5G System - Phase 1 CT WG4 Aspects
The present document analyses the CT4 aspects of the 5G System (5GS) – Phase 1, based on the service requirements defined in 3GPP TS 22.261 [5], the stage 2 system architecture requirements defined in 3GPP TS 23.501 [2] and the stage 2 procedures and flows defined in 3GPP TS 23.502 [3].
These CT4 aspects include the study and selection of the protocols and the definition of the procedures and services that will be used in the 5GS, including:
- the protocol and procedures for User Plane interfaces;
- the protocols, procedures and services for Control Plane interfaces (excluding PCC interfaces);
- the User Plane management procedures over N4;
- the interworking with E-UTRAN connected to EPC;
- specific services in the 5GS (SMS, PWS, LCS, IMS, Emergency Services, MPS, PEI checking);
- numbering, addressing and identification in the 5GS;
- subscriber data in 5GS;
- Network slicing impacts;
- Impacts due to Virtualization.
The present document also helps assessing the appropriate CT4 specifications structure for documenting the CT4 impacts for the 5GS. It is used as a place holder for CT4 5GS materials to be moved to appropriate 3GPP technical specifications when the TR is sufficiently stable.
SA2 or SA3 status is added as a note when unstable topics in SA2 or SA3 are described in this document.