摘要
IMF-2000是国际电联提出的一个全球覆盖的、具有高度智能和个人服务特色的移动通信网.它容纳了不同的系统和终端,具有世界统一的频率并提供比第二代系统更加先进的分组数据和多媒体业务.IMF-2000基于ITU-T Q.1200建议和ITU-T M.300建议,在不同网络间提供最大程度的互通.利用自适应软件可下载终端来支持多频段、多环境能力;关键参数可按需选择,再加上更高的频谱利用率,该系统特别适合于发展中国家的需求.虽然具有上述特点,此系统也面临挑战:如何保护已有的用户基础和系统投资;是采用革命性策略还是采用渐进性策略以及如何使网络模块化等都有待于进一步解决.
IMF-2000 which is introduced by ITU-R is a global, highly intelligent and personal service featured mobile telecommunication network. It accommodates different systems and terminals, has a universal frequency, provides more advanced packet data as well as multimedia services than the second generation system. IMF-2000 is based on ITU-T Q. 1200 recommendations and ITU-T M. 300 recommendations , offering greatest interworking among different networks. With self-adaptive software, it can download terminals to support multiband, polyenviro-mental functions. The key parameters can be selected on demand, together with higher utilization of spectrum, so that this system is particularly adaptive to the need of developing countries. While bearing these features above, there are some challenges the system is confronted with: how to protect existent user base and system investment, whether to adopt revolutionary or gradual strategy, and how to realize network modularization-all waiting to be resolved.
出处
《现代电信科技》
1998年第3期1-3,共3页
Modern Science & Technology of Telecommunications
