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随着对带宽需求的增加,通信技术的发展一度出现2.5G和2.75G的中间过渡代。当3G移动业务刚刚迈出脚步,就出现了支持语音、数据和视频三种格式的传输技术高速下行链路分组接入技术。与此同时,真正意义上的宽带数据速率标准4G概念也开始出现,它包括宽带无线固定接入、宽带无线局域网、移动宽带系统、互操作的广播网络和卫星系统等,将是多功能集成的宽带移动通信系统,也是宽带接入IP系统。
With the increasing demand for bandwidth, the development of communications technology once appeared 2.5G and 2.75G intermediate transition generation. When the 3G mobile service just took a step forward, a high-speed downlink packet access technology supporting transmission technologies of voice, data and video emerged. In the meantime, the true 4G concept of broadband data rate standards, including broadband wireless fixed access, broadband wireless LANs, mobile broadband systems, interoperable broadcast networks and satellite systems, will be multi-purpose integrated Broadband mobile communication system, but also broadband access IP system.