+.. Copyright (C) 2021-2023 Nordix Foundation
+.. Copyright (C) 2024: OpenInfra Foundation Europe. All rights reserved.
+
+O-RAN A1 Interface
+~~~~~~~~~~~~~~~~~~
+
+The O-RAN Alliance defines a new management interface "A1" for Radio Access Network (RAN) Management. This interface interconnects a new logical
+"Non-RealTime RAN Intelligent Controller (Non-RT-RIC)" function in the Service Management & Orchestration (SMO) layer with a new logical "Near-RealTime
+RAN Intelligent Controller (near-RT-RIC)" function in the RAN. This new A1 interface allows the Non-RT-RIC to provide Policy Guidance to the RAN (near-RT-RIC)
+to steer its operation. These policies are defined by the O-RAN Alliance as "A1 Policies". The specifications for the A1 Interface, including A1 Policy support,
+can be found on the O-RAN Alliance Specifications website.
+
+The A1 Policy functions are Orchestration and Automation functions for non-real-time intelligent management of RAN functions. The primary goal of the A1 Policy
+functions is to support non-real-time radio resource management, higher layer procedure optimization, policy optimization in RAN, and providing guidance,
+parameters, policies and AI/ML models to support the operation of Near-RealTime RIC (RAN Intelligent Controller) functions in the RAN to achieve
+higher-level non-real-time objectives.
+
+A1 Policy functions form part of a Non-Realtime RIC as defined by O-RAN Alliance. Non-Realtime RIC functions include service and policy management, RAN analytics,
+and model-training for the Near-RealTime RICs. The ONAP & O-RAN-SC A1 Policy work provides concepts, specifications, architecture and reference implementations
+for A1 Policy support as defined and described in the O-RAN architecture.