Section: 4.7.2.10 Extended idle-mode DRX cycle
Content: The MS can request the use of extended idle mode DRX cycle (eDRX) during an attach or routing area updating procedure by including the extended DRX parameters IE (see 3GPP TS 23.682[ Architecture enhancements to facilitate communications with packet data networks and applications ]  [11A] and 3GPP TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [74]). The MS shall not request the use of eDRX during: - an attach for emergency bearer services procedure; or - a routing area updating procedure for the MS attached for emergency bearer services. The MS and the network may negotiate eDRX parameters during a routing area updating procedure when the MS has a PDP context for emergency bearer services. The network accepts the request to use eDRX by providing the extended DRX parameters IE when accepting the attach or the routing area updating procedure. The MS shall use extended idle mode DRX cycle only if it received the extended DRX parameters IE during the last attach or routing area updating procedure and the MS does not have a PDP context for emergency bearer services. NOTE: If the MS wants to keep using eDRX, the MS includes the extended DRX parameters IE in each attach or routing area updating procedure. If the MS received the extended DRX parameters IE during the last attach or routing area updating procedure, upon the successful completion of the PDP context deactivation procedure for a PDP context for emergency bearer services, the MS shall resume eDRX. If the network has provided the extended DRX parameters IE during the last attach or routing area updating procedure, upon the successful completion of the PDP context deactivation procedure for a PDP context for emergency bearer services, the network shall resume eDRX. If the MS or the network locally deactivates the PDP context for emergency bearer service, the MS or the network shall not use eDRX until the MS receives eDRX parameters during a routing area updating procedure with PDP context synchronization or upon successful completion of a service request procedure. If the MS did not receive the extended DRX parameters IE, or if the MS has a PDP context for emergency bearer services, the MS shall use the stored DRX parameters, if available. If the network did not accept the request to use eDRX, or if the MS has a PDP context for emergency bearer services, the network shall use the stored DRX parameters, if available.