公开(公告)号：US20210270974A1

公开(公告)日：2021-09-02

申请号：US16803410

申请日：2020-02-27

Applicant: QUALCOMM Incorporated

Inventor： Philip CRARY ,  Troy LI ,  Scott SCIGLIANO

IPC: G01S19/25 ,  G01S19/24 ,  G01S19/23 ,  G01S19/29 ,  G01S19/05 ,  G06F1/3203 ,  H01C7/00

Abstract: System and method for adjusting timing error in a mobile device. In the mobile device, a crystal oscillator (XO) is used by a system timer as the timing source. When the mobile device enters into a sleep mode, the system timer is set to time the duration of the sleep mode. During the sleep mode, a thermistor is used to measure and monitor the temperature changes of the XO. After the sleep mode is over, a processor in the mobile device determines the frequency changes of the XO based on the temperature changes of the XO. Based on the frequency changes of the XO, the processor determines the timing error that may have occurred when the system timer was timing the sleep mode and determines the actual duration of the sleep mode by adjusting the duration timed by the system timer based on the timing error.