Content for  TS 33.127  Word version:  16.4.0

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A  5G LI network topology viewsWord‑p. 80

A.1  Non-roaming scenario

A.1.1  General

In a non-roaming scenario, the POIs present in the following NFs provide the LI functions:
  • AMF.
  • UDM.
  • SMF.
  • UPF.
  • SMSF.
For the interception of PDU sessions, the EPC CUPS LI model is not extended to 5G where SMF and UPF are involved in delivering the xIRI and xCC associated with the PDU sessions.

A.1.2  Service-based representation with point-to-point LI system

The overall network configuration for 5G in a non-roaming scenario with the LI aspects is shown in figure A.1-1 using the service-based representation (as shown in TS 23.501) with the use of point-to-point LI system.
[not reproduced yet]
Figure A.1-1: Network topology showing LI for 5G (service-based representation) with point-to-point LI system
Figure A.1-1 shows the network topology of 5G system in a service-based representation, however, all the LI-related interfaces remain to be point-to-point.
The IRI-POIs present in the AMF, UDM SMF and SMSF deliver the xIRI to the MDF2 and CC-POI present in the UPF delivers the xCC to the MDF3. The MDF3 address to CC-POI present in UPF is provided by the CC-TF present in the SMF over LI_T3 reference point.
The LIPF present in the ADMF provisions the IRI-POIs present in the NFs with the intercept related data. The LI_X1 interfaces between the LIPF and the UPF is to monitor the user plane data.

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