Systems and techniques for obtaining system information in a wireless communication system include: receiving a System Information Block Type 1 (SIB1) from a first cell, the SIB1 including information for acquiring an on-demand SI; requesting the on-demand SI to the first cell; based on the on-demand SI being not received from the first cell in a first specific period of time after the requesting the on-demand SI to the first cell is successful, re-requesting the on-demand SI to the first cell; and based on the on-demand SI being not received from the first cell in a second specific period of time after a total number of requesting the on-demand SI to the first cell reaches a maximum value, re-selecting a second cell under assumption that the first cell is a barred cell.