to the high-mo- bility state. If the criteria for medium-mobility state is detected, the UE must transition to medium-- mobility state. If criteria for either medium- or high-mobility state is not detected during time period TCRmaxHyst, the UE must transition to normal-mobility state. If the UE is in high- or medium-mobility state, it must apply the speed-dependent scaling rules [12]. 2.5.3 Paging Paging allows the network to reach UEs in RRC_IDLE and RRC_INACTIVE states, and to notify the UEs in RRC_IDLE, RRC_INACTIVE, and RRC_CONNECTED states of SI change, as well as to send ETWS/CMAS notifications. While in RRC_IDLE state, the UE monitors the PCHs for CN-initiated paging. The UEs in RRC_INACTIVE state also monitor PCHs for RAN-initiated paging. To ensure limiting the adverse impact of pag- ing procedure on the battery consumption, a UE does not need to continuously monitor the PCHs since NR defines a UE-specific paging DRX. The UE in RRC_IDLE or RRC_INACTIVE state is only required to monitor PCHs during paging occasions in a DRX cycle. The paging DRX cycles are configured by the network as follows [8]. For CN-initiated paging, a default cycle is broadcast in SI and also a UE-specific cycle is configured via NAS signaling. For RAN-initiated paging, a UE-specific cycle is config- ured via RRC signaling. The UE applies the shortest of the DRX cycles that are config- ured for it, that is, a UE in RRC_IDLE uses the shortest of the CN-initiated paging cycles, whereas a UE in RRC_INACTIVE applies the shortest of CN-initiated and RAN- initiated paging cycles (see Fig. 2.29). New Radio Access Layer 2/3 Aspects and System Operation 269 Paging frame Paging frame in for UE with idle-mode DRX UE_IDx cycle TDRX: DRX cycle Paging occasion Paging occasion for UE with in each paging UE_IDx frame Figure 2.29 Example illustration of NR paging frames and paging occasions [12]. In CN-initiated and RAN-initiated paging, the POs of a UE are based on the same UE_ID, resulting in overlapping POs for both cases. The number of different