1. Cloud Native Unified Data Repository User's Guide
  2. Overview

1 Overview

The 5G Unified Data Repository (UDR) is one of the main key component of the 5G Service Based Architecture. UDR is a converged repository, which is used by 5G Network Functions to store the data.

Oracle 5G UDR is implemented as cloud native function and it offers a unified database for storing application, subscription, authentication, service authorization, policy data, session binding and Application state information. It exposes a HTTP2 based RESTful API for NF's and provisioning clients to access the stored data.

Oracle's 5G UDR:
  • Leverages a common Oracle Communications Cloud Native Framework
  • Is compliant to 3GPP Release 15 specification UDM
  • Is compliant to 3GPP v29.519 v16.2 (backward compatible with v15.3.0, by configuration) specification for PCF
  • Has tiered architecture providing separation between the connectivity, business logic and data layers
  • Uses Oracle MySQL Cluster CGE backend database provides through DB Tier.
  • Registers with NRF in the 5G network, so the other NFs in the network can discover UDR through NRF.
As per 3GPP, UDR supports following functionality:
  • Storage and retrieval of subscription data by the UDM.
  • Storage and retrieval of policy data by the PCF.
  • Storage and retrieval of structured data for exposure.
  • Storage and retrieval of SLF information, consumed by NRF.
  • Application data (including Packet Flow Descriptions (PFDs) for application detection, AF request information for multiple UEs), by the NEF.
  • Subscription and Notification feature.
Oracle's 5G UDR provides Unstructured Data Storage Function (UDSF) functionality. This functionality:
  • Supports storage and retrieval of unstructured data by any 5G NF. The specifications of UDSF are presently not defined by 3GPP completely.
  • This functionality is part of Oracle's 5G UDR solution.
Oracle's 5G UDR provides 5G SLF functionality. This functionality:
  • Supports Nudr-groupid-map service as defined by 3GPP
  • Complaint with 3GPP Release 16 for APIs to be consumed by 5G NRF
  • Supports REST/JSON based provisioning APIs for SLF data

Architecture

The Cloud Native Unified Data Repository architecture has following three tiers:

Connectivity Tier
  • Ingress API Gateway (Spring Cloud Gateway [SCG] based) is used as an API gateway that receives all requests and forwards them to the Nudr-drservice service of Business Tier.
  • It load balances the traffic and provides required authentication.
  • It provides TLS support.
Business Tier
  • Provides the business logic of 5G Unified Data Repository.
  • It has following three micro services:
    • nudr-drservice: The core service that handles flexible URI support, runtime schema validation and connects to Data Tier for DB operations. It provides SLF lookup functionality.
    • nudr-nrf-client-service: Handles registration, heartbeat, update and deregistration with Network Repository Function (NRF).
    • nudr-notify-service: Handles notification messages to Policy Control Function (PCF) and Unified Data Management (UDM) for data subscriptions.
Data Tier
  • Uses Oracle MySQL NDB Cluster, CGE edition as backend database in the DB tier. This provides HA and geo-redundcancy capabilities.

Unified Data Repository Features

This section provides list of the features supported in Oracle Communications Unified Data Repository.

  • Flexible URI support: A user can define a new URI for any resource at runtime for basic CRUD operations on the resource.
  • Supports multi-keys: UDR supports multiple keys for a subscriber and provides flexibility to define new ones.
  • Runtime schema validation: Allows users to modify and validate the schema in use for data storage without service restart.
  • Supports5G PCF's AM, SM, UEPolicySet and UsageMonitoring data APIs. It is also compliant with 3gpp spec v29.519, v16.2 (backward compatible with v15.3.0). See Rollback to v15.3.0 version of PCF Data
  • Provisioning support via REST/JSON: UDR provides provisioning APIs for creating subscribers and adding PCF data.
  • Schema versioning: Using this feature, UDR maintains different versions of schema, starting from default version v0 (software version shipped to customers) and as customer upgrades schema, it creates new versions like v0, v1, v2.
  • Subscription/Notification feature: The "nudr-drservice" service receives and processes the subscription request to subscribe the subscriber's resources. Whenever it receives any update or delete request for subscribers (subscribed for notifications), the "nudr-drservice" service sends an internal signal (HTTP2 POST request) to "nudr-notify-service". The "nudr-notify-service" is a new service, which is responsible to send out the notification requests to the target.
  • Cross-reference validation of Sm data: Using this feature, cross-reference validation of Sm data is done before storing the Sm data in the database. This means that the values of SNSSAI/DNN and LimitIds should be same in "smPolicySnssaiData" and "umData".
  • UDSF API support: UDR supports basic CRUD operations for UDSF API.
  • UDM API support: UDR is compliant with 3GPP spec 29.505 v15.4.0. It supports encryption of stored data for certain types of UDM data.
  • Integrated with CNE services: Like Prometheus/Grafana for metrics, EFK/Kibana for logging and Jaeger for tracing
  • Flexible URI support: UDR allows you to define a new URI for any resource at runtime for basic CRUD operations on the resource.
  • Supports multi-keys: Supports multiple keys for a subscriber and provides flexibility to define new ones.
  • Runtime schema validation: UDR allows you to modify and validate schema for the data stored without any service restart.
  • Utilizes the DB Tier (MySQL NDB Cluster)'s encryption technology
  • 5G SLF functionality: UDR provides Nudr-groupid-map service towards 5G NRF. It is compliant with 3GPP release 16, spec 29.504 v16.2.0
  • Supports TLS with Ingress API gateway.
  • Integrated with ProvGwy for receiving provisioning updates to UDR. See ProvGwy documentation
  • Integrated with CNC-C for manual subscriber provisioning on the GUI.

List of Operations Supported

Unified Data Repository supports the following operations.

Subscriber Profile Related Operations for Provisioning
  • Create Subscriber: Provisions a subscriber with the given set of keys.
  • Update Subscriber: Updates the subscriber information.
  • Get subscriber: Retrieves the subscriber information completely.
  • Delete Subscriber: Deletes the subscriber information and related data.
  • Subscription Request: Subscribes to a subscriber's resources and get notified in case of updates.
  • Notification: UDR generates notification when there are updates to subscriber's resources, subscribed in previous request. These notifications are sent to notification URI received in subscription request.
NF Data Related Operations as per 3GPP
  • Insert Data: Creates a subscriber if not present and inserts the specific data (policy_data/udsf_data/udm_data/SLF Data).
  • Update Data: Creates a subscriber if not present and updates the complete data for a particular subscriber as given in request.
  • Patch Data: Supports patch update of a specific data or parts of it. If not present, it adds the data. This operation is valid only when subscriber is already present.
  • Get Data: Retrieves the requested data for a particular subscriber.
  • Delete Data: Deletes the requested data for a particular subscriber.

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