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3G Evolution, 2nd Edition by Per Beming, Johan Skold, Stefan Parkvall, Erik Dahlman

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Chapter 21. System Architecture Evolution

In this chapter an overview of the System Architecture Evolution (SAE) work in 3GPP is given. Furthermore, in order to understand from where the SAE is coming from, the core network used by WCDMA/HSPA is discussed. Thus, the system architecture of WCDMA/HSPA and LTE, their connections, similarities, and differences are briefly described. The term system architecture describes the allocation of necessary functions to logical nodes and the required interfaces between the nodes. In the case of a mobile system, such as WCDMA/HSPA and LTE/SAE, most of the necessary functions for the radio interface have been described in the previous chapters. Those functions are normally called radio access network functions. ...

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