 an area referred to as the SI area, which consists of one or several cells and is identified by the systemInformationAreaID broadcasted in SIB1. Whenever the network needs to update the SI, one needs to ensure that both the net- work and the UE apply the updated information roughly at a same time. This is ensured SO that the UE is informed about the SI change prior to the actual change of information and the updated SI is broadcasted in the modification period following the one where the SI change indication is transmitted. Nevertheless, due to nature of the information of the PWS SIBs, the update mechanism has to be faster, and thus the UE needs to immediately acquire any PWS information whenever it is indicated as changed. The UE receives indications about SI modifications and PWS modifications using Short Message transmitted with P-RNTI over DCI. A UE in RRC_IDLE or in RRC_INACTIVE shall monitor for SI change indication in its own paging occasion every DRX cycle. A UE in RRC_CONNECTED shall monitor for SI change indication in any paging occasion at least once per modification period if the UE is provided with a common search space to monitor paging. Otherwise, the network needs to update the SI by dedicated signaling for the UE in RRC_CONNECTED. An ETWS- or CMAS-capable UE in RRC_IDLE or in RRC_INACTIVE shall monitor for indications about PWS notification in its own paging occasion every DRX cycle. 7 5G Radio Protocols An ETWS- or CMAS-capable UE in RRC_CONNECTED shall monitor for indication about PWS notification in any paging occasion at least once per modification period if the UE is provided with common search space to monitor paging. When the relevant SI for the SCell is changed, the RAN releases and adds the con- cerned SCell. For the PSCell, SI can only be changed with Reconfiguration with Sync. 7.7.3 Paging The main purpose of the paging message is to page a UE in the RRC_IDLE and RRC_INACTIVE mode for a mobile-terminated call. In addition, the UE may be informed about SI changes by the paging short m