| .. SPDX-License-Identifier: CC-BY-4.0 |
| .. Copyright 2023 Nordix Foundation. All rights reserved. |
| .. Copyright 2024 OpenInfra Foundation Europe. All rights reserved. |
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| Consumed APIs |
| ============= |
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| The A1 Policy Management Service consumes two ONAP APIs and the A1-P API. |
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| O-RAN A1 Interface for A1 Policies (A1-P) |
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| Southbound, the ONAP A1 Policy functions communicate with *near-RT RIC* RAN functions using the **A1** interface, as defined by the `O-RAN Alliance <https://www.o-ran.org>`_ |
| The *A1 Interface - Application Protocol Specification (A1-AP)* describes this interface. The specification can be viewed from the `O-RAN Alliance <https://www.o-ran.org>`_ website. |
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| The **Oslo** ONAP A1 Policy functions implement the *A1 Policy* (*A1-P*) parts of A1-AP, supporting versions *v1.1*, *v2.0* and *v3.0*. |
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| An opensource implementation of a `near-RT RIC <https://lf-o-ran-sc.atlassian.net/wiki/spaces/RICP/overview>`_ is available from the `O-RAN Software Community <https://o-ran-sc.org>`_. It supports a pre-spec version of the A1-AP. The ONAP A1 Policy functions described here also supports this A1 version (*A1-OSC*). |
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| An opensource implementation of an `A1 Simulator <https://lf-o-ran-sc.atlassian.net/wiki/spaces/RICNR/overview>`_ is also available from the `O-RAN Software Community <https://o-ran-sc.org>`_. It supports all versions of A1-AP. |