A mobile communication terminal slow clock crystal frequency compensation method and device

Abstract

The present invention relates to a mobile communication terminal slow clock crystal frequency compensation method and device. The method enters the idle mode, and judges the previous mode that enters the idle mode. If the previous mode is the normal working mode, obtains the calibration parameters and calculates the slow clock Crystal frequency; if the previous mode is sleep mode, first obtain the synchronization deviation, and then judge whether the synchronization deviation is within the set threshold value, if so, then compensate the slow clock crystal frequency, otherwise carry out forced calibration of the slow clock crystal frequency; The above device includes a mandatory calibration unit, a synchronization deviation unit, a correction calibration unit and a power saving control unit; the present invention ensures accurate sleep timing and no out-of-sync system after wake-up without increasing circuit complexity and terminal hardware cost, and It also ensures the minimum start-up clock calibration unit, which maximizes the sleep time of the mobile communication terminal in idle mode and reduces the power consumption of the mobile communication terminal.

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

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