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。

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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。

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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。

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In addition, it will have algorithms that enable it to navigate typical wireless problems like frequent data packet loss, delays and other jitters.

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Now that wide-area wireless network operators recognize Wi-Fi hotspots as complementary to their advanced packet-data networks, they will end up owning or leasing most of today's hotspots and will build out coverage.

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The company has bought additional spectrum, deployed improved High Speed Packet Access (HSPA) software and added fiber backhaul, which carries data to wireless distribution points.

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