Slow clock crystal frequency compensation method and device for mobile communication terminal

Abstract

The invention relates to a slow clock crystal frequency compensation method and a slow clock crystal frequency compensation device for a mobile communication terminal. The method comprises the following steps of: entering an idle mode; judging a previous mode before entering the idle mode; acquiring a calibration parameter if the previous mode is a normal working mode; calculating slow clock crystal frequency; and if the previous mode is a sleep mode, firstly acquiring synchronism deviation, then judging whether the synchronism deviation is in a set threshold value, if the synchronism deviation is in the set threshold value, compensating the slow clock crystal frequency, and otherwise, forcibly calibrating the slow clock crystal frequency; the device comprises a forcible calibration unit, a synchronism deviation unit, a correction and calibration unit and a power-saving control unit; accurate sleep timing is guaranteed and a system does not fall out of step after being awakened without increasing the circuit complexity and terminal hardware cost, and starting of a clock calibration unit to the minimum extent is also guaranteed, so that the sleep time is maximized when the mobile communication terminal is in the idle mode, and the power consumption of the mobile communication terminal is reduced.

Description

technical field [0001] The present invention relates to mobile communication terminal (referred to as UE) technology, in particular to a mobile communication terminal slow clock crystal frequency compensation method and device. Background technique [0002] According to the different service types of the UE, the working state of the UE can be divided into three types: normal working mode, idle mode and sleep mode. The normal working mode means that the UE performs normal business processing; the idle mode means that the UE is in an idling state with no business, and regularly receives paging information (PICH for short) from the network side in each paging cycle (DRX for short); Mode refers to the power-saving mode in which each module of the UE enters low power consumption or turns off the high-frequency clock and voltage domain. The switching between the three states is as follows: figure 1 As shown, in the normal working mode, the service is completed, and the UE enters ...

AI Technical Summary

Problems solved by technology

The following problems also exist when using this solution to reduce the number of times to start the clock calibration unit: 1. Increase the cost of the entire mobile terminal; 2. When the cumulative drift of the ambient temperature in multiple DRX cycles exceeds the maximum temperature difference threshold corresponding to the synchronization guarantee value, still need to start the calibration parameter unit; 3. This device cannot solve the problem of crystal aging rate. With the increase of use time, the corresponding parameters of crystal frequency and temperature drift need to be re-tested

Images