Method and apparatus for requesting SIB in wireless communication system

A user equipment (UE) for requesting a system information block (SIB) in a wireless communication system, the UE comprising:

• a memory;
• a transceiver;
• and
• a processor functionally in communication with the memory and the transceiver,
• wherein the processor is configured to:
• control the transceiver to receive an SIB list comprising one or more SIBs supported by a cell from a radio access network (RAN);
• control the transceiver to receive, from the RAN, SIB broadcast information informing the UE whether an SIB supported by the cell is broadcast in a broadcast control channel (BCCH) period;
• detect a missing SIB based on the SIB list and the SIB broadcast information;
• and
• control the transceiver to request the missing SIB from the RAN,
• wherein the missing SIB is an SIB that is not broadcast in the BCCH period among the SIBs comprised in the SIB list.