The 4th generation mobile communication system certainly will have a lot of improvement such as supporting higher multimedia loading, faster transmission rate, and implementation of IP, the future service of the network will definitely convey into an All-IP network. To allow people to better perform their daily living activities, improve the quality of life, and enjoy entertainment and leisure activities. In this paper, we proposed our system. This system is build upon a new technology of a 4G network. The user authentication in heterogeneous network, the key generation, and data encryption, that later merged together into a cross layer network for smart living space. This technology can develop a smart and convenience of living.
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