公开(公告)号：US11894902B1

公开(公告)日：2024-02-06

申请号：US18102011

申请日：2023-01-26

Applicant: Amazon Technologies, Inc.

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

IPC: H04B7/06 ,  H04L5/00

CPC classification number: H04B7/0626 ,  H04B7/0639 ,  H04L5/0062 ,  H04L5/0098

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 first wireless channel used by first and wireless devices that operates in the 2.4 GHz band. The method receives second and third CSI data corresponding to second and third wireless channels. The method determines an inference probability of a motion or a non-motion condition in the geographical region based on an average probability of CSI samples from the first, second, and third CSI data.

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.

公开(公告)号：US11553416B1

公开(公告)日：2023-01-10

申请号：US17387719

申请日：2021-07-28

Applicant: Amazon Technologies, Inc.

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

IPC: H04W52/02

Abstract: Technologies directed to dynamic memory reallocation and offload channel state information (CSI) processing for device power savings are described. A method includes receiving, by a radio, first data from a processing device. The first data is sent to a second wireless device over a wireless channel. The method measures, by the radio, first CSI values that represent channel properties of the wireless channel. The method sends, by the radio, the first CSI values to the processing device with a first periodicity. The method receives, by the radio from the processing device, second data that specifies a transfer interval and an amount of memory to reserve in a memory buffer for second CSI values measured during the transfer interval. The method measures, by the radio, the second CSI values and sends the second CSI values to the processing device at the end of the transfer interval.