Section: 5.3.13 Interaction between power saving mode and extended idle mode DRX cycle
Content: The UE can request the use of both PSM and eDRX during an attach or tracking area updating procedure but it is up to the network to decide to enable none, one of them or both (see 3GPP TS 23.682[ Architecture enhancements to facilitate communications with packet data networks and applications ]  [11A] and 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [10]). If the network accepts the use of both PSM (see clause 5.3.11) and eDRX (see clause 5.3.12), the extended DRX parameters IE provided to the UE should allow for multiple paging occasions before the active timer expires.