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IP Design for Mobile Networks by Scott Wainner, Kevin Shatzkamer, Mark Grayson

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Chapter 6. Mobile Core Evolution

The role of access networks, as described in Chapters 2 and 3, is to provide simple connectivity to the core network—whether this is a Circuit-Switched Core Network (originally called the Network-Switching Subsystem by GSM) or a Packet-Switched Core Network.

As its name suggests, the Circuit-Switched Core Network provides access to Circuit-Switched (CS) services, including voice, SMS, and CS data. The Circuit-Switched Core is defined for legacy cellular systems, including GSM Edge Radio Access Network (GERAN), UMTS Terrestrial Radio Access Network (UTRAN), and the cdma2000 1xRTT Radio Access Network.

The Packet-Switched Core provides access to IP-based services. The exact composition of the Packet-Switched Core ...

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