name: GUTI
full_form: Globally Unique Temporary UE Identity
context: The GSM/GPRS, UMTS and LTE systems already use temporary subscription identifiers. For example, in a current LTE system, a Mobility Management Entity (MME) assigns an M-Temporary Mobile Subscriber Identity (M-TMSI) to a subscriber. The M-TMSI, which is local to a MME, and a MME Code (MMEC) form another identifier called an S-TMSI. The S-TMSI, which identifies a particular subscriber in a particular MME, is itself a part of an identifier called Globally Unique Temporary Identifier (GUTI). A GUTI uniquely and globally identifies a particular subscriber. The MME can allocate or reallocate a GUTI to a UE in the following messages: ATTACH ACCEPT: The MME either allocates the GUTI for the first time or optionally reallocates the GUTI depending upon if the UE sent an ATTACH REQUEST using an IMSI or an existing GUTI respectively. TRACKING AREA UPDATE ACCEPT: The MME optionally reallocates the GUTI. GUTI REALLOCATION COMMAND: The MME explicitly reallocates the GUTI. Temporary subscriber
description: Globally Unique Temporary UE Identity (GUTI) is a parameter used to uniquely and globally identify a particular subscriber in a mobile network. It is allocated or reallocated by the Mobility Management Entity (MME) to a User Equipment (UE) through specific messages such as ATTACH ACCEPT, TRACKING AREA UPDATE ACCEPT, and GUTI REALLOCATION COMMAND.
explanation: The context explicitly describes GUTI as an identifier that uniquely identifies a subscriber, which is allocated or reallocated by the MME. This indicates that GUTI serves as a critical network attribute for operation, fitting the definition of a Parameter.
section_title: 5.7.3.1.1	Key issue details
biotag_Context: O,O,B-Technology,O,B-Technology,O,O,O,O,O,O,O,O,O,O,O,B-Technology,O,O,B-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,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,O,O,B-Parameter,O,O,B-Parameter,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Parameter,O,O,B-Device,O,O,O,O,O,O,O,B-Network Function,O,O,O,B-Parameter,O,O,O,O,O,O,O,O,B-Parameter,O,O,O,O,B-Device,O,O,B-Message,I-Message,O,O,B-Parameter,O,O,O,B-Parameter,O,O,O,O,O,O,B-Network Function,O,O,O,O,B-Parameter,O,O,O,B-Network Function,O,O,O,O,O,O
biotag_Description: B-Parameter,I-Parameter,I-Parameter,I-Parameter,I-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,B-Network Function,I-Network Function,I-Network Function,O,O,O,B-Device,I-Device,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Parameter,O,O