Consumed APIs

The A1 Policy Management Service consumes two ONAP APIs and the A1-P API.

O-RAN A1 Interface for A1 Policies (A1-P)

Southbound, the ONAP A1 Policy functions communicate with near-RT RIC RAN functions using the A1 interface, as defined by the O-RAN Alliance The A1 Interface - Application Protocol Specification (A1-AP) describes this interface. The specification can be viewed from the O-RAN Alliance website.

The Montreal ONAP A1 Policy functions implement the A1 Policy (A1-P) parts of A1-AP, supporting versions v1.1, v2.0 and v3.0.

An opensource implementation of a near-RT RIC is available from the O-RAN Software Community. It supports a pre-spec version of the A1-AP. The ONAP A1 Policy functions described here also supports this A1 version (A1-OSC).

An opensource implementation of an A1 Simulator is also available from the O-RAN Software Community. It supports all versions of A1-AP.