# <center>General workflow on E2 interface</center>

A general workflow to be followed between the near-RT RIC and E2 node appears in Figure 1.

<center>Figure 1. The E2 interface and near-RT RIC use a series of handshakes to execute functions.</center>

# RIC services

Near-RT RIC may use the following RIC services provided by an E2 node:
- REPORT: Near-RT RIC uses a RIC Subscription and/or RIC Subscription Modification procedures to request that E2 Node sends a REPORT message to Near-RT RIC and the associated procedure continues in the E2 Node after each occurrence of a defined RIC Subscription procedure Event Trigger.
- INSERT: Near-RT RIC uses a RIC Subscription and/or RIC Subscription Modification procedures to request that E2 Node sends an INSERT message to Near-RT RIC and suspends the associated procedure in the E2 Node after each occurrence of a defined RIC Subscription procedure Event Trigger.
- CONTROL: Near-RT RIC sends a CONTROL message to E2 Node to initiate a new associated procedure or resume a previously suspended associated procedure in the E2 Node.
- POLICY: Near-RT RIC uses a RIC Subscription and/or RIC Subscription Modification procedures to request that E2 Node executes a specific POLICY during functioning of the E2 Node after each occurrence of a defined RIC Subscription procedure Event Trigger.
- QUERY: Near-RT RIC sends a QUERY message to the E2 node to retrieve RAN-related and/or UE-related information from the E2 Node.

## REPORT Service

## INSERT service

## CONTROL service

# E2 support services

The E2 support services are supported by the following global procedures:
- E2 Setup
- E2 Reset
- RIC Service Update
- E2 Node Configuration Update
- E2 Removal
- Reporting of General Error Situations

## E2 Setup procedure

## RIC Service Update procedure

## E2 Node Configuration Update procedure

# E2AP Message
<center>Figure 2. E2AP procedures include RIC request ID, RAN Function ID, and RIC subscription details.</center>