The objective of this study is to enhance the common 5G core network defined in TS 23.501 and TS 23.502 in order to support wireline access networks and Trusted N3GPP. The key areas of the investigation are:

• Support of wireline access networks:
  • Definition of the 5G Core network (5GC) with respect to wireline access functional split;
  • Investigation on whether enhancements are needed to interfaces (e.g. N1, N2 and N3) used to connect wireline customer devices (CPE/Residential Gateway) and wireline access network to the converged 5GC;
  • Study the impact of the common framework for authentication and security, policy and QoS, Network Slicing and investigation on whether enhancements are needed;
  • Study on how to support CPE/Residential Gateway (RG) capable of connecting via wireline and/or wireless access to the 5G CN;
  • Study on how to support end user devices, with or without UICC, connected to the convergent 5GC from behind a CPE/RG;
  • Identification of the impacts on mobility, session management and interaction with Access Traffic Steering, Switching and Splitting for UEs accessing the 5G convergent network studied in TR 23.793 and investigation on whether enhancements are needed;
  • Study on how to support CPE/RG capable of connecting simultaneously via both NG RAN and wireline access to 5GC.
• Definition of architecture for the Trusted N3GPP scenario applicable not only to wireline accesses.
• Support of Trusted access networks:
  • Requirements for the Trusted Non-3GPP access in 5G system;
  • Architecture definition for the Trusted Non-3GPP access in 5G System;
  • Investigation on whether enhancements are needed to interfaces (e.g. N1, N2 and N3) used to connect the trusted non-3GPP access network to converged 5GC;
  • study the impact of the common framework for authentication and security, policy and QoS, Network Slicing and investigation on whether enhancements are needed.

This study will follow the high level principles, agreements, and conclusions of the normative work agreed in TS 22.261, TS 23.501 and TS 23.502. The study will take into account information provided by the BBF on wireless and wireline convergence.

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

• References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.