B.2 Basic Prerequisite

23.3353GPPRelease 17Stage 2Technical realization and information flowsTSUser Data Convergence (UDC)

A fundamental concept of UDC is to separate a network node’s user data from a network node’s application logic.

It is understood that a network node’s application logic is running in sessions, which last for a limited duration. During a session the application logic makes use of user data, i.e. user data cannot be separated from the application logic while a session is ongoing. Only when no session is ongoing user data can be separated from the application logic.

NOTE: The terms "session" and "application" in this context have special meaning which must not be mixed up with a user’s communication session or service application.

Consequently, Network Nodes that (in non-UDC networks) do not store user data (while no session is ongoing), are not applicable to the UDC concept.

Furthermore, Network Nodes that (in non-UDC networks) do not perform application logic (i.e. pure data bases), are not applicable to the UDC concept.