A method for providing system information (SI) performed by a base station (BS) is provided. The method includes: broadcasting a system information block type 1 (SIB1) associated with a cell; receiving, from a user equipment (UE), a first message including a common control channel (CCCH) service data unit (SDU), the CCCH SDU including a radio resource control (RRC) SI request message; and transmitting, to the UE, a medium access control (MAC) control element (CE) including a UE contention resolution identity that matches a portion of the CCCH SDU. The MAC CE enables a MAC entity of the UE to indicate reception of an acknowledgment for the RRC SI request message to an RRC entity of the UE. The SIB1 does not include information related to a Random Access (RA) resource specific to SI requested by the RRC SI request message.