中国第四代移动通信技术(4G)的研发已经在上海启动。日前，阿尔卡特公司亚太地区首个“研究与创新中心”在沪成立，4G成为该中心第一阶段重点攻关的项目。目前，国内手机用户仍以使用2G手机(GSM手机)居多。中国移动的2.5G (GPRS)刚刚开通数月，中国联通的2.5G网络(CDMA 1x)还在 China’s fourth generation mobile communication technology (4G) research and development has started in Shanghai. Recently, Alcatel-Asia Pacific’s first “Research and Innovation Center” was set up in Shanghai and 4G became a key project of the first phase of the center. Currently, domestic mobile phone users still use 2G mobile phones (GSM mobile phones) mostly. China Mobile 2.5G (GPRS) has just opened a few months, China Unicom’s 2.5G network (CDMA 1x) is still