IPC: G01S3/02 ,  G01S5/02 ,  G01S5/04 ,  H04W84/12

    Abstract: Embodiments herein describe performing AoA resolving to identify a plurality of AoAs corresponding to a multipath signal and then using AP voting to identify a location of the client device. AoA resolving enables an AP to identify the different angles at which a multipath signal reaches the AP. That is, due to reflections, a wireless signal transmitted by a single client device may reach the AP using multiple paths that each has their own AoA. The AP can perform AoA resolving to identify the AoAs for the different paths in a multipath signal. In one embodiment, the AoAs for two APs (or a subset of the APs) can be used to identify cross points or intersection points that represent candidate locations of the client device. A voting module can determine whether those cross points corresponds to AoAs identified by the remaining APs.

    Electronically steerable antenna array
    46.
    发明授权
    Electronically steerable antenna array 有权

    公开(公告)号：US11380991B2

    公开(公告)日：2022-07-05

    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.

    Synchronized wireless signal transmission by endpoints controlled by a central controller
    47.
    发明授权
    Synchronized wireless signal transmission by endpoints controlled by a central controller 有权

    公开(公告)号：US10863465B2

    公开(公告)日：2020-12-08

    申请号：US16388571

    申请日：2019-04-18

    Applicant: Cisco Technology, Inc.

    Inventor： Paul J. Stager ,  David S. Kloper ,  Brian D. Hart ,  Matthew A. Silverman

    IPC: H04W56/00

    Abstract: Techniques are disclosed to synchronize wireless signal transmission by endpoints controlled by a central controller. For example, an example method of wireless communication includes receiving, at a first device, over a wired medium between the first device and a second device, a plurality of packets from the second device. Each of the plurality of packets comprises data representative of a portion of a signal corresponding to a wireless medium. The method further includes receiving, at the first device, from the second device over the wired medium a synchronization signal based on a common master clock at the second device. The method further includes synchronizing, at the first device, a local clock of the first device to the common master clock based on the synchronization signal. The method further includes reconstructing the signal corresponding to the wireless medium based on the plurality of packets and the synchronized local clock.

    INTERNET OF THINGS (IoT) DEVICE LOCATION TRACKING USING MIDAMBLES
    48.
    发明申请
    INTERNET OF THINGS (IoT) DEVICE LOCATION TRACKING USING MIDAMBLES 审中-公开

    公开(公告)号：US20200275426A1

    公开(公告)日：2020-08-27

    申请号：US16287388

    申请日：2019-02-27

    Applicant: Cisco Technology, Inc.

    Inventor： Matthew Silverman ,  Paul J. Stager ,  Xu Zhang

    IPC: H04W72/04 ,  H04L5/00 ,  H04B7/0404 ,  H04B17/318

    Abstract: In one embodiment, a technique for Internet of Things (IoT) device location tracking using midambles is provided. A first wireless device in connection with an antenna array may receive one or more first data symbols of a data payload from a second wireless device using a first antenna state that assigns a radio path, used for location estimation, to a first antenna of the antenna array. Subsequent to identifying a first midamble of the data payload, the first wireless device may change the first antenna state to a second antenna state that assigns the radio path to a second antenna of the antenna array. The first wireless device may receive one or more second data symbols of the data payload using the second antenna state. The first wireless device may determine a location of the second wireless device based on location information determined using the radio path.

    Roaming and probe responses with remote radio heads
    49.
    发明授权
    Roaming and probe responses with remote radio heads 有权

    公开(公告)号：US10455439B2

    公开(公告)日：2019-10-22

    申请号：US15495503

    申请日：2017-04-24

    Applicant: Cisco Technology, Inc.

    Inventor： David S. Kloper ,  Matthew A. Silverman ,  Paul J. Stager

    IPC: H04W24/08 ,  H04W48/16 ,  H04W48/14 ,  H04W48/20 ,  H04W88/08

    Abstract: The present disclosure discloses a central controller controlling multiple radio heads (RHs) in a network. The central controller generates network information for the radio heads based on a probe request transmitted from a network device and received by one or more of the radio heads. The central controller calculates a respective metric value for each of the radio heads based on the network information. The metric value indicates a capability of a radio head to serve the network device. The central controller selects a subset of radio heads from the multiple radio heads to send a probe response to the network device based on the metric values.

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