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SIB Change/SIB Change Notification

3GPP 25.331 8.1.1.5 describes all the possible situations how SIB change should be notified and recognized by UE.

The most common case of SIB change detection on UE side would be as follows :

If ( he value tag in the master information block

       is different from the value tag stored for this cell and this PLMN in the variable VALUE_TAG ) {

• store the value tag into the variable VALUE_TAG for the master information block;
• read and store scheduling information included in the master information block

}

 

If ( no IEs for the master information block are stored) {

• store the value tag into the variable VALUE_TAG for the master information block;
• read and store scheduling information included in the master information block

}

 

If ( he value tag in the master information block

       is same as the value tag stored for this cell and this PLMN in the variable VALUE_TAG ) {

• store the value tag into the variable VALUE_TAG for the master information block;
• read and store scheduling information included in the master information block

}