Architecture for Montreal Release:

Open

ONAP: A1 Controller Architecture: London

A1 Policy components (subset of 'Non-RealTime RIC'):

• A1 Policy Management Service (In ONAP CCSDK/SDNC)
  
  

• SDNC A1 Adapter (In ONAP CCSDK/SDNC)

• Near-RT RIC / A1 Simulator (in O-RAN Source Community (OSC)) (Wiki)
  
  

• A1 Policy Management GUI / NONRTRIC Dashboard (in O-RAN Source Community (OSC)) (Wiki)

Source code & Documentation

• The source code is available in: ONAP CCSDK (O-RAN) Gerrit repo ('montreal' branch)

  • Support functions available in OSC repos: OSC A1-Simulator (Gerrit) & OSC NONRTRIC Control Panel (Gerrit)

• The Official Documentation can be found at https://docs.onap.org/projects/onap-ccsdk-oran/en/montreal/ 

• Additional Non-RealTime RIC functions are developed in the OSC NONRTRIC project - which reuses these A1 Policy components.

JIRA links

• CCSDK-3909: A1 Adapter and A1 Policy Managements Enhancements in Montreal Release – CCSDKClosed

ONAP A1 Policy Management Service (ONAP CCSDK)

The Policy Management Service is a micro service which maintains a transient repository of:

• All A1 policies instances in the network. Each policy is targeted to a near-RT-RIC instance and is owned by a 'service' (R-APP or the NONRTRIC Dashboard).

• All near-RT-RICs in the network.

• All Policy types supported by each near-RT-RIC.

The service provides :

• Unified REST API for managing A1 Policies in all near-RT-RICs.

• Synchronized view of A1 Policy instances for each rApp/Client

• Synchronized view of A1 Policy instances in each near-RT-RIC

• Synchronized view of A1 Policy types supported by each near-RT-RIC

• Lookup service to find the near-RT-RIC to control resources in the RAN as defined in  O1 (e.g. which near-RT-RIC should be accessed to control a certain CU or DU, which in turn controls a certain cell).

• Monitors all near-RT-RICs and maintains data consistency  – e.g. recovery from near-RT-RIC restarts

• Support for different Southbound APIs to the near-RT-RICs (different versions of the A1-P and other similar APIs).

• HTTPS can be configured to use a supplied certificate/private key and to validate peers towards a list of trusted CAs/certs.

• HTTP proxy support for tunneling HTTP/HTTPS connections.

• Fine-grained access-control - with new optional callouts to an external auth function

The REST API can be found at

• https://docs.onap.org/projects/onap-ccsdk-oran/en/montreal/offeredapis/pms-api.html

ONAP A1 Adapter (part of ONAP CCSDK/SDNC):

Optional mediation point for A1 interface termination in SMO/Non-RT RIC

• Implemented as OSGI Feature/Bundles

• A1 REST southbound

• NETCONF YANG Northbound

• RESTCONF > NETCONF adapter

• Mapping logic / Provider

• Can be included in an any SDNC/CCSDK persona

OSC A1 Policy Management GUI / NONRTRIC Dashboard

Graphical user interface. This tool is available in O-RAN SC and is not essential for the A1 Policies / Non-RT-RIC.

• View and Manage A1 policies in the RAN (near-RT-RICs)

• Interacts with the Policy Management Services NBI (REST API)

• Graphical A1 policy creation/editing is model-driven, based on policy type’s JSON schema

• Frontend: Angular framework

• Backend Java Springboot application

• Please refer to the OSC NONRTRIC Control Panel Documentation (Latest)

OSC Near-RT RIC Simulator / A1 Simulator:

A1 simulator used for testing purposes. This tool is available in O-RAN SC and is not essential for the A1 Policies / Non-RT-RIC.

• Used to create multiple stateful A1 providers (simulated near-RT-RICs)

• Implemented as a Java Springboot application

• Swagger-based northbound interface, so easy to change the A1 profile exposed

• Supports plugable type-specific behaviors

• Please refer to the OSC A1 Simulator Documentation (Latest)