15.3.2.3 Application layer initialization

Once SCTP connectivity has been established, the NG-RAN node and its candidate peer NG-RAN node are in a position to exchange application level configuration data over XnAP needed for the two nodes to interwork correctly on the Xn interface:

• The NG-RAN node provides the relevant configuration information to the candidate NG-RAN node, which includes served cell information;
• The candidate NG-RAN node provides the relevant configuration information to the initiating NG-RAN node, which includes served cell information;
• When the application layer initialization is successfully concluded, the dynamic configuration procedure is completed and the Xn interface is operational;
• The NG-RAN node shall keep neighbouring NG-RAN nodes updated with the complete list of served cells, or, if requested by the peer NG-RAN node, by a limited list of served cells, while the Xn interface is operational.