公开(公告)号：WO2020145949A1

公开(公告)日：2020-07-16

申请号：PCT/US2019/012793

申请日：2019-01-08

Applicant: GOOGLE LLC

Inventor： SHIN, Dongeek ,  WEN, Yu ,  HAYES, Raymond Reynolds ,  CAI, Zhifeng ,  SILVERSTEIN, Brian Mitchell ,  HAYES, Kevin N.

IPC: H04W4/70 ,  H04W4/02 ,  H04L29/08 ,  H04W4/50 ,  H04W4/20 ,  G08B13/24

Abstract: This document describes techniques and devices to detect and classify human and animal presence and/or motion based on changes in the interaction of the human or animal with Wireless Local Area Network (WLAN) radio frequency (RF) signals within or about a building structure, such as a home or office. A first WLAN device transmits a sounding packet to a second WLAN device and receives an acknowledgement (ACK) of receiving the sounding packet by the second WLAN device. The first WLAN device uses the received ACK to determine Channel State Information (CSI) for an RF signal path between the first WLAN device and the second WLAN device, aggregates the determined CSI with additional CSI, and uses the aggregated CSI to determine a presence or a motion within the structure.

公开(公告)号：WO2022174215A1

公开(公告)日：2022-08-18

申请号：PCT/US2022/070528

申请日：2022-02-04

Applicant: GOOGLE LLC

Inventor： WEN, Yu ,  CAI, Zhifeng ,  DUVVURI, Srinivasa Kumar ,  HAYES, Raymond Reynolds ,  HAYES, Kevin N. ,  WU, Der-Woei

IPC: H04W28/02 ,  H04W40/22

Abstract: This document describes improvements in range and reliability for wireless mesh networks implementing IEEE 802.11 networking technologies. Reducing the number of spatial streams, N, to a lower value at middle and far distance ranges using an optimized rate control algorithm, preemptively trades off a lower throughput limit for a higher link budget. This higher link budget provides longer range and higher RF link reliability by using an NxN spatial diversity of MIMO RF channels for maximizing link budget instead of network throughput.