公开(公告)号：US20210258730A1

公开(公告)日：2021-08-19

申请号：US16972998

申请日：2018-06-07

Applicant: Huawei Technologies Co., Ltd.

Inventor： Weiqing FANG ,  HSIENYANG LU ,  Donghao ZHANG ,  Yankun LUO ,  Zhongyan CHAI ,  Chen LIU ,  Jie MA

IPC: H04W4/029 ,  H04L29/08 ,  G01S19/01

Abstract: A method for tracking a terminal device having a cellular modem and a positioning module is disclosed. The method comprises monitoring a location of a terminal device through a cellular network using the cellular modem of the terminal device, while the positioning module of the terminal device is disabled; determining that the terminal device enters a first cell of the cellular network based on signals from the cellular modem; enabling the positioning module of the terminal device in response to the determination that the terminal device enters the first cell; and obtaining from the positioning module a first geographical location of the terminal device in the first cell.