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在GSM(Global System for Mobile Comunication,简称GSM，全球移动通讯系统)向第三代移动通信(3G)发展的过程中，逐步引入新设备，开发新业务，最大限度地充分利用原有GSM网络的设备，并最终演进成为3G移动通信系统，这就是3G演进的一系列过程。下面，首先讨论GSM向3G演进时需?
In the course of the development of the third generation mobile communication (3G) by the Global System for Mobile Comunication (GSM), the gradual introduction of new equipment and development of new services to maximize the use of existing GSM networks Equipment, and eventually evolved into 3G mobile communication system, which is a series of 3G evolution process. The following, first discuss the evolution of GSM to 3G required?