Method for searching GSM (Global System for Mobile Communications) adjacent zone by dual-mode terminal and dual-mode terminal

Abstract

The invention discloses a method for searching a GSM (Global System for Mobile Communications) adjacent zone by a dual-mode terminal and a dual-mode terminal, belonging to the field of communications. The method comprises the following steps of: receiving an FCCH (Frequency Correction Channel) signal of GSM by using an idle time slot of a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) subframe, calculating the position of an SCH (Synchronization Channel) signal sent by a network side for the second time in the TD-SCDMA subframe after the FCCH signal is received according to a possible frame number difference N between SCH signals sent in adjacent two times by the network side, and receiving by using the idle time slot of the TD-SCDMA subframe. The time slot resource is fully utilized under the premise of ensuring the functions of TD-SCDMA service. Because one RF (Radio Frequency) chip is used for receiving TD-SCDMA and GSM RF in time division, the mutual interference between two RF is avoided, and moreover, the quantity of used chips can be greatly reduced. A significant cost is saved, and power consumption is lower.

Description

Technical field [0001] The present invention relates to the communication field, and particularly relates to the GSM neighborhood search technology in the communication field. Background technique [0002] With the continuous development of communication technology, various types of wireless communication systems have emerged, such as the Global System for Mobile communication (GSM) and Wideband Code Division Multiple Access (Wideband Code Division Multiple Access). WCDMA"), Time Division Synchronous Code Division Multiple Access (TD-SCDMA"), Worldwide Interoperability for Microwave Access (WiMAX), Long Term Evolution (LongTerm Evolution, abbreviated as "WiMAX") "LTE"), Bluetooth, China Mobile Multimedia Broadcasting ("CMMB") and so on. [0003] At present, many terminals (such as mobile phones) can support two wireless systems (or wireless standards), such as supporting both GSM and TD-SCDMA. This kind of terminal that supports two wireless systems is usually called a dual-mode ...

AI Technical Summary

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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