4 Overview

29.5043GPP5G SystemRelease 18Stage 3TSUnified Data Repository Services

The Unified Data Repository (UDR) is the network entity in the 5G Core Network (5GC) supporting the following functionalities:

– Storage and retrieval of subscription data as specified in 3GPP TS 29.505 [2];

– Storage and retrieval of policy data as specified in 3GPP TS 29.519 [3];

– Storage and retrieval of structured data for exposure as specified in 3GPP TS 29.519 [3];

– Storage and retrieval of application data (including Packet Flow Descriptions (PFDs) for application detection, application request information for multiple UEs) as specified in 3GPP TS 29.519 [3];

– Subscription to notification and the notification of subscribed data changes.

– Storage and retrieval of NF-Group Id mapping data.

Figures 4-1 shows the data storage architecture for the 5GC:

Figure 4-1: Data storage architecture

The Nudr interface is used by the network functions (i.e. UDM, PCF, NEF and NRF) to access a particular set of the data stored in the UDR.

NOTE: Services offered by the UDR via the Nudr service based interface can also be consumed by the HSS as specified in 3GPP TS 23.632 clause 5.2.4.