E-UTRAN结构，也就是指E-UTRAN的逻辑节点和节点之间的接口，作为无线网络层的一部分被定义。

The E-UTRAN architecture, i. e. the E-UTRAN logical nodes and interfaces between them, are defined as part of the Radio Network Layer.

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另外，本方案采用三层密钥结构进一步增强了无线网络的安全性，实现了安全快速的漫游。

In addition, the solution has enhanced wireless network security by using three-level key structures and achieves a secure fast roaming.

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本文通过对ON/OFF 模型和WWW 业务流的分析得到一个与实际无线网络更吻合的三层业务模型，并且在OPNET 上完成UMTS 单蜂窝仿真平台的搭建。

This paper proposes a three-layer traffic model from analyzing the ON/OFF model and the WWW traffic stream that fit actual wireless traffic better, and build a single cell UMTS simulation plat.

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