name: T3324
full_form: Timer T3324
context: The UE can request the use of power saving mode (PSM) during an attach or tracking area updating procedure (see 3GPPÂ TSÂ 23.682Â [11A] and 3GPPÂ TSÂ 23.401Â [10]). The UE shall not request the use of PSM during:
  -	an attach for emergency bearer services procedure;
  -	an attach procedure for initiating a PDN connection for emergency bearer services with attach type not set to "EPS emergency attach";
  -	a tracking area updating procedure for initiating a PDN connection for emergency bearer services;
  -	a tracking area updating procedure when the UE has a PDN connection established for emergency bearer services; or
  -	an attach for access to RLOS.
  The network accepts the use of PSM by providing a specific value for timer T3324 when accepting the attach or tracking area updating procedure. The UE may use PSM only if the network has provided the T3324 value IE during the last attach or tracking area updating procedure with a value different from "deactivated".
  NOTE:	Timer T3324 is specified in 3GPPÂ TSÂ 24.008Â [13].
  Upon expiry of the timer T3324 or if the T3324 value provided by the network is zero, the UE may deactivate the AS layer and activate PSM by entering the state EMM-REGISTERED.NO-CELL-AVAILABLE if:
  a)	the UE is not attached for emergency bearer services;
  b)	the UE has no PDN connection for emergency bearer services;
  c)	the UE is in EMM-IDLE mode;
  d)	in the EMM-REGISTERED.NORMAL-SERVICE state; and
  e)	the UE is not attached for access to RLOS.
  If conditions a, b, c and e are fulfilled, but the UE is in a state other than EMM-REGISTERED.NORMAL-SERVICE when timer T3324 expires, the UE may activate PSM when the MS returns to state EMM-REGISTERED.NORMAL-SERVICE.
  A UE that has already been allocated timer T3324 with a value different from "deactivated" and the timer T3324 has expired, may activate PSM if it receives an "Extended wait time" from lower layers.
  When PSM is activated all NAS timers are stopped and associated procedures aborted except for T3412, T3346, T3396, T3447, any backoff timers, and the timer T controlling the periodic search for HPLMN or EHPLMN (if the EHPLMN list is present) or higher prioritized PLMNs (see 3GPPÂ TSÂ 23.122Â [6]).
  If the UE is attached for emergency bearer services or has a PDN connection for emergency bearer services, the UE shall not activate PSM.
  If the UE is attached for access to RLOS, the UE shall not activate PSM.
  The UE may deactivate PSM and activate the AS layer at any time. Upon deactivating PSM, the UE may initiate EMM procedures (e.g. for the transfer of mobile originated signalling or user data).
description: Timer T3324 is specified in 3GPP TS 24.008, which determines when the UE can activate or deactivate Power Saving Mode.
explanation: Categorized as a Timer since it manages time intervals for PSM activation/deactivation.
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