This TS defines the Stage 2 service description for the Evolved Packet System (EPS).
The specification covers both roaming and non-roaming scenarios and covers all aspects, including mobility between E-UTRAN and pre-E-UTRAN 3GPP radio access technologies, policy control and charging, and authentication.
For a better understanding of the contents of this fundamental specification,
all the figures (119) have been reproduced within the following ToC.
This is also the case for: