| CPC H04W 28/18 (2013.01) [H04L 5/0073 (2013.01); H04W 28/082 (2023.05)] | 20 Claims |

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1. A method performed by an E2 node, the method comprising:
transmitting, to a radio access network (RAN) intelligent controller (RIC) through an E2 interface to the RIC, a first message; and
receiving, from the RIC, a second message in response to the first message,
the first message being an E2 setup request message or a configuration update message,
wherein the first message comprises a value of message type for the first message, an identifier (ID) of the E2 node, and a list for adding one or more RAN functions,
wherein the first message further comprises configuration information for one or more serviced cells associated with the E2 node, and
wherein the one or more serviced cells comprise new radio (NR) cells or evolved universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) cells.
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