- 经验
- 39988
- 分贝
- 0
- 家园分
- 81451
- 在线时间:
- 4517 小时
- 最后登录:
- 2024-3-27
- 帖子:
- 38828
- 精华:
- 0
- 注册时间:
- 2016-5-5
- UID:
- 1246426
注册:2016-5-52933
|
发表于 2018-4-20 13:41:12
|显示全部楼层
越祈 发表于 2018-4-20 11:15
这个其实上没有明确的分法的,我是把B1也算中频的(因为中频漏缆一般截止到2200),这样就变成
低频: ...
Spectrum for third generation IMT-2000 systems
Experts from the key players of the mobile industry taking part in the work of the IMT-2000 group recommended the bands 1 to 3 GHz as the most suitable for IMT-2000. This conclusion was endorsed by the World Radiocommunication Conference of 1997 in its Resolution on the implementation of IMT-2000 (Resolution 212). The same Resolution also called upon administrations which implement third generation IMT-2000 systems to use those frequency bands 1 885-2 025 MHz and 2 110-2 200 MHz.
The estimation of a minimum requirement of about 230 MHz was the basis for the WARC-92 decision to identify spectrum in the bands (1 885-2 025 MHz and 2 110-2 200 MHz). At the time, voice services were considered to be the major source of traffic, and only low data rate services were additionally considered. Usage of the mobile services has increased substantially since 1992 and, along with the growing demand for megabit data rates, have overtaken the estimations of that time. |
|