ds fake paging messages with false IMSIs. The paging cycle, which is the periodicity with which the UE needs to monitor a PO, can be configured to be common for all UEs in a cell, or the network can configure an NAS-level UE-specific paging cycle used in RRC_IDLE as well as for RAN paging; that is, paging in an RRC_INACTIVE network can use a UE-specific paging cycle configura- tion. The UE will follow always the shortest among the paging cycles configured for it, regardless of whether it arrives via dedicated or broadcast signaling. This ensures that it is possible to reach the UE regardless of the initiating entity for paging. 7.7 The RRC Protocol The PF is calculated quite similarly as in LTE, but in addition one can configure the PF to align to RMSI transmissions. In this way, it is possible to minimize UE and net- work power consumption, or alternatively, in a capacity-limited system, the network may want to un-align POs SO as not to collide with RMSI occasions to increase capacity for a paging message. In NR, UE_ID is used to distribute UEs between different POs of the PF - somewhat similarly as in LTE. Though a PO associated with a PF does not need to occur in the same radio frame the PF started in, it should occur before the next possible PF of any UE. The actual slot determination of the PF is a little different compared to LTE - first, in LTE we had fixed subframes within radio frames that could be used for paging. But in NR, the TDD UL/DL slot configuration is very flexible, and we cannot used fixed subframes as in LTE. Possible PDCCH monitoring occasions for paging are determined according to paging search space [4]. If the paging search space equals search space zero, then the configu- ration is called default association, otherwise it is called non-default association. A PO lasts for the length of the beam sweep (i.e. for as many PDCCH monitoring occasions as there are transmitted SSBs in the cell). In the case of default association, the PDCCH monitoring occasions for paging are the same as for RMSI