This dissertation focuses on research of 3gpp IMS network security, which includes access network security and network domain security.

本论文主要研究3gpp IMS网络的安全性，其包括接入网安全性研究和网络域安全性研究。

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IP Multimedia Subsystem (IMS) has been accepted as the core control platform of the 3g network. Its security problems are facing severe challenges now.

IP多媒体子系统(IMS)作为3g网络的核心控制平台，其安全问题正面临着严峻的挑战。

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During the process of network evolution and convergence, the security aspect of IMS is especially important.

在网络演进和融合的过程中，IMS的安全显得尤为重要。

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