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。
Therefore, this paper analyzes the feature of 3G wireless packet data services on the basis of current data service models and introduces some typical packet data service models.
对未来3G无线分组数据业务的特性进行了分析，给出了若干典型的无线分组数据业务模型。
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。
The research of the subject involves telecommunication technologies such as packet data communication, network designation, mobile location, and wireless networks technology.
本课题研究主要涉及通信领域的分组数据通信、无线接入、系统组网、移动定位等技术。
High speed packet data transmission with high reliability is the most promising direction for the future wireless communications.
高数据速率、高可靠性的分组数据传输将成为未来无线通信的主流。
Using traditional transmission power control mechanism in data link layer of wireless AD hoc network may result in the increased packet collisions among nodes which use different transmission power.
在无线自组织网数据链路层中，采用传统的功率控制机制会引起不同发射功率节点间的分组冲突。
The wireless multimedia sensor networks can transmit temperature and image data in multi-hop model with low packet error ratio.
网络能支持温度和图像数据的多跳传输，错包率低。
Then a secure architecture was given, which includes secure wireless ad hoc routing, secure packet for-warding and secure data link layer.
在总结现有安全机制的基础上，提出了一种具有攻击防御、攻击探测和攻击反应能力的移动自组网络安全架构。
The format of data packet by using wireless communication was designed, and the encode and decode of electro-handwheel pulse were analysed.
设计了通过无线传输的有效数据包格式，并对电子手轮脉冲的编码与译码进行了分析。
The format of data packet by using wireless communication was designed, and the encode and decode of electro-handwheel pulse were analysed.
设计了通过无线传输的有效数据包格式，并对电子手轮脉冲的编码与译码进行了分析。
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