1. Background
The O-RAN architecture includes a Real-Time (RT) Radio Intelligent Controller (RIC) that is connected via A1 interface to Non-Real Time RIC function that resides in the Service Management and Orchestration (SMO) layer. The purpose of A1 interface is to enable Non-RT RIC function to provide policy-based guidance, AI/ML model management, and enrichment information to the near-RT RIC for RAN optimization.
2. High-Level Architecture and Use Cases
The overall Use Case Flow (DMAAP <--> SDNR/A1 REST Adapter <--> A1 Mediator) is as follows:
- Any ONAP or micro-service that wants to perform any policy management related activity will publish a DMAAP message, with appropriate request
- DMAAP listener will consume the DMAAP message and invoke RPC against A1 Adapter
- A1 Adapter, based on the received DMAAP message/RPC, will invoke corresponding REST API's against A1 Mediator in Near-RT RIC
The picture below depicts overall use case flow
3. High-Level Design Approach
