The cellular digital packet data(CDPD) system is a wireless packet communication system based on analog cellular telephone networks.
蜂窝数字分组数据（CDPD）系统是基于模拟蜂窝电话网的无线分组数据通信系统。
In wireless packet networks, because we need radio to receive or send data, so a basic problem is how to attach radio protocol to DTE's data link layer and assure communication running well.
无线分组网中，由于需要利用电台收发数据，于是在DTE的数据链路层中加入电台协议，保证DTE与电台的通信正常进行是需要解决的基本问题。
This part USES GPRS (General Packet Radio Service) Which is a long-distance wireless communication technology to be responsible for data to upload the host computer and receive control commands.
此部分采用的是GPRS(通用分组无线业务)这种长距离无线通信技术来负责数据的上传以及接收上位机的控制命令。
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