第二代移动通信系统(2g)是数字移动系统，能提供低速率数据业务。
Second generation mobile communication system (2g) is digital cellular system which can provide low-speed data business.
它是支持多媒体业务传输的基础，也是与第二代移动通信系统的重要区别之一。
This scheme is the basis of supporting multimedia services, while it also causes high complexity and long process delay.
研究第二代移动通信系统向第三代移动通信系统的演进，深入研究WCDMA的网络体系结构及其接口规范。
Research the evolution of the mobile telecommunication system from 2g to 3g, the network architecture and interface specifications of WCDMA.
研究第二代移动通信系统向第三代移动通信系统的演进，深入研究WCDMA的网络体系结构及其接口规范。
Research the evolution of the mobile telecommunication system from 2g to 3g, the network architecture and interface specifications of WCDMA.
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