name: T3422
full_form: Timer T3422
context: The network initiates the detach procedure by sending a DETACH REQUEST message to the UE (see example in figureÂ 5.5.2.3.1).
  NOTE:	If the MME performs a local detach, it will inform the UE with an EMM messages (e.g. SERVICE REJECT or TRACKING AREA UPDATE reject) with EMM cause #10 "implicitly detached" only when the UE initiates an EMM procedure.
  The network may include an EMM cause IE to specify the reason for the detach request. The network shall start timer T3422. If the Detach type IE indicates "re-attach required" or "re-attach not required" and the EMM cause value is not #2 "IMSI unknown in HSS", or if the MME performs a local detach, the MME shall either store the current EPS security context if it is a native EPS security context, or the MME shall delete the current EPS security context if it is a mapped EPS security context. If the detach type IE indicates "re-attach required" or "re-attach not required" and the EMM cause value is not #2 "IMSI unknown in HSS", the network shall deactivate the EPS bearer context(s), if any, for the UE locally and enter state EMM-DEREGISTERED-INITIATED.
  In NB-S1 mode or WB-S1 mode via satellite E-UTRAN access, if the network initiates the detach procedure because the network determines that the UE is in a location where the network is not allowed to operate (see 3GPPÂ TSÂ 23.401Â [10]), the network shall set the EMM cause value in the DETACH REQUEST message to #78 "PLMN not allowed to operate at the present UE location".
  If the network detach is triggered because the MME determines that, by UE subscription and operator's preferences, all of the TAIs received from the satellite E-UTRAN are forbidden for roaming or for regional provision of service, the MME shall include the TAI(s) in:
  a)	the Forbidden TAI(s) for the list of "forbidden tracking areas for roaming" IE;
  b)	the Forbidden TAI(s) for the list of "forbidden tracking areas for regional provision of service" IE; or
  c)	both,
  in the DETACH REQUEST message.
  Figure 5.5.2.3.1: Network initiated detach procedure
description: The network starts timer T3422 when initiating the detach procedure. This timer is critical for managing and controlling the detach process.
explanation: T3422 is a Timer that is used by the network to manage the detach procedure.
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