 will occur at the next modification period boundary. If the UE in RRC_CONNECTED during a modification period receives one paging message, it may assume from the presence/absence of system information modification whether a change of system information other than ETWS information will occur in the next modification period. The UE performs the system information acquisition procedure (shown in Figure 4-29) to acquire the access stratum and non-access stratum system information that is broadcast by E-UTRAN. The procedure applies to UEs in RRC_IDLE and in RRC_CONNECTED. The UE applies the system information acquisition procedure on cell selection and re-selection, after handover completion, after entering E-UTRA from another RAT, on return from out-of-coverage condition, on receiving a noti- fication that the system information has changed, on receiving an indication about the presence of an ETWS notification, on receiving a request from cdma2000 upper layers, and on exceeding the maximum validity duration. The system information acquisition procedure overwrites any stored system information. If the UE is in RRC_IDLE state, it must ensure it has a valid version of the Master Information Block and System Information Block Type 1, as well as System Information Block Type 2 through System Information Block Type 8, depending on support of the other radio access technologies. If the UE is in RRC_CONNECTED state, it must ensure possession of the Master Information Block, System Information Block Type 1, and System Information Block Type 2, as well as System Information Block Type 8, depending on support of cdma2000 [18]. In 3GPP LTE, the system information is classified into five categories as follows: (1) information valid across multiple cells; (2) information needed at cell search; (3) information needed prior to cell camping; (4) information needed before cell access; and (5) information needed while camping on a cell. From the UE perspective, the information that is needed at cell selection and prior to camping E-UTR