| CPC H04W 72/20 (2023.01) [H04W 4/50 (2018.02); H04W 88/12 (2013.01); H04W 88/18 (2013.01)] | 18 Claims |

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1. A method for an apparatus configured to use an interface between a radio access network intelligent controller (RIC) and a E2 node including a base station in a radio access network, the method comprising:
generating information related with an RIC service;
generating value indicating a type of a message to be used for transmitting the information; and
transmitting an E2 message comprising the information and the value,
wherein,
in case that the value indicates a first type, the E2 message includes a predetermined information element fields included in a predefined message format,
in case that the value indicates a second type, the E2 message includes at least a part of the predetermined information element fields included in the predefined message format and at least one additional field in a message format defined by an operator,
wherein the value belongs to either a first ran e or a se d range and
wherein a value indicating the first type belongs to a first range comprising values indicating the predefined message format, and a value indicating the second type belongs to a second range comprising values indicating the message format defined by the operator.
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