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    Respiration monitoring based on noisy channel state information (CSI) data
    11.
    发明授权
    Respiration monitoring based on noisy channel state information (CSI) data 有权

    公开(公告)号：US12279190B1

    公开(公告)日：2025-04-15

    申请号：US17853641

    申请日：2022-06-29

    Applicant: Amazon Technologies, Inc.

    Inventor： Feng Zhang ,  Xiaofu Ma ,  Piyush Tayal ,  Cong Phuoc Huynh ,  Xi Chen ,  Mohammed Rana Basheer ,  Avinash Joshi

    IPC: H04W4/38 ,  H04B7/06 ,  H04B17/336 ,  H04W4/021 ,  H04W52/52 ,  H04W84/12

    Abstract: Technologies directed to respiration monitoring based on noise channel state information (CSI) data are described. A method includes receiving CSI data representing channel properties of a wireless channel used by a first wireless device and a second wireless device located in a geographical region. The method generates a set of CSI samples by sampling the CSI data and removes one or more outlier CSI samples using a sparse outlier process, and removes a cluster of outlier samples using a cluster outlier process. The method determines Fast Fourier Transform (FFT) data for each channel subcarrier index and a signal-to-noise ratio (SNR) value for each channel subcarrier index, and identifies a first number of channel subcarrier indexes having highest SNR values to obtain a subset of FFT data, which represents a breathing spectrum. The method determines a respiratory rate of a user in the geographical region from the subset of the FFT data.

    Establishing communication links to assist headless devices
    12.
    发明授权
    Establishing communication links to assist headless devices 有权

    公开(公告)号：US12273807B1

    公开(公告)日：2025-04-08

    申请号：US18138912

    申请日：2023-04-25

    Applicant: Amazon Technologies, Inc.

    Inventor： QingYun Wei ,  Zhao Lou ,  Shao-Cheng Wang ,  Avinash Joshi ,  Xi Chen

    IPC: H04W48/14 ,  H04L67/02 ,  H04L67/56 ,  H04W4/80 ,  H04W12/06 ,  H04W76/12 ,  H04W76/15 ,  H04W84/12

    Abstract: Techniques for establishing connections between user devices and headless devices attempting to connect to networks. A headless device may attempt to connect to an access point that requires interaction with a captive portal webpage for access to a network. However, the headless device my lack a display to present the captive portal webpage. The headless device may establish a connection with a user device using a PAN protocol. The headless device may then receive the captive portal webpage received from the access point, and relay the webpage to the user device using the PAN protocol. A user may use the user device to interact with the captive portal webpage, and the user device may then relay interaction data back to the headless device using the PAN protocol. The headless device may then provide that interaction data to the access point to be provided access to the network.

    Establishing data channels between user devices and remote systems
    13.
    发明授权
    Establishing data channels between user devices and remote systems 有权

    公开(公告)号：US11595804B1

    公开(公告)日：2023-02-28

    申请号：US16884992

    申请日：2020-05-27

    Applicant: Amazon Technologies, Inc.

    Inventor： Zhao Lou ,  QingYun Wei ,  Shao-Cheng Wang ,  Avinash Joshi ,  Zhen Xie ,  Xi Chen

    IPC: H04W8/00 ,  H04L67/51 ,  H04L69/16 ,  H04W4/20 ,  H04W4/80 ,  H04W84/12

    Abstract: Techniques for establishing communication channels between user devices experiencing network connectivity issues and remote communication systems are described herein. The techniques include the use of a secondary device to act as a proxy, or a “middle man,” to facilitate the communications with the user device. A user device may detect lack of network connectivity, and begin broadcasting advertisement messages that indicate the lack of connectivity. A secondary device may detect the advertisement message, and send a discovery message to a connectivity system indicating that it detected the advertisement message. The connectivity system can provide this information to a remote communication system, and the remote communication system can establish a connection with the secondary device and instruct the secondary device to establish a connection with the user device. The remote communication system then has a communication channel with the user device, using the secondary device, to troubleshoot the user device.

    Route discovery in wireless mesh networks
    14.
    发明授权
    Route discovery in wireless mesh networks 有权

    公开(公告)号：US10588069B1

    公开(公告)日：2020-03-10

    申请号：US15801732

    申请日：2017-11-02

    Applicant: Amazon Technologies, Inc.

    Inventor： Xi Chen ,  Ashish Kumar Shukla ,  Avinash Joshi ,  Qiang Hu

    IPC: H04W40/04 ,  H04L12/721 ,  H04L12/875 ,  H04W84/18

    Abstract: A method of route discovery in wireless mesh networks comprises: receiving, by a first mesh network device of a wireless mesh network, from a second mesh network device of the wireless mesh network, a first route request identifying a destination mesh network device of the wireless mesh network and a first path selection metric value; determining a path selection metric increment, wherein the path selection metric increment reflects a radio channel contention by the first mesh network device and the second mesh network device; generating a second path selection metric value by adding the path selection metric increment to the first path selection metric value; and broadcasting a second route request identifying the destination mesh network device and the second path selection metric value.

    Proximity detection using device-to-device communication links
    18.
    发明授权
    Proximity detection using device-to-device communication links 有权

    公开(公告)号：US11510028B1

    公开(公告)日：2022-11-22

    申请号：US17350839

    申请日：2021-06-17

    Applicant: Amazon Technologies, Inc.

    Inventor： Qinghai Gao ,  Qiang Hu ,  Avinash Joshi ,  Piyush Tayal ,  QingYun Wei ,  Xiaofu Ma

    IPC: H04W4/02 ,  H04W76/15 ,  H04W84/12

    Abstract: Techniques for performing high-precision presence detection by establishing and monitoring peer-to-peer communication links between user devices residing in a same physical environment. A user device that resides in the environment may establish communication links with multiple other user devices residing in the environment. The user device may monitor the channel properties for those communication links to detect fluctuations in the channel properties caused by a user moving through a signal of the communication links. In examples where the user device detects fluctuations in channel properties for multiple communication links, the user device may determine that the user had moved though signals of the communication links. The user device may determine that, because the user moved through signals of multiple communication links, the user may be in close proximity to the user device, such as in the same room. Thus, the user device monitors multiple communication links to perform presence-detection techniques.

    Managing access of a computing device to a network
    19.
    发明授权
    Managing access of a computing device to a network 有权

    公开(公告)号：US11284258B1

    公开(公告)日：2022-03-22

    申请号：US16452193

    申请日：2019-06-25

    Applicant: Amazon Technologies, Inc.

    Inventor： QingYun Wei ,  Andrew Roths ,  Avinash Joshi

    IPC: H04W12/08 ,  H04L29/06 ,  H04L9/08 ,  H04W12/06 ,  H04W84/12

    Abstract: Techniques for connecting computing devices to a network are described. For example, a network access device (NAD) connects to a first network that includes a first access point (AP). The NAD receives, from a computing device, first data identifying a second network to be established for the computing device and sends the first data to a server. The NAD receives back a first credential associated with access to the second network and sets up a second AP to the second network. The second AP is associated with the first credential. The NAD sends, to the computing device, second data indicating that access to the second network is available, generates a second credential associated with access to the first network via the first AP, and sends the second credential to the computing device via the second AP.

    Multicast traffic management
    20.
    发明授权
    Multicast traffic management 有权

    公开(公告)号：US11082808B1

    公开(公告)日：2021-08-03

    申请号：US16530289

    申请日：2019-08-02

    Applicant: Amazon Technologies, Inc.

    Inventor： Ashish Kumar Shukla ,  Avinash Joshi ,  Binh Tran

    IPC: H04L12/66 ,  H04W4/06 ,  H04W72/04 ,  H04L12/18

    Abstract: Techniques are described for an unbuffered multicast delivery mode representing the capability of transmitting a multicast frame within a same DTIM interval during which the multicast frame is received. In an example, a network access device determines that a first computing device is in a power saving mode. The network access device receives, during a DTIM interval while the first computing device is in the power saving mode, a multicast frame destined to a multicast MAC address. The network access device determines an association between the multicast MAC address and a device MAC address of a second computing device. The network access device sends, during the DTIM interval and based on the association, the multicast frame to the second computing device.

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