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    Techniques for switching communication channels
    12.
    发明授权
    Techniques for switching communication channels 有权

    公开(公告)号：US11621992B1

    公开(公告)日：2023-04-04

    申请号：US17132252

    申请日：2020-12-23

    Applicant: Amazon Technologies, Inc.

    Inventor： Ravi Ichapurapu ,  Sameet Ramakrishnan ,  Shao-Cheng Wang ,  Qinghai Gao

    IPC: H04L65/80 ,  G06F3/16 ,  H04W36/06

    Abstract: This disclosure describes, in part, techniques for switching between communication channels in order to reduce latency of data transmissions. For instance, an electronic device may establish a first network connection with a network device and second network connection(s) with other electronic device(s). The electronic device may then send data received from the network device to the other electronic device(s). In some circumstances, the electronic device may establish a new network connection with the network device, such as on a different communication channel and/or use a different network band. In such circumstances, the electronic device may use one or more techniques to establish new network connections(s) with the other electronic device(s) in order to reduce the latency it takes to send the data received from the network device to the other electronic device(s).

    Channel state information (CSI) sensing in the 2.4 GHz band
    13.
    发明授权
    Channel state information (CSI) sensing in the 2.4 GHz band 有权

    公开(公告)号：US11616553B1

    公开(公告)日：2023-03-28

    申请号：US17590661

    申请日：2022-02-01

    Applicant: Amazon Technologies, Inc.

    Inventor： Amit Kachroo ,  Durga Laxmi Narayana Swamy Inti ,  Ravi Ichapurapu

    IPC: H04B7/06 ,  H04L5/00

    Abstract: Technologies directed to channel state information (CSI) sending in the 2.4 GHz band are described. A method includes receiving first CSI data representing channel properties of a wireless channel used by first and wireless devices that operates in the 2.4 GHz band. The method generates CSI samples at a first sampling rate. If the method determines that a first value, representing quality of the CSI samples, satisfies a threshold criterion, the method generates second CIS samples at a second higher sampling rate while alternating between each of multiple wireless channels in the specified amount of time. The method determines a score for each channel subcarrier index of a set of channel subcarrier indexes using the second CSI samples and identifies a subset based on the score. Using the second CSI samples corresponding to the subset, the method determines a motion condition or a no-motion condition within a geographical region.

    Network channel selection for device with co-located radio transmitters and receivers
    16.
    发明授权
    Network channel selection for device with co-located radio transmitters and receivers 有权

    公开(公告)号：US11452110B1

    公开(公告)日：2022-09-20

    申请号：US15837790

    申请日：2017-12-11

    Applicant: Amazon Technologies, Inc.

    Inventor： Milos Jorgovanovic ,  Ravi Ichapurapu ,  Morris Yuanhsiang Hsu ,  Ateet Kapur ,  Pratik Kalpesh Patel ,  Latha Srinivasan

    IPC: H04W72/08 ,  H04W72/04 ,  H04W72/02 ,  H04W4/80 ,  H04W76/10

    Abstract: A system and method for network channel selection is provided. A device includes WIFI, ZIGBEE, and BLUETOOTH communication controllers. The device's processor is configured to determine, using the communication controllers, a WIFI channel designated for communications and a first set of ZIGBEE channels designated for communications. The processor is configured to determine that a number of available BLUETOOTH channels that do not overlap the WIFI channel or any in-use ZIGBEE channels is less than a threshold number of BLUETOOTH channels required for communication using a BLUETOOTH protocol. The processor then determines the WIFI channel has a minimum duty cycle from among duty cycles of the WIFI channel and each ZIGBEE channel, determines a first BLUETOOTH channel that at least partially overlaps the WIFI channel, and causes the BLUETOOTH communication controller to transmit data using the first BLUETOOTH channel.

    Network communications for device with co-located radio transmitters and receivers
    17.
    发明授权
    Network communications for device with co-located radio transmitters and receivers 有权

    公开(公告)号：US11122519B1

    公开(公告)日：2021-09-14

    申请号：US16216445

    申请日：2018-12-11

    Applicant: Amazon Technologies, Inc.

    Inventor： Ravi Ichapurapu ,  Morris Yuanhsiang Hsu ,  Sameet Ramakrishnan ,  Duck Ho Bae

    IPC: H04W52/20 ,  H04W52/24 ,  H04W4/80 ,  H04W72/04 ,  H04W88/12 ,  H04W84/12

    Abstract: An electronic device includes a first communication controller and a second communication controller. The first and second communication controller are configured to communicate wirelessly using respective antennas. The electronic device includes a processor that is configured to execute instructions for determining that the first controller is transmitting a first radio frequency signal, and setting a transmit power of the first controller to a first transmit power value. The processor is configured to execute instructions for determining a duty cycle of the first controller is greater than a packet loss threshold associated with the second controller, and setting the transmit power of the first controller to a second transmit power value. The second transmit power value is less than the first transmit power value.

    Dynamic selection between receiver paths to control receiver gain
    19.
    发明授权
    Dynamic selection between receiver paths to control receiver gain 有权

    公开(公告)号：US10931324B1

    公开(公告)日：2021-02-23

    申请号：US16851792

    申请日：2020-04-17

    Applicant: Amazon Technologies, Inc.

    Inventor： Ravi Ichapurapu ,  Basak Oyman

    IPC: H04B17/00 ,  H04B1/16

    Abstract: Techniques for a communication device with a receiver to dynamically control the gain of an analog front end of the receiver. Rather than having a single circuit path in the analog front end, the analog front end includes multiple circuit paths, and dynamically selects one of the circuit paths that optimizes the gain of the analog front end. For example, an amplifier circuit path may be selected to amplify the power level of the signal received from the antenna. However, the analog front end may further include an attenuator circuit path that includes an attenuator to reduce the power level of a high-power input signal received from the antenna to ensure that the high-power signal is attenuated below a power level associated with saturation of the receiver.

    Mitigating thermal increases in electronic devices
    20.
    发明授权
    Mitigating thermal increases in electronic devices 有权

    公开(公告)号：US10725531B1

    公开(公告)日：2020-07-28

    申请号：US15980393

    申请日：2018-05-15

    Applicant: Amazon Technologies, Inc.

    Inventor： Ravi Ichapurapu ,  Sameet Ramakrishnan

    IPC: G06F1/3287 ,  H04N21/443 ,  G06F1/3206

    Abstract: Systems, methods, and computer-readable media are disclosed for mitigating thermal increases in electronic devices. Example devices may include memory and at least one processor configured to access the memory and execute computer-executable instructions to determine that a temperature of the device satisfies a first threshold, send a notification to an access point communicatively coupled to the device indicating that the device will enter a sleep state for a length of time, and cause the device to enter the sleep state. Certain embodiments may be configured to cause the device to enter an awake state after the length of time, determine that the temperature satisfies a second threshold, and determine that a period of time has elapsed. Some embodiments may be configured to determine that a first bandwidth mode is active at the device, and cause a second bandwidth mode to be activated at the device.

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