Showing posts with label HSS. Show all posts
Showing posts with label HSS. Show all posts

Thursday, September 10, 2020

Interfacing HSS and UDM in 5GS with UDICOM (a.k.a NU1 / Nhss)

Back in 2012, we were talking about migration from HLR to HSS. Now we are discussing how to interface HSS to the UDM (Unified Data Management in 5G Core).


In the recent 5G World event, Richard Band, Head of 5G Core, HPE talked about 4G to 5G transition planning. During the talk he mentioned about UDICOM, which is the Standardised new interface between HSS and UDM as defined in 3GPP TS 23.632.


UDICOM allows operators to deploy separate HSS and UDM, even from different vendors. Supported features include:
  • Authentication
  • Single Registration Handover
  • IMS
  • SMS over NAS
3GPP TS 23.632 (Technical Specification Group Core Network and Terminals; User data interworking, coexistence and migration; Stage 2; Release 16) does not use the term UDICOM. It does however describe the interface details, system architecture, system procedures and network function service procedures of UDM-HSS interface.

As can be seen in the picture above, the following reference points are realized by service-based interfaces:
NU1: Reference point between the HSS and the UDM.
NU2: Reference point between the HSS and the 5GS-UDR.

The following Service based interfaces are defined for direct UDM-HSS interworking:
Nudm: Service-based interface exhibited by UDM.
Nhss: Service-based interface exhibited by HSS.

I am not going in more details here but anyone wanting to learn more about the interface should start with 3GPP TS 23.632.

Finally, this talk from HP Enterprise below provides more details of UDICOM.



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Wednesday, January 25, 2012

Introduction of HSS in the LTE

Click on the pic to enlarge

Interesting slides from E-Plus Mobilfunk GmbH & Co. KG presented in FUSECO Forum 17th-18th November 2011, Berlin.