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介绍了 2G (第二代移动通信 )系统向 3G (第三代移动通信 )系统演进过程中出现的两种过渡方案HSCSD (高速电路交换数据业务 )与GPRS (通用分组无线业务 ) ,并介绍了两者在网络结构及所提供业务方面的异同点。它们以不同的方式提供高速、灵活的多速率业务 ,具有较好的发展前景。
Introduced two transition schemes HSCSD (High Speed Circuit Switched Data Service) and GPRS (General Packet Radio Service) which appeared during the evolution from 2G (second generation mobile communication) system to 3G (third generation mobile communication) system and introduced The similarities and differences between the two in terms of network structure and services offered. They provide high-speed, flexible multi-rate services in different ways, with good development prospects.