A method for transmitting system information from a base station (BS), the method comprising:
- transmitting a first-type system information block (SIB) to user equipment (UE), the first-type SIB comprising an identifier of a second-type SIB and a first value tag, the first value tag indicating a version of the second-type SIB and being valid in a cell or in a geographical area;
- receiving from the UE a request message for the second-type SIB;
- and
- transmitting a response message to the UE, the response message comprising the second-type SIB;
- wherein the first value tag is valid to the UE when the UE attempts to camp on the cell or when the UE is in the geographical area.