1. A method for broadcasting, by a distributed unit (DU) of a base station (BS), system information in a wireless communication system, the method comprising:receiving, from a central unit (CU) of the BS, a first message that contains a plurality of system information;
receiving, from a user equipment (UE), a second message that contains a request for the system information;
transmitting, to the CU of the BS, a third message that includes the UE's request for the system information;
receiving, from the CU of the BS, a fourth message that includes an enumerated type of the requested system information, wherein the enumerated type of the requested system information identifies the requested system information from among the plurality of system information that was received from the CU in the first message; and
broadcasting the requested system information.