公开(公告)号：US20190250265A1

公开(公告)日：2019-08-15

申请号：US15897678

申请日：2018-02-15

Applicant: ABL IP HOLDING LLC

Inventor： Yenpao LU ,  Min-Hao Michael LU ,  Michael MIU

IPC: G01S13/56 ,  G01S13/00

Abstract: The disclosure provides an example of a system including a radio frequency (RF) wireless communication network (network) including a plurality of nodes in an area and a computer coupled to the network. Each of the nodes includes a transmitter and a receiver. At plurality of times, each transmitter transmits RF spectrum signals (signals) and each receiver receives the signals and also generates an indicator data of a signal characteristic of the received signal propagated in the network. When each time among the plurality of times is a current time, the computer obtains the indicator data of the signal, determines a modification in the indicator data at the current time from the indicator data at a preceding time due to a movement of an occupant in the area and detect an occupancy condition in the area based on the modification in the indicator data and a parameter of a configuration of the network.