Section: 9.2.10 Extended DRX for RRC_IDLE and RRC_INACTIVE
Content: When extended DRX (eDRX) is used, the following applies: - For RRC_INACTIVE, eDRX configuration for RAN paging is decided and configured by NG-RAN. In RRC_INACTIVE the UE monitors both RAN and CN paging; - For RRC_IDLE, eDRX for CN paging is configured by upper layers. In RRC_IDLE the UE monitors only CN paging; - Information on whether eDRX for CN paging and RAN paging is allowed on the cell is provided separately in system information; - The maximum value of the eDRX cycle is 10485.76 seconds (2.91 hours) while the minimum value of the eDRX cycle is 2.56 seconds; - The hyper SFN (H-SFN) is broadcast by the cell and increments by one when the SFN wraps around; - Paging Hyperframe (PH) refers to the H-SFN in which the UE starts monitoring paging according to DRX during a Paging Time Window (PTW). The PH and PTW are determined based on a formula (see TS 38.304[ NR; User Equipment (UE) procedures in Idle mode and in RRC Inactive state ]  [10]) that is known by the AMF, UE and NG-RAN; - H-SFN, PH and PTW are used if the eDRX cycle is greater than 10.24 seconds; - When the RRC_IDLE eDRX cycle is longer than the system information modification period, the UE verifies that stored system information remains valid before resuming/establishing an RRC connection.