The present document specifies the overall stage 2 level functionality for control and user plane separation of EPC's SGW, PGW and TDF. This enables a flexible placement of the separated control plane and user plane functions for supporting diverse deployment scenarios (e.g. central or distributed user plane function) without affecting the overall functionality provided by these EPC entities.
for V14, V15:
Interface between MME and SGW-U for IoT data transmission
| Removal of PMIP-based procedures specified
| Update of the Procedures Specified in TS 23.060 for V15:
Correcting the condition for selection of SGW-U for NR as secondary RAT