 in the next radio frame for which SFN mod T= FLOOR (x/10) where T is the si-Periodicity of the concerned SI message Figure 7.18 Acquisition of SI message. 7.7 The RRC Protocol whether one or more SIBs are only provided on demand and, in that case, the configu- ration needed by the UE to perform the SI request. SIB1 is a cell-specific SIB. includes reselection information common intra- frequency, inter-frequency, and/ or inter-RAT cell reselection. SIB3 includes neighboring-cell-related information relevant only for intra-frequency cell reselection. The IE includes cells with specific reselection parameters as well as blacklisted cells. SIB4 includes information relevant only for inter-frequency cell reselection, that is, information about other NR frequencies and inter-frequency neighboring cells relevant for cell reselection. SIB5 includes information relevant only for inter-RAT cell reselection, that is, infor- mation about E-UTRA frequencies and E-UTRAs neighboring cells relevant for cell reselection. SIB6, SIB7, and SIB8 contain an Earthquake and Tsunami Warning System (ETWS) primary notification, ETWS secondary notification, and Commercial Mobile Alert System (CMAS) notification, respectively. Commonly these are referred as the PWS and can be used to warn users about disaster situations, for example, earthquakes and tsunamis. SIB9 contains information related to GPS time and Coordinated Universal Time (UTC). The UE may use the parameters provided in this SIB to obtain the UTC, GPS, and local time. 7.7.2.1 Validity and Change of System Information The UE may use a stored version of the system information for PCell except the MIB and SIB1; for example, after cell reselection, upon return from out of coverage or after the reception of SI change indication. Any SIB except SIB1 can be configured to be cell specific or area specific, using an indication in the SIB1 scheduling information. The cell-specific SIB is applicable only within a cell that provides the SIB, while the area-specific SIB is applicable within