name: NAS
full_form: Network Access Security Mechanism for Authentication and Integrity Check
context: The following abnormal case can be identified:
  a)        T3396 is running
  The UE shall not send an ESM DATA TRANSPORT message unless
  -        the UE is a UE configured to use AC11 â 15 in selected PLMN; or
  -        the ESM DATA TRANSPORT message is used for an exception data reporting and the UE is allowed to use exception data reporting (see the ExceptionDataReportingAllowed leaf of the NAS configuration MO in 3GPPÂ TSÂ 24.368Â [15A] or the USIM file EFNASCONFIG in 3GPPÂ TSÂ 31.102Â [17]).
  The ESM DATA TRANSPORT message can be sent, if still necessary, when timer T3396 expires or is stopped.
  b)        Transmission failure of the ESM DATA TRANSPORT message indication from lower layers
  If lower layers indicate a TAI change and the current TAI is not in the TAI list, the transport of user data via the control plane procedure shall be aborted and re-initiated after successfully performing a tracking area updating procedure if the control plane CIoT EPS optimisation is still used and the user data exists. The "signalling active" flag shall be set in the TRACKING AREA UPDATE REQUEST message.
  If lower layers indicate a TAI change, but the current TAI is still part of the TAI list, or the TAI has not changed, the transport of user data via the control plane procedure shall be re-initiated immediately if the user data still exists by including the ESM DATA TRANSPORT message in a CONTROL PLANE SERVICE REQUEST message.
  NOTE:        How the ESM sublayer handles the retransmission of user data via the control plane is up to the UE implementation.
  c)        NAS MAC calculation indication from lower layers
  If lower layers indicate to calculate an NAS MAC, the UE shall calculate an NAS MAC as specified in 3GPPÂ TSÂ 33.401Â [19] and then provide the calculated NAS MAC and 5 least significant bits of the uplink NAS COUNT used to calculate the NAS MAC to lower layers (see 3GPPÂ TSÂ 36.331Â [22]). The UE shall increase the uplink NAS COUNT by one after the calculation of the NAS MAC.
description: The NAS MAC is used to calculate authentication and integrity check values. The UE calculates an NAS MAC as specified in 3GPP TS 33.401.
explanation: NAS MAC is a Security Mechanism because it provides security features for the network access.
biotag_Context: O,O,O,O,O,O,O,O,B-Parameter,O,O,O,B-Device,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,O,B-Device,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,B-Miscellaneous,O,O,O,O,O,O,O,B-Device,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Technology,B-Network,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,I-Message,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Parameter,O,O,O,O,O,B-Parameter,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Message,I-Message,I-Message,O,O,O,B-Message,I-Message,I-Message,I-Message,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,B-Protocol,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,B-Device,O,O,O,B-Protocol,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,B-Protocol,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,B-Protocol,B-Protocol,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,B-Protocol,O
biotag_Description: O,B-Protocol,B-Protocol,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,B-Protocol,B-Protocol,O,O,O,B-Organization,B-Specification,O