timeliness

As one kind of finite nature resource being shared by human, radio frequency spectrum have the three-dimensional characteristic of the extensity, timeliness and frequency, but it is not be restricted with terrain, airspace and time.

无线电频谱作为一种人类共享的有限自然资源，具有空间、时间和频率的三维特性，又不受地域、空域、时域的限制。

Beginning with the PROFIBUS field bus access protocol, this paper studies the time of data transmission of survey controlling system, and obtains two conclusions of increasing the timeliness of the field bus through the way of analyzing the survey controlling cycle of the single master station.

从PROFIBUS现场总线的存取协议出发，着重研究测量控制系统的数据传输时间并从单主站的测量控制周期的分析中得出了提高现场总线实时性的两个结论。

When networking communication with frequency hopping technology, there exists many problems caused by the collision conflict, the longer network time, address conflicting, and timeliness reduces.

使用跳频技术进行网络通信时，碰撞冲突会导致组网时间过长、地址容易冲突、实时性降低等问题。