Study on security aspects for multi-access(DualSteer +Access Traffic Steering, Switch and Splitting support in the 5G system architecture phase 4 (ATSSS Ph-4)
The present document aims to address the security aspects of Multi-Access, focusing on DualSteer devices and ATSSS Phase 4 (ATSSS Ph-4) enhancements, as identified in the FS_MASSS study in TR 23.700-54 [2].
The scope of this study includes the following key areas:
- Examine the security implications of a simplified architecture over non-3GPP access, where non-3GPP access does not rely on the current TNGF/N3IWF architecture. This involves assessing:
- Whether to keep NAS security context on non-3GPP access.
- Whether to keep IPsec on the user plane and/or control plane of non-3GPP access.
- Whether new security mechanisms are to be considered in UE procedures, particularly regarding registration and connectivity to the 5G system in the context of ATSSS between 3GPP and non-3GPP access without 5G NAS.
The present document leverages insights from the requirements and architectural considerations outlined in the TR 23.700-54 [2].