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EPC and 4G Packet Networks, 2nd Edition by Catherine Mulligan, Magnus Olsson

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Chapter 9

Selection Functions

9.1 Architecture Overview for Selection Functions

EPS is an all-IP-based system, and thus naturally uses DNS-based mechanisms as well as other IETF-defined node discovery mechanisms in order to find appropriate network entities within and among operators’ networks. Even though it is based on IP and Internet-driven technology, EPS has specific requirements stemming from existing GPRS networks deployed today as well as the specific nature of the networks the operators manage and share resources with, and the type of services they render. In addition, the nature of the 3GPP Packet Core Network Selection Functions is also very much dictated by the fundamental principles of mobility, roaming and security, and whether the ...

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