3 UDM Architecture

Connectivity Tier

• 5GNF API gateway (uses SpringCloudGateway) receives all ingress requests and forwards them to UDM micro service in Business Tier
• Runs on Kubernetes as a micro service

Business Tier

• Provides the business logic of 5G UDM
• Runs on Kubernetes and has 6 micro services
• ausfueauthenticator: Provides AUSF authentication services functionality and connects to Data Tier for DB operations
• ocudm-nudm-ue-auth-service: Provides UDM authentication functionality
• ocudm-nudm-uecm-service: Provides UDM Context Management functionality
• ocudm-nudm-sdm-service: Provides UDM Subscriber Data Management functionality
• ocudm-nudm-sdm-notify-service: Provides UDM Subscriber Data Management, Data Change notification functionality
• nudm-nrf-client-service: Supports NRF registration, heartbeat, update and de-registration with NRF

Data Tier

• Uses Oracle MySQL Cluster CGE database technology for back-end database in the DB tier, which provides HA and geo-redundcancy capabilities.
• Runs on virtual machines.

Figure 3-1 shows the detailed view of the UDM Architecture:

Figure 3-1 UDM Architecture