Global system for mobile communication (GSM) neighbor cell searching method for dual-module terminal and dual-module terminal

Abstract

The invention relates to the field of communication and discloses a GSM neighbor cell searching method for a dual-module terminal and the dual-module terminal. In the invention, the dual-module terminal of a time division synchronous code division multiple access (TD-SCDMA) mode opens a GSM neighbor cell searching function when the predetermined conditions are met, which means receiving GSM frames continuously in a predetermined frame number and pausing the receiving of TD-SCDMA sub-frames until a frequency correction channel (FCCH) of the GSM is detected; and computing the position of a synchronous channel synchronization channel (SCH) signal in the next frame according to the position of the FCCH signal in the GSM frame, receiving the SCH signal and completing the GSM neighbor cell searching. In the invention, under the condition of guaranteeing small influences on the TD-SCDMA service performance, the TD-SCDMA and GSM radio frequency (RF) receiving is completed by an RF chip, so that a great amount of cost is saved, and power consumption is low.

Description

technical field [0001] The invention relates to the communication field, in particular to the GSM neighbor cell search technology in the communication field. Background technique [0002] With the continuous development of communication technology, various types of wireless communication systems have appeared, such as Global System for Mobile communication (Global System for Mobile communication, referred to as "GSM"), Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, referred to as " WCDMA"), Time Division Synchronous Code Division Multiple Access (TD-SCDMA for short), Worldwide interoperability for Microwave Access (WiMAX for short), Long Term Evolution (LongTerm Evolution, short for "LTE"), Bluetooth, China Mobile Multimedia Broadcasting ("CMMB" for short), etc. [0003] At present, many terminals (such as mobile phones) can support two kinds of wireless systems (or wireless standards), such as supporting both GSM and TD-SCDMA. Such a termi...

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Problems solved by technology

[0005] Yet the inventor of the present invention finds, adopts the scheme of double RF to carry out the neighbor cell search of GSM, promptly carries out BSIC VERIFY (base station identification code check) to GSM neighbor cell, although can guarantee that dual-mode function does not affect TD-SCDMA service, but introduces many other technical issues

For example, whether one DSP is selected to implement TD-SCDMA / GSM dual-mode processing, or two DSPs are used to process TD-SCDMA and GSM channels separately, the number of chips will increase, and the interference between the two RFs must be eliminated. High power consumption, etc.

Moreover, if one DSP is selected to implement TD-SCDMA / GSM dual-mode processing, it will also increase the difficulty of RF and Memory (memory) scheduling; if two DSPs are used to process TD-SCDMA and GSM channels separately, the cost will be higher

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