CH; however, other SI mes- sages are mapped to BCCH and are dynamically carried on DL-SCH. The scheduling of SI messages is part of other SI and is signaled via SIB1. The UEs in RRC_IDLE or RRC_INACTIVE state may request other SI which would trigger a random-access proce- dure, wherein the corresponding Msg3 includes the SI request message unless the requested SI is associated with a subset of physical RACH (PRACH) resources, in that case Msgl is CMAS is a public warning system developed for the delivery of multiple, concurrent warning notifications [8]. 240 Chapter 2 used. When Msgl is used, the minimum granularity of the request is one SI message (i.e., a set of SIBs), one RACH preamble and/or PRACH resource can be used to request multiple SI messages and the gNB acknowledges the request in Msg2. When Msg3 is used, the gNB acknowledges the request in Msg4. The other SI may be broadcast at a configurable period- icity for a certain duration of time. The other SI may also be broadcast when it is requested by a UE in RRC_IDLE or RRC_INACTIVE state [8]. A UE would be allowed to camp on a cell, if it acquires the minimum SI broadcast by that cell. It must be noted that not all cells in a network broadcast the minimum SI; thus the UE would not be able to camp on those cells. The SI may be changed at the specific radio frames according to a modification period. The SI may be transmitted a number of times with the same content within the modification period defined by its scheduling. The modification period is configured by the SI. When the network parameters change (some of the SI), it first notifies the UEs about this change, that is, this may be done within a modification period. In the next modification period, the net- work transmits the updated SI. Upon receiving a change notification the UE acquires the new SI from the beginning of the next modification period. The UE applies the previously acquired SI until the UE acquires the new SI. The short message transmitted with P-RNTI via DCI on PDCCH is used to inform 