Method for reelecting/switching 2G mode into 3G mode and dual-mode single-standby terminal device

Abstract

The invention discloses a method for reelecting / switching a 2G mode into a 3G mode and a dual-mode single-standby terminal device, and ensures that a dual-mode single-standby terminal working in the 2G mode without any configured 3G adjacent area can also be reelected and switched to the 3G mode, thereby reducing the power consumption of the terminal. The technical scheme is as follows: the method comprises the following steps: a dual-mode single-standby terminal works in the 2G mode without any configured 3G adjacent area, triggers the search of a 3G signal under the condition of meeting theset condition; the search process of the 3G adjacent area is carried out, once the fact that the signal strength of a certain frequency point is higher than the switch threshold of a corresponding frequency point is measured, the search is paused; the system information of the 3G adjacent area of the frequency point is read in advance, whether the 3G adjacent area meets the conditions for residing and registering is judged, and each frequency point corresponds to one switch threshold; if the 3G adjacent area meets the conditions, the reelection / switching of the 2G mode into the 3G mode is carried out, and otherwise, the measurement of the follow-up frequency points is continually carried out; and the corresponding switching threshold of the frequency point is adjusted according to the fact that whether the reelection / switching is successful. The invention is applied to the field of mobile communication.

Description

technical field [0001] The invention relates to a communication mode reselection / switching method, in particular to a 2G to 3G mode reselection / switching method and a dual-mode single-standby terminal device applying the method. Background technique [0002] In order to realize the smooth transition between 2G and 3G, a dual-mode mobile phone that supports both 3G and 2G standards is an inevitable choice. Here mainly take the TD-SCDMA / GSM / GPRS dual-mode terminal as an example for description. [0003] In the existing TD-SCDMA / GSM / GPRS dual-mode terminal, a timer T1 is added to the access layer module of the GSM / GPRS mode, and a memory is added to store the threshold value Pt of the TD cell. If the system information does not contain TD cell information, then the GSM module will start a timer T1, and only when the timer expires, the terminal will start to search for TD cells in the full frequency band; if the signal strength of any TD cell is greater than the set threshold ...

AI Technical Summary

Problems solved by technology

[0005] (1) The timer T1 to start the TD test is fixed, so there are two problems: one is that if T1 is selected to be relatively short, then once it times out, the full-band search will be performed every time, which consumes more power; if T1 is set longer , then when the current GSM signal is relatively poor, the measurement is not started in time, and the reselection is not timely

The other is that the fixed settings are not flexible enough

[0006] (2) When searching for 3G signals in the whole frequency band, the service initiated by the user will fail until the search is over, and the user experience is not good

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