２１世纪的移动电话网随着移动电话和寻呼机的日益普及，可供使用的电信资源也越发捉襟见肘。因此，１９９５年新年伊始，日本邮政省就提出了一个大胆的试验计划，即将传送电视信号的电波频率带的“空白地带”应用于移动电话通信，并计划在２１世纪推广使用。计划中的移动... The 21st Century Mobile Phone Network With the increasing popularity of mobile phones and pagers, available telecommunications resources are also increasingly stretched. Therefore, at the beginning of the new year in 1995, Japan’s Ministry of Post and Telecommunications put forward a bold experimental plan to apply the “blank space” of the radio frequency band for transmitting television signals to mobile phone communications and plan to promote it in the 21st century. Planned move ...